| 单词 | crusta petrosa |
| 释义 | > as lemmascrusta petrosa c. crusta fibrosa, crusta petrosa, the cement of a tooth (cement n. 4). ΘΚΠ the world > life > the body > digestive or excretive organs > digestive organs > mouth > substance or parts of teeth > [noun] > cement cementum1842 crusta fibrosa1842 cement1849 1842 R. Dunglison Med. Lexicon (ed. 3) at Tooth At the part where the enamel terminates at the cervix of the tooth, the crusta petrosa or cortical substance commences in an extremely thin stratum. 1876 T. Bryant Pract. Surg. (ed. 2) I. xiii. 537 The crusta petrosa is formed on the gradually elongating root through the agency of the dental sac or capsule which surrounds the forming tooth crown. 1911 Encycl. Brit. XXVI. 501/1 Surrounding the dentine where it is not covered by enamel is the ‘cement’ or ‘crusta petrosa’, a thin layer of bone. 1949 F. W. Jones et al. Buchanan's Man. Anat. (ed. 8) v. 266 Cement, or crusta petrosa. This covers the dentine that forms the root of the tooth. < as lemmas |
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