Impression Trays (PPT).pptx
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This document discusses impression trays, which are used to carry and control impression material in the mouth. It defines impression trays and describes their requirements, such as being rigid but not too thick. The document outlines different types of impression trays, including those made of different materials, stock versus custom trays, and trays for edentulous versus dentulous patients. It provides details on selecting and using stock and custom impression trays for making impressions.
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A special tray is defined final
This document discusses the characteristics, materials, and fabrication process of special trays used for dental impressions. Special trays should be well-adapted, dimensionally stable, and free of voids or projections. Relief wax is adapted to mark relief areas on the cast, and a spacer is used to allow for even impression material thickness. Stops are cut into the spacer to ensure the tray touches the ridge in specific areas. The tray is then acrylized and a handle is fabricated before it is prepared for use in border molding.
tray definition and classification
Impression trays are devices used to carry, confine, and control impression material while making an impression. There are two main types of trays: prefabricated stock trays and individualized custom trays. Stock trays are used for primary impressions while custom trays are used for final impressions. Trays can be made of various materials like metal, plastic, acrylic, or thermoplastic resin. The selection of a tray depends on factors like the type of impression needed and whether the patient is edentulous or dentulous.
The occlusal rims and record
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
custom trays & master casts
The document discusses the process of making custom trays and master casts for complete dentures, including taking final impressions, border molding, and boxing and pouring the impressions to create the definitive master casts. Key steps include fabricating a custom tray, border molding with low-fusing compound or impression material, taking final impressions with materials like zinc oxide eugenol or elastomers, and boxing and pouring the impressions in dental stone to create the finished master casts.
Special tray prosthodontics
The document discusses impression trays, which are used to carry and control impression material in the mouth. It describes different types of trays, including stock trays, custom trays, and special trays. Special trays are custom-made for each patient based on a preliminary cast and are used to make final impressions. The document outlines the procedure for fabricating a special tray using materials like shellac, acrylic resin, and wax spacers. Special trays provide accurate impressions and are more comfortable for patients compared to stock trays.
Impression compound
Impression compounds are thermoplastic materials used for dental impressions. They are composed mainly of rosin, copal resin, carnauba wax, stearic acid, and talc. There are two main types - lower fusing impression compound and higher fusing tray compound. Impression compound is a viscous material that is softened in hot water before making impressions, allowing it to flow and capture detail but also maintain shape. While able to displace soft tissue, its high viscosity limits fine detail capture. Impression compound requires careful heating and cooling to avoid distortion, and constructs must be poured promptly due to its marginal dimensional stability.
Custom tray fabrication and materials in complete denture
A custom made device prepared for a particular patient which is used to confine and control an impression material making an impression.
It makes on the cast obtained from primary impression.
It is used for making final impression.
Edentulous ridge shows variations in shape and size.
It shows the type of impression technique
1, Selective pressure technique
2, Minimal pressure technique
Elastomeric impression materials
The document provides an overview of elastomeric impression materials. It begins with an introduction and definitions of key terms like elastomer and elastomeric impression materials. It then discusses the history and classifications of impression materials. The document outlines the ideal requirements for impression materials and their clinical applications. It describes the properties and composition of various elastomers like polysulfide, condensation silicone, addition silicone, and polyether. It discusses recent advances in impression materials and effects of mishandling impressions. In conclusion, the document provides a comprehensive review of elastomeric impression materials.
Recommended
A special tray is defined final
This document discusses the characteristics, materials, and fabrication process of special trays used for dental impressions. Special trays should be well-adapted, dimensionally stable, and free of voids or projections. Relief wax is adapted to mark relief areas on the cast, and a spacer is used to allow for even impression material thickness. Stops are cut into the spacer to ensure the tray touches the ridge in specific areas. The tray is then acrylized and a handle is fabricated before it is prepared for use in border molding.
tray definition and classification
Impression trays are devices used to carry, confine, and control impression material while making an impression. There are two main types of trays: prefabricated stock trays and individualized custom trays. Stock trays are used for primary impressions while custom trays are used for final impressions. Trays can be made of various materials like metal, plastic, acrylic, or thermoplastic resin. The selection of a tray depends on factors like the type of impression needed and whether the patient is edentulous or dentulous.
