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.