The effect of implant neck microthread design on stress distribution of peri-implant bone with different level: A finite element analysis

Abstract

Background/purpose Significant research has proposed that the implant with microthread in the neck can significantly reduce marginal bone loss, but whether it is consistent in the condition of marginal bone loss is still unknown. The objective of this study is to investigate the effect of microthread on stress distribution in peri-implant bone with different bone level using finite element analysis. Materials and methods A series of computational models of mandible segments with different bone resorption and implant models with or without microthread in the neck was installed by computer-aided design software. The simulated occlusal force of 150N was applied buccolingually on the top center point of implant. The FEA was performed, and the von Mises stress, principal stress and shear stress in peri-implant bone were recorded and analyzed. Results In all models, the T-neck group exhibits higher von Mises stress and principal stress, as well as lower shear stress than S-neck group. Three types of stresses increase with the depth of bone resorption developed, but the differences of shear stress between two groups of implants were gradually decreased. Conclusion The micro-thread design in implant neck can reduce marginal bone loss by decreasing shear stress in peri-implant bone, but this effect is gradually weakened with the decline of the marginal bone level.

Effect of microthread design on the preservation of marginal bone around immediately placed implants: a 5-years prospective cohort study

“…It has been suggested by finite element analysis (FEA), that the microthreaded design could lead to more compressive and less shear stress under off-axis loading and is less likely to pose a risk of MBL triggered by overloading [ 20 ]. However, the authors decided not to refer to such results for two reasons.…”

“…One of these modifications is addition of microthreads in the coronal part of implants [ 8 , 11 – 16 ]. As shown in finite element analysis studies, the microthraed design allows a better distribution of stress to the surrounding bone and may minimize the marginal bone loss (MBL) [ 17 – 20 ]. Several clinical studies have also demonstrated that rough surfaced implants with microthreads at the neck can better resist axial loads and preserve the marginal bone level during the healing period; therefore, resulting in less MBL under functional loading [ 6 , 7 , 11 , 21 – 23 ] But microthreads designed on implant neck surfaces have been reported to provide controversial clinical outcomes [ 12 , 24 ].…”

Simulation Analyses Related to Human Bone Scaffold: Utilisation of Solidworks® Software in 3D Modelling and Mechanical Simulation Analyses

“…In the area of implant reconstruction, there are researchers who investigated the effects of micro thread on stress distribution during bone pre-implantation using FEA. Different types of bones were constructed using several computational models of the human mandible with the simulation of bone resorption [15]. A healthy male mandibular bone was scanned using a cone-beam computed tomography where the acquired images were imported to Materialise-Mimics v17 software for further image processing and modelling.…”

Numerical analysis of WaveOne Gold and 2Shape endodontic files during root canal treatment

“…In this approach, model data was acquired by non-contact laser systems, and it was implemented for dental and biomechanical applications. Jin et al 11 investigated the influence of micro-thread in peri-implant bone with a distinct level of bone using the numerical model. Moreover, they investigated the effect the micro-thread in peri-implant bone on stress distribution.…”