PHOTOS OF THE COMMON MAJOR CONNECTORSDESIGNS OF REMOVABLE PARTIAL DENTURE

Kennedy class oneKennedy class two

Kennedy class three

Kennedy class four

Prepared by Marwa Merheb & Bilal Taouk

Middle palatal bar Antero-posterior palatal strap

Antero-posterior palatal bar u-shape

Palatal strap Complete palate

Lingual bar Lingual plate

1st method 2nd method

Rest seats adjacent to the edentulous area

Or,the rest is positioned on the mesial of the most distal tooth adjacent to an unbound edentulous space, and adjacent to the edentulous space on the tooth - bound edentulous spaces.

Proximal view of 47; red hash marks represent position on the proximal surface that will be modified to create guide planes.

Line drawn between the two distalmost rest seats representing fulcrum line and perpendicular lines representing potential positions of indirect retention needed.

Black line drawn between the two distalmost rest seats representing the fulcrum line and the perpendicular blue line representing potential position of indirect retention needed

Design drawing with additional

indirect rest seats drawn on the mesioocclusal of tooth 34.

The indirect rest seat already is present.

Since latticework is considered the physical retention of choice for replacement of multiple teeth, the determination is made based on the inability to use this type of physical retention.If the lack of vertical space is not a limiting factor, then latticework should be selected.

The same view

Occlusal view of mandibular cast

The rest seats are drawn on the teeth adjacent

to the edentulous areas

Proximal view on 35.

red hash marks represent surface that will be modifi ed to create

guide planes.

indirect rest seat

Line drawn between the two distal most rest seats representing the fulcrum

line and perpendicular lines representing potential positions of indirect retention needed.

Physical retention — latticework — drawn on

the preliminary cast.

minimum of 8 mm below the free gingival margin is required in order to use a lingual bar.here,there is not enough

available space to meet this requirement

Therefore, a lingual

plate is selected.

Photo of the proposed RPD design

Unlike a Kennedy Class I or II removable partial denture support, which is both tooth and soft – tissue supported, Kennedy Class III removable partial dentures are tooth supported. As a result their biomechanics are similar to a fixed partial denture in that they depend on a healthy periodontium for their entire support. Assuming for this patient that his or her periodontal status is healthy.

In Kennedy Class

III situations, anteroposterior palatal straps

and palatal straps are commonly used.