- Record bases help transfer accurate jaw relationships to an articulator to enable setting artificial teeth for a trial denture. They can be temporary or permanent.
- Temporary record bases include shellac, reinforced shellac, cold cure acrylic, and vacuum formed bases. Permanent bases are not discarded and become part of the final denture base, like heat cure acrylic, gold, or cobalt-chromium alloys.
- Occlusion rims are built on record bases to make jaw relation records and arrange teeth. They must be in the anticipated tooth position, securely attached to the base, and have a smooth, flat occlusal surface that supports lips and cheeks.
MANDIBULAR ANATOMICAL LANDMARKS
PRESENTED BY
ROSHALMARIA THOMAS
IV/II
THE ANATOMY OF EDENTULOUS RIDGES IN THE MAXILLA AND MANDIBLE IS VERY IMPORTANT FOR THE DESIGN OF THE COMPLETE DENTURE
THE TOTAL AREA OF SUPPORT FROM THE MANDIBLE IS SIGNIFICANTLY LESS THAN FROM THE MAXILLA.
THE AVERAGE AVAILABLE DENTURE BEARING AREA FOR AN EDENTULOUS MANDIBLE IS 14cm2 , WHEREAS FOR EDENTULOS MAXILLA IT IS 24cm2. THEREFORE THE MANDIBLE IS LESS CAPABLE OF RESISTING OCCLUSAL FORCES THAN THE MAXILLA.
Labial frenum
Fibrous band
Muscles incisivus and orbicularis oris
Active
Labial vestibule
Space between residual alveolar ridge and lips
Length and thickness of labial flange-influences lip support and retention
Buccal frenum
Overlies depressor anguli oris
Fibers of buccinators attached
Buccal vestibule
Extends- posteriorly from buccal frenum to retromolar pad region
Residual alveolar ridge on one side and buccinators on other
Influenced by action of masseter
Lingual frenum
Should be relieved
High lingual frenum is called tongue tie –affects stability
Alveololingual sulcus
Extends from lingual frenum to retromylohyoid curtain
Divided into 3 parts- anterior, middle and posterior
Anterior region- from lingual frenum to premylohyoid fossa
Flange is shorter anteriorly and should touch the floorof the mouth whentip of tongue touches upper incisors
Middle- extends from premylohyoid fossa to distal end of mylohyoid ridge
Shallower due to prominence of mylohyoid ridge and action of mylohyoid muscle
Posterior- retromylohyoid fossa
Typical S form of lingual sulcus
Retromolar pad
Posterior seal of mandibular denture
Pear shaped
Triangular keratinized soft pad of tissue at distal end of ridge
Bounded posteriorly by tendons of temporalis, laterally by buccinators and medially by pterygomandibular raphe and superior constrictor
Denture should extend one half to two thirds of retromolar pad
Buccal shelf area
Area between buccal frenum and anterior border of masseter
Width increases as resorption continues
Lies at right angles to occlusal forces- primary stress bearing area
Residual alveolar ridge
Edentulous mandible may become flat with concave denture bearing surface
In such cases, structures attaching on lingual side of ridge attach over the ridge
Due to resorption mandible inclines outwards and becomes progressively wider
Mylohyoid ridge
Runs along lingual surface of mandible
Anteriorly lies close to inferior border of mandible, posteriorly lies flush along the ridge
Thin mucosa- easily traumatized- hence should be relieved
Undercut present under the ridge
Mental foramen
Between first and second premolar region
Relieved- as pressure may cause paresthesia
Genial tubercles
Pair of bony tubercles
Present anteriorly on lingual side of body of mandible
Due to resorption may become increasingly prominent- denture usage difficult
MANDIBULAR ANATOMICAL LANDMARKS
PRESENTED BY
ROSHALMARIA THOMAS
IV/II
THE ANATOMY OF EDENTULOUS RIDGES IN THE MAXILLA AND MANDIBLE IS VERY IMPORTANT FOR THE DESIGN OF THE COMPLETE DENTURE
THE TOTAL AREA OF SUPPORT FROM THE MANDIBLE IS SIGNIFICANTLY LESS THAN FROM THE MAXILLA.
THE AVERAGE AVAILABLE DENTURE BEARING AREA FOR AN EDENTULOUS MANDIBLE IS 14cm2 , WHEREAS FOR EDENTULOS MAXILLA IT IS 24cm2. THEREFORE THE MANDIBLE IS LESS CAPABLE OF RESISTING OCCLUSAL FORCES THAN THE MAXILLA.
