| 摘要 |
A retentive dental pin comprising in sequence a lower portion which can be secured within the dentine of a tooth, and a head portion to which a tooth restoration may be secured, a detachable connection, and a fixing portion attached to the head portion by the detachable connection, characterised in that the head portion is connected to the lower portion by dentine-engaging structure comprising an inwardly and downwardly extending surface carrying grooves shaped to screw into the dentine. |
