Comparison between microporous and nanoporous orthodontic miniscrews : An experimental study in rabbits.

IF 1.3 4区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-01-01 Epub Date: 2022-05-20 DOI:10.1007/s00056-022-00398-3

Yueh-Tse Lee, Eric Jein-Wein Liou, Sinn-Wen Chen

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引用次数: 0

Abstract

Purpose: Surface characteristics of orthodontic miniscrews might affect survival rates and removal torque values (RTVs). This experimental study aimed to clarify whether and why a microporous or nanoporous surface promotes higher survival rates and RTVs for orthodontic miniscrews.

Methods: Using a split-leg design, one set each of nonporous (sham control, n = 24) and microporous (control, n = 6), and three sets of nanoporous (experimental, n = 6 per set) miniscrews were implanted in the tibias of 12 New Zealand rabbits and immediately loaded with 1.5 N nickel-titanium coil springs for 12 weeks. The surface morphology, micropores, and nanotube diameters of the miniscrews were examined using scanning electron microscopy and field-emission scanning electron microscopy. The surface composition and thickness were determined using Auger electron spectroscopy. The survival rates and RTVs of each set were assessed.

Results: The nanoporous miniscrews had higher survival rates, RTVs (p < 0.001), and thicker nanotube oxide thicknesses (p < 0.001) than the nonporous and microporous miniscrews. The nonporous and microporous miniscrews had no nanotube structures. The surface oxide composition was titanium dioxide (TiO₂). The threshold RTV, TiO₂ thickness, and nanotube diameter of nanoporous miniscrews needed to promote the experimental survival rate to 100% was determined to be 6.6 ± 0.8 N-cm (p < 0.05), 22.5 ± 4.8 nm (p < 0.05), and 17.6 ± 2.3 nm or above, respectively.

Conclusion: Nanoporous surfaces promoted higher survival rates and RTVs than microporous miniscrews. This could be due to TiO₂ nanotube structures with thicker oxide layers in nanoporous miniscrews.

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微孔和纳米多孔正畸微型螺钉的比较：兔子实验研究。

目的：正畸微型螺钉的表面特性可能会影响存活率和去除力矩值（RTV）。本实验研究旨在阐明微孔或纳米多孔表面是否会提高正畸微型螺丝的存活率和去除力矩值，以及为什么会提高存活率和去除力矩值：采用分腿设计，将无孔（假对照组，n = 24）、微孔（对照组，n = 6）和三组纳米多孔（实验组，每组 n = 6）微型螺钉分别植入 12 只新西兰兔的胫骨，并立即用 1.5 N 镍钛螺旋弹簧加载 12 周。使用扫描电子显微镜和场发射扫描电子显微镜检查了微型螺钉的表面形态、微孔和纳米管直径。使用奥杰电子能谱测定了表面成分和厚度。评估了每组的存活率和 RTV：结果：纳米多孔微型螺钉的存活率和 RTV（p 2）较高。将纳米多孔微型螺钉的实验存活率提高到 100%所需的阈值 RTV、TiO2 厚度和纳米管直径被确定为 6.6 ± 0.8 N-cm（p 结论：纳米多孔表面可提高存活率：纳米多孔表面比微孔微型螺钉具有更高的存活率和 RTV。这可能是由于纳米多孔微型螺杆中的 TiO2 纳米管结构具有更厚的氧化层。

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

Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie 医学-牙科与口腔外科

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Orofacial Orthopedics provides orthodontists and dentists who are also actively interested in orthodontics, whether in university clinics or private practice, with highly authoritative and up-to-date information based on experimental and clinical research. The journal is one of the leading publications for the promulgation of the results of original work both in the areas of scientific and clinical orthodontics and related areas. All articles undergo peer review before publication. The German Society of Orthodontics (DGKFO) also publishes in the journal important communications, statements and announcements.