A Three Dimensional Finite Element Analysis of Reaction Force, Maximum Principal Stress and Stress Distribution of Three Removable Partial Denture Clasp Materials
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Abstract
Background: Acetal resin and polyetheretherketone (PEEK) became candidate for removable partial denture clasps. The clasps were subjected to daily movement during insertion and removal of the prostheses by the patient. Therefore, it was necessary to consider their reaction force, maximum principal stress and stress distribution prior material selection.
Objective: To analyze reaction force, maximum principal stress and stress distributions Cobalt-Chromium alloy (Co-Cr), acetal resin and PEEK clasps with different taper ratios and displacements using 3-D FEA.
Methods: Three taper ratio (0.6, 0.8 and 1.0) 3D clasp models were created. These models were loaded. The loading point was set at 3 mm from the tip with three displacements (0.5, 1.0 and 2.0 mm.). All models were analyzed using finite element analysis to determine reaction forces and maximum principal stress and stress distribution.
Results: The positive correlations were found between reaction force and taper ratio, and between reaction force and displacement for all models. The reaction force was maximum in Co-Cr, followed by PEEK and then acetal resin. Moreover, the positive correlations were found between maximum principal stress and taper ratio, and between maximum principal stress and displacement for all models. The maximum principal stress was maximum in Co-Cr, followed by PEEK and then acetal resin. The maximum principal stress of all Co-Cr models exceeded its yield stress.
Conclusions: PEEK and acetal resin can be materials of choice for RPD clasps. To achieve a sufficient retentive force for clinical use, they should be increased in dimension and require more undercut on the abutment tooth.
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