Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
impression materials in dentistry specially those used in Prosthodontics.
Impression compound
Zinc oxide Eugenol impression paste
Alginate
Agar-agar
Elastomeric impression compounds like Polysulfides, Condensation silicones, Addition silicones(PVS), Polyether
detailed description with properties, mixing time, working time, setting time ,physical and properties etc
hydrocolloid impression materials, agar and alginate impression materials and properties of the same.
watch more
https://youtu.be/aaJ6gpQohcs
https://youtu.be/REMKSUty0cE
https://youtu.be/fv3_tWZPJIU
https://youtu.be/GeZIbCwqKYU
if you want me to make any ppt on any more topic do let me know on my youtube channel's comment section
This document discusses impression materials, beginning with definitions of key terms like impression, primary impression, secondary impression, cast, die, and tray. It covers the indications, requirements, and classification of impression materials. Specific materials discussed include impression compound, zinc oxide eugenol, and hydrocolloids. Hydrocolloids exist in sol and gel states and undergo an irreversible chemical reaction, examples being alginate which is used for making primary impressions, and agar.
This document discusses various die materials used for fixed prosthodontics. It begins by defining key terms like die and cast. It then describes the most commonly used die materials like gypsum products (dental stones), die stones, epoxy resins, and others. For each material, it covers properties, advantages, disadvantages and appropriate uses. It also discusses techniques to improve die properties and compatibility with different impression materials. Finally, it provides a comparison of different die materials in terms of their strengths and limitations. The overall document serves as a comprehensive guide to selecting and using die materials for fixed prosthodontic procedures.
Recent advances in dental materials/dental crown &bridge course by Indian den...Indian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
There have been several changes since inception in the field of dental ceramics. Need for newer materials with improved aesthetics, flexural strength and optical properties made it necessary for introduction of advanced technology in fabrication of dental ceramics.
This document provides information on wax patterns for dental restorations. It discusses the types and properties of dental waxes used for wax patterns, including composition, flow properties and ideal requirements. It also describes techniques for fabricating wax patterns, including additive and subtractive methods, developing axial contours and occlusal morphology, and finishing margins. The goal of the wax pattern is to define the final shape and size of the dental restoration that will be produced using the lost wax casting technique.
impression materials in dentistry specially those used in Prosthodontics.
Impression compound
Zinc oxide Eugenol impression paste
Alginate
Agar-agar
Elastomeric impression compounds like Polysulfides, Condensation silicones, Addition silicones(PVS), Polyether
detailed description with properties, mixing time, working time, setting time ,physical and properties etc
hydrocolloid impression materials, agar and alginate impression materials and properties of the same.
watch more
https://youtu.be/aaJ6gpQohcs
https://youtu.be/REMKSUty0cE
https://youtu.be/fv3_tWZPJIU
https://youtu.be/GeZIbCwqKYU
if you want me to make any ppt on any more topic do let me know on my youtube channel's comment section
This document discusses impression materials, beginning with definitions of key terms like impression, primary impression, secondary impression, cast, die, and tray. It covers the indications, requirements, and classification of impression materials. Specific materials discussed include impression compound, zinc oxide eugenol, and hydrocolloids. Hydrocolloids exist in sol and gel states and undergo an irreversible chemical reaction, examples being alginate which is used for making primary impressions, and agar.
This document discusses various die materials used for fixed prosthodontics. It begins by defining key terms like die and cast. It then describes the most commonly used die materials like gypsum products (dental stones), die stones, epoxy resins, and others. For each material, it covers properties, advantages, disadvantages and appropriate uses. It also discusses techniques to improve die properties and compatibility with different impression materials. Finally, it provides a comparison of different die materials in terms of their strengths and limitations. The overall document serves as a comprehensive guide to selecting and using die materials for fixed prosthodontic procedures.
Recent advances in dental materials/dental crown &bridge course by Indian den...Indian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
There have been several changes since inception in the field of dental ceramics. Need for newer materials with improved aesthetics, flexural strength and optical properties made it necessary for introduction of advanced technology in fabrication of dental ceramics.
This document provides information on wax patterns for dental restorations. It discusses the types and properties of dental waxes used for wax patterns, including composition, flow properties and ideal requirements. It also describes techniques for fabricating wax patterns, including additive and subtractive methods, developing axial contours and occlusal morphology, and finishing margins. The goal of the wax pattern is to define the final shape and size of the dental restoration that will be produced using the lost wax casting technique.
This document discusses denture base resins. It provides a brief history of denture materials from ancient Egypt to modern times. Key definitions are provided, including classifications of denture base resins. Ideal requirements and properties of denture base materials are outlined. Stages of polymerization and manipulation of the resins are described. Recent advancements and a literature review are mentioned.
