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目的通过评价11岁牙龄儿童不同矢状骨面型患者第二恒磨牙的萌出位置和发育阶段,分析其与不同矢状骨面型的相关关系。方法选取牙龄11岁错畸形患者74例(根据Becker牙龄评价标准确定牙龄)。根据患者矫治前数字头颅侧位X线片,测量3组患者的SNA角、SNB角、ANB角以及APDI值,依据测量值将其分为骨性Ⅰ类组、下颌骨骨性Ⅱ类组和上颌骨骨性Ⅲ类组。同时根据头颅侧位X线片和数字化曲面断层X线片,测量第二磨牙的萌出高度、角度和发育阶段。采用SPSS16.0软件包进行统计学分析,P<0.05差异具有统计学意义。结果 11岁牙龄儿童在不同矢状骨面型中,上下颌第二恒磨牙萌出高度、角度和发育阶段均未见显著差异(P>0.05);PP长度与上颌第二恒磨牙的萌出高度及发育阶段呈正相关性(P<0.01),与萌出角度呈负相关性(P<0.05);GM长度与上下颌第二恒磨牙的发育阶段呈正相关性(P<0.01),但与下颌第二磨牙的萌出高度和角度无相关性(P>0.05)。结论通过11岁牙龄组的第二恒磨牙萌出高度、角度、发育阶段与不同矢状骨面型相关性分析可推断,11岁牙龄组儿童上颌骨长度越长,上颌第二磨牙萌出高度越高,萌出角度越小,发育时间越早;下颌体长度越长,上下颌第二磨牙发育越早。
Objective To evaluate the eruption position and developmental stage of the second permanent molars in different sagittal patients with 11-year-old children, and to analyze their relationship with different sagittal planes. Methods Totally 74 patients with malformation deformity at the age of 11 years (Dental age determined according to Becker dental evaluation criteria) were selected. The SNA angle, SNB angle, ANB angle and APDI value of the three groups were measured according to the digital cephalometric X-ray before the treatment. According to the measured value, they were divided into skeletal class I group, mandibular skeletal class II group and Maxillary bone Ⅲ group. At the same time, the eruption height, angle and developmental stage of the second molars were measured according to the skull lateral X-ray and digital surface tomography. SPSS16.0 software package for statistical analysis, P <0.05 difference was statistically significant. Results There was no significant difference in the height, angle and developmental stage of the second permanent molars between 11 years old children with different sagittal types (P> 0.05). The correlation between PP length and the eruption height of the second permanent molars (P <0.01), but negatively correlated with the eruption angle (P <0.05). There was a positive correlation between GM length and the developmental stage of the maxillary and mandibular second molars (P <0.01) There was no correlation between the eruption height of the molars and the angle (P> 0.05). Conclusions The eruption height, angle, developmental stage and sagittal type of the second permanent molars in the 11-year-old group can be inferred that the longer the maxilla length in the 11-year-old group, the greater the eruption rate of the second maxillary molars The higher the eruption angle is, the earlier the development is. The longer the mandibular body, the earlier the second molars develop.