Effect of occlusal hypofunction on centre of resistance in maxillary central incisor using the finite element method.

IF 1.4 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Journal of Orthodontics Pub Date : 2024-03-01 Epub Date: 2023-06-02 DOI:10.1177/14653125231176575

Kachaphol Kuharattanachai, Dhirawat Jotikasthira, Wetchayan Rangsri, Kanich Tripuwabhrut

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Abstract

Objectives: To determine differences in the location of centre of resistance (Cres) between functional and hypofunctional teeth and to evaluate the relationship between the pulp cavity volume and locations of the Cres, using the finite element (FE) method.

Design: Retrospective cohort study.

Participants: FE models of right maxillary central incisor, derived from cone-beam computed tomography (CBCT) images of 46 participants, were divided into normal function (n = 23) and hypofunction (n = 23) groups using anterior overbite and cephalometric measurements.

Methods: Measurements of the tooth and pulp cavity volume were made from the CBCT. Cres levels were presented as percentages of the root length from the root's apex. All data were analysed and compared using the independent t-test (P < 0.05). The relationship between the location of Cres and volume ratios were evaluated statistically.

Results: The means of the pulp cavity/tooth volume and root canal/ root volume ratio of the maxillary central incisor in the anterior open bite group were significantly greater than those in the normal group. The average location of Cres in the anterior open bite group was 0.6 mm (3.7%) apically from the normal group, measured from root apex. The difference was statistically significant (P < 0.01). There was a significant correlation between root canal/root volume ratio and locations of Cres (r = -0.780, P < 0.001).

Conclusions: The Cres in the hypofunctional group was located more apical than the functional group. As the pulp cavity volume increased, the level of Cres shifted apically.

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使用有限元方法研究咬合功能减退对上颌中切牙阻力中心的影响。

目的：使用有限元（FE）方法确定功能性牙齿和低功能性牙齿阻力中心（Cres）位置的差异，并评估牙髓腔体积与阻力中心位置之间的关系：设计：回顾性队列研究：根据 46 名参与者的锥束计算机断层扫描（CBCT）图像制作的右上颌中切牙有限元模型，通过前咬合和头颅测量将其分为功能正常组（n = 23）和功能低下组（n = 23）：通过 CBCT 测量牙齿和牙髓腔的体积。牙髓水平以从牙根顶点算起的牙根长度的百分比表示。所有数据均采用独立 t 检验进行分析和比较（P < 0.05）。对 Cres 位置与体积比之间的关系进行了统计评估：结果：前开咬合组上颌中切牙的牙髓腔/牙体积和根管/根体积比的平均值明显大于正常组。从根尖开始测量，前方开放咬合组的 Cres 平均位置比正常组的根尖高 0.6 毫米（3.7%）。差异具有统计学意义（P < 0.01）。根管/牙根体积比与 Cres 的位置之间存在明显的相关性（r = -0.780，P < 0.001）：结论：功能低下组的 Cres 位于根尖，高于功能组。随着牙髓腔容积的增加，Cres的位置也向顶端移动。

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 Orthodontics DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

2.60

自引率

15.40%

发文量

期刊介绍： The Journal of Orthodontics has an international circulation, publishing papers from throughout the world. The official journal of the British Orthodontic Society, it aims to publish high quality, evidence-based, clinically orientated or clinically relevant original research papers that will underpin evidence based orthodontic care. It particularly welcomes reports on prospective research into different treatment methods and techniques but also systematic reviews, meta-analyses and studies which will stimulate interest in new developments. Regular features include original papers on clinically relevant topics, clinical case reports, reviews of the orthodontic literature, editorials, book reviews, correspondence and other features of interest to the orthodontic community. The Journal is published in full colour throughout.