The document provides information on various dental impression materials, including their history, composition, properties and uses. It discusses early materials like beeswax and impression compounds. It also covers alginate, which is the most widely used material due to its ease of use. Other elastic materials discussed include polysulfide, which was the first synthetic elastomer, and condensation silicone. The ideal properties of impression materials and their classifications are also outlined.
The document discusses elastic impression materials, specifically hydrocolloids like agar and alginate. It provides details on their composition, properties, uses and advantages/disadvantages. Agar is extracted from seaweed and sets via chemical reaction. Alginate is also derived from seaweed and sets via reaction with calcium sulfate. Both materials are inexpensive, easy to use and comfortable for patients, though they lack the accuracy of elastomers for crown and bridge work.
Commercially available, non-toxic, soluble material that is applied to the tissue surface of the denture to enhance retention, stability and performance.
This document provides an overview of glass ionomer cement (GIC), including its composition, classification, setting mechanism, applications and uses, advantages/disadvantages, and modifications/advancements. Specifically:
- GIC is composed of fluoroalumino silicate glass powder and an ionic polymer of polyacrylic acid. It sets via an acid-base reaction between the glass and polymer.
- GIC is classified based on its powder/liquid ratio and intended use, such as luting cement (Type I), restorative cement (Type II), or lining/base cement (Type III).
- The setting reaction involves dissolution of the glass powder, precipitation of salts, and hydration of
Glass ionomer cement is a tooth-colored dental restorative material that chemically binds to tooth structure. It was invented in 1969 and is based on the reaction between silicate glass powder and polyacrylic acid. Glass ionomer cement has several advantages, such as adhesion to tooth structure, fluoride release, and biocompatibility. However, its disadvantages include low fracture resistance and wear resistance compared to other materials. It is commonly used for restorations, linings, luting, and for its anticariogenic properties with fluoride release.
This article describes a modified one-step putty-wash impression technique that uses vacuum-formed resin sheets as spacers. The resin sheets are vacuum formed on a diagnostic cast to create spacers that are placed in the mouth during the impression to control the thickness of the light-body material. The putty material is used to make an impression of the teeth and spacers together. Then the spacers are removed and the light-body material is used to wash the definitive impression. This technique aims to control the thickness of the light body and minimize the disadvantages of a standard one-step technique.
This document discusses different types of abrasives and instruments used for grinding, finishing, polishing and contouring dental materials. It describes the characteristics of aluminum oxide, silicon carbide and diamond abrasives. It also explains the different shapes and grit sizes of abrasive discs, fluted burs and polishing points/stones that are suited for various dental procedures and materials like composites, ceramics, metals and porcelains.
This document provides an overview of denture base materials. It discusses the definition of a denture base and ideal properties. Denture base materials are classified as metallic or non-metallic. A history of materials used from the 18th century to present is provided, including vulcanite, acrylic resin, and newer polymers. Types of denture base polymers are described, including heat-cured acrylic resin, auto-polymerizing acrylic, and alternatives like fiber-reinforced polymers. Methods of polymerization and various commercial brands are also summarized.
This document discusses casting procedures and defects. It covers topics like the history of casting, wax patterns, spruing wax patterns, investing wax patterns, burning out wax, casting dental alloys, defects, and more. The lost wax technique involves surrounding a wax pattern with investment material, burning out the wax, and introducing molten metal into the mold. Proper spruing, investing, burnout, and casting are important to produce successful dental castings.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
cast and die preparation in fixed prosthodontics Dt Sarah Omari
Fixed prosthodontics involves permanently attached dental restorations like crowns and bridges. To prepare a working cast: the dentist takes an impression of the prepared tooth using silicone; the impression is sent to a lab where die stone is mixed and poured into the impression to create a stone model. The model is trimmed and prepared with pins to act as the working cast for fabricating the restoration.
The document discusses various die materials and systems used for indirect restorations. It defines a die as a positive reproduction of a prepared tooth used to fabricate restorations outside the mouth. Common die materials include gypsum, resins, metals and polymers, each with advantages and disadvantages. Removable die systems like dowel pins, Di-Lok and Pindex are discussed which allow repositioning of dies in the working cast for wax pattern fabrication. Proper selection of die material and system depends on factors like accuracy, strength and compatibility with impression materials.
Dental cements are materials used to join teeth and prosthetics or restorations. This document discusses different types of dental cements including their compositions, properties, clinical uses, and manipulation techniques. Zinc phosphate cement is the first cement described and is commonly used for permanent luting. Zinc polycarboxylate cement exhibits chemical bonding and is also used for permanent luting. Glass ionomer cement is tooth-colored, anticariogenic, and bonds adhesively to tooth structure making it suitable for restorations.
