| 摘要 |
<p>A method and apparatus for forming precisely-positioned holes in the base of cast dental models includes a matrix plate (21) having a polygonal aperture (31) adapted to congruently receive a transparent base plate (22). A dental impression (36) attached to the matrix plate (21) is viewed through the base plate (22), and marks made on the base plate where dowel pins are desired to engage castings of selected parts (39) of the dental impression. The base plate (22) is then removed from the matrix plate, and holes formed therein at the marked locations. A modification (60) useable with non-transparent base plates (62) employs a transparent transfer plate (61) having the same outline shape as the base plate which is inserted into the matrix plate and marked. The transfer plate (61) is then removed, clamped to a base plate (62) with a clamp (63), and holes formed in the base plate at locations indicated by marks on the transfer plate.</p> |
