| 摘要 |
1412077 Dental anchor pins B WEISSMAN 24 April 1973 19333/73 Heading A5R A dental anchor comprises a hollow sleeve 48 within which extends a reinforcing core 46 formed to resist axial and rotational displacement with respect to the sleeve, at least one end of the sleeve being resilient to facilitate fitting the anchor in a hole drilled in a tooth. In Fig. 5 the sleeve is of elastomeric material and has a conical end portion 50. The core 46 has portions 54 of reduced thickness to prevent axial displacement and may be of rectangular or square cross-section or be twisted or undulating to prevent rotation. The core 46 may be of metal and has a manufacturing mounting extension 42 joined to the core along a weakened zone 59 to permit fracture thereof from the core. In Fig. 11 the sleeve 48 is of ceramic or porcelain material and has a resilient plug 64 threaded into the end thereof. The sleeve 48 is threaded. |
