PROBLEM TO BE SOLVED: To provide a master model for dental technique capable of enhancing holding force between a dowel pin and a support base.SOLUTION: A support base 10 for supporting a fixing plate 6 includes: an upper wall 14 having an insertion openings 18 for inserting dowel pins 8 and a peripheral-side wall 16 extending downward from an outer peripheral edge of the upper wall 14. Both sides of the upper wall 14 of the support base 10 include a pair of external engagement projections 22 and 24, and both sides of the insertion openings 18 include a pair of internal engagement projection rows 42 and 44 consisting of a plurality of internal engagement projections 46 and 48, where the internal engagement projections 46 and 48 include first projection bodies extending from the upper wall 14, and first small projections extending from the first projection bodies. Further, the fixing plate 6 includes a pair of external engagement recesses 50 corresponding to the pair of external projections 22 and 24, and a pair of internal engagement recess rows corresponding to the pair of internal engagement projection rows 42 and 44.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】ダウエルピンと支持基台との間の保持力を高めることができる歯科技工用作業模型を提供すること。【解決手段】固定用プレート6を支持するための支持基台10は、ダウエルピン8を挿通するための挿通開口18が設けられた上壁14と、上壁14の外周縁部から下方に延びる周側壁16とを有している。支持基台10の上壁14の両側部には、一対の外係合突部22,24が設けられ、また挿通開口18の両側に複数の内係合突部46,48からなる一対の内係合突部列42,44が設けられ、内係合突部46,48は、上壁14から延びる第1突部本体と、第1突部本体から延びる第1小突部とを有している。一方、固定用プレート6には、一対の外係合突部22,24に対応して一対の外係合凹部50が設けられ、また一対の内係合突部列42,44に対応して一対の内係合凹部列が設けられている。【選択図】図2
