1、一般来说,健康成人的正常牙都有32颗恒牙,不同区域的牙齿功能和形态各有差异的。有的是分开的,有的则是融合到一起的,基本也都是扁锥形的。
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2、切牙:主要分布在上下左右各有4对,一共有8颗,主要功能是切割食物,对我们的发音的标准也会有影响,还会影响我们的脸部美观,最好的状态是大小形态及位置与面形、口唇相协调。
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3、尖牙:位于侧切牙远中、口角部位,上下左右共有4颗,即上尖牙、下尖牙。对于面部的影响也会很大,支撑着起口唇,如果缺失尖牙容易导致口角出现塌陷下垂,主要功能是撕裂食物。
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4、磨牙:上下左右各三颗,一共12颗,位于双尖牙的远中。磨牙是口腔中最重要的功能齿,过早缺损磨牙容易导致咀嚼功能下降,甚至影响到颞颌关节,导致面型发育异常、咬合疼痛等。担负主要的咀嚼,磨碎食物。
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5、牙齿从纵剖面可以看到有三层硬组织和一层软组织,即牙釉质、牙本质、牙骨质和牙龈,前面三种硬组织又称为牙体。
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