Evaluation Of Removable Acrylic Dentures Bases Resistance To Breakage After Repairing Using Different Materials And Multiple Surface Designs Of The Fracture Line Region (An Vitro Study)

Abstract

Introduction: Repairing and strengthening removable denture bases is a useful solution for improving the resistance of removable prostheses to fracture forces caused by repeated use and accidental trauma. The widespread use of polymethyl methacrylate (PMMA) and its disadvantages related to mechanical properties, strengthening and repairing it using various methods has become an urgent necessity.

Objective: This in vitro study aims to compare the flexural resistance of removable denture bases before and after repair using different repair methods.

Materials and Methods: The study sample included 120 acrylic specimens in the shape of a rectangular parallelepiped and measuring 3*10*60. The sample was divided into 12 groups according to the repair material, fracture shape, and modifications made to the fracture line surface. These groups were tested with a flexural resistance test.

Results: The results of the statistical analysis showed that there were statistical differences in the results of the flexural resistance of the samples before and after repair using different methods.

Conclusions: Within the limits of this study, we conclude that the repair techniques improved the flexural resistance of the repaired specimens. Repairing the non-combustible fracture specimens with heat cured acrylic with a 45° chamfer gave the highest values of flexural resistance.