口腔颌面外科学（PPT课件讲稿）阻生牙拔牙术

节阻生牙拔牙术

第二节阻生牙拔牙术

other Nature is generous when it cones to our teeth. First, we get baby teeth; next we grow permanent teeth; and finally around age 16 or 1, we start getting a set of molars called wisdom teeth

Mother Nature is generous when it comes to our teeth. First, we get baby teeth; next we grow permanent teeth; and finally, around age 16 or 17, we start getting a set of molars called wisdom teeth

lote: by convention, when we view patients' images light and left are reversed so that it appears that you are standing in front of the person looking at them. any mention of " right"or left"on this site refers to the patient's right or left

 Note: by convention, when we view patients' images, right and left are reversed so that it appears that you are standing in front of the person looking at them. Any mention of "right" or "left" on this site refers to the patient's right or left

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Figure 1.11. Large dentigerous cyst associated with an impacted lower third molar. The mandible is weakened the molar region by the presence of the cyst

(a)

Figure 1. 14(a) Erupted lower third molar with three curved roots- potentially an unpleasant surprise for the unwary exodontist without a pre-operative radiograph (b) Impacted upper canines- the radiograph gives vital information about the position, depth, angulation and relations of these teeth

第生牙 mpacted tooth) 口概念 节阻生牙拔牙术 □由于各种原因(骨或软组织 障碍)导致其部分萌出或完 全不能萌出,且以后也不能 萌出的牙

阻生牙(impacted tooth) 概念 由于各种原因（骨或软组织 障碍）导致其部分萌出或完 全不能萌出，且以后也不能 萌出的牙。 第 二 节 阻 生 牙 拔 牙 术

第生牙 mpacted tooth) 节 口原因 口1颌骨发育不足,无足够间隙容纳全部萌出 的牙。 生口2颌骨结构异常导致的牙齿萌出异常。 牙 口3牙齿发育过程中的位置、形态、数目以及 拔 萌出过程中的各种障碍导致的异常。 牙

阻生牙(impacted tooth) 原因：  1.颌骨发育不足，无足够间隙容纳全部萌出 的牙。  2.颌骨结构异常导致的牙齿萌出异常。  3.牙齿发育过程中的位置、形态、数目以及 萌出过程中的各种障碍导致的异常。 第 二 节 阻 生 牙 拔 牙 术

下颌阻生第三磨牙拔除术 口(-) Anatomy 口1骨板颊侧厚舌侧薄 第三磨牙 口2牙根与下颌管的关系复杂 国 第二磨牙 口3颊侧有颊长神经,舌侧有舌 第一磨牙 神经 第二前磨牙 口4.下颌角处骨质薄弱抗外力 第一前磨牙 差 尖牙 口5智齿形态变异大:、根 侧切牙 中切牙

一、下颌阻生第三磨牙拔除术 （一）Anatomy  1.骨板颊侧厚舌侧薄  2.牙根与下颌管的关系复杂  3.颊侧有颊长神经, 舌侧有舌 神经  4.下颌角处骨质薄弱,抗外力 差  5.智齿形态变异大:冠、根