摘要
目的从三维影像分析安氏Ⅱ类亚类错牙合畸形的颅颌面结构,阐明安氏Ⅱ类亚类错牙合畸形的发生机制,为制定临床矫治方案提供依据。方法选取2011年7月至2013年10月佛山市第一人民医院正畸科收治的安氏Ⅱ类亚类错牙合畸形患者17例为研究组。同期选取在校大学生个别正常牙合志愿者16名为对照组。应用三维测量软件Mimics10.01对两组研究对象进行下颌骨、牙牙合相关项目测量。结果 (1)安氏Ⅱ类亚类错牙合下颌骨除髁突高度外,其余测量项目左右侧差异均无统计学意义(均P>0.05);(2)安氏Ⅱ类亚类错牙合中性关系侧与正常牙合相比在升支长度、体部长度、髁突高度、髁突顶点高度等方面差异有统计学意义(均P<0.05);(3)安氏Ⅱ类亚类错牙合远中关系侧与正常牙合相比在升支长度、体部长度、下颌角点宽度、乙状切迹点宽度、髁突内外径、髁突顶点高度、髁突顶点宽度等方面差异均有统计学意义(均P<0.05)。(4)研究组两侧上、下颌第一磨牙的位置差异均有统计学意义(均P<0.05),表现为远中关系侧的上颌第一磨牙近中错位和下颌第一磨牙远中错位,且该侧磨牙位置与对照组比较差异均有统计学意义(均P<0.05)。结论安氏Ⅱ类亚类错牙合畸形除乙状切迹点位置外,下颌骨左右侧对称,其升支长度和体部长度较正常牙合偏短。远中关系侧的升支有向内旋转的趋势,牙牙合表现为该侧的上颌第一磨牙近中错位和下颌第一磨牙远中错位。
Objective To evaluate the mandibular and dentoalveolar asymmetry in a group of patients with classⅡ subdivision malocclusion,and to investigate its mechanism in order to provide evidence for clinical treatment.MethodsSeventeen patients with classⅡ subdivision malocclusion and sixteen patients with normal occlusion underwent cone-beam CT evaluation. Mandibular and dentoalveolar asymmetry measurements were performed on these images using Mimics10.01 software. The independent samples t-test and paired t-test were used in statistical analysis.ResultsNo statistically significant differences existed in the right and left sides of classⅡ subdivision malocclusion group except for condylar height. There were significant differences between the classⅠ side of classⅡ subdivision malocclusion group and normal occlusion group in ramal length,mandibular body length,condylar height and the height of the highest point of condyle. Significant differences were found between the class Ⅱside of classⅡ subdivision malocclusion group and normal occlusion group in ramal length,mandibular body length,the width of gonion and incisura mandibulae,condylar width,and the width and height of the highest point of condyle. Significant differences existed between the right and left sides of classⅡ subdivision malocclusion group in the position of maxillary and mandibular first molar.ConclusionExcept for condylar height,classⅡ subdivision malocclusion patients have symmetrical mandibular. The length of mandibular body and ramus is shorter when compared to normal occlusion samples. The ramus in classⅡ side of classⅡ subdivision malocclusion has the trend of rotating inward. The maxillary first molar is in the mesial position and the mandibular first molar is in the distal position in classⅡ side of classⅡ subdivision malocclusion.
出处
《中国实用口腔科杂志》
CAS
2015年第5期290-293,共4页
Chinese Journal of Practical Stomatology