Impressions for fixed partial dentures /certified fixed orthodontic courses ...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
The document provides an overview of denture base resins including their definition, history, classification, key ingredients, and properties. It discusses the early use of materials like ivory, bone, and porcelain for dentures and the later development of vulcanite in the 1840s as the first affordable and workable material. Polymethyl methacrylate (PMMA) was introduced in the 1930s and became the standard material by 1946, providing improved properties over previous materials. The document outlines the polymerization process and ideal requirements for denture base resins based on biocompatibility, durability, and other factors. Heat-cured PMMA denture base resin is currently the most widely used material.
This document provides an overview of inelastic impression materials. It defines impression materials and their requirements. Impression compound is discussed, including its composition, properties, manipulation, and uses. It is a reversible, rigid material that sets by temperature change. Impression compound comes in sheets, cakes, sticks, and cones and is used for preliminary impressions, individual tooth impressions, border moulding, and special trays. Green stick compound is a type of impression compound supplied in cylinders for uses like border moulding.
Polishing of amalgam restoration involves producing a smooth, shiny surface using abrasives of decreasing coarseness to avoid heat generation. Objectives of polishing include ensuring patient comfort, maintaining proper occlusion, and allowing easy cleaning to promote oral hygiene. The process involves contouring and smoothing the amalgam surface after initial finishing, applying abrasives with minimal speed and pressure in order of coarseness, using rubber cups or discs with coolant. Polishing is concluded to be important for aesthetics and preventing corrosion.
Dental casting alloys can be categorized as either noble metal alloys or base metal alloys. Noble metal alloys contain precious metals like gold, palladium, or silver and are commonly used to create indirect restorations through lost wax casting. Base metal alloys do not contain precious metals and provide a more economical option for removable partial denture frameworks and other restorations requiring high strength. Both alloy types aim to have suitable mechanical properties for their intended use as well as biocompatibility and corrosion resistance through alloying elements and microstructure design.
Impressionmaterials/certified fixed orthodontic courses by Indian dental academyIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Impression materials /certified fixed orthodontic courses by Indian dental a...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
This document discusses denture base resins. It provides a brief history of denture materials from ancient Egypt to modern times. Key definitions are provided, including classifications of denture base resins. Ideal requirements and properties of denture base materials are outlined. Stages of polymerization and manipulation of the resins are described. Recent advancements and a literature review are mentioned.
The document provides information on various dental impression materials, including their history, composition, properties and uses. It discusses early materials like beeswax and impression compounds. It also covers alginate, which is the most widely used material due to its ease of use. Other elastic materials discussed include polysulfide, which was the first synthetic elastomer, and condensation silicone. The ideal properties of impression materials and their classifications are also outlined.
The document discusses elastic impression materials, specifically hydrocolloids like agar and alginate. It provides details on their composition, properties, uses and advantages/disadvantages. Agar is extracted from seaweed and sets via chemical reaction. Alginate is also derived from seaweed and sets via reaction with calcium sulfate. Both materials are inexpensive, easy to use and comfortable for patients, though they lack the accuracy of elastomers for crown and bridge work.
Commercially available, non-toxic, soluble material that is applied to the tissue surface of the denture to enhance retention, stability and performance.
This document provides an overview of glass ionomer cement (GIC), including its composition, classification, setting mechanism, applications and uses, advantages/disadvantages, and modifications/advancements. Specifically:
- GIC is composed of fluoroalumino silicate glass powder and an ionic polymer of polyacrylic acid. It sets via an acid-base reaction between the glass and polymer.
- GIC is classified based on its powder/liquid ratio and intended use, such as luting cement (Type I), restorative cement (Type II), or lining/base cement (Type III).
- The setting reaction involves dissolution of the glass powder, precipitation of salts, and hydration of
Glass ionomer cement is a tooth-colored dental restorative material that chemically binds to tooth structure. It was invented in 1969 and is based on the reaction between silicate glass powder and polyacrylic acid. Glass ionomer cement has several advantages, such as adhesion to tooth structure, fluoride release, and biocompatibility. However, its disadvantages include low fracture resistance and wear resistance compared to other materials. It is commonly used for restorations, linings, luting, and for its anticariogenic properties with fluoride release.
This article describes a modified one-step putty-wash impression technique that uses vacuum-formed resin sheets as spacers. The resin sheets are vacuum formed on a diagnostic cast to create spacers that are placed in the mouth during the impression to control the thickness of the light-body material. The putty material is used to make an impression of the teeth and spacers together. Then the spacers are removed and the light-body material is used to wash the definitive impression. This technique aims to control the thickness of the light body and minimize the disadvantages of a standard one-step technique.
This document discusses different types of abrasives and instruments used for grinding, finishing, polishing and contouring dental materials. It describes the characteristics of aluminum oxide, silicon carbide and diamond abrasives. It also explains the different shapes and grit sizes of abrasive discs, fluted burs and polishing points/stones that are suited for various dental procedures and materials like composites, ceramics, metals and porcelains.