The occlusal rims and record
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
custom trays & master casts
The document discusses the process of making custom trays and master casts for complete dentures, including taking final impressions, border molding, and boxing and pouring the impressions to create the definitive master casts. Key steps include fabricating a custom tray, border molding with low-fusing compound or impression material, taking final impressions with materials like zinc oxide eugenol or elastomers, and boxing and pouring the impressions in dental stone to create the finished master casts.
Special tray prosthodontics
The document discusses impression trays, which are used to carry and control impression material in the mouth. It describes different types of trays, including stock trays, custom trays, and special trays. Special trays are custom-made for each patient based on a preliminary cast and are used to make final impressions. The document outlines the procedure for fabricating a special tray using materials like shellac, acrylic resin, and wax spacers. Special trays provide accurate impressions and are more comfortable for patients compared to stock trays.
Impression compound
Impression compounds are thermoplastic materials used for dental impressions. They are composed mainly of rosin, copal resin, carnauba wax, stearic acid, and talc. There are two main types - lower fusing impression compound and higher fusing tray compound. Impression compound is a viscous material that is softened in hot water before making impressions, allowing it to flow and capture detail but also maintain shape. While able to displace soft tissue, its high viscosity limits fine detail capture. Impression compound requires careful heating and cooling to avoid distortion, and constructs must be poured promptly due to its marginal dimensional stability.
Custom tray fabrication and materials in complete denture
A custom made device prepared for a particular patient which is used to confine and control an impression material making an impression.
It makes on the cast obtained from primary impression.
It is used for making final impression.
Edentulous ridge shows variations in shape and size.
It shows the type of impression technique
1, Selective pressure technique
2, Minimal pressure technique
Elastomeric impression materials
The document provides an overview of elastomeric impression materials. It begins with an introduction and definitions of key terms like elastomer and elastomeric impression materials. It then discusses the history and classifications of impression materials. The document outlines the ideal requirements for impression materials and their clinical applications. It describes the properties and composition of various elastomers like polysulfide, condensation silicone, addition silicone, and polyether. It discusses recent advances in impression materials and effects of mishandling impressions. In conclusion, the document provides a comprehensive review of elastomeric impression materials.
Impression Materials (Dental)
This document discusses impression materials used in dentistry. It describes the different types of impression materials including alginate, compound, and hydrocolloid. Alginate is the most commonly used irreversible hydrocolloid for preliminary impressions due to its low cost, ease of use, and ability to provide good surface detail. However, alginate impressions are susceptible to dimensional changes from imbibition or syneresis if not properly stored. Compound is a thermoplastic material that is inexpensive but has poor dimensional stability and flow. Proper technique such as cooling the impression is important when using compound to reduce distortion.
Heat cure acrylic
The document discusses heat cure acrylic denture base resins. It provides background on the development of denture base materials over time. Polymethyl methacrylate (PMMA) was introduced in 1937 and remains the material of choice due to its superior esthetics, ease of processing, accurate fit, and use with inexpensive equipment. The document describes the composition, chemical basis of polymerization, manipulation techniques including compression molding and injection molding, and physical properties of heat cure acrylic resins. It also compares heat cure resins to self-cure resins and discusses requirements versus clinical performance as well as recent advances in the material.
Fundamentals in tooth preparation .
The document discusses the fundamentals of tooth preparation. It defines tooth preparation as the mechanical alteration of a tooth to receive a restorative material. The objectives are to remove defects, extend restorations conservatively, form preparations to resist fracture under force and allow for esthetic and functional placement of material. Key terminology includes walls, angles, and classifications of different types of restorations. The stages of initial preparation establish outline and resistance form, while final preparation focuses on secondary features, finishing, and cleaning.
Denture base materials
This document discusses denture base materials, specifically acrylic resins. It begins by defining denture base and classifying denture base resins as non-metallic, metallic, temporary or permanent. Ideal requirements of dental resins are listed. Composition and differences between heat cure and self cure acrylic resins are provided. Processing techniques like compression molding and the curing cycle are described. Other resin types like light activated are also mentioned. Common processing errors in acrylic resins like porosity, crazing and warpage are listed.
Composite resin
Composite materials are made of a resin matrix and filler particles. They have superior properties to their individual components. There are several types of composites classified by filler particle size: macrofilled (8-12 μm), small particle (1-5 μm), microfilled (0.04-0.4 μm), and hybrid (1 μm). Macrofilled composites have the largest particles and produce the roughest surfaces, while microfilled composites have the smallest particles and smoothest surfaces. Hybrid composites have a mixture of particle sizes. The different types have various indications for use depending on their mechanical properties and ability to be polished.
