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A Finite Element Approach for Locating the Center of Resistance of Maxillary Teeth
Published on: April 8, 2020
Shield design of maxillary central incisors in the socket shield technique: A finite element method study
Qianqian Zuo1, Haidong Teng2, Desmond Y R Chong3
1Graduate student, Department of Biomedical Engineering, School of Architecture and Environment, Sichuan University, Chengdu, PR China; and Graduate student, Sichuan University Yibin Park, Yibin, PR China.
Statement Of Problem:
The preservation of the shield is a key characteristic of the socket shield technique (SST). However, the biomechanical effects of different shield designs remain unclear.
Purpose:
The purpose of this finite element method study was to evaluate the effects of parametric shield designs for maxillary central incisors on the biomechanical environment of the implant region, providing a biomechanical perspective for optimizing shield design.
Material And Methods:
A 3-dimensional model of the complete maxilla was reconstructed, and the left maxillary central incisor with various shield design configurations was selected for the SST. Variations shield apical dimensions (100%, 80%, and 60%), coronal dimensions (100%, 80%, and 60%), and lengths (2/3, 1/2, and 1/3 of the root length) were created to assess the biomechanical effects of shield shape on the implant region. Additional models with varying shield thicknesses (1 mm, 1.5 mm, and 2 mm) and jump gaps (1 mm, ±20% and ±40%) were developed to evaluate their impact on the biomechanics of the SST. Time-dependent loading was applied, and the biomechanical behaviors of the shield, periodontal ligament (PDL), implant components, and surrounding bones were analyzed. Statistical analysis was performed using the general linear model univariate procedure.
Results:
The displacement of the shield and PDL was positively correlated with the apical-coronal dimensions. A shield length of 1/2 the root length was recommended. Thicker shields reduced stress on the shield. In contrast with decreasing the jump gap, increasing the jump gap resulted in a considerable reduction in peak stress along the edge of the shield (P<.05). Both shield thickness and jump gap significantly affected bone stress and strain (P<.01).
Conclusions:
Reducing the coronal dimension is more advantageous. A 1/2 root-length shield balanced stress and practicality. A wider jump gap and thicker shield were beneficial for reducing shield stress and promoting bone tissue health.
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