This document provides an overview of denture base materials. It discusses the definition of a denture base and ideal properties. Denture base materials are classified as metallic or non-metallic. A history of materials used from the 18th century to present is provided, including vulcanite, acrylic resin, and newer polymers. Types of denture base polymers are described, including heat-cured acrylic resin, auto-polymerizing acrylic, and alternatives like fiber-reinforced polymers. Methods of polymerization and various commercial brands are also summarized.
This document discusses casting procedures and defects. It covers topics like the history of casting, wax patterns, spruing wax patterns, investing wax patterns, burning out wax, casting dental alloys, defects, and more. The lost wax technique involves surrounding a wax pattern with investment material, burning out the wax, and introducing molten metal into the mold. Proper spruing, investing, burnout, and casting are important to produce successful dental castings.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
cast and die preparation in fixed prosthodontics Dt Sarah Omari
Fixed prosthodontics involves permanently attached dental restorations like crowns and bridges. To prepare a working cast: the dentist takes an impression of the prepared tooth using silicone; the impression is sent to a lab where die stone is mixed and poured into the impression to create a stone model. The model is trimmed and prepared with pins to act as the working cast for fabricating the restoration.
The document discusses various die materials and systems used for indirect restorations. It defines a die as a positive reproduction of a prepared tooth used to fabricate restorations outside the mouth. Common die materials include gypsum, resins, metals and polymers, each with advantages and disadvantages. Removable die systems like dowel pins, Di-Lok and Pindex are discussed which allow repositioning of dies in the working cast for wax pattern fabrication. Proper selection of die material and system depends on factors like accuracy, strength and compatibility with impression materials.
Dental cements are materials used to join teeth and prosthetics or restorations. This document discusses different types of dental cements including their compositions, properties, clinical uses, and manipulation techniques. Zinc phosphate cement is the first cement described and is commonly used for permanent luting. Zinc polycarboxylate cement exhibits chemical bonding and is also used for permanent luting. Glass ionomer cement is tooth-colored, anticariogenic, and bonds adhesively to tooth structure making it suitable for restorations.
Impressions for fixed partial dentures /certified fixed orthodontic courses ...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
The document provides an overview of denture base resins including their definition, history, classification, key ingredients, and properties. It discusses the early use of materials like ivory, bone, and porcelain for dentures and the later development of vulcanite in the 1840s as the first affordable and workable material. Polymethyl methacrylate (PMMA) was introduced in the 1930s and became the standard material by 1946, providing improved properties over previous materials. The document outlines the polymerization process and ideal requirements for denture base resins based on biocompatibility, durability, and other factors. Heat-cured PMMA denture base resin is currently the most widely used material.
This document provides an overview of inelastic impression materials. It defines impression materials and their requirements. Impression compound is discussed, including its composition, properties, manipulation, and uses. It is a reversible, rigid material that sets by temperature change. Impression compound comes in sheets, cakes, sticks, and cones and is used for preliminary impressions, individual tooth impressions, border moulding, and special trays. Green stick compound is a type of impression compound supplied in cylinders for uses like border moulding.
Polishing of amalgam restoration involves producing a smooth, shiny surface using abrasives of decreasing coarseness to avoid heat generation. Objectives of polishing include ensuring patient comfort, maintaining proper occlusion, and allowing easy cleaning to promote oral hygiene. The process involves contouring and smoothing the amalgam surface after initial finishing, applying abrasives with minimal speed and pressure in order of coarseness, using rubber cups or discs with coolant. Polishing is concluded to be important for aesthetics and preventing corrosion.
Dental casting alloys can be categorized as either noble metal alloys or base metal alloys. Noble metal alloys contain precious metals like gold, palladium, or silver and are commonly used to create indirect restorations through lost wax casting. Base metal alloys do not contain precious metals and provide a more economical option for removable partial denture frameworks and other restorations requiring high strength. Both alloy types aim to have suitable mechanical properties for their intended use as well as biocompatibility and corrosion resistance through alloying elements and microstructure design.
Impressionmaterials/certified fixed orthodontic courses by Indian dental academyIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Impression materials /certified fixed orthodontic courses by Indian dental a...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
Impression materials /certified fixed orthodontic courses by Indian dental ac...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Impression materials and techniques in fpd /orthodontic courses by Indian den...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.
Impression materials /certified fixed orthodontic courses by Indian dental ac...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The document discusses different types of impression materials used in dentistry, including hydrocolloids like alginate and agar, as well as elastomeric materials. It provides details on the composition, setting reactions, properties and uses of each material. Reversible hydrocolloids include agar while irreversible types include alginate. Elastomeric materials can be aqueous like hydrocolloids or non-aqueous, with the non-aqueous types further divided into condensation polymerized materials like polysulfide and condensation-cured silicones, or addition polymerized materials like addition-cured silicones and polyethers.
