removable partial denture

PRESENTED BY Ahmed Ali Abbas

It should permit immediate visualization of the type of partially edentulous arch being considered.

It should permit immediate differentiation between the tooth borne and tooth tissue supported RPD

It should be universally acceptable

Tooth borne Mucosa borne Tooth and mucosa borne

World wide acceptable classification Devised by Edward Kennedy in 1923 When use in conjunction with a support

classification, it helps to give a clear classification understanding about the type of denture under consideration during a discussion on partial dentures.

Kennedy classification is based on the relationship of the saddles to the natural teeth.

1. The most posterior edentulous area determines the class.

2. The size of the modification is not important.

3. If a third molar is missing and not to be replaced it is not considered in determining the class.

Kennedys classification has four main groups with modifications except for class IV

Class I: Bilateral free end edentulous spaces posterior to the natural teeth.

Class II: Unilateral free

end edentulous space

posterior to the natural teeth.

Class III: Abounded unilateral edentulous space having natural teeth at each end.

Class IV: Abounded edentulous space anterior to the natural teeth.

Examples of modifications:An additional edentulous area in Class I would be designated as Class I modification 1If two additional edentulous areas are present it could be designate as Class I modification 2A unilateral saddle with one additional edentulous area is Class II modification 1

A unilateral bounded edentulous area with three additional edentulous areas is class III modification 3

Allows visualization of partially edentulous arch

Differentiates between tooth supported and tooth tissue supported

Type of design can be decided Is universally accepted Aids in discussing identifying and

planning the design

Easy to apply the system to any situation Widely used system Formed the basis for two other systems as

Apllgate Kennedy and Swenson’s system

CUMMERS CLASSIFICATION (1921) CHARLES. W. BAILYN (1928) NEUROHRS CLASSIFICATION FRIEDMANS SYSTEM OSBORNE and LAMMIE

First classification to be recognised by the dental profession

He classified partial dentures than edentulous spaces

Four types1. Diagonal: 2 retainers diagonally opposite

another2. Diametric: 2 retainers diametrically

opposite one another.3. Unilateral: 2 or more direct retainers on

same side.4. Multilateral: 3 direct retainers on either

side.

He emphasized the importance of support for partial dentures.

“A”- Anterior restorations where there were saddle areas anterior to the bicuspids.

“P”- Posterior restorations where there were saddle areas posterior to the canines.

Class I: Bounded saddle (Tooth supported).

Class II: Free end saddle (Mucosa supported).

Class III: Bounded saddle (More than 3 tooth missing).

Example: If all posterior teeth from canines till molars are missing with lateral incisors then the classification is AI P III.

Class I: Variation I:a. Posterior missing, Anterior all teeth

present.b.Posterior missing, some anterior teeth

missing.

Variation IIa. Anterior missing, All posteriors present.b.Anterior missing, some posteriors

missing.

Class II: Division I has variation 1 and 2. Division II has variation 1 and 2 This classification is tooth tissue

bearing. Class III is edentulous state.

A- Anterior space. B- Bound posterior space. C-Cantilever situation or a posterior free

end saddle.

Class I: Mucosa borne. Class II: Tooth borne Class III: Combination of mucosa borne

and tissue borne.

RULE 1: classification should follow rather than precede any extractions of teeth hat might alter the original classification.

RULE 2: If a third molar is missing and not to be replaced it is not considered in the classification

RULE 3: If a third molar is present and is to be used as an abutment, it is considered in the classification

RULE 4:If a second molar is missing and is not to be replaced, it is not considered in the classification

RULE 5: The classification is always determined by the most posteriorly edentulous area or areas

RULE 6: Edentulous areas other than those determining the classification are referred to as modifications and are designated by their number.

RULE 7:The extent of modification is not considered, only the number of additional edentulous areas.

RULE 8: There can be no modification areas in class IV arches (another edentulous area lying posterior to the “single bilateral area crossing the midline” would determine the classification.)

Applegate added two more classes to Kennedys existing classification

Class V: This is an edentulous area bounded anteriorly and posteriorly by natural teeth, in which the anterior abutment is not suitable for support.

Class VI: This is an edentulous situation in which the abutment tooth is capable of total support.(As in young patients)