Influence of Sandblast Treatments with Several Alumina Particles on the Surface Texture of CP Titanium

DOI 10 Citations 17 References
  • FUJISHIMA Akihiro
    Department of Oral Biomaterials and Technology, Showa University School of Dentistry
  • MIYAZAKI Takashi
    Department of Oral Biomaterials and Technology, Showa University School of Dentistry
  • FUJISHIMA Yukari
    The Third Department of Prosthodontics, Showa University School of Dentistry
  • SHIBA Akihiko
    The Third Department of Prosthodontics, Showa University School of Dentistry

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  • チタンの表面性状に及ぼすアルミナ・サンドブラスト処理の影響

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Abstract

We examined conditions for sandblast treatment to both CP titanium(CP Ti)and cobaltchrome alloy(Co-Cr)used as a control, to fabricate a veneered titanium crown using a non-mechanical retention bead method.Three average particle sizes of alumina(50, 110 and 250μm)were used at a pressure of 0.25〜0.45 MPa for 5〜30 seconds to examine the changes of surface texture on CP Ti and Co-Cr.Weight loss of cp Ti by sandblasting treatment increased with the increase of treatment time linearly, but there was little effect from particle size.Weight loss of Co-Cr was greater than that of CP Ti, but volume loss of Co-Cr was almost equal from that of CP Ti.Alumina particles were clearly observed on the sandblasted surface by backscattered electron(BSE)image, and the area percentage of alumina detected on the picture analysis from BSE image was 54〜61% when treated for 10 seconds at 0.45 MPa.EPMA showed the amount of alumina was 33〜45 wt% on CP Ti and 22〜42 wt% on Co-Cr, respectively.Alumina content on the specimen was larger when treated with 50μm alumina particle than 250μm, but was not affected by treating time and pressure.The decreases in pressure from 0.45 to 0.25 MPa decreased the deformation of the CP Ti plate significantly, but did not decrease the surface roughness.Those results suggested that lower pressure and shorter treatment time were suitable for sandblasting titanium compared to those needed for other dental alloys.Furthermore, we need information on both the bonding of metal and the alumina surface to clarify bonding to alumina sandblasted metals.

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