(二)初級(jí)彎曲
口腔科學(xué)

        初級(jí)彎曲(primary curvature):牙本質(zhì)小管在牙尖部及根尖部的小管較直,而在牙頸部則彎曲呈“～”形,稱(chēng)為初級(jí)彎曲,其近牙髓的一端較粗,越向表面越細(xì)且排列稀疏。Primary curvature:Dentinal tubules at the tip of the cusp and theapex are straight, while a    （共 359 字）     [閱讀本文] >>