Lee Brian
Aust Orthod J. 2010 May;26(1):1-9.
The dimensions of the roots of the teeth are important in the assessment of orthodontic anchorage and to estimate the forces to be used during orthodontic tooth movement.
To investigate the relations between the lengths, widths and projected areas of the roots of the permanent teeth.
Intact, extracted human permanent teeth were photographed and the lengths, widths and projected areas of selected surfaces measured. Descriptive statistics and associations between selected linear dimensions and root areas were calculated.
The data showed significant kurtosis and skewness. Neither exponential nor polynomial transformations improved the goodness of fit, and there was no a priori reason to use other than linear regression. When the lengths of all teeth were multiplied by the respective widths of the mesial, distal and lingual surfaces, the correlations between the product of length and width and area improved in 28 out of 30 surfaces. In the lower arch the correlation coefficients ranged from r = .343 (mesial surface first premolar) to r = .845 (mesial surface of the canine). The correlations in the upper arch ranged from r = .201 (mesial surface of the second molar) to r = .847 (mesial surface lateral incisor).
For clinical purposes, root length may be an acceptable indicator of root area. Low correlations were attributed to variations in root shape.
牙齿牙根的尺寸在正畸支抗评估以及估计正畸牙齿移动过程中所使用的力量方面很重要。
研究恒牙牙根的长度、宽度和投影面积之间的关系。
对完整的拔除人类恒牙进行拍照，并测量选定表面的长度、宽度和投影面积。计算选定线性尺寸与牙根面积之间的描述性统计量和相关性。
数据显示出显著的峰度和偏度。指数变换和多项式变换均未改善拟合优度，并且除线性回归外没有先验理由使用其他方法。当所有牙齿的长度乘以近中、远中和舌侧表面各自的宽度时，30个表面中有28个表面的长度与宽度乘积和面积之间的相关性得到改善。在下颌牙弓中，相关系数范围从r = 0.343（第一前磨牙近中表面）到r = 0.845（尖牙近中表面）。在上颌牙弓中，相关性范围从r = 0.201（第二磨牙近中表面）到r = 0.847（侧切牙近中表面）。
出于临床目的，牙根长度可能是牙根面积的可接受指标。低相关性归因于牙根形状的变化。
