Biomechanical simulation of segmented intrusion of a mandibular canine using Robot Orthodontic Measurement & Simulation System (ROSS)

IF 3.3 2区医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2024-09-06 DOI:10.1016/j.jmbbm.2024.106720

Hisham Sabbagh, Benedikt Dotzer, Uwe Baumert, Linus Hötzel, Corinna Lesley Seidel, Andrea Wichelhaus

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Abstract

Objective

Aim of this study was to investigate the forces and moments during segmented intrusion of a mandibular canine using Cantilever-Intrusion-Springs (CIS).

Methods

Three different CIS modifications were investigated using a robotic biomechanical simulation system: unmodified CIS (#1, control), CIS with a lingual directed 6° toe-in bend (#2), and CIS with an additional 20° twist bend (#3). Tooth movement was simulated by the apparative robotic stand, controlled by a force-control algorithm, recording the acting forces and moments with a force-torque sensor. Statistical analysis was performed using Shapiro-Wilk, Kolmogorov-Smirnov, Kruskal-Wallis ANOVA and post hoc tests with Bonferroni correction (α = 0.05).

Results

The initial intrusive force, which was uniformly generated by a 35° Tip-Back bend, decreased significantly (p < 0.05) from 0.31 N in group (#1) to 0.28 N in group (#3). Vestibular crown tipping reduced significantly (p < 0.05) from 2.11° in group (#1) and 1.72° in group (#2) to 0.05° in group (#3). Matching to that the direction of orovestibular force significantly (p < 0.05) shifted from 0.15 N to vestibular in group (#1) to 0.51 N to oral in group (#3) and the orovestibular tipping moment decreased also significantly (p < 0.05) from 4.63 Nmm to vestibular in group (#1) to 3.56 Nmm in group (#2) and reversed to 1.20 Nmm to oral in group (#3). Apart from that the orovestibular displacement changed significantly (p < 0.05) from 0.66 mm in buccal direction in group (#1) to 0.29 mm orally in group (#2) and 1.49 mm in oral direction as well in group (#3).

Significance

None of the modifications studied achieved pure mandibular canine intrusion without collateral effects. The significant lingual displacement caused by modification (#3) is, not least from an aesthetic perspective, considered much more severe than a slight tipping of the canine. Consequently, modification (#2) can be recommended for clinical application based on the biomechanical findings.

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使用机器人正畸测量和模拟系统（ROSS）对下颌犬牙分段侵入进行生物力学模拟

方法使用机器人生物力学模拟系统研究了三种不同的 CIS 改良方法：未经改良的 CIS（1 号，对照组）、带有舌向 6° 趾内弯曲的 CIS（2 号）和带有额外 20° 扭转弯曲的 CIS（3 号）。牙齿运动由apparative机器人支架模拟，由力控制算法控制，并通过力矩传感器记录作用力和力矩。统计分析采用 Shapiro-Wilk、Kolmogorov-Smirnov、Kruskal-Wallis 方差分析和事后检验，并进行 Bonferroni 校正（α = 0.05）。结果由 35° Tip-Back 弯曲均匀产生的初始侵入力显著降低（p <0.05），从 1 号组的 0.31 N 降至 3 号组的 0.28 N。前庭冠倾角从（1 号）组的 2.11°和（2 号）组的 1.72°大幅降至（3 号）组的 0.05°（p <0.05）。与此相匹配的是，口前庭力的方向也明显改变（p < 0.05），从 1 号组（前庭）的 0.15 牛顿变为 3 号组（口腔）的 0.51 牛顿，口前庭倾覆力矩也明显降低（p < 0.05），从 1 号组（前庭）的 4.63 牛顿变为 2 号组（口腔）的 3.56 牛顿，而 3 号组（口腔）的倾覆力矩则变为 1.20 牛顿。此外，口前庭位移也发生了显著变化（p <0.05），从(1＃)组的颊侧 0.66 mm 到(2＃)组的口侧 0.29 mm，以及(3＃)组的口侧 1.49 mm。从美学角度来看，改良方法（3 号）造成的明显舌侧移位要比犬齿的轻微倾斜严重得多。因此，根据生物力学的研究结果，可以建议将（2）号改良方案应用于临床。

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 the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.