Finite Element Analysis of Bone Stress for Miniscrew Implant Proximal to Root Under Occlusal Force and Implant Loading

Abstract

Because of the narrow interradicular spaces and varying oral anatomies of individual patients, there is a very high risk of root proximity during the mini implants inserting. The authors hypothesized that normal occlusal loading and implant loading affected the stability of miniscrew implants placed in proximity or contact with the adjacent root. The authors implemented finite element analysis (FEA) to examine the effectiveness of root proximity and root contact. Stress distribution in the bone was assessed at different degrees of root proximity by generating 4 finite element models: the implant touches the root surface, the implant was embedded in the periodontal membrane, the implant touches the periodontal surface, and the implant touches nothing. Finite element analysis was then carried out with simulations of 2 loading conditions for each model: condition A, involving only tooth loading and condition B, involving both tooth and implant loading. Under loading condition A, the maximum stress on the bone for the implant touching the root was the distinctly higher than that for the other models. For loading condition B, peak stress areas for the implant touching the root were the area around the neck of the mini implant and the point of the mini implant touches the root. The results of this study suggest that normal occlusal loading and implant loading contribute to the instability of the mini implant when the mini implant touches the root.

Three-dimensional finite element analysis of the stability of mini-implants close to the roots of adjacent teeth upon application of bite force

“…The peak values of stress and displacement within the bone around the implant neck and the surrounding bone close to the tooth root increase significantly as the distance between the implant and the root decreases. However, when a load is applied to the implant separately, the relationship between implant stability with the proximity of the mini-implant to the adjacent root is unclear 18) . To date, no studies have evaluated the effects of different loading conditions on the clinical stability of mini-implants close to tooth root.…”

The effects of cortical bone thickness and miniscrew implant root proximity on the success rate of miniscrew implant: A retrospective study

“…When it comes to MRP, Shan et al 19 suggested that normal occlusal loading might bring some micromotion to MSI and influence its stability, and the distance between the MSI and the adjacent root was recommended to be at least 1 mm. Some previous clinical studies concluded that inadequate space between MSI and root was considered as one of the major risk factors for MSI failure 1,20,21 .…”

New Dental Implant with 3D Shock Absorbers and Tooth-Like Mobility—Prototype Development, Finite Element Analysis (FEA), and Mechanical Testing

“…A high number of studies present the use of FEA in oral implantology. They evaluate biomechanical aspects [59,60,61,62,63] but also tissue-related issues [64,65,66,67,68]. Such tests might provide only partially relevant information since the accurate definition of tissue parameters is impossible.…”