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
The document discusses various types of impression materials used in dentistry, including hydrocolloids (agar and alginate), polysulfide, condensation polymerized silicones, and addition polymerized silicones. It provides details on the composition, chemical reactions, properties and uses of each material. For example, it notes that alginate impressions are inexpensive and easy to use but can deteriorate over time, while silicones and polysulfides are more accurate but may shrink slightly due to the release of water or ethanol during curing.
Elastic impression materials /certified fixed orthodontic courses by Indian d...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
This document discusses impression materials and techniques used in orthodontics. It begins with an introduction to impression materials and their importance in orthodontics. It then covers the history of impression materials, ideal requisites of materials, and classifications. Specific materials discussed include alginate, agar, and silicones. Impression techniques, trays, and applications for specific clinical situations like cleft palate are also summarized. The document provides an overview of common impression materials and techniques used in orthodontics.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
This document provides an overview of the history and development of denture base materials over time, from early materials like wood and bone to modern day PMMA. It discusses the requirements of an ideal denture base material and introduces PMMA, describing the polymerization reaction and different types of denture base resins including heat, chemically and light activated. The document outlines the physical properties of resins and recent advancements, providing details on the polymerization process and factors that influence it.
Recent advances in dental materials certified fixed orthodontic courses by In...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Similar to Impressionmaterials/ implant dentistry course (20)
Opportunity for Dentists (BDS/MDS )to relocate to United kingdom -Register as a DENTAL HYGIENIST/ DENTAL THERAPIST without Board exams and after approval you can register in GDC as a DH/DT and start working as a DH/DT Immediately and get paid.
You can complete the whole process in 3-4 months.Salary range for DH/DT is around 2500-3500 Pounds per month.
Eligibility / requirements-
1. An International English Language Testing System (IELTS) certificate
at the appropriate level.(Within 2 yrs of application date )
2: A recent primary dental qualification that has been taught and examined in English..(Within 2 yrs of application date )
3: A recent pass in a language test for registration with a regulatory authority in a country where the first language is English.
If you are interested Please contact us for more details.
1ST, 2ND AND 3RD ORDER BENDS IN STANDARD EDGEWISE APPLIANCE SYSTEM /Fixed ort...Indian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals
who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry,
Periodontics and General Dentistry.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
I –Aligners are made with FDA approved transparent thermoplastic materials using 3D scanning, 3D Printing and finally Trays with Pressure vacuum formers.
Dear Doctor,
Indian Dental Academy Now offers comprehensive online Orthodontics course.
Course includes:
1.whiteboard lecture presentations
2.Case Discussions
3.with hundreds of pictures.
4.Demo on Models
5.Demo on Patients
6. subtitles in your own language
12 months unlimited access and support @350 USD only.
For Demo please visit :www.idalectures.com/preview/
For more details visit: www.idalectures.com
Please contact us for any clarifications:
idalectures@gmail.com
indiandentalacademy@gmail.com
Thanks & Regards
Indian Dental Academy
--
Indian Dental Academy
Leader in continuing dental education
www.indiandentalacademy.com
skype:indiandentalacademy
+919248678078
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Cytotoxicity of silicone materials used in maxillofacial prosthesis / dental ...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Diagnosis and treatment planning in completely endntulous arches/dental coursesIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Properties of Denture base materials /rotary endodontic coursesIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Use of modified tooth forms in complete denture occlusion / dental implant...Indian dental academy
This document discusses dental occlusion concepts and philosophies for complete dentures. It introduces key terms like physiologic occlusion and defines different occlusion schemes like balanced articulation and monoplane articulation. The document discusses advantages and disadvantages of using anatomic versus non-anatomic teeth for complete dentures. It also outlines requirements for maintaining denture stability, such as balanced occlusal contacts and control of horizontal forces. The goal of occlusion for complete dentures is to re-establish the homeostasis of the masticatory system disrupted by edentulism.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
This document discusses dental casting investment materials. It describes the three main types of investments - gypsum bonded, phosphate bonded, and ethyl silicate bonded investments. For gypsum bonded investments specifically, it details their classification, composition including the roles of gypsum, silica, and modifiers, setting time, normal and hygroscopic setting expansion, and thermal expansion. It provides information on how the properties of gypsum bonded investments are affected by their composition. The document serves as a comprehensive overview of dental casting investment materials.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) CurriculumMJDuyan
(𝐓𝐋𝐄 𝟏𝟎𝟎) (𝐋𝐞𝐬𝐬𝐨𝐧 𝟏)-𝐏𝐫𝐞𝐥𝐢𝐦𝐬
𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
- Understand the goals and objectives of the Edukasyong Pantahanan at Pangkabuhayan (EPP) curriculum, recognizing its importance in fostering practical life skills and values among students. Students will also be able to identify the key components and subjects covered, such as agriculture, home economics, industrial arts, and information and communication technology.
𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Leveraging Generative AI to Drive Nonprofit InnovationTechSoup
In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
6. Elastomeric Impression Materials
• Viscoelastic
– physical properties vary
• rate of loading
• Rapidly remove
– decreases permanent
deformation
• chains recoil from a recoverable distance
– increases tear strength
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
7. Aqueous Hydrocolloids
• Colloidal suspensions
– chains align to form fibrils
– traps water in interstices
• Two forms
– sol
• viscous liquid
– gel
• elastic solid
• Placed intra-orally as sol
– converts to gel
• thermal or chemical process
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
8. Aqueous Hydrocolloids
• Semi-permeable membranes
– poor dimensional stability
• Evaporation
• Syneresis
– fibril cross linking continues
• contracts with time
• exudes water
• Imbibition
– water absorption
• swells
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
12. Manipulation
• 3 chamber conditioning unit
– (1) liquefy at 100°C for
10 minutes
• converts gel to sol
– (2) store at 65°C
– place in tray
– (3) temper at 46°C for 3 minutes
– seat tray
– cool with water at 13°C for 3 minutes
• converts sol to gel
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
13. Advantages
• Dimensionally accurate
• Hydrophilic
– displace moisture, blood, fluids
• Inexpensive
– after initial equipment
• No custom tray or adhesives
• Pleasant
• No mixing required
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
14. Disadvantages
• Initial expense
– special equipment
• Material prepared in advanced
• Tears easily
• Dimensionally unstable
– immediate pour
– single cast
• Difficult to disinfect
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
15. Irreversible Hydrocolloid
(Alginate)
• Most widely used
impression material
• Indications
– study models
– removable fixed partial dentures
• framework
• Examples
– Jeltrate (Dentsply/Caulk)
– Coe Alginate (GC America)
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
17. Manipulation
• Weigh powder
• Powder added to water
– rubber bowl
– vacuum mixer
• Mixed for 45 sec to 1 min
• Place tray
• Remove 2 to 3 minutes
– after gelation (loss of tackiness)
Caswell JADA 1986
www.indiandentalacademy.com
18. Advantages
• Inexpensive
• Easy to use
• Hydrophilic
– displace moisture, blood, fluids
• Stock trays
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
19. Disadvantages
• Tears easily
• Dimensionally unstable
– immediate pour
– single cast
• Lower detail reproduction
– unacceptable for fixed pros
• High permanent deformation
• Difficult to disinfect
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
20. Non-Aqueous Elastomers
• Synthetic rubbers
– mimic natural rubber
• scarce during World War II
• Large polymers
– some chain lengthening
– primarily cross-linking
• Viscosity classes
– low, medium, high, putty
– monophasic
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
23. Composition
• Base
– polysulfide polymers
– fillers
– plasticizers
• Catalyst
– lead dioxide (or copper)
– fillers
• By-product
– water
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
24. --SH HS---------------------SH HS--
S
H
O
=
Pb
=
O
O
=
Pb
=
OO = Pb = O
H
S
-S-S---------------S-S-
S
S
+ 3PbO + H2O
mercaptan + lead dioxide polysulfide rubber + lead oxide + water
Polysulfide Reaction
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
25. Manipulation
• Adhesive to tray
• Uniform layer
– custom tray
• Equal lengths of pastes
• Mix thoroughly
– within one minute
• Setting time 8 – 12 minutes
• Pour within 1 hour
www.indiandentalacademy.com
26. Advantages
• Lower cost
– compared to silicones and polyethers
• Long working time
• High tear strength
• High flexibility
• Good detail reproduction
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
27. Disadvantages
• Poor dimensional stability
– water by-product
– pour within one hour
– single pour
• Custom trays
• Messy
– paste-paste mix
– bad odor
– may stain clothing
• Long setting time
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
29. Composition
• Base
– poly(dimethylsiloxane)
– tetraethylorthosilicate
– filler
• Catalyst
– metal organic ester
• By-product
– ethyl alcohol
Phillip’s 1996
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
30. HO – Si – O – Si - O - H
CH3
CH3 CH3
CH3 n
HO – Si – O – Si - O - H
CH3
CH3 CH3
CH3 n
C2H5O OC2H5
Si
C2H5O OC2H5
HO – Si – O – Si - O -
CH3
CH3 CH3
CH3 n
HO – Si – O – Si - O -
CH3
CH3 CH3
CH3 n
OC2H5
Si
OC2H5
+ 2C2H5OH
Condensation
Silicone
Reaction
metal organic ester
ethanol
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
32. Advantages
• Better elastic properties
• Clean, pleasant
• Stock tray
– putty-wash
• Good working and setting time
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
33. Disadvantages
• Poor dimensional stability
– high shrinkage
• polymerization
• evaporation of ethanol
– pour immediately
• within 30 minutes
• Hydrophobic
– poor wettability
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
35. Composition
• Improvement over condensation silicones
– no by-product
• First paste
– vinyl poly(dimethylsiloxane)
prepolymer
• Second paste
– siloxane prepolymer
• Catalyst
