Kennedy's Classification_ Applegate's Rules || Prosthodontics RPD || important RPD Terminologies

RPD’s Removable Partial Denture

These are the prosthodontics that are used to replace the missing teeth & supporting structures/tissues with a special designed prosthesis. This prosthesis is removable by the wearer/patient.

Applegate's Rules & Kennedy's Classes

Some common terminologies used for FPDS

What is an Appliance?

This device is worn by a patient during treatment course. Such as

• Orthodontic Appliances
• Surgical Splints
• Space maintainers

What is an abutment?

This is a part of teeth, implant or structure on which our prosthesis  is placed and it provide support to it.

What is Retainer?

Are also called Clasps. These are the fixation devices that are applied directly to an abutment tooth and is used for the prosthesis fixation.

What is interim Denture?

Interim is a temporary denture used for the short period of time to fulfill the aesthetics, mastication until a definite form of treatment can be rendered.

 What is Transitional Denture?

This type of the denture may be used when loss of additional teeth is inevitable but immediate extraction is not advisable. Artificial teeth may be added to this type of denture.

Lets we discuss about the kennedy’s classification:

Background:

in 1923 Dr. Edward kennedy ( New York) proposed this classification. This is the most popular classification among all classes. Unlike CUMMER, Kennedy classified the partially edentulous arches & not denture.

There are 6 classes in Kennedy’s Classification system;

Class 1

Bilateral edentulous area presents at the posterior of the remaining natural teeth. 

kennedy's class 1

Class 2

Unilateral edentulous areas located at the posterior to the remaining natural teeth. There is a single edentulous space.

Kennedy's class2

Class 3

Unilateral edentulous areas that are located anterior and posterior to it. It does not cross the midline like class IV.

Kennedy's class 3

Class 4

Single, bilateral edentulous areas that are located anterior to remaining natural teeth. This class crosses the midline.

Kennedy's class 4

Class 5

In this class edentulous areas are bounded anterior and posterior by natural remaining teeth. In this type anterior abutment is not suitable for support.

class v kennedys

Class 6

In this class edentulous areas are bounded anterior and posterior by natural remaining teeth. In this type anterior abutment is suitable for support.

 

class 6

Note: 

•           Class 3 has short and long Span.
•             Class 5 and 6 are the modified forms of Applegates Rules.

Now we are discuss about the APPLEGATE’S Rules:

There are eight ( 8 ) Rules.

Rule# 01

Classification should follow the extraction.

Rule# 02

If third 3^rd molar is miss and patient don’t want to replace it, it will not be considered in the classification.

Rule# 03

If third 3^rd molar is miss and acts as an abutment it will be considered in the classification.

Rule# 04

If 2^nd Molar is miss and it is not to be replaced then it is not considered in the classification.

Rule# 05

Posterior edentulous areas always determine the classification/class. Means like if we have anterior and posterior edentulous space then our Posterior space or areas always determine our classification ( Kennedys classification), and remaining space determine the modification.

Rule# 06

Edentulous areas other than those which determines the class are referred to  as modification designed by their number.

Rule# 07

The extent of modification is not considered, only the number of edentulous areas are considered. Means if we have two edentulous spaces most posterior will determine our class and remaining will determine our modification. This modification is written in numbers. i.e. Class2-mod1

Rule# 08

There is no any modification in the class IV.