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Stress distribution of four implant supported overdentures with tilted standard-sized implants and mini implants

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TURP I.
TURP V.
Tuncel İ.
Üşümez A.

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Abstract

Purpose The goal of the current study is to evaluate the stress distribution when tilted implants and mini-implants are used to support a mandibular overdenture. Materials and Methods Three-dimensional (3D) finite element models of mandibular overdentures were established using four, axial, standard-sized implants (SA model), four standard-sized implants with the mesial ones axial and the distal ones tilted (ST model) and four mini-implants (MA model) with Locator attachments. On each model, a 100 N load was applied to the overdenture in four different directions; bilateral vertical, unilateral vertical and oblique load on the posterior region, and a vertical load on the incisors. The stresses distributed at the peri-implant bone, implants, the prosthetic components, and the overdentures were evaluated. Results Non-axial posterior loading caused higher stress values in the implant and the prosthetic component than axial posterior loading. Lower stress values of the implant and the prosthetic component were observed in the ST model than SA model. The stress distribution in the overdenture at posterior loads were mostly observed around the implants. Conclusion Less prosthetic complications may be expected when the treatment option in the ST model is used. Fatigue fractures may occur around the implants in the overdentures, precautions are advised.

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TURP I., TURP V., Tuncel İ., Üşümez A., "Stress distribution of four implant supported overdentures with tilted standard-sized implants and mini implants", European Oral Research, cilt.58, sa.2, ss.95-101, 2024

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