摘要
目的:通过对不同矢状骨面型均角患者水平向指标的测量,分析不同矢状骨面型的水平向特征.方法:收集90例恒牙期均角骨性Ⅰ、Ⅱ、Ⅲ类患者初诊时的头颅侧位片及CBCT资料.应用Dolphin软件测量上下颌尖牙区、前磨牙区及磨牙区的基骨弓、牙槽弓、牙弓宽度及对应牙的颊舌向倾斜角度,采用SPSS 22.0软件包对数据进行统计学分析.结果:均角骨性Ⅲ类的下颌尖牙区、前磨牙区及磨牙区基骨宽度分别为(27.15±2.74)、(39.30±2.82)和(59.97±2.93)mm,牙槽骨宽度依次为(25.38±1.78)、(34.51±2.28)和(47.72±2.73)mm;上颌前磨牙区、下颌尖牙区牙弓宽度分别为(48.70±2.35)和(30.69±2.31)mm,均显著大于骨性Ⅰ类及Ⅱ类(P＜0.01).上颌尖牙区、上下颌磨牙区牙弓宽度分别为(38.88±1.90)、(59.51±3.40)和(56.01±2.86)mm,均显著大于骨性Ⅱ类(P＜0.05).上下颌尖牙区、前磨牙区及磨牙区基骨宽度差分别为(4.69±2.84)、(2.31±2.39)和(3.27±2.05)mm,均显著小于骨性Ⅰ类和Ⅱ类(P＜0.01).与骨性Ⅰ类相比,骨性Ⅱ类上颌尖牙、第一磨牙更舌倾,骨性Ⅲ类上颌第一前磨牙及第一磨牙更颊倾,下颌尖牙及第一前磨牙更舌倾(P＜0.01).结论:在均角患者,骨性Ⅲ类下颌基骨、牙槽骨及上下颌牙弓宽度最宽,更易发生上下颌基骨宽度不调.牙代偿方式在骨性Ⅲ类为上颌牙颊倾,下颌牙舌倾;在骨性Ⅱ类为上颌牙舌倾,下颌牙比较直立.
Abstract
PURPOSE:This study aimed to measure and analyze the transverse indicators of normodivergent patients with different sagittal skeletal malocclusions,to explore the transverse characteristics of different sagittal skeletal malocclusions.METHODS:Lateral cephalograms and CBCT of 90 normodivergent patients with skeletal Class Ⅰ,Ⅱ and Ⅲ in their permanent dentition were collected.Dolphin software was applied to measure the widths of the basal bone,alveolar bone,dental arch and buccolingual inclination angle of the corresponding teeth in the maxillary and mandibular canine,premo-lar and molar areas.SPSS 22.0 software package was applied for statistical analysis of the data.RESULTS:The widths of the mandibular basal bone in canine,premolar and molar areas of skeletal Class Ⅲ were(27.15±2.74),(39.30±2.82)and(59.97±2.93)mm,respectively.The widths of the mandibular alveolar bone of skeletal Class Ⅲ were(25.38±1.78),(34.51±2.28)and(47.72±2.73)mm,respectively.The dental arch widths of the maxillary premolar and mandibular canine areas of skeletal Class Ⅲ were(48.70±2.35)and(30.69±2.31)mm,respectively.The above data of skeletal Class Ⅲ were signifi-cantly larger than those of skeletal Class Ⅰ and Ⅱ(P＜0.01).The dental arch widths of the maxillary canine,maxillary mo-lar and mandibular molar areas of skeletal Class Ⅲ were(38.88±1.90),(59.51±3.40)and(56.01±2.86)mm,respectively,which were significantly larger than those of skeletal Class Ⅱ(P＜0.05).The maxillomandibular width difference of basal bone in the canine,premolar and molar areas of skeletal Class Ⅲ were(4.69±2.84),(2.31±2.39)and(3.27±2.05)mm,respectively,which were significantly less than that of skeletal Class Ⅰ and Ⅱ(P＜0.01).Compared with skeletal Class Ⅰ,the maxillary canines and first molars of skeletal Class Ⅱ had larger lingual inclination level,while the maxillary first pre-molars and first molars of skeletal Class Ⅲ had larger buccal inclination level,the mandibular canines and the mandibular first premolars of skeletal Class Ⅲ had larger lingual inclination level(P＜0.01).CONCLUSIONS:For normodivergent pa-tients,the width of the mandibular base bone,alveolar bone,and maxillary and mandibular dental arch in skeletal ClassⅢ is the widest,which is more likely to have width discrepancy in basal bone.In skeletal Class Ⅲ,the maxillary teeth are buccally inclined,and the mandibular teeth are ingually inclined.In skeletal Class Ⅱ,the maxillary teeth are lingually inclined,and the mandibular teeth are compensatory upright.
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