Al-Rayes Naim Z, Hajeer Mohammad Y
Specialist and Clinical Lecturer, Department of Orthodontics, University of Al-Baath Dental School, Syrian Arab Republic.
Associate Professor, Department of Orthodontics, University of Damascus Dental School, Damascus, Syrian Arab Republic.
J Contemp Dent Pract. 2014 Jan 1;15(1):46-55. doi: 10.5005/jp-journals-10024-1486.
(1) To evaluate the applicability of using 3D digital models in the assessment of the magnitude of occlusal contacts by measuring occlusal contact surface areas (OCSAs) and 3D mesh points in 'contact' (OCMPs) in a sample of orthodontic patients; (2) To detect any sex differences in the magnitude of occlusal contacts in all malocclusion groups; (3) To detect inter- group differences; (4) To assess possible correlations between occlusal contacts and other dental characteristics.
Study casts of 120 malocclusion patients were selected and divided into 4 groups (class I division 1, class II division 1, class II division 2, class III) with equal numbers for both sexes. 3D digital models were produced using O3DM™ technology. Occlusal contacts were quantified using two methods of measuring.
(1) No significant sexual differences were detected for OCMPs (mesh points) and OCSAs (mm(2)) in all groups. (2) There were statistically significant differences among malocclusion groups for OCMPs and OCSAs (p < 0.001). Tukey's HSD post- hoc tests showed that class III patients had significantly less occlusal contacts than other malocclusion groups. (3) Stepwise multiple regression equations showed that overjet, lower arch width and overbite could explain approximately 19.5% of the total variance of OCSAs and OCMPs.
Sexual differences in occlusal contacts were not detected. Class I division 1 patients had the highest amount of occlusal contacts among all groups of malocclusion. Overjet, overbite and lower dental arch width were best predictors of occlusal contacts in the current sample.
（1）通过测量正畸患者样本中的咬合接触表面积（OCSA）和“接触”中的三维网格点（OCMP），评估使用三维数字模型评估咬合接触大小的适用性；（2）检测所有错牙合畸形组中咬合接触大小的性别差异；（3）检测组间差异；（4）评估咬合接触与其他牙齿特征之间的可能相关性。
选取120例错牙合畸形患者的研究模型，分为4组（安氏I类1分类、安氏II类1分类、安氏II类2分类、安氏III类），每组男女数量相等。使用O3DM™技术制作三维数字模型。采用两种测量方法对咬合接触进行量化。
（1）所有组中，OCMP（网格点）和OCSA（mm²）均未检测到显著的性别差异。（2）错牙合畸形组之间的OCMP和OCSA存在统计学显著差异（p < 0.001）。Tukey's HSD事后检验显示，安氏III类患者的咬合接触明显少于其他错牙合畸形组。（3）逐步多元回归方程显示，覆盖、下牙弓宽度和覆牙合可解释OCSA和OCMP总方差的约19.5%。
未检测到咬合接触的性别差异。在所有错牙合畸形组中，安氏I类1分类患者的咬合接触量最高。在当前样本中，覆盖、覆牙合和下牙弓宽度是咬合接触的最佳预测指标。
