下颌第二前磨牙拔除对下颌第三磨牙角度的影响
[Influence of the mandibular second premolar extraction on the angulation of the mandibular third molar].
作者信息
Feng Guang-yao, Zou Bing-shuang, Gao Xue-mei, Zeng Xiang-long, Wang Xiu-jing, Yan Yan
机构信息
The First Dental Center, Peking University School and Hospital of Stomatology, Beijing, China.
出版信息
Beijing Da Xue Xue Bao Yi Xue Ban. 2013 Feb 18;45(1):77-80.
OBJECTIVE
To compare the angular changes in the developing mandibular third molars in the mandibular second premolar extraction and non-extraction cases and to determine whether the mandibular second premolar extraction causes favorable rotational changes in the angulations of the developing mandibular third molars and benefits its later eruption.
METHODS
Pretreatment and posttreatment panoramic radiographs were taken from 45 subjects who had been treated by the extraction of the mandibular second premolars and 48 subjects who had been treated without extraction. The horizontal reference plane was used to measure and compare the changes in the angulations of the developing mandibular third molars.
RESULTS
The mean uprighting of the mandibular third molars seen in the extraction group was (5.9±2.5) degrees on the right side and (8.0±3.4) degrees on the left side following treatment. For the nonextraction group the mean uprighting was (1.8±2.4) degrees on the right side and (1.5±2.1) degrees on the left side. There was a statistically significant difference between the groups (P<0.05).
CONCLUSION
Mandibular second premolar extraction might be a helpful procedure on the angulations of the developing mandibular third molars.
目的
比较下颌第二前磨牙拔除病例与非拔除病例中正在发育的下颌第三磨牙的角度变化，确定拔除下颌第二前磨牙是否会使正在发育的下颌第三磨牙的角度产生有利的旋转变化，并有利于其后期萌出。
方法
对45例接受下颌第二前磨牙拔除治疗的受试者和48例未接受拔除治疗的受试者拍摄治疗前和治疗后的全景X线片。使用水平参考平面测量和比较正在发育的下颌第三磨牙的角度变化。
结果
治疗后，拔除组右侧下颌第三磨牙平均直立(5.9±2.5)度，左侧为(8.0±3.4)度。非拔除组右侧平均直立(1.8±2.4)度，左侧为(1.5±2.1)度。两组间差异有统计学意义(P<0.05)。
结论
拔除下颌第二前磨牙可能对正在发育的下颌第三磨牙的角度有帮助。
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