下颌第二前磨牙（mandibular second premolar）较下颌第一前磨牙体积大。
下颌第二前磨牙 (mandibular second premolar)：牙冠呈方圆形，其长度、宽度和厚度儿乎相等。分为二尖型和三尖型。
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...molar ) 牙冠特点：颊面、舌面、近中面、远中面、牙合面 牙根的特点 下颌第二前磨牙(The Second Permanent Mandibular Premolar) 牙冠特..
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释义下颌左第二前磨牙 Mandibular left second premolar tooth
下颌第二前磨牙是最常见的缺失的牙齿，而上颌侧切是第二大。
Mandibular second premolars are the most frequently missing teeth while maxillary lateral incisors are second-most.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
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