Photoelastic Stress Analysis for Mandibular Implant Supported Overdenture with Two Types of Denture Base Materials: A Comparative in vitro Study

Document Type : Original Article

Authors

1 Removable prosthodontics department,faculty of dentistry, suez canal university, ismaillia, egypt

2 Professor of Prosthodontics Faculty of Dentistry, Suez Canal University.

3 Assistant Professor of Prosthodontics Faculty of Dentistry, Suez Canal University.

Abstract

Introduction: Different denture base material properties affect stress distribution
in different ways around Prosthetic abutments and surrounding bone, as well as extent
of bone remodeling. Aim: The purpose of this in vitro study is to investigate the distribution
of stresses around a four telescopic dental implants supporting structure induced
by two types of mandibular implant supported over denture base materials (acrylic
resin and karadent dentures) using photoelastic analysis. Materials and methods: Ten
telescopic mandibular implant overdentures had been constructed on an epoxy educational
resin cast and according to the used denture base material were divided into two
groups. For the first group: Five telescopic mandibular implant overdentures of Semirigid
microcrystalline polymer denture base material (karadent). For the second group:
The same but with conventional heat cured denture base material. For both groups
models successive loads (20,40,60,80,100 newton) were applied using photo elastic
stress analysis machine by using metal plate fixed at the lower first molar region bilaterally
then stresses were recorded and analyzed. Results: the acrylic resin mandibular
overdenture denture base material showing an increasing the mean stress value around
implant supporting structure than the karadent one. Conclusion: The use of semi-rigid
microcrystalline polymer dentures demonstrates favorable stress distribution more than
the conventional heat cured dentures.

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