Glass ionomer cement
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Contraindication Of GIC
Types Of GIC
Recent Advances
Conclusion
References.
PRIMARY & SECONDARY IMPRESSION IN CD.ppt
1. A complete denture impression is a negative registration of the entire denture bearing, stabilizing and border seal areas in the edentulous mouth. It involves making a preliminary impression to create a custom tray, followed by border molding and the final impression.
2. Key areas to capture in the impression include the hard palate, tuberosities, residual ridges, and relief areas like the incisive foramen. For the mandible, the buccal shelf, retromolar pad, and mental foramen are important.
3. The main objectives of impression making are support, retention, stability, aesthetics, and preserving the alveolar ridges to fabricate dentures that fit well
Impression materials
The document discusses dental impression materials. It provides details on the classification, composition, properties, manipulation and applications of various impression materials including alginate, agar, impression compound, zinc oxide eugenol and silicone impressions materials. Impression materials are classified based on their setting mechanism and elasticity into rigid or elastic materials that set via a chemical reaction or temperature change. The document describes the key ingredients, setting reactions, advantages and disadvantages of different impression materials.
Stock trays
This document discusses stock trays used in dental impressions. Stock trays come in various materials like metal or plastic and have parts like a handle and flanges. They must be rigid but not too thick and simulate the finished denture. The borders should be smooth, rounded, and end 2mm short of the vestibular depth. Stock trays come in perforated for alginate or non-perforated for compound, and different shapes for dentulous or edentulous patients. Adhesives are needed to ensure impression materials firmly adhere to stock trays, like resin solutions for alginates.
Casts, dies and cast forming
This document discusses various materials and methods used for making casts and dies in prosthodontics. It describes the properties required for casts such as being void-free and distortion-free. Common materials used include dental stone/gypsum and alternatives like resins. Methods covered include wax boxing, dental plaster boxing, and caulking compound boxing for final impressions. The properties of dental stone like setting expansion, setting time and compressive strength are also outlined. Different types of casts like diagnostic, working and refractory casts are defined.
Casting procedures
This document outlines the steps in the lost wax casting procedure for dental restorations. It begins by introducing lost wax casting and describing the key steps: 1) Wax pattern removal, 2) Spruing, 3) Investing, 4) Burnout, 5) Casting. It then provides details on wax patterns, sprue formers, crucible formers, casting rings, and the investing procedure. Important considerations for each step are highlighted to produce an accurate casting.
Clasps
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
procedure for amalgam restoration
The document provides information on the procedure for amalgam restoration. It discusses the appropriate mercury to alloy ratio, which is typically 1:1. It describes the steps of trituration to mix the alloy and mercury using either hand mixing or mechanical mixing. Proper trituration is important to coat the alloy particles. The document also outlines the steps for condensing the amalgam into the cavity preparation using incremental layering and discusses carving and polishing the final restoration.
Dental amalgam
Dental amalgam is an alloy used as a dental restorative material. It consists of mercury combined with other metals like silver, tin, and copper. Amalgam undergoes a setting reaction when mixed with liquid mercury to form a hard material. It is indicated for restoring cavities. While it has advantages like strength and cost-effectiveness, it lacks esthetics and can release low levels of mercury vapor. Modern amalgams have improved properties like reduced creep and shrinkage. Careful manipulation is required to achieve optimal physical properties and reduce risks.
Articulator
The document defines an articulator as a mechanical device that represents the temporomandibular joints and jaw members to attach dental casts and simulate jaw movements. Articulators are used to hold dental casts in a fixed relationship, simulate jaw movements like opening and closing, and reproduce border and intra-border tooth movements. They allow dentists to visualize occlusion, plan treatments, fabricate restorations, and arrange artificial teeth by simulating jaw movements without needing patient cooperation. Common components of articulators include upper and lower members to hold the casts, an incisal guide table, condylar guidance, and incisal pin to maintain relationships during jaw simulation. Articulators can be classified based on the occlusion theory they follow, the
maxillary anatomical landmarks
This document provides an overview of anatomical landmarks in the maxilla that are important for complete denture construction. It discusses intraoral landmarks like the labial and buccal frenums, as well as maxillary arch structures like the residual alveolar ridge, hard palate, palatal rugae, incisive papilla, hamular notch, maxillary tuberosity, and fovea palatinae that serve as stress bearing or relief areas. The document emphasizes understanding the histology and functions of these structures to ensure dentures are designed and placed to avoid placing undue pressure on supporting tissues.
