CAJ | 학술논문

目的：用三维数字化模型测量的方法探讨骨性Ⅱ类错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<0.01）。牙弓弓形拟合曲线的曲率半径r为15.194，回归系数R2为0.912；基骨弓形拟合曲线的r为20.250，R2为0.947。结论骨性Ⅱ类错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。
목적：용삼유수자화모형측량적방법탐토골성Ⅱ류착기형환자적하합아궁궁형여기골궁형간적상호관계。방법대35례골성Ⅱ류착기형환자치료전하합모형진행소묘，획득삼유수자모형，대우측제일마아지좌측제일마아적FA점（대표아궁）、WALA점（대표기골）진행표정병영사도삼고평면득도FA화WALA적영사점，분석기아궁궁형여기골궁형급기상관성，병대아궁화기골궁형진행곡선의합。결과골성Ⅱ류적하합아궁궁형곡선여기골궁형곡선상관도재첨아구위0.534，마아구위0.873。아궁여기골첨아간관도적차이무통계학의의（P=0.481），이아궁여기골마아간관도적차이구유통계학의의（P<0.01）。아궁궁형의합곡선적곡솔반경r위15.194，회귀계수R2위0.912；기골궁형의합곡선적r위20.250，R2위0.947。결론골성Ⅱ류착기형환자하합아궁궁형여대응적기골궁형재마아구고도상관，재첨아구중도상관；기골첨아간관도여아궁첨아간관도무명현차이，기골마아간관도칙명현대우아궁마아간관도。
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 (P<0.01). No statistically significant difference was found between the intercanine widths (P=0.481). The radii of curvature of the FA and WALA curves in the anterior teeth area were 15.194 and 20.250, respectively. The re-gression coefficients of the FA and WALA curves were calculated as R2=0.912 and 0.947, respectively. Conclusion 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.