Labial frenum
Fibrous band
Muscles incisivus and orbicularis oris
Active
Labial vestibule
Space between residual alveolar ridge and lips
Length and thickness of labial flange-influences lip support and retention
Buccal frenum
Overlies depressor anguli oris
Fibers of buccinators attached
Buccal vestibule
Extends- posteriorly from buccal frenum to retromolar pad region
Residual alveolar ridge on one side and buccinators on other
Influenced by action of masseter
Lingual frenum
Should be relieved
High lingual frenum is called tongue tie –affects stability
Alveololingual sulcus
Extends from lingual frenum to retromylohyoid curtain
Divided into 3 parts- anterior, middle and posterior
Anterior region- from lingual frenum to premylohyoid fossa
Flange is shorter anteriorly and should touch the floorof the mouth whentip of tongue touches upper incisors
Middle- extends from premylohyoid fossa to distal end of mylohyoid ridge
Shallower due to prominence of mylohyoid ridge and action of mylohyoid muscle
Posterior- retromylohyoid fossa
Typical S form of lingual sulcus
Retromolar pad
Posterior seal of mandibular denture
Pear shaped
Triangular keratinized soft pad of tissue at distal end of ridge
Bounded posteriorly by tendons of temporalis, laterally by buccinators and medially by pterygomandibular raphe and superior constrictor
Denture should extend one half to two thirds of retromolar pad
Buccal shelf area
Area between buccal frenum and anterior border of masseter
Width increases as resorption continues
Lies at right angles to occlusal forces- primary stress bearing area
Residual alveolar ridge
Edentulous mandible may become flat with concave denture bearing surface
In such cases, structures attaching on lingual side of ridge attach over the ridge
Due to resorption mandible inclines outwards and becomes progressively wider
Mylohyoid ridge
Runs along lingual surface of mandible
Anteriorly lies close to inferior border of mandible, posteriorly lies flush along the ridge
Thin mucosa- easily traumatized- hence should be relieved
Undercut present under the ridge
Mental foramen
Between first and second premolar region
Relieved- as pressure may cause paresthesia
Genial tubercles
Pair of bony tubercles
Present anteriorly on lingual side of body of mandible
Due to resorption may become increasingly prominent- denture usage difficult
An introductory and simple guide assembled by dental students and reviewed by Dr. Hasannin Al-Namel. our seminar about impression trays used in prosthodontics
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
A number of theories have been put forward for impressions. each having its own advantage and disadvantage.
Different spacers guide and aid in in making the desired impression with adequate pressure in the desired region of the arch in maxilla and mandible. different materials are used for spacers depending on the need.
all the techniques used in completedenture fabrication in condition like flabby tissue and resorbed rigdes plus patients having problem of gag. it includes various pictures and procedure of impression techniques.
Easy way to read dental record base,Details information of re dental cord base, theory of record base
Dental record base notes,
Record base notes Slideshow,
Online notes on record base
Enotes record base,
Dental students all notes
An introductory and simple guide assembled by dental students and reviewed by Dr. Hasannin Al-Namel. our seminar about impression trays used in prosthodontics
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
A number of theories have been put forward for impressions. each having its own advantage and disadvantage.
Different spacers guide and aid in in making the desired impression with adequate pressure in the desired region of the arch in maxilla and mandible. different materials are used for spacers depending on the need.
all the techniques used in completedenture fabrication in condition like flabby tissue and resorbed rigdes plus patients having problem of gag. it includes various pictures and procedure of impression techniques.
Easy way to read dental record base,Details information of re dental cord base, theory of record base
Dental record base notes,
Record base notes Slideshow,
Online notes on record base
Enotes record base,
Dental students all notes
laboratory procedures in make of complete dentureddert
Upload By : Ahmed Ali Abbas
Babylon University College of Dentistry
download this file from Website on google is
theoptimalsmile.wix.com/dentistry
تحميل بقلم: أحمد علي عباس
جامعة بابل كلية طب الأسنان
تحميل هذا الملف من موقع على جوجل
theoptimalsmile.wix.com/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
INTRODUCTION- Removable partial denture: the replacement of missing teeth and supporting tissues with a prosthesis designed to be removed by the wearer-GPT.
Cast partial denture is a type of partial denture comprising a cast metal framework with acrylic resin prosthetic teeth.
