【单选题】【消耗次数：1】
McSherry建议依据埋伏阻生牙CBCT影像资料的特点来评估正畸牵引治疗的难度以及成功率，评估要点包括
①
尖牙牙冠水平重叠相邻切牙牙根的面积，重叠越多即水平距离越靠近中线，牵引成功率越低
②
尖牙牙冠的垂直高度，牙冠的高度位于从牙釉质交界处到侧切牙根的中点以下的区域，则牵引成功的几率较大，位置越高成功几率越低
③
尖牙牙冠与正中矢状面所成角度，成角为0-15°时，牵引成功率较高，成角大于30°时成功率较低
④
尖牙牙根所在的水平位置，约在尖牙位置时成功率最高，其余位置成功率大大降低
⑤
以上均有
参考答案：
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相关题目
【单选题】
提高VABC成功率的因素？
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妊娠不足39周的自然临产
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子宫颈管消失75%～90%、宫口扩张
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本次分娩距前次剖宫产>18个月、产妇年龄<35岁
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产妇体重指数（BMI）<30kg/m2
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下列哪项不是提高VABC成功率的因素。
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本次分娩距前次剖宫产＞18个月
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孕妇年龄＜35岁
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BMI＜30kg/m2
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妊娠不足39周的自然临产
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无阴道分娩史
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