Primary impression
An impression in complete dentures is a negative registration of the denture bearing areas made of a material that sets in the mouth. There are different types of impressions based on theories, techniques, trays, and materials used. The objectives of making an impression are to preserve remaining structures, provide retention, stability, support and esthetics. A stock or custom tray is used depending on needs, and materials must be dimensionally stable and reproduce anatomical details accurately.
Cavity liners and_bases_2
Liners and bases are placed between dentin (or pulp) and a restoration to provide pulpal protection. Liners are thin layers that provide a barrier against residual reactants and oral fluids penetrating between the restoration and tooth. Bases are thicker (1-2mm) and provide additional thermal protection and support restoration forces. The need for liners depends on the restoration material and cavity location/depth. Newer liners focus on chemical protection through sealing and adhesion rather than pulpal medication. The choice of liner depends on remaining dentin thickness and restoration material.
Gypsum products
This document discusses different types of gypsum products used in dentistry, including dental plaster, stone, and improved stone. It describes the differences between these products in terms of their crystal structure, density, strength, and setting properties. Dental plaster is the most porous and weakest, while improved stone has the densest and strongest crystals. The document also explains how the setting times and strengths of gypsum products can be modified by adjusting the water-powder ratio or adding chemicals during mixing.
Kennedy’s Classification in Cast Partial Denture
This document discusses Kennedy's classification system for partially edentulous arches and Applegate's rules for applying the Kennedy classification. It provides details on Kennedy's four basic classes for partial edentulism and Applegate's eight rules to govern the application of Kennedy's classification. Examples are given to demonstrate how to use Kennedy's classification and Applegate's rules to classify different clinical scenarios of partial edentulism.
Beginner Guide to Impression Trays in Dentistry
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Impression_Trays Dental Prosth 2.pdf
The document discusses different types of impression trays used in dentistry. It defines impression trays as devices that carry, confine and control impression material in the mouth. The key types discussed are stock trays, which are pre-made and reusable, and custom trays, which are fabricated for a specific patient based on a preliminary cast. Stock trays come in various sizes and materials, while custom trays provide a better fit and less impression material is needed. The document provides details on selecting and fabricating different types of impression trays.
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Impression Materials (Dental)
This document discusses impression materials used in dentistry. It describes the different types of impression materials including alginate, compound, and hydrocolloid. Alginate is the most commonly used irreversible hydrocolloid for preliminary impressions due to its low cost, ease of use, and ability to provide good surface detail. However, alginate impressions are susceptible to dimensional changes from imbibition or syneresis if not properly stored. Compound is a thermoplastic material that is inexpensive but has poor dimensional stability and flow. Proper technique such as cooling the impression is important when using compound to reduce distortion.
Heat cure acrylic
The document discusses heat cure acrylic denture base resins. It provides background on the development of denture base materials over time. Polymethyl methacrylate (PMMA) was introduced in 1937 and remains the material of choice due to its superior esthetics, ease of processing, accurate fit, and use with inexpensive equipment. The document describes the composition, chemical basis of polymerization, manipulation techniques including compression molding and injection molding, and physical properties of heat cure acrylic resins. It also compares heat cure resins to self-cure resins and discusses requirements versus clinical performance as well as recent advances in the material.
Fundamentals in tooth preparation .
The document discusses the fundamentals of tooth preparation. It defines tooth preparation as the mechanical alteration of a tooth to receive a restorative material. The objectives are to remove defects, extend restorations conservatively, form preparations to resist fracture under force and allow for esthetic and functional placement of material. Key terminology includes walls, angles, and classifications of different types of restorations. The stages of initial preparation establish outline and resistance form, while final preparation focuses on secondary features, finishing, and cleaning.
Denture base materials
This document discusses denture base materials, specifically acrylic resins. It begins by defining denture base and classifying denture base resins as non-metallic, metallic, temporary or permanent. Ideal requirements of dental resins are listed. Composition and differences between heat cure and self cure acrylic resins are provided. Processing techniques like compression molding and the curing cycle are described. Other resin types like light activated are also mentioned. Common processing errors in acrylic resins like porosity, crazing and warpage are listed.
