- Distal extension removable partial dentures depend on the residual ridge for support since they do not have full tooth support.
- Several factors influence the support provided by the residual ridge, including its contour, the extent of coverage by the denture base, impression accuracy, fit of the denture base, framework design, and occlusal load.
- The ideal residual ridge for support would have dense cortical bone covering cancellous bone with a broad, rounded crest and sloping sides covered by dense tissue.
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.
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.
When treating a patient with a removable partial denture, the natural and artificial teeth, both functionally and esthetically, must co-exist in a harmonious relationship.
Occlusal harmony between a removable partial denture and the remaining natural teeth is a major factor in preservation of the surrounding structures.
In removable partial dentures, because of the attachment of the denture to abutment teeth, occlusal stresses can be transmitted directly to the abutment teeth and other supporting structures, which results in sustained stresses that may be more damaging than those transient stresses found in complete dentures.
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.
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.
When treating a patient with a removable partial denture, the natural and artificial teeth, both functionally and esthetically, must co-exist in a harmonious relationship.
Occlusal harmony between a removable partial denture and the remaining natural teeth is a major factor in preservation of the surrounding structures.
In removable partial dentures, because of the attachment of the denture to abutment teeth, occlusal stresses can be transmitted directly to the abutment teeth and other supporting structures, which results in sustained stresses that may be more damaging than those transient stresses found in complete dentures.
this presentation has all the techniques in impression making in the fabrication of an RPD.
The presentation is available on request. Mail me at apurvathampi@gmail.com
this presentation has all the techniques in impression making in the fabrication of an RPD.
The presentation is available on request. Mail me at apurvathampi@gmail.com
Retention and support in removable partial denture kalpanaKumari Kalpana
Retention of a removable prosthesis is a unique concern when compared with other prosthesis. Forces acting to displace the prosthesis from the tissue can consist of gravity acting against a maxillary prosthesis, the action of adherent foods acting to displace the prosthesis on opening of the mouth in chewing, or functional forces acting across a fulcrum to unseat the prosthesis.
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.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
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http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Ethnobotany and Ethnopharmacology:
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2. Distal Extension Removable Partial
Denture
• The distal extension removable partial
denture does not have the advantage of total
tooth support because one or more bases are
extensions covering the residual ridge distal
to the last abutment. Therefore is dependent
on the residual ridge for a portion of its
support.
3. • The distal extension removable partial
denture must depend on the residual ridge for
some support, stability, and retension.
• Indirect retension, to prevent the denture
from lifting away from the residual ridge,
should also be incorporated in the design.
4. Factors Influencing Support of a Distal Extension
Base
Support from the residual ridge becomes more important
as the distance from the last abutment increase and will
depend on the following several factors:
1. Contour and quality of the residual ridge.
2. Extend of residual ridge coverage by the denture base.
3. Type and accuracy of the impression registration.
4. Accuracy of the fit of the denture base.
5. Design of the removable partial denture framework.
6. Total occlusal load applied.
5. Contour and Quality of the Residual Ridge
• The ideal residual ridge to support a denture base
would consist of cortical bone that covers
relatively dense cancellous bone, with a broad
rounded crest with high vertical slopes, and is
covered by firm, dense, fibrous connective tissue.
• Such a residual ridge would optimally support
vertical and horizontal stresses placed on it by
denture bases.
6. • Easily displaceable tissue will not adequately
suport a denture base, and tissues that are
interposed between a sharp, bony residual
ridge and a denture base will not remain in a
healthy state.
• Crest of the bony mandibular residual ridge is
most often cancellous therefore cannot be a
primary stress bearing area.
• Buccal shelf area seems to be better suited for
the primary stress bearing area.
7. • Slopes of residual ridges …… primary stress
bearing region for resistance of horizontal and
off-vertical forces.
8.
9. • Immediate crest of the bone of the maxillary
residual ridge may consist primarily of
cancellous bone.
• The crestal area of the residual ridge will
become the primary stress bearing area to
vertically directed forces.
• Some resistance may be obtained by the
immediate buccal and lingual slopes of the
ridge.
10. • Palatal tissues between the medial palatal
raphe and the lingual slope of the posterior
edentulous ridge are readily displaced and
cannot be considered as primary stress
bearing areas.
11.
12. Extent of Residual Ridge Coverage by
Denture Base
• The broader the residual ridge coverage the
greater is the distribution of the load …..
((the greater is the distribution of the load,
which results in less load per unit area)).
• “ maximum coverage of the denture-bearing
areas with large, wide denture bases is of
utmost importance in withstanding both
vertical and horizontal stresses” kaires
.
13. A-B : Comparison of two removable partial dentures for the same patient.
The denture on the right has severely underextended bases. Its
replacement, with properly extended bases, is on the left. Occlusal
forces are more readily distributed to denture-bearing areas by the
replacement denture.
14. Types and Accuracy of Impression
Registration
Residual Ridge
Anatomical Form
• surface contour when it not supporting an
occlusal load .
Functional Form
• When the ridge is supporting a functional
load.
15. Accuracy of the Fit of the Denture
Base
• Support of the distal extension base is
enhanced by intimacy of contact of the tissue
surface of the base and the tissues that cover
the residual ridge.
• The tissue surface must optimally represent a
true negative of the basal seat regions.
16. Design of the Removable Partial
Denture Framework
• Some rotation movement of the distal extension
base at the distal abutment is inevitable under
functional loading.
• The greatest movement takes place at the most
posterior extent of the denture base.
Retromolar pad of the mandibular residual ridge.
