PROBLEM TO BE SOLVED: To provide a polishing material for PMTC (professional mechanical tooth cleaning) effective for removing biofilms and stains on the tooth surface or between the teeth without giving excessive roughening to the tooth surface.SOLUTION: The polishing material for PMTC is produced by compounding (A) a silicic anhydride having an average particle diameter of 1-5 &mum and an oil absorption of 30-70 mL/100 g with (B) a silicic anhydride having an average particle diameter of 6-12 &mum and an oil absorption of 100-130 mL/100 g, wherein the compounding ratio of the silicic anhydride (A) to (B) is 1:3 to 2:1, the content of the silicic anhydride (A) is &ge10 wt.%, that of the silicic anhydride (B) is &ge10 wt.%, and the sum of the compounding amount of the silicic anhydrides (A) and (B) is 35-80 wt.%. A polishing material for PMTC free from the damaging trouble on the tooth surface can be produced by the method.COPYRIGHT: (C)2008,JPO&INPIT【課題】歯牙表面に過度の凹凸を与えることなく、歯牙表面や歯間部のバイオフィルムやステインを除去することができるPMTC用研磨材を提供する。【解決手段】平均粒子径が1~5μm、吸油量が30~70mL/100gである無水ケイ酸(A)と平均粒子径が6~12μm、吸油量が100~130mL/100gである無水ケイ酸(B)を配合し、無水ケイ酸(A)と(B)の配合比が1:3~2:1であり、無水ケイ酸(A)を10重量%以上、無水ケイ酸(B)を10重量%以上配合し、無水ケイ酸(A)と(B)の配合量の合計が、35~80重量%であるPMTC用研磨材。これにより、歯牙表面の損傷を与えないPMTC研磨材提供することができる。【選択図】なし
