الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 104 |  |  |
| | | from | 104 | | |
Abstract
A prosthetic approach for minimizing the occlusal load transmitted to the supporting tissue for distal extension ridge are the use of silicone material that introduced between the artificial teeth and the denture base (occlusal reactive) and the use of flexible base. Aim of work: The aim of the work was to study in vitro, the effect of different resilient material design concepts used in distal extension RPD on stress transmitted to the abutment teeth. The design concept include: (1) occlusal reactive, (2) flexible base. Materials and methods: This study was carried out on (10) identical Partially edentulous mandibular resin model of bilateral distal extension ridge. Polyvinyl siloxane impression material was placed to simulate mucosa covering the ridge. After RPD framework was constructed. The models was classified into two equal groups according to the processing of denture base. These includes: - Group (I) occlusal reactive mandibular distal extension RPD. Group (II) flexible base mandibular distal extension RPD .On the model and after the strain gauges were luted to root surface of abutment teeth, unilateral load of 60N was applied on central fossa of 1st molar tooth. The strain subjected to root surface of abutments was recorded by Lloyed testing machine. Result: 1) Abutment distal surface of loaded and unloaded side subjected to high amount of strain for occlusal reactive distal extension removable partial denture. 2) The lingual surface of abutment teeth subjected to high amount of strain followed the distal surface for resilient denture RPD in both loaded & unloaded side. 3) Abutment root surface of loaded side for both occlusal reactive & flexible base RPD subjected to more strain compared to unloaded side. 4) Occlusal reactive RPD exhibit less strain subjected to abutment surface of load side compared to flexible base one. Conclusion: 1) Occlusal reactive distal extension RPD is superior to flexible base in regard to stress transmitted to abutment teeth. 2) from tissue preservation point of view, occlusal reactive distal extension removable partial denture is a prosthetic approach to minimize stress applied to the abutment teeth.