Effect of number of implants, distal implant inclination, and angled abutment on stresses in fixed complete dentures: a nonlinear finite element analysis

Objectives: This nonlinear three-dimensional finite element analysis (FEA) study evaluated the effect of number implants, distal implant inclination, and use angled abutments on stress magnitude distribution in cortical bone (CB), abutment screw (AS), prosthetic (PS) implant-supported fixed complete dentures. Methods: Nonlinear 3D FEA models mandibular dentures were created with five, four, or three parallel straight implants (5S, 4S, 3S) tilted (5T, 4T, 3T). In addition, 5T model was tested using over to re-align inclination. A 100-N axial load applied first molar region (cantilever) analyze von Mises stresses selected points (CB, AS, PS). Results: The adjacent showed highest CB, PS. higher than ones four five implants. Peak AS increased 40% from 100% Tilting CB. PS 150% 5S 4S 4T models. Angled generated lower CB but Conclusions: results suggest that bone, screw, increase when tilting posterior reducing decreased at bone-implant interface screws screws.