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基于螺纹形状系数评估三种不同微型种植体的稳定性，并通过数值分析不同植入角度的微型种植体周围的应力，与整体内收力相关联。

Evaluation of stability of three different mini-implants, based on thread shape factor and numerical analysis of stress around mini-implants with different insertion angle, with relation to en-masse retraction force.

机构信息

Al-Badar Rural Dental College & Hospital, Department of Orthodontics & Dentofacial Orthopaedics (Gulbarga/KA, India).

出版信息

Dental Press J Orthod. 2020 Nov-Dec;25(6):59-68. doi: 10.1590/2177-6709.25.6.059-068.oar.

DOI:10.1590/2177-6709.25.6.059-068.oar
PMID:33503126
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7869798/
Abstract

OBJECTIVES

Assess the stability of three different mini-implants, based on thread shape factor (TSF), and evaluate stresses at the mini-implant site and surrounding cortical bone on application of retraction force, at two different insertion angles.

METHODS

Mini-implants of three different diameters (M1 - Orthoimplant, 1.8mm), (M2 - Tomas, 1.6mm) and (M3 - Vector TAS, 1.4mm) and length of 8mm were used. Using scanning electronic microscopy, the mean thread depth, pitch and relationship between the two (TSF) were calculated. The mini-implants were loaded into a synthetic bone block and the pull-out strength was tested. One way ANOVA and Tukey post-hoc tests were used to compare the pull-out strength of mini-implants. P values < 0.05 were considered statistically significant. Finite element models (FEM) were constructed with insertion angulation at 90° and 60°, with retraction force of 150 g. The results were analyzed using ANSYS software.

RESULTS

Statistically significant difference was found among all the three mini-implants for thread depth and pitch (< 0.001). Statistically significant higher pull-out force value was seen for Orthoimplant. The stress distribution level in mini-implant and surrounding bone was observed to be smaller for Orthoimplant.

CONCLUSION

Orthoimplant mini-implants have more favorable geometric characteristics among the three types, and less stress with 90°angulation.

摘要

目的

评估三种不同微型种植体的稳定性，基于螺纹形状因子（TSF），并评估在两种不同插入角度下施加回缩力时微型种植体部位和周围皮质骨的应力。

方法

使用三种不同直径的微型种植体（M1-Orthoimplant，1.8mm）、（M2-Tomas，1.6mm）和（M3-Vector TAS，1.4mm）和长度为 8mm 的微型种植体。使用扫描电子显微镜计算平均螺纹深度、螺距和两者之间的关系（TSF）。将微型种植体装入合成骨块中，并测试拔出强度。使用单向方差分析和 Tukey 事后检验比较微型种植体的拔出强度。p 值<0.05 被认为具有统计学意义。以 90°和 60°的插入角度构建有限元模型（FEM），并施加 150g 的回缩力。使用 ANSYS 软件分析结果。

结果

三种微型种植体的螺纹深度和螺距均存在显著差异（<0.001）。Orthoimplant 的拔出力值显著更高。Orthoimplant 的微型种植体和周围骨的应力分布水平较小。

结论

Orthoimplant 微型种植体在三种类型中具有更有利的几何特性，并且在 90°角度下的应力较小。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/6c91990953c8/2176-9451-dpjo-25-06-59-gf7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/546b21384216/2176-9451-dpjo-25-06-59-gf1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/1bee2d026821/2176-9451-dpjo-25-06-59-gf2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/13a9538a4d88/2176-9451-dpjo-25-06-59-gf3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/b298ce5c455f/2176-9451-dpjo-25-06-59-gf4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/6cb76e307d6c/2176-9451-dpjo-25-06-59-gf5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/5b8910257e25/2176-9451-dpjo-25-06-59-gf6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/6c91990953c8/2176-9451-dpjo-25-06-59-gf7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/546b21384216/2176-9451-dpjo-25-06-59-gf1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/1bee2d026821/2176-9451-dpjo-25-06-59-gf2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/13a9538a4d88/2176-9451-dpjo-25-06-59-gf3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/b298ce5c455f/2176-9451-dpjo-25-06-59-gf4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/6cb76e307d6c/2176-9451-dpjo-25-06-59-gf5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/5b8910257e25/2176-9451-dpjo-25-06-59-gf6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5139/7869798/6c91990953c8/2176-9451-dpjo-25-06-59-gf7.jpg

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