Traditional acrylic partial dentures are less durable, retentive, and stronger than cast partial dentures.
history, classification, types of veneers, indications and contraindications, working procedure, preparation, ipmpression taking for veneers, surface treatment and cementation, veneers vs crowns
When appropriately utilised, vital bleaching can be a successful, predictable, minimally invasive and safe way to improve the overall aesthetics of an individual’s smile
Master apical file size – smaller or larger: a systematic review of healing o...Dr. Arbiya Anjum S
In patients with restorable teeth that have had persistent periapical pathosis and/or clinical symptoms, is there an optimal apical enlargement which would result in better microbial reduction?
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
5. Objectives:
-Helps in transfer of accurate jaw relation ships
to an articulator
- To enable the setting of artificial teeth for the
trial denture.
6. MATERIALS & METHODS
-It is generally agreed that
maxillomandibular relations are difficult -
to record accurately.
- Record bases are made of several different
materials.
8. Types of temporary record
bases:
Shellac base plate
Reinforced shellac base plate
Cold cure acrylic resin
visible light cure acrylic resin
Vacuum formed vinyl and polystyrene
Base
9. PERMANENT RECORD
BASES
They are not discarded and become part of the actual
base of the finished complete denture.
TYPES OF PERMANENT RECORD BASES:
.Heat cure acrylic resin
.Gold
.Chromium-cobalt alloy
.Chromium-nickel alloy
10. Shellac base plate
advantages:
-They will adapt to intimate contact with the mastercast.
-Procedure is not time consuming
-cheap
-uniform thickness
-Can be corrected easily by reheating and readapting to the
mastercast.
11. Disadvantages :
Quickly adapted, BUT not considered
satisfactory.
They warp,
do not fit accurately,
distort easily, lack rigidity,
become brittle and break, and will not permit
polishing of the borders
12. SHELLAC
Any undercuts are relieved, and separating medium
is applied to the cast.
The shellac record base forms are manufactured in
the shapes of the maxillary and mandibulararches.
13. The forms are softened with an open flame and
molded to the cast with an instrument or the
fingers.
While the material is in a softened state, the
excess is removed with scissors.
Afterhardening, the borders are smoothed but as
a rule will not take a polish.
15. Disadvantages :
-Base is more rigid and stable than shellac but its still
subject to distortion and breakage.
- It is bulky, the odor and
taste of the paste are objectionable to some patients,
and it is unsuitable for arrangement of teeth
in cases of limited inter arch space.
16. Cold cure acrylic
resin
Advantages:
Good strength no need for reinforcement
Good dimensional stability
Does not wrap during manipulation
Closely fit to the master cast
17. DISADVANTAGES:
.Require more time in fabrication
.Difficult to control the thickness
.Residual monomer can cause
irritation to oral tissues
19. SPRINKLE ON METHOD
.Any undercutsare relieved, and separating medium is
applied to the cast.
.Using an eye dropperapply the monomerto the cast,
carefully add the polymer (salt and pepper technique) until
a sufficient thickness is gained over the entire surface of
the cast.
.The processed base is removed from the cast, smoothed,
and polished at the borders.
20. FINGER ADAPTED DOUGH
METHOD
.Any undercuts are relieved, and separating
medium is applied to the cast.
.The self curing resin is mixed according to
manufacturerinstructions
.When it reach the dough stage, it is molded to the
cast with instrument or fingers.
.It is allowed to polymerized completely.
.The processed base is removed from the cast,
smoothed, and polished at the borders.
21. FLASKING METHOD
.A wax pattern is constructed over the cast
with a thickness and contour desired for
complete denture.
.The cast and pattern are flasked, the wax is
eliminated, acrylic resin is packed and
allowed to set under the pressure of clamps or
press.
.The processed base is removed from the cast,
smoothed, and polished at the borders.
22. VISIBLE LIGHT CURED
ACRYLIC RESIN
Any undercuts are relieved, and
separating medium is applied to the cast.
Adapt a sheet of pink base plate material
to the cast by fingers and prevent
trapping of air.
23. .Extend the material to the depth of vestibule.
.Cure the record base for 4 minutes in the light
cure unit. Carefully removed from the cast,
invert and cure the tissue surface for 4 minutes.
.The processed base is removed from the cast,
smoothed, and polished at the borders
24. Vacuum formed vinyl and polystyrene
Any undercuts are relieved, and separating medium
is applied to the cast.
A sheet of base plate material placed over the cast
and inserted in the vaccum chamber.
Electric heater switched to heat the sheet.
