Kennedy’s classification of Edentulous arch & Applegates rules

Dr. Edward Kennedy proposed this classification of Edentulous spaces in 1923. It is the most widely used classification of Edentulous arches. The classification is useful for the treatment of partially Edentulous arches.

Kennedy classification

Kennedy classification of Partially Edentulous arches (1923)

Kennedy had classified the Edentulous spaces in 4 classes but later on two more classes were added as Applegate’s modification. Let’s learn about all of them.

 

Kennedy's classification of rpd

Class I – Bilateral Edentulous areas located posterior to the remaining natural teeth. i.e. Two Edentelous spaces are seen located in posterior region with no teeth posterior to it.

Class II – Unilateral Edentulous area located posterior to the remaining natural teeth. i.e. There is only one Edentulous space located in posterior region with no teeth posterior to it.

Class III – Unilateral Edentulous area with natural teeth both anterior and posterior to it. i.e. It has edentulous space surrounded by natural teeth on both sides which do not cross the midline.

Class IV – Single bilateral edentulous area located anterior to the remaining natural teeth. This is a single edentulous space crossing the midline of the arch with natural teeth posterior to it on both sides.

Applegate’s modifications (1960)

Class V – Kennedy Class III but in which the anterior abutment (Lateral incisor) is not suitable for support.

Class VI – Kennedy Class III in which the anterior abutment is suitable for support. This class hardly requires any tissue support while all other RPD (Removable partial denture) require tissue support. thus, it differs from the Kennedy Class III classification and seen as separate class.

Applegate’s rules

These rules are considered for the determining the Kennedy’s classification. It holds equal importance to that of Kennedy’s classification.

Rule 1 – Classification should follow rather than precede extractions that might alter the original classification.

Rule 2 – If the third molar is missing and not to be replaced,it is not considered in the classification.

Rule 3 – If the third molar is present and is to be used as an abutment, it is considered in the classification.

Rule 4 – If the second molar is missing and is not to be replaced, it is not considered in the classification.

Rule 5 – The most posterior edentulous area or areas always determine the classification.

Rule 6 – Edentulous areas other than those, which determine the classification, are referred to as modification spaces and are designated by their number.

Rule 7 – The extent of the modification is not considered, only the number of additional edentulous areas, i.e. the number of teeth missing in the modification spaces is not considered only the number of additional
edentulous spaces are considered.

Rule 8 – There can be no modification areas in class IV. Because any additional edentulous space will definitely be posterior to it and will determine the classification.

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