ASSESSMENT OF STRESS DISTRIBUTION AROUND IMPLANT WITH DIFFERENT INCLINATION IN IMPLANT RETAINED MANDIBULAR OVER DENTURE USING TWO DIFFERENT STUDS ATTACHMENT DESIGN (EQUATOR AND LOCATOR); 3D FINITE ELEMENT ANALYSIS

Document Type : Original Article

Authors

1 MSc, Department of oral Implantology, Faculty of Dentistry, Cairo university

2 Professor of Prosthodontics, Faculty of Dentistry, Cairo University

3 Prosthodontic ,Faculty of Dentistry Cairo University Cairo

10.21608/edj.2025.386858.3491

Abstract

Overdenture supported by two intraforaminal implants become the most applicable treatment for completely edentulous mandible

Aim: This study aims to compare the stress distribution pattern between Equators and Locator attachment systems of implant retained overdenture around implant with different inclination in the mandible by computing the distribution of stresses in bone/implant interface in different zone and different direction of force applied using finite element analysis software.

Methods: A three-dimensional finite element analysis model (3D FEA) of an edentulous mandible restored with 2 implant supported overdenture was designed. The attachment systems used was planned to be locator and equator attachments with different angulations between the two implants (0ᵒ, 10ᵒ, 20ᵒ, 30ᵒ). Therefore, 8 models were designed; 4 models for equator and 4 models for locator attachment. Each model was duplicated so that one model is subjected to vertical load (200 N) and its duplicate was subjected to oblique load with angle 45° (200 N) in molar/premolar area.

Results: Equator attachment recorded lesser stresses on the peri-implant bone than locator attachment and, increasing the angle between the two implants in both attachments led to more stresses in peri-implant bone

Conclusion: Cervical part of peri-implant bone is the most affected part whatever the type of the attachment used under vertical or oblique loads. Increasing the angle between the two implants from 0º to 10º, 20 º or 30º lead to increase the stresses received by the per-implant bone especially in the cervical part.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2025
Pages 3151-3166

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