Importance

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Abstract

An improved device for measuring an inclination angle of the tapered surface of a plaster die duplicated from the prepared tooth in the field of restorative dentistry is disclosed. The device is used also for scraping operation for the was pattern. It includes a turnable tool holding plate which is turnably held in a slot formed on the lower part of a core so as to turn about a support shaft. A rotary ring with its lower end face cut to a predetermined inclination angle, for instance, 7 degrees is rotatably fitted onto the core in such a manner that the lower inclined face comes in contact with the upper faces of wing-shaped lateral projections of the tool holding plate with a transversely extending shaft disposed therebetween. The transversely extending shaft is inserted through the tool holding plate at the same inclination angle as that of the lower inclined end face of the rotary ring so that its axis intersects with the axis of the support shaft. When a tool on the tool holding plate is to be inclined, a lock ring is loosened and the rotary ring is rotated by an operator's hand. When the rotary ring is rotated by 90 degrees, the tool is caused to incline by 7 degrees. When it is further rotated by 180 degrees, the tool is inclined by 14 degrees. A number of calibration lines are impressed over the peripheral surface of the rotary ring.

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First Claim