Department of Orthodontics, Tianjin Stomatological Hospital, Tianjin, People's Republic of China.
Department of Stomatology, Tianjin Medical University, Tianjin, People's Republic of China.
BMC Oral Health. 2024 Aug 17;24(1):962. doi: 10.1186/s12903-024-04541-x.
This study investigated the characteristics of Monson's sphere in Chinese young adult females with individual normal occlusion to provide a reference for oral rehabilitation in prosthodontic and orthodontic treatments.
Points at the dental cusps and incisal edges were selected from 51 digital mandibular dental models of Chinese young adult females (aged 18-22 years) with individual normal occlusion. Monson's spheres were fitted to the selected points based on the least-squares principle and the radii were calculated. The deviation of each selected point from its relative spherical surface was also calculated. The radii and deviations of these points were examined using conventional descriptive statistics and distributions of the most deviated points inside and outside the spheres were analyzed.
The mean radius of Monson's sphere in Chinese young adult females was 79.60 ± 14.13 mm. The deviation of each selected point from its relative sphere surface was 0.38 ± 0.30 mm. The maximum deviations inside and outside the sphere were 0.93 ± 0.25 mm and 0.95 ± 0.30 mm, respectively. The most deviated points outside the spheres were mainly distributed at the distolingual cusps of the mandibular second permanent molars (31.37%), while those inside the spheres were mainly distributed at the mesiolingual cusps of the mandibular first permanent molars (45.10%).
The radius of Monson's sphere in Chinese young adult females was smaller than the classic four-inch value suggested by Monson. Deviation was observed from all selected points to their Monson's sphere surface, with the most deviated points distributed primarily in the molar region.
本研究旨在探讨具有正常个体牙合的中国年轻成年女性孟氏球的特征，为口腔修复学和正畸治疗中的义齿和正畸治疗提供参考。
从 51 例具有正常个体牙合的中国年轻成年女性（18-22 岁）的数字下颌牙模型中选择牙尖和切缘点。根据最小二乘法原理，将孟氏球拟合到所选点，并计算半径。还计算了每个所选点相对于其相对球面的偏差。使用常规描述性统计方法检查这些点的半径和偏差，并分析球内和球外最偏置点的分布。
中国年轻成年女性孟氏球的平均半径为 79.60±14.13mm。每个所选点相对于其相对球体表面的偏差为 0.38±0.30mm。球内和球外的最大偏差分别为 0.93±0.25mm 和 0.95±0.30mm。球外最偏置的点主要分布在下颌第二恒磨牙的远中尖（31.37%），而球内最偏置的点主要分布在下颌第一恒磨牙的近中舌尖（45.10%）。
中国年轻成年女性孟氏球的半径小于孟森经典的四英寸值。所有所选点均与孟氏球表面存在偏差，最偏置点主要分布在磨牙区。