Tuberosity region of the maxillary residual ridge.
17. • As the rotational axis is moved from a disto-
occlusal rest to a more anterior location,
more of the residual ridge receives vertically
directed occlusal forces to support the
denture base.
18. • Occlusal rest may be moved anteriorly to better
use the residual ridge for support without
jeopardizing either vertical or horizontal support
of the denture by occlusal rest and guiding
planes.
If rotation of the distal extension base occurs around the nearest rest, as the rest is
moved anteriorly more of the residual ridge will be used to resist rotation. Compare the
vertical arcs of the long-dash broken line with the arcs of the solid line.
19. Total Occlusal Load Applied
• Patients with distal extension removable partial dentures
generally oriented the food bolus over natural teeth rather
than prosthetic teeth.
• More stable nature of the natural dentition, the
proprioceptive feedback it provides for chewing, and the
possible nocioceptive feedback from the supporting
mucosa.
• This has an effect on the direction and magnitude of the
occlusal load to the removable partial denture, and thus on
the load transferred to the abutments.
• The number of artificial teeth, the width of their occlusal
surfaces, and their occlusal efficiency influence the total
occlusal load applied to the removable partial denture.
20. Impressions
Anatomic Form Impression
• One stage impression using an elastic
impression material that does not represent
the functional relationship between various
supporting structures of the partially
edentulous mouth.
• Only represent hard and soft tissues at rest.
21. • A partial denture fabricated from a one stage
impression, places more of the masticatory
load on the abutment teeth and that part of
the bone that underlies the distal end of the
extension base.
• Effects:
Traumatic load to the underlying bone
Bone loss and loosening of abutment tooth.
22. Selective Tissue Placement
Impression Method
• The goal is to maximize soft tissue support
while using the teeth to their supportive
advantage, the framework fitted to the teeth
while soft tissue support is registered provides
a means of coordinating both.
• A secondary impression for the distal
extension mandibular removable partial
denture is made in individual trays attached to
the denture framework.
23. The framework must be evaluated to assure complete seating, full contact with the remaining dentition for stabilization, support, and
retention as planned, and to allow full natural tooth contact. A, Several types of disclosing media may be used, such as stencil
correction fluid, rouge, and chloroform, and disclosing fluids, pastes, and waxes. Here, a spray disclosing medium has been applied
and the framework is placed with mild pressure. Incomplete seating is seen when the framework binds. It is imperative that the
framework not be forced to place at this initial seating. B, A portion of the proximal plate is preventing complete seating. C, The
framework is carefully adjusted as over-adjustment can result in a poorly adapted framework. D, The framework seats
completely after adequate adjustment. This may require repeated disclosing and careful adjustment; however, if improvement is
not seen with each framework modification there should be concern regarding frame accuracy. E, Following complete seating and
verification of appropriate tooth contacts by component parts (i.e., rests, proximal plates, stabilizing components) the occlusion
must be checked and the framework adjusted until natural tooth contacts that exist without the framework seated are achieved with
the framework in place. All adjusted regions can be carefully polished with rotary rubber points.
A
B
C
D
E
24. A secondary impression for the distal extension mandibular removable partial denture
is made in individual trays attached to the denture framework. A, The framework has
been tried in the mouth and fits the mouth and master cast as planned.
B, The outline of acrylic-resin trays is penciled on the cast.
25. C, One thickness of baseplate wax is adapted to outlines to act as spacers
so that room for the impression material exists in the finished trays. Windows
are cut in the wax spacers corresponding to regions on the cast contacted by
minor connectors (tissue stops) for denture bases.
D, The framework is warmed and pressed to position on the relieved master
cast. All regions of the cast that will be contacted by autopolymerizing acrylic-
resin or visible light-cured (VLC) resin are painted with tinfoil substitute (Alcote) or
model release agent (MRA).
26. E--- Acrylic-resin material is adapted to
the cast and over the framework with
finger pressure. Excess material over
the borders of the cast is removed with a
sharp knife while the material is still soft.
F--- Polymerized acrylic-resin trays
and framework are removed from the
cast, and trays are trimmed to outline
the wax spacer.
G--- Borders of the trays will be adjusted
to extend 2 mm short of the tissue
reflections. Holes will be placed in the
trays corresponding to the crest of the
residual ridge and retromolar pads to
allow escape of excess impression
material when an impression is made.
27. Selective tissue placement impression technique. A, Tray attached at the frame
try-in, which in B is seen incompletely seated. C, Completed border molding,
which defines the primary bearing areas of the buccal shelves bilaterally. This
bearing area and the lingual extension are seen in the final impression (D), which
can be seen to be in contact with use of the pressure indicating paste (E).
28. Comparison of anatomic and functional ridge forms.
A, Original master cast with the edentulous area recorded in its
anatomic form, using elastic impression material.
B, Same cast after the edentulous area has been repoured to its
functional form as recorded by the secondary impression.
29. Altered Cast Method
• The altered cast method of impression making is
most commonly used for the mandibular distal
extension partially edentulous arch (Kennedy
Class I and Class II arch form).
• A common clinical finding in these situations is
greater variation in tissue mobility and tissue
distortion or displaceability, which requires
some selective tissue placement to obtain the
desired support from these tissues.
30. (A) Occlusal view of a cast from a preliminary impression, which produced an
anatomic ridge form. (B): an altered cast of the same ridge showing a
functional or supportive form The altered cast impression selectively placed
pressure on the buccal shelf region, which is the primary stress-bearing area of
the mandibular posterior residual ridge.