Effect of microthread design of dental implants on stress and strain patterns: a three-dimensional finite element analysis

Abstract

The aim of this study was to use finite element analysis (FEA) to assess the influence of microthread design at the implant neck on stress distribution in the surrounding bone. A commercially available implant with 3.5 mm diameter and 10.5 mm length was selected and used as a model. For the purpose of designing the microthread implant model, microthreads were added to the implant neck in a computerized model. A force measuring 100 N was then applied to the entire surface of the abutment in the vertical direction. The results showed that in both models, stress was mainly concentrated at the cortical bone adjacent to the neck of the implant. Maximum stress values in the cortical bone surrounding the implant surface periphery were 12 and 6.25 MPa for the microthread and conventional models, respectively. In this study, we conclude that adding a microthread design at the implant neck decreased stress values in the adjacent bone.

The outcome of oral implants placed in bone with limited bucco‐oral dimensions: a 3‐year follow‐up study

“…These micro‐threads and the combination of the roughened surface in the marginal part of the implant might be of importance for the maintenance of the marginal bone level (Amid et al. , Lee et al. , Ozkir & Terzioglu , Rocci et al.…”

Effects of occlusal forces on the peri‐implant‐bone interface stability

“…Different methods have been introduced to control and reduce the stresses around the implant body. Examples of this are changes to the implant neck, design changes to the implant thread configurations, and implant surface modifications …”

“…The second mechanism is the capability of the microthreads to withstand and transform axial and off‐axial loads, which leads to more compressive stresses and less shear stresses . Apparently a dental implant with a microthreaded neck that receives an axial load of 100 N can reduce the maximum stress values transferred to the cortical area by up to 6.25 MPa compared with a conventional implant without microthreads, which presented maximum stress values of 12 MPa …”

A randomized controlled clinical trial to assess crestal bone remodeling of four different implant designs

“…However, no implant-abutment interface seems to fully prevent bacterial penetration, 17 which makes the clinical relevance of this enhanced bacterial seal questionable. 26,27 These could confirm that the presence of microthreads on the implant neck decreased stress values in the adjacent bone. In an in vitro study, 21 load transfer characteristics of a full-arch restoration supported by four implants with external and internal implant-abutment connections were compared.…”

“…In multiple in vitro studies, stress distribution on the surrounding crestal bone was measured using a finite element analysis around implants with and without microthreads. 26,27 These could confirm that the presence of microthreads on the implant neck decreased stress values in the adjacent bone. Multiple clinical studies described a difference in crestal bone loss between microthreaded and non-microthreaded implants.…”