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首页> 外文期刊>European journal of orthodontics >Effects of extraction of four premolars on vermilion height and lip area in patients with bimaxillary protrusion
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Effects of extraction of four premolars on vermilion height and lip area in patients with bimaxillary protrusion

机译:四个前磨牙拔除对双颌前突患者朱红高度和唇面积的影响

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摘要

The purpose of this study was to evaluate the effects of orthodontic treatment, involving the extraction of four premolars, on vermilion height and lip area. Twenty-eight female patients (mean 21.9 ± 3.1 years) who were diagnosed with bimaxillary protrusion were selected for this study to be treated by extraction of four premolars. The control group consisted of 28 female volunteers (mean 25.0 ± 3.0 years) with Angle Class I normal occlusion. Frontal photographs of the patients were taken both before and after the orthodontic treatment in resting position. Thirty-five landmarks on the upper and lower lips were identified for the measurements of vermilion height and lip area. Lateral cephalograms were taken before and after active orthodontic treatment, and linear and angular measurements were performed. The mean pre-treatment values of vermilion height and lip area were significantly greater in the treatment group than those of the control group and decreased significantly after the orthodontic treatment towards the values in the control group. There were no significant differences in the vermilion height and lip area between the post-treatment and the control groups, except for lower lip area values. Significant correlations found between the changes in incisor position and the changes in vermilion height were few in number for the upper lip but greater in number for the lower lip. Thus, the results of this study show that bimaxillary protrusion cases can be treated by the extraction of four premolars to produce an aesthetic improvement in frontal facial features.
机译:这项研究的目的是评估正畸治疗的效果,包括拔除四个前磨牙对朱红高度和嘴唇面积的影响。本研究选择了28名女性患者(平均21.9±3.1岁),诊断为双上颌前突,将其通过提取四个前磨牙进行治疗。对照组由28位女性志愿者(平均25.0±3.0岁)组成,其角度为I级正常闭塞。在静止位置正畸治疗之前和之后均拍摄了患者的正面照片。识别出上下嘴唇上的35个界标,以测量朱红高度和嘴唇面积。在积极正畸治疗之前和之后进行侧位脑电图检查,并进行线性和角度测量。在治疗组中,朱砂高度和唇部面积的平均治疗前值显着高于对照组,在正畸治疗后,治疗前的朱红色高度和唇部面积的平均值相对于对照组显着降低。除较低的嘴唇面积值外,治疗后和对照组之间的朱红色高度和嘴唇面积没有显着差异。在门齿位置变化和朱红色高度变化之间发现了显着的相关性,上唇的数量很少,而下唇的数量更大。因此,这项研究的结果表明,可以通过提取四个前磨牙来治疗双上颌前突病例,从而改善额叶面部特征。

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