Turn on the vacuum. The sheet will adapt closely
to the cast.
Switch of the heaterand allow the record base to
cool.
Remove the record base and cut the excess material
25. Advantages
.Easy to fabricate
.Uniform thickness
.Accurate adaptation to the .Master cast
.Good rigidity
Disadvantages
.Expensive
.Difficult to form smooth rounded .Borders .
26. BASE PLATE WAX
.Wet the cast
.Soften the base plate wax over the flame
and adapt it to master cast
.Remove the excess wax and make the
borders round and smooth.
27. ADVANTAGES
.Easy and rapid method
.Inexpensive and available
DISADVANTAGES
.It lacks rigidity
.It lacks dimensional stability
28. HEAT PROCESSED ACRYLIC
RESIN
A wax pattern is constructed over the cast
with a thickness and contour desired for
complete denture.
The cast and pattern are flasked, the wax is
eliminated, acrylic resin is packed and heat
processed.
The processed base is removed from the cast,
smoothed, and polished at the borders.
29. ADVANTAGES
They are rigid, accurate, stable, not subject to
distortion, and suitable for arrangement of teeth.
DISADVANTAGES :
Require considerable time, more expensive.
30.
31.
32. DEFNITION
“Occluding surfaces built on temporary or
permanent denture bases for the
purposes of making maxillomandibular
relation records and arranging teeth”
33. REQUIREMENTS
the position should be in the anticipated
position of the artificial teeth.
it must be securely attached to the base.
the occlusal surface must be smooth and flat.
it should be contoured to support the lip and
cheeks accurately.
all the surfaces should be smooth.
34. USES
The occlusion rims are used :
To establish the level of the occlusal plane.
to establish the arch form.
to record the maxillary mandibular relations.
for arrangement of the teeth.
35. FACTORS CONTROLLING THE FORM OF
AN OCCLUSAL RIMS
BASICFACTORS
Relationship of the natural teeth to alveolar bone
Relationship of the occlusal rims to the
edentulous ridge
Standard dimensions used to fabricate an
occlusal rims.
Technique of fabrication
Clinical guidelines
36. RELATIONSHIP OF THE NATURAL
TEETH TO ALVEOLAR BONE
Occlusal rims should be fabricated such that it is
parallel to the long axis of the tooth to be replaced.
The maxillary anteriors are labially inclined,hence,
the occlusal rims in that area should also be
labially inclined .
All the posterior teeth are placed vertically ,hence,
the occlusal rim should also be fabricated vertical
in this region .
37. RELATIONSHIP OF THE OCCLUSAL RIMS
TO THE EDENTULOUS RIDGE
Residual ridge resorption changes the apex of
the edendulous ridge
The occlusal rim should be fabricated such
that the midline of the occlusal plane pases
through the apex of the EDENTULOUS
RIDGE
38. STANDARD DIMENSIONS USED TO
FABRICATE AN OCCLUSAL RIMS.
ARCH ANTERIOR REGION POSTERIOR REGION
HEIGHT WIDTH HEIGHT WIDTH
MAXILLARY 20-22mm
from the
deepest part
of the sulcus
3-5mm 16-18mm
from the
deepest part
of buccal
sulcus in the
molar region
6-8mm
MAND
IBULAR
16-18mm
from the
deepest part
of the sulcus
3-5mm At a level of
the junction
roof the
anterior 2/3rd
& posterior
1/3rd of the
retromolar
6-8mm
50. METAL OCCLUSAL RIM FORMER
Waxisrolledtoacylinderasdescribedinprevioustechnique
Thecylinderofwaxisthenshapedusingmetalocclusalrim
former&storedforlateruse
Thesearelateradapted,sealed&finishedasdescribedearlier
51. PRE-FORMED OCCLUSAL RIM
Readymadeocclusionrim
its supplied as a horse shoe shaped rim, adapt it in
the proper position on the record base.
Softened it slightly, sealed it with the record base
by the aid of a wax knife.
53. Maxillary posterior occlusal plane should be 1/4th inch
below the opening of the stensons duct or parotid duct
Mandibular incisal edge should be at the level of lower
lip & about 2mm behind the maxillary incisal edge
Canine eminence of the lower occlusal rim should be
located at the corner of the mouth
55. Anterior maxillary occlusal plane should be parallel to the inter pupillary
line . the antero-posterior occlusal plane should be parallel t o the ala-
tragus line or the campers line or bromel’s line.