【填空题】
4、DMFS___。
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答案
即龋、失、补牙面数。龋指龋坏尚未充填的牙面；失指因龋丧失的牙面；补指因龋已做充填的牙面：牙面数是指患者口腔内这些牙面数之和。DMFS是龋病流行病学调查中最常用的指数
解析
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