– chloroplatinic acid
Phillip’s 1996
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
36. O
H - Si – CH3
O
CH3 - Si - H
O
---O – Si – CH = CH2
CH3
CH3 CH = CH2 – Si – O ---
CH3
CH3
O
- Si – CH3
O
CH3 - Si -
O
---O – Si – CH2 - CH2
CH3
CH3
CH2 - CH2 – Si – O ---
CH3
CH3
Chloroplatinic Acid Catalyst
Addition
Silicone
Reaction
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
37. Manipulation
• Adhesive to tray
• Double mix
– custom tray
• heavy-body
– light-body to prep
• Putty-wash
– stock tray
Craig Adv Dent Res 1988
www.indiandentalacademy.com
38. Advantages
• Highly accurate
• High dimensional stability
– pour up to one week
• Stock or custom trays
• Multiple casts
• Easy to mix
• Pleasant odor
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
39. Disadvantages
• Expensive
• Sulfur inhibits set
– latex gloves
– ferric and Al sulfate
retraction solution
• Pumice teeth before
impressing
• Short working time
• Lower tear strength
• Possible hydrogen gas release
– bubbles on die
– palladium added to absorb
Manikos Aust Dent J 1998
www.indiandentalacademy.com
40. Addition Silicones
• Surfactants added
– reduce contact angle
– improved
• castability
– gypsum
• wettability??
– still need dry field clinically
Pratten J Dent Res 1987
Mandikos Aust Dent J 1998
www.indiandentalacademy.com
42. • Base
– difunctional epimine-terminated prepolymer
– fillers
– plasticizers
• Catalyst
– aromatic sulfonic acid ester
– fillers
• Cationic polymerization
– ring opening and chain extension
Composition
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
43. SO3
-
+ R+
CH3 – CH – CH2 – CO2 – CH – (CH2)n – O – CH – (CH2)n – CO2 –CH2 – CH –CH3
N
H2C CH2
R R
m
N
H2C CH2
N
H2C CH2
R – N – CH2 – CH2 – +
N
H2C CH2
N
H2C CH2
R – +
+
Polyether Reaction
catalyst
base
ring opening
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
44. Manipulation
• Adhesive to tray
– stock or custom tray
• very stiff
• Paste-paste mix
• Auto-mixing
– hand-held
• low viscosity
– mechanical dispenser
• high viscosity
www.indiandentalacademy.com
45. Advantages
• Highly accurate
• Good dimensional stability
• Stock or dual-arch trays
• Good surface detail
• Pour within one week
– kept dry
• Multiple casts
• Good wettability
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
46. Disadvantages
• Expensive
• Short working time
• Rigid
– difficult to remove from undercuts
• Bitter taste
• Low tear strength
• Absorbs water
– changes dimension
Phillip’s Science of Dental Materials 1996
www.indiandentalacademy.com
47. Handling Properties
Agar Alginate Polysulfide
Condensation
Silicone
Addition
Silicone
Polyether
Preparation
Boil,
temper,
store
Powder,
water
2 pastes
2 pastes or
paste/liquid
2 pastes 2 pastes
Ease of Use Technique
sensitive
Good Fair Fair Excellent Good
Patient
Reaction
Thermal
Shock
Pleasant,
clean
Unpleasant,
stains
Pleasant,
clean
Pleasant
Unpleasant
clean
Ease of
removal
Very
easy
Very
easy
Easy Moderate Moderate
Moderate
to difficult
Disinfection Poor Poor Fair Fair Excellent Fair
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
48. Handling Properties
Agar Alginate Polysulfide
Condensation
Silicone
Addition
Silicone
Polyether
Working
Time (min)
7 – 15 2.5 5 – 7 3 2 –4.5 2.5
Setting Time
(min)
5 3.5 8 – 12 6 – 8 3 – 7 4.5
Stability 1 hour
100% RH
Immediate
pour
1 hour
Immediate
pour
1 week
1 week
kept dry
Wettability
and
castability
Excellent Excellent Fair Fair
Fair to
good
Good
Cost Low Very low Low Moderate
High to
very high
Very high
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
50. Comparison of Properties
• Working time
– longest to shortest
• agar > polysulfide > silicones > alginate = polyether
• Setting time
– shortest to longest
• alginate < polyether < agar < silicones < polysulfide
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
51. Comparison of Properties
• Stiffness
– most to least
• polyether > addition silicone > condensation silicone >
polysulfide = hydrocolloids
• Tear strength
– greatest to least
• polysulfide > addition silicone > polyether >
condensation silicone >> hydrocolloids
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
52. Comparison of Properties
• Cost
– lowest to highest
• alginate < agar = polysulfide <condensation silicone
< addition silicone < polyether
• Dimensional stability
– best to worst
• addition silicone > polyether > polysulfide >
condensation silicone > hydrocolloid
Phillip’s 1996
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
53. Comparison of Properties
• Wettability
– best to worst
• hydrocolloids > polyether > hydrophilic addition
silicone > polysulfide > hydrophobic addition silicone
= condensation silicone
• Castability
– best to worst
• hydrocolloids > hydrophilic addition silicone >
polyether > polysulfide > hydrophobic addition
silicone = condensation silicone
O’Brien Dental Materials & their Selection 1997
www.indiandentalacademy.com
54. Summary
• Study models
– Alginate most widely used
• inexpensive
• displaces moisture
• lower detail reproduction
• dimensionally unstable
www.indiandentalacademy.com
55. Summary
• Prosthodontics
– Addition silicones most popular
• accurate
• dimensionally stable
• user friendly
• expensive
www.indiandentalacademy.com
56. • A good Impression must aid to fulfill M.M.
