Correlation between coronal and apical arch form and degree of divergence: a volumetric computed tomography analysis.

ORAL and Implantology Pub Date : 2017-01-21 eCollection Date: 2017-10-01 DOI:10.11138/orl/2017.10.4.424

L Lombardo, F Veronesi, V Candotto, M Nardone, G Siciliani

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Abstract

Purpose: To determine the existence of any correlation between the degree of divergence and apical and coronal arch form using cone-beam computed tomography (CBCT).

Materials and methods: A total of 176 (88 coronal and 88 apical) CBCT scans pertaining to a sample of 44 subjects (16 males and 28 females), of which 26 were Class I, 14 Class II and 4 Class III, were analysed. A lateral projection of the skull was obtained from each VCT and cephalometric tracing was performed (according to Ricketts) so as to divide the sample into subgroups based on the degree of divergence (11 short-faced, 18 norm-faced and 15 long-faced subjects). Dahlberg's index values were calculated and Student's t-test for paired data was applied.

Results: On the whole, the hyperbolic cosine curve was found to be the most representative of the arch forms considered.

Conclusions: A correlation between degree of divergence and the arch form of the apical and, especially, coronal portions of both the upper and lower jaws was revealed.

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冠状和根尖弓形态与发散程度的相关性:体积计算机断层扫描分析。

目的:利用锥束计算机断层扫描(CBCT)确定分化程度与根冠状弓形态之间是否存在相关性。材料和方法:对44名受试者(16名男性，28名女性)共176张CBCT扫描(88张冠状和88张根尖)进行分析，其中26张为ⅰ类，14张为ⅱ类，4张为ⅲ类。从每个VCT上获得颅骨的侧向投影，并进行头部测量追踪(根据Ricketts)，以便根据差异程度将样本分为亚组(11名短脸，18名标准脸和15名长脸受试者)。计算Dahlberg指数值，采用配对数据的Student’st检验。结果:总体而言，双曲余弦曲线是最具代表性的拱型。结论:分化程度与上颌和下颌骨的尖部，特别是冠状部的弓形之间存在相关性。

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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ORAL and Implantology Dentistry-Dentistry (all)

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