| 摘要 |
A dental instrument 1 for measuring a prepared tooth 103 for mounting a dental crown comprises a handle 2, a head 3 and a jaw 4. Jaw 4 comprises a static 4a and moveable 4b arms; the distance between the two arms 4a, 4b can be varied. Each arm 4a, 4b may have inclined surfaces 12, 13, the angles of inclination of which can be varied. There may be indicator markings (31, 32 fig 6A) which may be used to gauge the angle of inclination of flexible indicators (24a, 24b fig 6A). Moveable arm 4b may have a slider 5 retained within the handle 2. Handle 2 may have apertures 8a, 8b and lugs 11a, 11b extending through them. Arms 4a, 4b may each have a pair of feet 20a, 20b at their distal ends which may extend at an angle. Handle 2 may include a feeler gauge (15 fig 7) which may pivot around a point on the handle 2. The angle of convergence can be measured using this instrument. |