Composite resin
Composite materials are made of a resin matrix and filler particles. They have superior properties to their individual components. There are several types of composites classified by filler particle size: macrofilled (8-12 μm), small particle (1-5 μm), microfilled (0.04-0.4 μm), and hybrid (1 μm). Macrofilled composites have the largest particles and produce the roughest surfaces, while microfilled composites have the smallest particles and smoothest surfaces. Hybrid composites have a mixture of particle sizes. The different types have various indications for use depending on their mechanical properties and ability to be polished.
Glass ionomer cement
Introduction
Classification
Composition
Properties Of GIC
Clinical Application Of GIC & GIC In Endodontics
Contraindication Of GIC
Types Of GIC
Recent Advances
Conclusion
References.
PRIMARY & SECONDARY IMPRESSION IN CD.ppt
1. A complete denture impression is a negative registration of the entire denture bearing, stabilizing and border seal areas in the edentulous mouth. It involves making a preliminary impression to create a custom tray, followed by border molding and the final impression.
2. Key areas to capture in the impression include the hard palate, tuberosities, residual ridges, and relief areas like the incisive foramen. For the mandible, the buccal shelf, retromolar pad, and mental foramen are important.
3. The main objectives of impression making are support, retention, stability, aesthetics, and preserving the alveolar ridges to fabricate dentures that fit well
Impression materials
The document discusses dental impression materials. It provides details on the classification, composition, properties, manipulation and applications of various impression materials including alginate, agar, impression compound, zinc oxide eugenol and silicone impressions materials. Impression materials are classified based on their setting mechanism and elasticity into rigid or elastic materials that set via a chemical reaction or temperature change. The document describes the key ingredients, setting reactions, advantages and disadvantages of different impression materials.
Stock trays
This document discusses stock trays used in dental impressions. Stock trays come in various materials like metal or plastic and have parts like a handle and flanges. They must be rigid but not too thick and simulate the finished denture. The borders should be smooth, rounded, and end 2mm short of the vestibular depth. Stock trays come in perforated for alginate or non-perforated for compound, and different shapes for dentulous or edentulous patients. Adhesives are needed to ensure impression materials firmly adhere to stock trays, like resin solutions for alginates.
Casts, dies and cast forming
This document discusses various materials and methods used for making casts and dies in prosthodontics. It describes the properties required for casts such as being void-free and distortion-free. Common materials used include dental stone/gypsum and alternatives like resins. Methods covered include wax boxing, dental plaster boxing, and caulking compound boxing for final impressions. The properties of dental stone like setting expansion, setting time and compressive strength are also outlined. Different types of casts like diagnostic, working and refractory casts are defined.
Casting procedures
This document outlines the steps in the lost wax casting procedure for dental restorations. It begins by introducing lost wax casting and describing the key steps: 1) Wax pattern removal, 2) Spruing, 3) Investing, 4) Burnout, 5) Casting. It then provides details on wax patterns, sprue formers, crucible formers, casting rings, and the investing procedure. Important considerations for each step are highlighted to produce an accurate casting.
Clasps
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
procedure for amalgam restoration
The document provides information on the procedure for amalgam restoration. It discusses the appropriate mercury to alloy ratio, which is typically 1:1. It describes the steps of trituration to mix the alloy and mercury using either hand mixing or mechanical mixing. Proper trituration is important to coat the alloy particles. The document also outlines the steps for condensing the amalgam into the cavity preparation using incremental layering and discusses carving and polishing the final restoration.
Dental amalgam
Dental amalgam is an alloy used as a dental restorative material. It consists of mercury combined with other metals like silver, tin, and copper. Amalgam undergoes a setting reaction when mixed with liquid mercury to form a hard material. It is indicated for restoring cavities. While it has advantages like strength and cost-effectiveness, it lacks esthetics and can release low levels of mercury vapor. Modern amalgams have improved properties like reduced creep and shrinkage. Careful manipulation is required to achieve optimal physical properties and reduce risks.
