骨性Ⅱ类与Ⅰ类错畸形患者第二恒磨牙萌出和钙化时间的比较  

The Difference in the Chronology and Calcification of Second Molars between Class Ⅰ and Class Ⅱ Occlusions

作　　者：王凡涛[1] 郭泾[1] 张本君[1] 席茹[1] 王秀印[1] 

机构地区：[1]山东大学口腔医学院正畸科,山东济南250012

出　　处：《潍坊医学院学报》2009年第2期144-146,共3页Acta Academiae Medicinae Weifang

基　　金：山东省自然基金资助课题(课题编号:2005C46)

摘　　要：目的研究骨性Ⅱ类与骨性Ⅰ类错畸形患者第二恒磨牙的萌出位置和钙化时间上的差异。方法对平均年龄为11.2岁的220例患者的治疗前病历资料进行分析,其中19%为骨性Ⅰ类错畸形,32%为上颌骨骨性Ⅱ类错畸形,49%为下颌骨骨性Ⅱ类错畸形。结果各错畸形组中第二恒磨牙钙化阶段的分布相近,骨性错畸形类型与第二恒磨牙的发育阶段没有明显相关性。在骨性Ⅱ类错畸形组最大年龄组(12岁以上),上颌第二恒磨牙的萌出位置更偏向。结论上颌骨骨性Ⅱ类错畸形中,上颌第二恒磨牙萌出较早,但钙化时间没有差异。Objective The diffence in the times of eruption and calcification Of the second molars between skeletal class Ⅰ and Ⅱ were studied.Methods Pretreatment records of 220 patients with a mean age of 11.2 years were evaluated.About 19% of them had skeletal class Ⅰ,32% had skeletal maxillary class Ⅱ,and 49% had skeletal mandibular class Ⅱ malocclusions.Results The distribution of the various developmental stages in each malocclusion group was similar,and no association between skeletal malocclusion and dental developmental stage of the second molars was encountered.The eruptive position of the maxillary second molars was more occlusal only in the oldest maxillary class Ⅱ group,above 12 years of age.Conclusion The maxillary second molars may erupt earlier in patients with skeletal maxillary class Ⅱ malocclusions,no differences of the calcification between class Ⅰ and Ⅱ groups.

关 键 词：恒磨牙 萌出 钙化 

分 类 号：R783.5[医药卫生—口腔医学]