Kasimoglu Yelda, Tuna Elif Bahar, Rahimi Boragh, Marsan Gulnaz, Gencay Koray
Cranio. 2015 Jan;33(1):10-4. doi: 10.1179/0886963414Z.00000000039. Epub 2014 Apr 14.
The purpose of this study was to investigate the relationship between vertical asymmetries of the mandibular condyle with different occlusion types, including Angle Cl I, Cl II, Cl III malocclusions and unilateral posterior crossbite (UPC) in adolescent patients.
A total number of 120 patients (60 girls, 60 boys with a mean age of 13.64 ± 1.58 years) with no signs and symptoms of temporomandibular disorders were included in the study [n = 30 for each group; Group I: normal occlusion, Group II: Angle Class II malocclusion, Group III: Angle Class III malocclusion and Group IV: UPC]. The asymmetry index for each patient was measured using panoramic radiographs. The results were analyzed using Kruskal-Wallis and Mann-Whitney U test at the 95% confidence level.
The results of the analyses showed no statistically significant differences between the gender and the age of the patients for condylar height asymmetry (P>0.05). No statistically significant difference was found between the occlusion types, according to condylar asymmetry level. The patients with UPC showed a significantly different level of condylar height asymmetry compared to the Class I, II and III occlusion types (P<0.05; P<0.01).
Patients with UPC have asymmetric condylar heights. These patients might be at risk for developing skeletal mandibular asymmetries in the future. Early correction of posterior crossbite can help practitioners prevent skeletal asymmetries.
本研究旨在调查青少年患者下颌髁突垂直不对称与不同咬合类型之间的关系，包括安氏I类、II类、III类错牙合以及单侧后牙反牙合（UPC）。
本研究纳入了120例无颞下颌关节紊乱体征和症状的患者（60名女孩，60名男孩，平均年龄13.64±1.58岁）[每组30例；第一组：正常咬合，第二组：安氏II类错牙合，第三组：安氏III类错牙合，第四组：UPC]。使用全景X线片测量每位患者的不对称指数。结果采用Kruskal-Wallis检验和Mann-Whitney U检验进行分析，置信水平为95%。
分析结果显示，患者的性别和年龄在髁突高度不对称方面无统计学显著差异（P>0.05）。根据髁突不对称程度，咬合类型之间未发现统计学显著差异。与I类、II类和III类咬合类型相比，UPC患者的髁突高度不对称水平存在显著差异（P<0.05；P<0.01）。
UPC患者存在髁突高度不对称。这些患者未来可能有发展为下颌骨骨骼不对称的风险。早期纠正后牙反牙合有助于医生预防骨骼不对称。
