RPD LAB CHAPTER 1 INTRO AND KENNEDY

RPD

Are dental prostheses designed to replace missing teeth and can be remived by the patient

Restores function

Maintains oral health by preventing unwanted tooth

Provide cost-effectiveness treatment compared to fixed prostheses or implants

Purpose of RPD

Chewing

speech

aesthetics

Function of RPD

• Long span edentulous area

• No abutment tooth posterior to the edentulous space

• Reduced periodontal support for remaining teeth

• Need for cross-arch stabilization

• Excessive bone loss within the residual ridge

• Immediate need to replace extracted teeth

• Patient desires

• Unfavorable maxillomandibular relationships

Indications for RPD

Edentulous ridge

Residual bony ridge left after tooth extraction

Abutment tooth

Natural tooth that supports ir retains the prosthesis

Framework

Metal structure of the RPD that supports other components

Major Connector

Connects the parts of one side of the dental arch to those of the other side. 

minor connector

Connects other components to the major connector

Provide unification and rigidity to the denture

Function of both major and minor connector

Direct retainer

Provided retention against disloging forces

clasp or clasp unit

Direct retainer is commonly known as

Rest

Retentive arm

Reciprocal arm

minor connnector

Four elemets of DIRECT RETAINER

Indirect Retainer

Unit of Class I and II that prevents movement or rotation of the base away from the residual ridge

REST

Component of INDIRECT RETAINER

Denture base

Covers the resiual ridges and supports the denture teeth

• Allow visualization of the type or partially edentulous arch being considered.

• Permit differention between tooth-supported and tooth-tissue supported partial dentures

• Serve as guide of the type of design to be used.

• Universally accepted

Classification system to be acceptable should be

Class I

Most common kennedy class

Class IV

Least common kennedy class

Bilateral edentulous area located posterior to the remaining natural teeth

Describe Class I

Unilatereal edentulous area located posterior to the remaining natural teeth

Describe Class II

Unilateral edentulous area with natural teeth both anterior and posterior to it

Describe Class III

Single, bilateral edentulous area located anterior to remaining natural teeth.

Edentulous space must cross midline

Descibe Class IV

Class 3

Tooth supported

Class 1 and 2

Tooth-tissue supported