摘要
目的:研究安氏Ⅱ1错牙合高角、低角病例颅面部生长发育特征、磨牙倾斜度与颅面生长发育垂直向不调的相关性。方法:80例安氏Ⅱ1错牙合高角、低角病例进行X线头影测量分析。结果:1.高角病例SNA,SNB均减小、ANB略增大、NP-FH减小,下颌骨长度过小。低角病例SNA,SNB正常,ANB略增大,NP-FH正常,下颌骨长度正常。2.高角病例下颌升支高度(Ar-Go)明显缩短,致后面高(S-Go)过小而前面高、上面高、下面高均正常,低角病例后面高(S-Go)偏大,前面高、下面高均减小。3.U6-OP,U6-SN°,L6-MP°,U6-L6°(P<0.01)。结论:1高角病例上下颌骨相对于颅底的前后向关系后缩且下颌骨长度过小,下颌相对后缩更明显。低角病例的上下颌骨与颅底前后关系基本正常。2.高角病例面前后比例失调,使下颌向后下旋转伴有开牙合趋势,低角病例面前后比例失调,使下颌向前上旋转,而有深覆牙合趋势。3.在咬合平面及前颅底平面上高角病例上磨牙近中倾斜度大于低角病例。在下颌平面上高角病例下磨牙的倾斜度大于低角病例。磨牙倾斜度在一定程度上可以反映颅面生长发育趋势,尤其是与颅面结构的垂直向不调有很大的关系。
Objective：To study the correlation between the characteristics of craniofacial growth and development , molar inclination and not adjusted vertical direction of craniofacial growth and development in Angle class Ⅱ division Ⅰmalocclusion with high and low angle. Method：The analysis of X cephalometrics of 80 cases with Angle class Ⅱ divisionⅠmalocclusion and high and low angle. Result：①.In the cases with high angle,∠SNA and∠SNB reduced,∠ANB slight-ly increased,NP-FH reduced,and the length of the mandible was too short. In the cases with low angle,∠SNA and ∠SNB were normal,∠ANB slightly increased,NP-FH was also normal,the length of the mandible was normal. ②.In cases with high angle,Ar-Go was significantly shorter,leading to S-Go was too small and N-Me,N-ANS,ANS-Me were normal. In cases with low angle,S-Go is relatively large,N-Me and ANS-Me reduced.③U6-OP,U6-SN°,L6-MP° U6-L6°（P〈0.01）. Conclusion：①.In the cases with high angle,the sagittal relationship between maxilla,mandible and the cranial base was ret-rognathia,the length of the mandible was too small,and the mandibular retrusion was more obvious. In the cases with low angle,the sagittal relationship between maxilla,mandible and the cranial base was normal. ②.In cases with high angle,the sagittal imbalance leads to the trend of opening bite,because the lower jaw backward and rotate. In cases with low angle,the sagittal imbalance leads to the trend of deep overbite,because the lower jaw forward and rotate. ③.Maxillary Molars inclina-tion in cases with high angle was greater than in cases with low angle at occlusal plane and anterior cranial base plane. Mandibular molar inclination in cases with high angle was greater than in cases with low angle at the mandibular plane. Mo-lar inclination certainly reflected the trend of craniofacial development,Especially to the vertical imbalance of craniofacial structures.
出处
《临床口腔医学杂志》
2014年第7期421-423,共3页
Journal of Clinical Stomatology
