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 unilateraledentulous space havingnatural 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 1 If two additional edentulous areas are present it could be designate as Class I modification 2 A unilateral saddle with one additional edentulous area is Class II modification 1
A unilateral bounded edentulous area with threeadditional edentulous areas is class III modification3
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 classificationClass 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)