PROBLEM TO BE SOLVED: To provide a spacer for a keeper of a dental magnetic attachment, which is used for forming a space to house the keeper on a root surface plate when casting the root surface plate for fixing the keeper of the dental magnetic attachment on an abutment tooth by a lost wax process, and makes it possible to cast the root surface plate capable of adopting the keeper for which the height from the tooth surface of the abutment tooth to the surface on the permanent magnet structure side of the keeper is as low as possible and an area to be in contact with the permanent magnet structure is as large as possible.SOLUTION: The spacer for the keeper of the dental magnetic attachment comprises: a planted part 1 for which a shape almost the same as the part other than the oral cavity inner side of the keeper is formed using a fireproof material having the almost same thermal expansion coefficient as a fireproof buried material, and which is planted in the wax and a projected part 2 which is united with the planted part 1 and projected from the wax, and for which a boundary 2a with the planted part 1 can be visually recognized.COPYRIGHT: (C)2009,JPO&INPIT【課題】歯科用磁性アタッチメントのキーパを支台歯上に固定する根面板をロストワックス法により鋳造する際に根面板にキーパを収容する空間を形成するために用いるものであって、特に支台歯の歯面上からキーパの永久磁石構造体側の面までの高さは可及的に低く且つその永久磁石構造体と接する面積がなるべく大きいキーパを採用することが可能な根面板を鋳造することができる歯科用磁性アタッチメントのキーパ用スペーサを提供する。【解決手段】歯科用磁性アタッチメントのキーパ用スペーサを、耐火埋没材と略同じ熱膨張率を有する耐火性材料を用いて、キーパの口腔内側以外の部位と略同一の形状を成しワックスに埋入される埋入部位1と、埋入部位1と一体を成し埋入部位1との境界2aが目視により認識できるワックスから突出する突出部位2とで構成する。【選択図】図2
