What is the Kennedy Class I classification?
This was developed by Dr Edward Kennedy in the 1920s. The classification is ranked based on the most commonly found partially dentate situations. Kennedy Class I describes a patient who has BILATERAL free-end saddles, i.e. they have edentulous posterior areas bilaterally.
What is the Kennedy classification of Saddle?
Kennedy Classification Summary 1 Class I – posterior, bilateral free-end saddles 2 Class II – posterior, unilateral free-end saddle 3 Class III – posterior, unilateral bounded saddle 4 Class IV – anterior bounded saddle 5 Class I, II and III can have modifications.
What is an example of a Kennedy Class I case?
Examples: This is a Kennedy Class I Mod II case as along with having bilateral free-end saddles, there are two further edentulous areas that need replacing. This is a Class III Mod I as there is a unilateral bounded saddle with one further edentulous area.
What is Kennedy classification of edentulism?
Classification of edentulism (condition of having missing teeth) has been created by Dr. Edward Kennedy and it is known as the Kennedy classification. It is easy to remember, simple and practical.
Why do we use Kennedy classification?
Kennedy's method of classifying the Edentulous arch is one of the simplest and most used classification systems because of the ease at which it can be discussed with others as it brings immediate visualization of the partially edentulous arch.
What determines the basic classification of edentulous arches?
The most posterior edentulous space determines the class of the arch for Classes I through IV. The length of the edentulous space, i.e. the number of missing teeth or the number of prosthetic teeth to be used on the denture, is not considered in the classification.
What is Ante's law?
Ante's law states that “the total periodontal membrane area of the abutment teeth must equal or exceed that of the teeth to be replaced.”1 For more than 80 years, this law has been taught in standard textbooks of prosthodontics as an important condition influencing FDP design.
What is RPI system?
RPI is a modified I-bar retainer system. Krol devised it in 1973. All the components of the I-bar assembly were modified significantly to fulfill Krol's design. Principle of Krol's design was – “Stress control with minimal tooth & gingival coverage”.
How is the denture base area classified?
Denture base resins are extensively used in dentistry for a variety of purposes. These materials can be classified as chemical, heat, light, and microwave polymerization materials depending upon the factor which starts the polymerization reaction.
What are the types of RPD?
The two common types of removable partial dentures are cast metal partial dentures and acrylic flippers.
What is Christensen phenomenon?
[C. Christensen, Danish dentist and educator] A gap occurring in the natural dentition or between the opposing posterior flat occlusal rims when the mandible is protruded (posterior open bite). It can lead to instability in full dentures unless compensating curves are incorporated into the dentures.
What is FPD in dentistry?
The fixed partial denture (FPD) is a dental restoration used to replace missing teeth and that is permanently attached to adjacent teeth or dental implants.
What happens if you violate biologic width?
Biologic width violation can lead to bleeding or recession of the gingival tissue; chronic inflammation of the gingival tissue, especially immediately around the restoration; the formation of pockets between the gums and teeth; and loss of alveolar bone.
What is RPA and RPI?
The RPA clasp was developed to deal with the problems encountered with the use of the RPI clasp. The initials signify rest, proximal plate, and Akers clasp arm. The mesial rest and proximal plate are designed identically to those of the RPI clasp. The difference is in the retentive arm.
Why is RPI system used?
RPI System Used to prevent distal movement/tipping of abutment tooth to a free end saddle. Allows the free saddle to rotate slightly without damaging the soft tissues or abutment tooth.
When is RPI system used?
The RPI system (rest, plate, I-bar clasp) should be used on premolar abutment teeth for mandibular distal extension saddles if the tooth and buccal sulcus anatomy is favourable.
Kennedy Class I
Kennedy Class I describes a patient who has BILATERAL free-end saddles, i.e. they have edentulous posterior areas bilaterally. This is the most common classification. There are no further posterior teeth to the edentulous area. A free-end saddle is where the saddle is not resting on teeth on both sides (i.e. is lacking an abutment tooth).
Kennedy Class II
This describes a patient who has a UNILATERAL free-end saddle, i.e. they have a one-sided, posterior edentulous area. They have no further teeth behind the edentulous area. As the image below shows, it is like a Class I but just covering one side of the arch.
Kennedy Class III
This describes a patient who has a UNILATERAL BOUNDED POSTERIOR saddle. This means that the edentulous area has teeth located both anteriorly and posteriorly to it, as shown in the image below. As they do not possess free-end saddles, they tend to be far more secure cases when being worn.
Kennedy Class IV
This describes a patient with a SINGLE, ANTERIOR BOUNDED saddle. This is the rarest of the classifications.
Modifications
This refers to multiple edentulous areas present in a case. Modifications can only apply to Kennedy Classes I, II and III. This is because a Kennedy Class IV case with modifications would fall in to one of the other classifications, as these take priorities. Examples:
What is a Kennedy Class III?
Kennedy Class III: A unilateral edentulous space with natural teeth remaining both anterior and posterior to it. In a Kennedy Class III scenario, the edentulous area is on one side, but have teeth anterior and posterior to the edentulous space. The partial denture is designed as follows:
What is the edentulous space in a Kennedy class II?
In a Kennedy Class II scenario, the edentulous space is similar to class I but present only on one side of the arch. The partial denture is designed as follows:
What is the first class of edentulous area?
An edentulous area should be classified as Kennedy Class I first, before moving on to classify as Kennedy Class II. An edentulous area should be classified as Kennedy Class II first, before moving on to classify as Kennedy Class III.
What is the classification of an edentulous area?
An edentulous area should be classified as Kennedy Class III first, before moving on to classify as Kennedy Class IV. Rule 6: Edentulous areas other than those that determine the classification are referred to as modifications and are designated by their number.
What is Kennedy's class?
There are two more Classes added to Kennedy’s classification which are –. Class V: An edentulous area bound by teeth anteriorly and posteriorly, but where the anterior tooth is not suitable to be used as an abutment. Class VI: An edentulous situation where the bounded teeth are capable of total support of the prosthesis.
How many rules does the Kennedy method have?
The Kennedy classification would be difficult to apply to every situation without certain rules for application. Applegate has provided the following eight rules governing the application of the Kennedy method.
What is class III in dentistry?
CLASS III: A unilateral edentulous area with natural teeth remaining both anterior and posterior to it. CLASS IV : A single, but bilateral (crossing the midline), edentulous area located anterior to the remaining natural teeth. Kennedy’s method of classifying the Edentulous arch is one of the simplest and most used classification systems because ...
What is the classification of a missing third molar?
RULE 3: If a third molar is present and is to be used as an abutment, it is considered in the classification.
Which method of classification is the simplest and most used?
Kennedy’s method of classifying the Edentulous arch is one of the simplest and most used classification systems because of the ease at which it can be discussed with others as it brings immediate visualization of the partially edentulous arch. This gives the dentist to visualize the treatment plan in advance about the design of the partial denture.
Is a Class II partial denture a Class I or II?
In case of Class II partial denture it imparts design elements from Class I and Class III classification, hence it is classified between Class I and II.
What is a RPD?
Tooth supported RPD A partial denture that receives support from the natural teeth at each end of the edentulous space or spaces. Tooth tissue supported RPD The denture base that extends anteriorly/ posteriorly and is supported by teeth at one end and tissue on the other end – distal extension partial dentures. 8.
What is the definition of RPD?
2. DEFINITION- PROSTHODONTICS Defined as the “branch of dentistry pertaining to the restoration and maintainence of oral function, comfort, appearance and health of the patient by restoration of natural teeth or the replacement of missing teeth and contiguous oral ...
