30 Questions
What are the potential problems of Class IV partial denture?
Displacement of the periodontal ligament
Why are anterior teeth usually placed in a less ideal relation to the residual ridge in Class IV partial denture?
To satisfy esthetic demands
What is the major concern with the use of anterior clasp in partial denture design?
Poor esthetics
What is the purpose of using R.P.I or gingivally approaching clasp in partial denture design?
Flexibility and esthetics
What is the recommended major connector for a maxillary partial denture with a free end saddle?
Horseshoe
Where should the indirect retention be placed in a partial denture?
As far posteriorly as possible
What are the educational aims of the lecture on partial denture design?
To explain the principles of partial denture design
What should students understand upon completion of the lecture on partial denture design?
Forces acting on the partial denture and design components
Where are students advised to read details about removable partial dentures?
Removable partial dentures, Nicholas J A Jepson, 2004: Chapter 6
What are the types of RPD according to support?
Tooth Support, Mucosa support, Tooth-mucosa support
What are the possible partial denture movements mentioned in the text?
Tissue-ward movements, Tissue-away movements, Horizontal movements, Rotational movements
What function of the partial denture is called 'Support'?
Vertical forces acting in gingival direction tending to move the denture towards the tissues
What mainly provides the function of 'Support' in partial dentures?
Properly designed supporting rests, Rigid major connectors, Broad accurately fitting denture bases
What are the educational aims of the lecture on Clinical partial prosthodontics?
To explain the principles of partial denture design, To detail the problems related to the design of the partial denture
What is the objective of the lecture on Clinical partial prosthodontics?
To have an understanding of the forces acting on the partial denture and the design components that overcome them
What is the main focus of the lecture on Clinical partial prosthodontics?
Principles of partial denture design and problems related to the design of the partial denture
What provides retention in partial dentures?
Mechanical direct retainers
What can lead to tooth damage and require bracing resistance in partial dentures?
Lateral movements during mandibular function
What do indirect retainers in partial dentures reduce?
Rotational movements in an occlusal direction
What are problems of support in free-end saddle partial dentures due to?
Lack of posterior abutment and reliance on residual ridge support
What does load reduction in partial dentures involve?
Leaving a tooth off the saddle and using narrow teeth bucco-lingually
What does wide load distribution in partial dentures aim for?
Maximum ridge coverage and involving a larger number of teeth as rigid rests
What are the material options for clasps in partial dentures?
Retentive and bracing arms made of wrought metal cast wire and stress breakers using movable joints
What minimizes strain on the residual ridge in prosthodontic design for partial dentures?
Functional impression
What complicates retention in class II partial denture design?
Absence of a saddle
What may be utilized in conventional partial dentures depending on the case?
Rest seats
What is a characteristic of tooth-borne removable prosthesis?
Metal base
What are the problems associated with unilateral partial dentures?
Instability and limited load distribution
What is involved in designing class III partial denture to simplify problems?
Including a modification area for cross arch stabilization
How can strain on the residual ridge be reduced in prosthodontic design for partial dentures?
Harmonious occlusion
Study Notes
Prosthodontic Design Considerations for Partial Dentures
- Placing the occlusal rest away from the distal extension base changes the torque, counteracted by adjacent tooth buttressing effect.
- Anterior placement of occlusal rest disengages the clasp during tissue ward forces, increasing the length of the arc of rotation and support area.
- Functional impression minimizes strain on the residual ridge through broad tissue coverage, denture base fitness, muco-compression impression recording, and improving the ridge condition.
- Strain on the residual ridge is also reduced through the use of small and narrow teeth, harmonious occlusion, and placement of occlusal rests away from the saddle.
- Minimizing strain on abutment teeth involves choosing the correct abutment tooth, direct retainer, stress equalizing design, and placing additional rests.
- Designing class II partial dentures follows the same principles as class I, but the absence of a saddle complicates retention due to lack of posterior support.
- Class II partial dentures can be designed with or without modifications, utilizing rigid clasping, stress equalizing principles, or modification spaces for retention and bracing.
- Class III partial denture problems can be simplified by including a modification area for cross arch stabilization, retention, and support.
- Tooth-borne removable prosthesis characteristics include a metal base, no need for indirect retainer or stress breaking action, and requiring only anatomic impression.
- Conventional partial dentures may utilize rest seats, near zone, retentive clasps, and a metallic or combination denture base, depending on the case.
- Problems of unilateral partial dentures include instability, limited load distribution, and potential aspiration or swallowing.
- Design considerations for unilateral partial dentures involve providing B and L cusp contact, wide occlusal rest, double bracing and retention, and maximum flange extension.
Test your knowledge of prosthodontic design considerations for partial dentures with this informative quiz. Explore topics such as occlusal rest placement, functional impression techniques, abutment tooth selection, class II and class III partial denture design, and characteristics of tooth-borne and conventional partial dentures.
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