Devan’s dictum: “It is the perpetual
preservation of what already exists and not
the meticulous replacement of what is
missing.”
www.indiandentalacademy.com
57. • DEFINITION
• A COMPLETE DENTURE IMPRESSION is
the negative registration of the entire denture
bearing, stabilizing and border seal areas, of
either the maxillas or mandible in a plastic
material that becomes relatively hard or set
while in contact with these tissues.
www.indiandentalacademy.com
58. A PRELIMINARY IMPRESSION is made
for the purpose of diagnostic treatment
planning and the construction of a custom
tray while a FINAL IMPRESSION is used
for making the master cast over which the
denture bases are fabricated.
www.indiandentalacademy.com
59. • According to GPT, 7th Edition, 1999
Impression is defined as a negative likeness
or copy in reverse of the surface of an
object; an imprint of the teeth and adjacent
structures for use in dentistry
www.indiandentalacademy.com
60. • The five objectives of an impression as stated by
Carl.D. Boucher in 1944 are
• 1) PRESERVATION OF THE ALVEOLAR
RIDGES. This is achieved by using impression
techniques which cover maximum supporting areas as
possible and using pressure within physiologic limit
of the tissue.
• (2) RETENTION - The factors of retention are (1)
adhesion (2) cohesion (3) interfacial surface tension
(4) mechanical locking into undercuts (5) peripheral
seal and atmospheric pressure and (6) oral and facial
musculature. Henry A. Collet in 1965 stated that
primary retention depends upon close adaptation to
the tissues and is proportionate to the area covered.
www.indiandentalacademy.com
61. • . (3) STABII.ITY - It is the relationship of the
denture base to the underlying bone.
• Samuel Friedman in 1957, stated that stability
is developed in the impression technique
through more intimate contact of the labial
and buccal flanges with the labial and buccal
slopes and of the lingual flanges with the
lingual slopes of the ridges. Boucher stated
that stability requires maximum use of all
bony foundations where the tissues are firmly
and closely attached to bone.
www.indiandentalacademy.com
62. • . (4) SUPPORT - Support is provided by the
maxillary and the mandibular bones and their
covering of mucosal tissue. It is enhanced by
selective placement of pressures that are in
harmony with the resiliency of the tissues that
make up the basal seat.
• (5) ESTHETICS - Role of esthetics in impression
making refers to the development of the labial and
buccal borders, so that they are not only retentive
but also support the lips and cheeks properly.
www.indiandentalacademy.com
63. • Fisher R.D. in 1951 laid down six
fundamental rules for making full denture
impressions –
• (1) Roentgenographics, visual and digital
examination of the oral cavity
• (2) Surgical removal of such abnormal
formations as would prevent successful
completion of impressions.
• (3) the require extension outlines.
• (4) the location and position for area of
variable tissue displaceability (
• 5) the required retention outline and
• (6) the required adaptation.www.indiandentalacademy.com
64. • IMPRESSION TECHNIQUES may be
classified depending on, [A] Amount of
pressure used (Based on the theories of
impression).
• Pressure technique based on pressure theory
• Minimal pressure technique - based on
mucostatic theory.
• Selective pressure technique -based on
selective pressure theory.
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65. • [B] 1. Open or
• 2. Closed mouth
• [C] 1. Hand-manipulation or
• 2. Functional movements
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66. • [D] Type of tray
• 1. Stock tray : 1. Caulks Edentulous Rimlock
Trays.
• 2. McGowen Winkler Trays (mandibular)
• 3. STO-K Trays. (Square, round or Tapering
shapes of ridges).
• 2. Custom or special tray
• 1. Shellac
• 2. Acrylic
• 3. Wax.
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67. Thank you
For more details please visit
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