Articulator
The document defines an articulator as a mechanical device that represents the temporomandibular joints and jaw members to attach dental casts and simulate jaw movements. Articulators are used to hold dental casts in a fixed relationship, simulate jaw movements like opening and closing, and reproduce border and intra-border tooth movements. They allow dentists to visualize occlusion, plan treatments, fabricate restorations, and arrange artificial teeth by simulating jaw movements without needing patient cooperation. Common components of articulators include upper and lower members to hold the casts, an incisal guide table, condylar guidance, and incisal pin to maintain relationships during jaw simulation. Articulators can be classified based on the occlusion theory they follow, the
maxillary anatomical landmarks
This document provides an overview of anatomical landmarks in the maxilla that are important for complete denture construction. It discusses intraoral landmarks like the labial and buccal frenums, as well as maxillary arch structures like the residual alveolar ridge, hard palate, palatal rugae, incisive papilla, hamular notch, maxillary tuberosity, and fovea palatinae that serve as stress bearing or relief areas. The document emphasizes understanding the histology and functions of these structures to ensure dentures are designed and placed to avoid placing undue pressure on supporting tissues.
Primary impression
An impression in complete dentures is a negative registration of the denture bearing areas made of a material that sets in the mouth. There are different types of impressions based on theories, techniques, trays, and materials used. The objectives of making an impression are to preserve remaining structures, provide retention, stability, support and esthetics. A stock or custom tray is used depending on needs, and materials must be dimensionally stable and reproduce anatomical details accurately.
Cavity liners and_bases_2
Liners and bases are placed between dentin (or pulp) and a restoration to provide pulpal protection. Liners are thin layers that provide a barrier against residual reactants and oral fluids penetrating between the restoration and tooth. Bases are thicker (1-2mm) and provide additional thermal protection and support restoration forces. The need for liners depends on the restoration material and cavity location/depth. Newer liners focus on chemical protection through sealing and adhesion rather than pulpal medication. The choice of liner depends on remaining dentin thickness and restoration material.
Gypsum products
This document discusses different types of gypsum products used in dentistry, including dental plaster, stone, and improved stone. It describes the differences between these products in terms of their crystal structure, density, strength, and setting properties. Dental plaster is the most porous and weakest, while improved stone has the densest and strongest crystals. The document also explains how the setting times and strengths of gypsum products can be modified by adjusting the water-powder ratio or adding chemicals during mixing.
Kennedy’s Classification in Cast Partial Denture
This document discusses Kennedy's classification system for partially edentulous arches and Applegate's rules for applying the Kennedy classification. It provides details on Kennedy's four basic classes for partial edentulism and Applegate's eight rules to govern the application of Kennedy's classification. Examples are given to demonstrate how to use Kennedy's classification and Applegate's rules to classify different clinical scenarios of partial edentulism.
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The document discusses different types of impression trays used in dentistry. It defines impression trays as devices that carry, confine and control impression material in the mouth. The key types discussed are stock trays, which are pre-made and reusable, and custom trays, which are fabricated for a specific patient based on a preliminary cast. Stock trays come in various sizes and materials, while custom trays provide a better fit and less impression material is needed. The document provides details on selecting and fabricating different types of impression trays.
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Dental impression materials are used to create negative replicas of oral structures that are then used to produce positive models. There are several types of impression materials classified by their setting properties and uses. Alginate is the most commonly used elastic impression material due to its ease of use and ability to accurately capture detail. It works well for impressions in mouths with undercuts or excess saliva. Alginate must be mixed properly and used within a short working time to achieve accurate impressions. Rigid materials like impression compound and zinc oxide eugenol paste are suitable for edentulous impressions where reproduction of fine details is not essential.
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Impression trays are used to hold impression material to create a negative likeness of the teeth and surrounding structures. There are two main types - stock and custom trays. Stock trays are prefabricated in various sizes while custom trays are fabricated based on an initial impression to accurately capture detail. Characteristics like perforations help ensure proper adhesion and distribution of impression material. Custom trays are particularly useful for secondary impressions to produce a detailed working model. The evolution of impression materials has facilitated easier impression making through varied tray designs tailored for specific clinical scenarios and anatomies.
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Impression trays are devices used to carry, confine, and control impression material in the mouth. There are two main types: special trays which are custom-made for individual patients and used for final impressions, and stock trays which come in various pre-formed sizes and shapes and are used for primary impressions. Impression trays must be rigid, dimensionally stable, smooth, and able to support the set impression material when removed from the mouth. They are classified based on their fabrication method, arch, presence of teeth, and materials used.
