牙齒後端 的英文怎麼說
中文拼音 [yáchǐhòuduān]
牙齒後端
英文
heel of denture-
The six - year molars are the first permanent molars which erupt at the age of six. there are a total of four six - year molars, one in each quadrant, situated right behind the last primary molars. the four molars are vital to the normal occlusion of permanent teeth
小朋友六歲時,他下頜乳臼齒後面長出大牙齒,即第一大臼齒,共有四隻,位置在口腔四端乳臼齒的後面,由於通常在六歲左右長出,故稱為六歲齒。
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