Probing combinational influence of design variables on bone biomechanical response around dental implant‐supported fixed prosthesis

Abstract

This study aimed to understand the effect of physiological and dental implant-related parameter variations on the osseointegration for an implant-supported fixed prosthesis. Eight design factors were considered (implant shape, diameter, and length; thread pitch, depth, and profile; cantilever [CL] length and implant-loading protocol). Total 36 implantation scenarios were simulated using finite element method based on Taguchi L 36 orthogonal array. Three patient-specific bone conditions were also simulated by scaling the density and Young's modulus of a mandible sample to mimic weak, normal, and strong bones. Taguchi method was employed to determine the significance of each design factor in controlling the peri-implant cortical bone microstrain. For normal bone condition, CL length had the maximum contribution (28%) followed by implant diameter (18%), thread pitch (14%), implant length (8%), and thread profile (5%). For strong bone condition, CL and implant diameter had equal contribution (32%) followed by thread pitch (7%) and implant length (5%). For weak bone condition, implant diameter had the highest contribution (31%) followed by CL length (30%), thread pitch (11%) and implant length (8%). The presence of distal CL in dental framework was found to be the most influential design factor, which can cause high strain in the cervical cortical bone. It was seen that implant diameter had more effect compared to implant length toward peri-implant bone biomechanical response. Implant-loading time had no significant effect towards peri-implant bone biomechanical response, signifying immediate loading is possible with sufficient mechanical retention.

Influence of Implant Number on Peri-Implant and Posterior Edentulous Area Strains in Mandibular Overdentures Retained by the New Ti–Zr (Roxolid®) Mini-Implants as Single-Units: In Vitro Study

“…New materials, new techniques and dental implant modifications, as well as many other factors related to implant prosthodontic treatment innovations, need thorough in vitro investigation before their safe clinical utilization [27][28][29]. Due to a lack of studies on interface stress from implants on bone, which determines the strain level within the loaded bone, in vitro studies to predict clinical outcomes and marginal bone loss from peri-implant bones are crucial.…”

“…Due to the very good mechanical properties of the new Ti-Zr mini-implant system and the excellent osseointegration of the alloy, it would be interesting to find out whether less than the recommended four Ti-Zr mini-implants inserted in the mandible as single-units can successfully support a mandibular OD. In vitro studies are required before the safe clinical utilization of any new material, clinical technique or modification of any procedures [27][28][29]. Due to the difference in the stiffness of the implant material and the bone, the highest stress is distributed at the implant-bone interface.…”

Three-dimensional finite element analysis of the biomechanical behaviour of different dental implants under immediate loading during three masticatory cycles

“…Nevertheless, immediate loading maintains its viability and efficacy when dental implants possess sufficient mechanical retention [ 13 ]. An ideal scope of initial implant micromotion during immediate loading can be established to achieve the desired long-term functional characteristics [ 14 ].…”