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The final impression techniques aim to accurately record the supporting structures to construct a removable partial denture (RPD) that maximally distributes forces. There are two main techniques - the anatomic form impression records tissues at rest using stock or custom trays with alginate or rubber base. The physiologic form impression records tissues under load using selective pressure techniques. Key objectives are maximum ridge coverage, distributing forces over large areas, and relating supporting structures under function. Custom trays are made with wax spacers and stops to provide uniform impression material thickness. Impressions are inspected before pouring with stone plaster to produce a master cast for RPD framework construction.
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3. hand out
Stock impression trays are used to make preliminary impressions for diagnostic casts. There are various types of stock trays including plastic perforated trays and metal rim-lock trays. Preliminary impressions aim to preserve residual ridges and provide support, stability, aesthetics and retention. Common materials used are alginate, impression compound and elastomer putties. Diagnostic casts are then made from the impressions, typically using dental plaster or stone. The casts are used for diagnosis and custom tray fabrication.
Impression making is an “Ideal impression must be in mind of the dentist bef...
Impression making is an
“Ideal impression must be in mind of the dentist before it is in his hand. He must literally make the impression rather than take it”
special tray in complete denture
This document describes the process of making a special tray for complete dentures. It begins by defining an impression tray and describing the types, which are stock trays and custom/special trays. Special trays are fabricated on a patient's cast, making them a better fit than stock trays. The document then covers the advantages of special trays, materials used to make them, ideal requirements, and the step-by-step process to fabricate a special tray, including identifying the peripheral extension, model preparation, adapting spacer wax, applying a separating medium, constructing the tray base, and adding a handle.
"PERIODONTAL- INSTRUMENTS AND INSTRUMENTATION"
The document provides an overview of periodontal instruments and their classification and uses. It discusses the different types of instruments used for assessment and therapeutic purposes, including probes, explorers, scalers, curettes, files and surgical instruments. Curettes are described in more detail, including universal curettes and area-specific Gracey curettes. The key parts and materials of instruments are also outlined.
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This document discusses impression materials and techniques. It defines impression materials and lists their key properties, such as accuracy, elasticity, and dimensional stability. Impression materials are classified based on their setting mechanism and elasticity. Rigid materials discussed include impression plaster and zinc oxide eugenol paste. Elastic materials include alginate hydrocolloids and elastomeric polymers. The document also covers manipulation techniques for different impression materials.
presentation13-140529134820-phpapp01.pdf
This document describes various dental instruments used for amalgam fillings. It lists and defines mirrors, tweezers, probes, mortar and pestle, amalgam guns, cement spatulas, excavators, dycal applicators, carvers, burnishers, condensers, wedges, and plastic instruments. It also discusses the steps of an amalgam filling including examination, cavity preparation, matrix band application, lining, alloy-mercury mixing, amalgam dispensing, condensation, burnishing, carving, finishing, and polishing. Finally, it defines dental cavity classifications and materials like gypsum, plaster, and die stone.
Dental instruments
This document describes various dental instruments used for amalgam fillings. It lists and defines mirrors, probes, tweezers, mortar and pestle, amalgam guns, matrices, wedges, condensers, burnishers, carvers and other tools. It explains their purposes in examining teeth, preparing cavities, applying linings and matrices, mixing amalgam, condensing the filling, carving and finishing the restoration. Various cavity types and materials like GIC, calcium hydroxide and amalgam alloy+mercury are also defined. Key steps in the amalgam filling process like examination, cavity preparation, lining, mixing, condensation and carving are summarized.
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Impression philosophies for completely edentulous patients
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Impression making is an “Ideal impression must be in mind of the dentist bef...
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Impression Trays (PPT).pptx
- 1. Impression Trays DR SRINIVAS REDDY MDS DEPT OF PROSTHODONTICS NAVODAYA DENTAL COLLEGE
- 2. Definition is a device used to carry, confine & control the impression material from the patient's mouth. During impression making the tray facilitate insertion & removal of impression material from the patient's mouth.
- 3. Requirements Of Impression Trays 1. The tray should be rigid and strong but not too thick. 2. The tray should simulate the finished denture in size and shape. 3. The border extension of the tray should be 2mm short of the vestibular depth with no interference with muscle or frenal attachment. 4. The entire borders of the tray should be smooth and rounded. 5. The tray should retain its shape throughout the impression procedure and pouring of impression. 6. The handle of the tray should be angulated.
