PHOTOS OF THE COMMON MAJOR CONNECTORS DESIGNS OF REMOVABLE PARTIAL Kennedy class one Kennedy 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 1 st method 2 nd 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 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 representi ng the fulcrum line and perpendicu lar lines representi ng potential positions of indirect retention needed. Physical retention — latticewor k — drawn on the preliminar y cast. minimum of 8 mm below the free gingival margin is required in order to use a lingual bar.here,t here is not enough available space to meet this requiremen t 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.