Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, São Paulo, 17012-901, Brazil.
Am J Orthod Dentofacial Orthop. 2010 Jan;137(1):14.e1-7; discussion 14-5. doi: 10.1016/j.ajodo.2009.08.022.
The aim of this study was to investigate the prevalence of tooth wear in adolescents with Class II malocclusion, compared with those with normal occlusion.
The sample consisted of dental casts obtained from 310 subjects, divided into 3 groups: group 1, 110 subjects with normal occlusion (mean age, 13.51 years); group 2, 100 complete Class II Division 1 patients (mean age, 13.44 years); and group 3, 100 half-cusp Class II Division 1 patients (mean age, 13.17 years). Dental wear was assessed by using a modified version of the tooth-wear index. The 3 groups were compared by means of the Kruskal-Wallis and Dunn tests, considering the frequency and the severity of wear on each surface of each group of teeth. The level of statistical significance was set at 5%.
The normal occlusion group had statistically greater tooth wear on the palatal surfaces of the maxillary central incisors and the incisal surfaces of the maxillary canines than the corresponding surfaces in both Class II malocclusion groups. The complete and half-cusp Class II Division 1 malocclusion groups had statistically greater tooth wear on the occlusal surfaces of the maxillary second premolar and first molar, the occlusal surfaces of the mandibular premolars, and the buccal surfaces of the mandibular posterior teeth compared with the normal occlusion group. The half-cusp Class II Division 1 malocclusion group had significantly greater tooth wear on the incisal surfaces of the mandibular incisors compared with the complete Class II Division 1 malocclusion group.
Subjects with normal occlusion and complete or half-cusp Class II Division 1 malocclusions have different tooth-wear patterns. Tooth wear on the malocclusion subjects should not be considered pathologic but rather consequent to the different interocclusal tooth arrangement.
本研究旨在调查安氏 II 类错（牙合）青少年的牙齿磨损患病率，并与正常（牙合）者进行比较。
本研究的样本由 310 名患者的牙模组成，分为 3 组：第 1 组 110 名正常（牙合）者（平均年龄 13.51 岁）；第 2 组 100 名完全安氏 II 类 1 分类错（牙合）患者（平均年龄 13.44 岁）；第 3 组 100 名半骀安氏 II 类 1 分类错（牙合）患者（平均年龄 13.17 岁）。采用改良的牙齿磨损指数评估牙齿磨损情况。通过 Kruskal-Wallis 和 Dunn 检验比较 3 组间的差异，同时考虑各组牙齿各面的磨损频率和严重程度。统计学显著性水平设定为 5%。
与安氏 II 类错（牙合）组相比，正常（牙合）组上颌中切牙腭面和上颌尖牙切缘的牙齿磨损更严重。完全性和半骀安氏 II 类 1 分类错（牙合）组上颌第二前磨牙和第一磨牙的颌面、下颌前磨牙的颌面和下颌后牙的颊面磨损更严重。与完全性安氏 II 类 1 分类错（牙合）组相比，半骀安氏 II 类 1 分类错（牙合）组下颌切牙切缘的牙齿磨损更严重。
正常（牙合）和完全性或半骀安氏 II 类 1 分类错（牙合）患者的牙齿磨损模式不同。错（牙合）患者的牙齿磨损不应视为病理性的，而应归因于不同的牙（牙合）接触关系。