- 5. Types of Impression Trays Impression trays can be of various types: 🠶 1. According to the material used to fabricate the trays: a. Metallic trays (stainless steel, Aluminum) b. Non-metallic trays (plastic trays, acrylic resin trays)
- 6. 1. According to the method of fabrication of trays: 🠶 A. Stock trays: - Full arch trays - Sectional trays - Quadrant trays 🠶 B. Custom trays or Special trays
- 7. 3. According to the teeth present /absent in mouth: a. Edentulous trays b. Dentulous trays
- 8. How can I identify between Dentulous and Edentulous trays? Dentulous Trays – SquareCross-SectionFor patientswithteeth! Edentulous Trays – RoundedCross-Section For patientswithout teeth!
- 9. 4. According to the method of interlocking of material: a. Perforated trays b. Non-perforated trays c. Rim-lock trays i. Water-cooled ii. Non water-cooled
- 10. What is the difference between Stock trays and Custom trays? 🠶 STOCK TRAYS- Stock trays are ready-made and comes in specific sizes. Sostocktrays must be selected for best fit. They are re-useable after sterilization. 🠶 CUSTOM TRAYS Custom trays are fabricated on the particular patient’s cast thereby making it unique to the patient. This is why custom trays always are a better fit than stock trays. They are useful only for the particular patient- then discarded.
- 11. Stock Trays
- 12. Definition Impression tray that serve to carry the impression material to the mouth & support it in the correct position while it is hardening. This type of the trays can be used for several patients & used for making primary impression. They are made of different materials such as Al, Tin, Brass or Plastic, in variety of shapes, size to fit different mouth.
- 13. Factors effect in selection of stock tray: 1- The type of material used in the primary impression procedure. e.g. impression compound we used non-perforated tray, because it will be stick on the tray. And if we use alginate material we should use perforated stock tray. 2- Size of the arch. 3- Form of the arch. (round , square , taper ). 4- The stock tray must covered all the anatomical landmarks needed in complete denture & this is a most important point. 5- Stock tray should give a sufficient space to impression material in all direction.
- 14. Metal Trays Properties • Provide maximum support for impressionmaterials •Rigid •Durable and long lasting •Can be perforated or solid •Can be used with all elastometric materials
- 16. Plastic Trays Properties • Disposable • Eliminate cross-contamination • Can be modified • Rigid,thick walls to provide lateral support for the tray impression material to prevent distortion when pouring the model
- 18. What type of stock tray should I use? Stock Trays are always selected to the best fit. This selection is based on - 🠶 The type of mouth you want to make an impression of- 🠶 Dentulous Mouth – use DentulousTrays. 🠶 Edentulous – use EdentulousTrays. 🠶 Partially Edentulous – use CombinationTrays. 🠶 Type of impression material you want to use. 🠶 Elastic Impression Materials – generally use Perforated trays. 🠶 Inelastic materials – generally use Non-Perforatedtrays.
- 19. Custom Trays
- 20. Definition An individualized impression tray made from a cast recovered from primary impression. It is used in making a final impression. Primary Impression Preliminary Cast Special Tray Final Impression
- 21. Advantages of special trays: 1- Economy in impression material ( used less impression material required in special tray). 2- More accurate impression. 3Special tray provides even thickness of impression material. This minimize tissue displacement & dimensional changes of impression material. 4 The work with special tray is more easier & quicker than modifying stock tray to provide accurate impression. 5Special tray is more accurately adapted to the oral vestibules, this helps in better retention of denture. 6 Special tray are less bulky than stock tray which is more comfortable for the patient.
- 22. Materials used for construction of special tray: Non-Metallic Metallic Cast or Swaged Metal (Time Consuming) (Not popularly used) Resin 1. Cold cure acrylic resin 2. Hot resin crylic 3. Light cure acrylic resin Thermoplastic Material 1. Shellac base plate 2. Impression compound
- 23. Types of Custom Tray 🠶Close-fit Tray 🠶Tray with spacer and stop SPACER (WAX) (Openings in the wax where acrylic will flow in to form stops)
- 24. Sterilizing trays 🠶 Trays should be cleaned properly and sterilized before use 🠶 Disposable trays are recommended 🠶 Sterilization can be achieved by autoclaving, dry heat or chemical vapors
- 25. Thank You