RPD LAB CHAPTER 8 PRINCIPLES OF RPD

Denture base

IS the components that rests on the oral mucosa and supports artifical teeth, it transfers fucntional forces to the supporting tissues

Tooth-supported denture base

THis type of denture base has it support directly derives from anterior and posterior abutment tooth

Tooth-tissue supported denture base

THis type of denture base is primarily supported by residual ridge; the terminal abutment tooth serves as secodnary support only

HIgher rate of Ridge resorption

IN tooth tissue supported denture base, it has a higher chance of relining die to?

Kennedy class III

IN tooth supported denture base, what kennedy calss is most assocaited with it?

Kennedy class I and II

In tooth -tissue supported denture base, what kennedy class is it most associated with it?

1.Acrylic resin

2. Metal bases

3. FLexible bases

3 types of denture base

Acrylci resin

THis type of denture base is msot commonly used

Metal bases (usually cast cobalt-chromium)

THis type of denture base is:

-More rigid and durable

-Provides better thermal conductivity

-Less tissue coverage, minimizing soft tissue irritation

Flexible bases(nylon thermopalstics)

THis type of denture base is:

-Lightweight and flexible

-NOt ideal for all cases due to limited adjustability

snowshoe principle

This principle suggest tthat broad coverage furnishes the best support with the least laod per unit area, tis the principle of choice for providing maximum support

-Broader denture base spreads masticatory forces mroe evenly

-This prinicple guides the design of denture bases, particularly in distal extension RPDS, where tissue support is crucial

-Ensures long term preservastion of the residual rdige and reduce risk of tissue irritaiont/ boen resorption

3 Clinical applciation in RPD denture base

1. Stress equalization

2. Physiologic basing

3. Broad stress distribution

In principle of RPD design, what are the 3 philosophies that govern distal extenions design

SImple hinges

In stress equalization, the most commonly used stress directors are called?

Vertical movement

FOr simple hinges, what movement are they desgined to permit

-Support

-Retention

-Stability

-Reciprocation

-Esthetics

5 key parameters of a RPD

ANterior and posterior abutment tooth

In manner of support (1st consideration), What is it for tooth bounded case

PRimarily by the residual ridge; secondarily the terminal abutment tooth

In manner of support (1st consideration), What is it for tooth tissue supported prosthesis

anatomic form (Static form) of oral structures (abutment tooth and residual ridge)

IN method of impression registration and the jaw record (2nd consideration), What is it for Tooth bounded cases

Functional form (under pressure) of the primary supporting structure (residual ridge)

IN method of impression registration and the jaw record (2nd consideration), What is it for tooth tissue supported prosthesis

NO need retention

In the need of indirect retention (3rd consideration ), what is it for tooth bounded cases

Placement of 1-2 indirect retainers

In the need of indirect retention (3rd consideration ), what is it for tooth tissue supported prosthesis

Metal base( due to not relining necessary)

In the use fo a dentreu base material(4th cosndieration) , what is it for tooth bounded cases

Acrylic resin base (due to relining)

In the use of a denture base material(4th consideration), what is it for tooth issue supported prosthesis

In requirements of direction retention (5th considertion), what is it for

Flat ridge

this form of residual ridge provide good support, poor stabiltiy

SHarp spiny ridge

This form of residual ridge will provide poor support, poor to fair stability

Displaceable tissue

THis part on the ridge will provide poor support and poor stability