J Jpn Prosthodont Soc 51: 11-21, 2007 Analysis of Polished Surfaces of Titanium Castings Miura Eiji, Takayama Yasuko, Kawai Yoshiyuki, Hosoi Toshio an

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1 J Jpn Prosthodont Soc 51: 11-21, 2007 Analysis of Polished Surfaces of Titanium Castings Miura Eiji, Takayama Yasuko, Kawai Yoshiyuki, Hosoi Toshio and Mizuno Yukihiro* The First Department of Prosthetic Dentistry, Tsurumi University School of Dental Medicine * D ental Technician Training Institute, Tsurumi University School of Dental Medicine Received on April 28, 2006/Accepted on November 6, 2006

2 Polishing methods of Titanium

3 Polishing methods of control for mirror finishing Polishing methods of control for inner

4 The roughness (Ra) Qualitative analysis of abrasive materials Qualitative analysis of each specimens

5 sections specimen Vickers hardness cross section as cast Ti

7) Jang KS, Youn SJ, KimYS. Comparison of Castability and Surface Roughness of Commercially Pure Titanium and Cobalt-chromium Denture Frameworks. J Prothet Dent. 86: 93-98, 2001.

8 7) Jang KS, Youn SJ, KimYS. Comparison of Castability and Surface Roughness of Commercially Pure Titanium and Cobalt-chromium Denture Frameworks. J Prothet Dent. 86: 93-98, ) Guilherme AS, Henriques GEP, Zavanelli RA et al. Surface roughness and fatigue performance of commercially pure titanium and Ti-6A1-4V alloy after different polishing protocols. J Prothet Dent. 93: , FAX: miura-e@tsurumi-u. ac. jp

チタン研磨面の表面分析図4 map analysis チタンas cast試 Ti as casts 図5 段左からSi,P,Caの map analysis を示す map analysis Ti inner 上段左からCOMPO像,Ti,下段左からNa,Mg, Ti mirror finishing 段左からAl,Siの分析像を示す分析像

9 チタン研磨面の表面分析図4 map analysis チタンas cast試 Ti as casts 図5 段左からSi,P,Caの map analysis を示す map analysis Ti inner 上段左からCOMPO像,Ti,下段左からNa,Mg, Ti mirror finishing 段左からAl,Siの分析像を示す分析像を示すチタン鏡面研磨面の面分析像上段左からCOMPO像,Ti,下チタン適合研磨面の面分析像料の面分析像上段左からCOMPO像,Ti,O,中 Al,下図6 specimen 19 図7 map analysis Au-Pt inner 白金加金適合研磨面の面分析像段左からAl,Siの分析像上段左からCOMPO像,C,O,中 Ag,下段左からPt,Auの段左からCu,Pd, 分析像を示す

10 20 図8 補綴誌51巻1号(2007) map analysis Co-Cr inner コバルトクロム適合研磨面の面分析像上段左からC0MPO像,N,F,中図10 Ti mirror 段左からAl,Si,P, 下段左からCr,Co,Moの map and line analysis finishing cross section チタン鏡面研磨面の断面試料の面および線分析像上段左からCOMPO像,Ti,下分析像を示す段左は0の右に各元素の線分析結果を示す.黄分析であり,ラインがMINにである.チタン表面には0も面分析像で, 色いラインはTiの線なったところが金属最表面認められない.チタン表面より右側は包埋樹脂である. 図9 map and line analysis cross sections Ti as casts 断面試料の面および線分析像上段左からCOMPO像,Ti,O,中段左からSi,PのおいてAは Ti inner チタンascastの Al,下図11 チタン,Bは面分析像を示す.COMPO像に示されいラインはTiの線分析であり,ラインがMINになったところが金属最表面である.この境界部にはMg,Al,O,Si等のラインの上昇がみられる. line analysis 上段左からTi,O,下にているそれぞれの色のライン間の線分析を行っている.下段右に各元素の線分析結果を示す.青 and cross section チタン適合研磨面の断面試料の面および線分析像段左からNa,Mg, 埋没材である.Map上 map 段左はPの面分析像で,右素の線分析結果を示す.青いラインはTiのラインがMINにに各元線分析であり, なったところが金属最表面である,チン表面にはわずかに0,Pのラインの上昇が見られる. タ

11 Analysis of Polished Surfaces of Titanium Castings Miura Eiji, Takayama Yasuko, Kawai Yoshiyuki, Hosoi Toshio and Mizuno Yukihiro* The First Department of Prosthetic Dentistry, Tsurumi University School of Dental Medicine, *Dental Technician Training Institute, Tsurumi University School of Dental Medicine J Jpn Prosthodont Soc 51: 11-21, 2007 ABSTRACT Purpose The aim of this research was to obtain an objective grasp properties of titanium castings which are polished using a titanium polishing method developed by our university. Methods The specimens were cast conventionally using commercially pure (CP) titanium (Grade 3, T-alloy H, GC). The cast s were polished using two methods ; a conventional procedure for mirror s and a modified procedure consisting of minimal grinding foracceptable fit inner. The center line average roughness (Ra) wasmeasured, and then qualitative analysis and map analysis were performed using Electron Probe X-ray Microanalysis. In addition, map and line analysis on sections as-cast titanium specimens was performed, and the Vickers hardness was measured. As controls, Au-Pt alloy and Co-Cr alloy specimens were analyzed. Results The Ra on the titanium inner was 1.52,um, which was approximately four times higher than that on the mirror, and approximately two times higher than that for the Au-Pt alloy and Co-Cr alloy. The qualitative analysis titanium mirror detected elements such as C, Si, and Al as well as the ingot element. In addition, P was also detected on the titanium inner. The Vickers hardness was highest on the outermost layer, which decreased remarkably until a depth of gm. Conclusions It was considered that the mirror formed by the titanium polishing method in our university obtained a level equivalent to that of precious metals. However, a reaction layer and elements derived from the investment material remained in the titanium inner. Key words polishing, titanium castings, inner,

Fig. 1 Sampling positions from the ingot. Table 2 Chemical compositions of base metal (%) Fig. 2 (unit: mm) Shape and size of fatigue test specimen. T

Fig. 1 Sampling positions from the ingot. Table 2 Chemical compositions of base metal (%) Fig. 2 (unit: mm) Shape and size of fatigue test specimen. T Friction welding of ADC 12 aluminum alloy diecastings Kazuyoshi KATO* and Hiroshi TOKISUE* Both squeeze and gravity castings of ADC 12 aluminum alloy were friction-welded, using a brake type welding machine.