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论文摘要

骨性Ⅱ类错牙合下颌牙弓与基骨形态相关性的三维测量研究

Three-dimensional evaluation of the relationship between dental and basal arch forms in skeletal class Ⅱ malocclu-sions

作者:吴佳琪 江久汇 邹薇 许天民 刘学宗

Author:Wu Jiaqi, Jiang Jiuhui, Zou Wei, Xu Tianmin, Liu Xuezong

收稿日期:          年卷(期)页码:2013,31(6):605-605-609

期刊名称:华西口腔医学杂志

Journal Name:West China Journal of Stomatology

关键字:骨性<span>Ⅱ类错牙合畸形,三维测量,牙弓与基骨形态,曲线拟合</span>,

Key words:skeletal class Ⅱ malocclusions,three-dimensional measurement,dental and basal arch forms,curve fitting,

基金项目:

北京市科学技术委员会首都临床特色应用研究基金资助项目(303130219)

中文摘要

目的 用三维数字化模型测量的方法探讨骨性Ⅱ类错牙合畸形患者的下颌牙弓弓形与基骨弓形间的相互关系。方法 对35例骨性Ⅱ类错牙合畸形患者治疗前下颌模型进行扫描,获得三维数字模型,对右侧第一磨牙至左侧第一磨牙的FA点(代表牙弓)、WALA点(代表基骨)进行标定并映射到参考平面得到FA和WALA的映射点,分析其牙弓弓形与基骨弓形及其相关性,并对牙弓和基骨弓形进行曲线拟合。结果 骨性Ⅱ类的下颌牙弓弓形曲线与基骨弓形曲线相关度在尖牙区为0.534,磨牙区为0.873。牙弓与基骨尖牙间宽度的差异无统计学意义(P=0.481),而牙弓与基骨磨牙间宽度的差异具有统计学意义(P结论 骨性Ⅱ类错牙合畸形患者下颌牙弓弓形与对应的基骨弓形在磨牙区高度相关,在尖牙区中度相关;基骨尖牙间宽度与牙弓尖牙间宽度无明显差异,基骨磨牙间宽度则明显大于牙弓磨牙间宽度。

英文摘要

Objective This study aims to investigate the relationship between the dental and basal arch forms of patients with skeletal class Ⅱ malocclusion using three-dimensional virtual models and to generate the best-fit curve for these arch forms.Methods The mandibular dental casts of 35 skeletal class Ⅱ patients were taken prior to treatment and were laser scanned. The facial axis (FA) points, which were used to represent the dental arch, and the WALA points, which were used to represent the basal bone, were identified for each tooth from the right first molar to the left first molar. The Pearson corre-lation coefficients between the intercanine and intermolar widths at the FA and WALA points were determined. Finally, the best-fit curves were generated using the fourth-degree polynomial equation to represent the arch forms.Results A strong correlation was found between the FA and WALA intermolar widths (r=0.873). However, a moderate correlation was observed between the FA and WALA intercanine widths (r=0.534). The difference between the intermolar widths at the FA and WALA points was significant (PConclusion For skeletal class Ⅱ malocclusion patients, the FA and WALA dental intermolar widths showed strong correlation, whereas the FA and WALA intercanine widths exhibited moderate correlation. The FA points were located more labially in the anterior teeth area but more lingually in the posterior teeth area. No statistically significant difference was found between the intercanine FA and WALA widths. The difference between the intermolar widths at the FA and WALA points was significant. The radii of curvature of the FA curve was larger than that of the WALA curve in the anterior teeth area.

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