PROBLEM TO BE SOLVED: To provide an excellent-operability tooth extraction tool wherein the transmission loss of force is prevented or suppressed.SOLUTION: This tooth extraction tool 1 includes a grip part 2, and a shaft part 3 extending from the grip part 2, and the shaft part 3 has an insertion part 4 inserted into a periodontal ligament space 300 between a tooth 100 and an alveolar bone 200. A portion facing to the alveolar bone 200 of the shaft part 3 in a state that the insertion part 3 is inserted in the periodontal ligament space 300 is formed with a friction resistance increase part 5 having a plurality of projections 51. The friction resistance increase part 5 is formed in a region including a fulcrum P2 when operating the tooth extraction tool 1 such that a portion contacting with the tooth 100 of the shaft part 3 functions as an application point P3, that a portion contacting with the alveolar bone 200 of the shaft part 3 functions as the fulcrum P2, and that the grip part 2 functions as a power point P1.COPYRIGHT: (C)2013,JPO&INPIT【課題】操作性に優れる抜歯器具を提供すること。【解決手段】抜歯器具1は、把持部2と、把持部2から延出する軸部3とを有し、軸部3は、歯牙100と歯槽骨200との間の歯根膜腔300に挿入される挿入部4を有している。また、挿入部3を歯根膜腔300に挿入した状態にて、軸部3の歯槽骨200と対向する部位には、複数の突起51を有する摩擦抵抗増大部5が設けられている。摩擦抵抗増大部5は、軸部3の歯牙100と接触する部位が作用点P3として、軸部3の歯槽骨200と接触する部位が支点P2として、把持部2が力点P1として働くように操作したとき、支点P2を含む領域に設けられている。【選択図】図3
