Insertion torque, flexural strength and surface alterations of stainless steel and titanium alloy orthodontic mini-implants: an in vitro study.

Q2 Medicine

Dental Press Journal of Orthodontics Pub Date : 2024-05-20 eCollection Date: 2024-01-01 DOI:10.1590/2177-6709.29.2.e2423282.oar

Gustavo Lopes Puls, Guido Artemio Marañón-Vásquez, Christian Andrew Vargas Ramos, Caio Luiz Bitencourt Reis, Andréa Cândido Dos Reis, Maria Bernadete Sasso Stuani, Fábio Lourenço Romano, Mírian Aiko Nakane Matsumoto

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引用次数: 0

Abstract

Objective: This study aimed to compare the insertion torque (IT), flexural strength (FS) and surface alterations between stainless steel (SS-MIs) and titanium alloy (Ti-MIs) orthodontic mini-implants.

Methods: Twenty-four MIs (2 x 10 mm; SS-MIs, n = 12; Ti-MIs, n = 12) were inserted on artificial bone blocks of 20 lb/ft3 (20 PCF) and 40 lb/ft3 (40 PCF) density. The maximum IT was recorded using a digital torque meter. FS was evaluated at 2, 3 and 4 mm-deflection. Surface topography and chemical composition of MIs were assessed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). General linear and mixed models were used to assess the effect of the MI type, bone density and deflection on the evaluated outcomes.

Results: The IT of Ti-MIs was 1.1 Ncm greater than that obtained for the SS-MIs (p= 0.018). The IT for MIs inserted in 40 PCF test blocks was 5.4 Ncm greater than that for those inserted in 20 PCF test blocks (p < 0.001). SS-MIs inserted in higher density bone (40 PCF) had significantly higher flexural strength than the other groups, at 2 mm (98.7 ± 5.1 Ncm), 3 mm (112.0 ± 3.9 Ncm) and 4 mm (120.0 ± 3.4 Ncm) of deflection (p< 0.001). SEM evidenced fractures in the Ti-MIs. EDS revealed incorporation of 18% of C and 2.06% of O in the loaded SS-MIs, and 3.91% of C in the loaded Ti-MIs.

Conclusions: Based on the findings of this in vitro study, it seems that SS-MIs offer sufficient stability and exhibit greater mechanical strength, compared to Ti-MIs when inserted into higher density bone.

查看原文本刊更多论文

不锈钢和钛合金正畸微型植入体的插入扭矩、抗弯强度和表面变化：体外研究。

目的：本研究旨在比较不锈钢（SS-MIs）和钛合金（Ti-MIs）正畸微型种植体的插入扭矩（IT）、抗弯强度（FS）和表面改变：在密度分别为 20 磅/立方英尺（20 PCF）和 40 磅/立方英尺（40 PCF）的人工骨块上植入 24 个微型种植体（2 x 10 毫米；SS-MIs，n = 12；Ti-MIs，n = 12）。使用数字扭矩仪记录最大 IT 值。在挠度为 2、3 和 4 毫米时对 FS 进行评估。通过扫描电子显微镜（SEM）和能量色散 X 射线光谱（EDS）评估了 MIs 的表面形貌和化学成分。采用一般线性模型和混合模型评估 MI 类型、骨密度和偏转对评估结果的影响：结果：Ti-MI 的 IT 值比 SS-MI 高 1.1 Ncm（p= 0.018）。插入 40 PCF 试验块的 MI 的 IT 值比插入 20 PCF 试验块的 MI 高 5.4 Ncm（p < 0.001）。插入较高密度骨（40 PCF）的 SS-MI 在偏转 2 毫米（98.7 ± 5.1 Ncm）、3 毫米（112.0 ± 3.9 Ncm）和 4 毫米（120.0 ± 3.4 Ncm）时的抗弯强度明显高于其他组别（p< 0.001）。扫描电子显微镜（SEM）显示，钛-MI 存在断裂。EDS 显示，加载的 SS-MI 中含有 18% 的 C 和 2.06% 的 O，而加载的 Ti-MI 中含有 3.91% 的 C：根据这项体外研究的结果，SS-MIs 与 Ti-MIs 相比，在插入密度较高的骨骼时，似乎具有足够的稳定性和更强的机械强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dental Press Journal of Orthodontics Dentistry-Orthodontics

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

27 weeks

期刊介绍： The Dental Press Journal of Orthodontics publishes scientific research articles, significant reviews, clinical and technical case reports, brief communications, and other materials related to Orthodontics and Facial Orthopedics.