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微型计算机断层扫描评估早期生长过程中未成熟下颌管形态和位置的变化。

Micro-CT assessment of changes in the morphology and position of the immature mandibular canal during early growth.

作者信息

Hutchinson E F, Florentino G, Hoffman J, Kramer B

机构信息

School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.

Department of Radiation Sciences, South African Nuclear Energy Corporation, Pelindaba, South Africa.

出版信息

Surg Radiol Anat. 2017 Feb;39(2):185-194. doi: 10.1007/s00276-016-1694-x. Epub 2016 May 13.

Abstract

PURPOSE

The mandibular canal contributes to the development and growth of the mandible, as it acts as a conduit for the growing inferior alveolar neurovascular structures. A clear understanding of the canal's pathway is, therefore, important in interpreting the growth pattern of the inferior alveolar neurovascular bundle. This study investigated the position of the mandibular canal within the body of the mandible and its general dimensions within a pediatric collection of mandibles.

METHODS

The sample included 45 mandibles and was subdivided into three: group 1 (30 gestational weeks to birth), group 2 (birth to 12 months), and group 3 (1 to 4 years). Mandibles were scanned using a Nikon XTH 225L micro-CT unit. Scanning conditions ranged between 85 kV/83 µA and 100 kV/100 µA. Measurements included: the maximum width and height of the mandibular canal and distances between the mandibular canal and the relevant surfaces of the mandible. Data analysis included an ANOVA, MANOVA, and principal component analysis.

RESULTS

The mandibular canal increased significantly in size from 30 gestational weeks to 12 months relative to the deciduous molar crypts. Postnatally, the mandibular canal increased significantly in height at the level of the second deciduous molar crypt. The canal lies closer to the buccal surface in the region of the first and second deciduous molar teeth.

CONCLUSION

The consistency in the positioning of the mandibular canal within the body of the mandible may assist in predicting the occurrence of aberrant growth patterns, particularly during the initial stages of growth.

摘要

目的

下颌管对下颌骨的发育和生长有重要作用,因为它是下牙槽神经血管结构生长的通道。因此,清楚了解下颌管的走行对于解读下牙槽神经血管束的生长模式很重要。本研究调查了下颌管在下颌骨体内的位置及其在一组儿童下颌骨中的大致尺寸。

方法

样本包括45例下颌骨,分为三组:第1组(孕30周至出生)、第2组(出生至12个月)和第3组(1至4岁)。使用尼康XTH 225L微型CT设备对下颌骨进行扫描。扫描条件在85 kV/83 µA至100 kV/100 µA之间。测量内容包括:下颌管的最大宽度和高度以及下颌管与下颌骨相关表面之间的距离。数据分析包括方差分析、多变量方差分析和主成分分析。

结果

相对于乳牙牙胚,下颌管从孕30周至12个月时尺寸显著增大。出生后,在下第二乳牙牙胚水平处,下颌管高度显著增加。在第一和第二乳牙区域,下颌管更靠近颊侧表面。

结论

下颌管在下颌骨体内位置的一致性可能有助于预测异常生长模式的发生,尤其是在生长初期。

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