Effect of different investments and mold temperatures on titanium mechanical properties |
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Authors: | Rodrigues Renata Cristina Silveira Almeida Elanio Pereira de Faria Adriana Cláudia Lapria Macedo Ana Paula de Mattos Maria da Gloria Chiarello Ribeiro Ricardo Faria |
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Institution: | 1. Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan;2. Division of Biomaterials, Kyushu Dental University, Fukuoka, Japan;1. Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal;2. Centre for Mechanical Engineering, University of Coimbra, Portugal;1. Dental Officer (Prosthodontics), 33 Corps Dental Unit, C/o 99 APO, India;2. Professor & Head, Dept of Prosthodontics, Saraswati Dental College, Lucknow, India;3. Associate Professor, Dept of Dental Surgery, Armed Forces Medical College, Pune 40, India;1. Maxillofacial Prosthetics Clinic, Tohoku University Hospital, Sendai, Japan;2. Liaison Center for Innovative Dentistry, Division of Advanced Dental Science and Technology, Tohoku University Graduate School of Dentistry, Sendai, Japan;3. Division of Advanced Dental Science and Technology, Tohoku University Graduate School of Dentistry, Sendai, Japan;4. Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan;5. Maxillofacial Prosthetics Clinic, Tohoku University Hospital, Sendai, ?Japan |
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Abstract: | PurposeThe aim of the present study was to evaluate commercially pure titanium (CP Ti) casting quality when a specific to titanium and a conventional phosphate bonded investments were used under different mold temperatures. For this, the evaluated parameters were surface roughness, bending strength, Vickers microhardness, casting quality by radiographies and microstructure of CP Ti.MethodsWax patterns (28 mm × 3 mm × 1 mm) were invested using two phosphate bonded investments: Rematitan Plus (REM), specific to titanium, and Castorit Super C (CAS), a conventional investment, fired and cooled until reaching two mold temperatures: 430 °C (430) and room temperature (RT). Specimens were cast from CP Ti by plasma. After casting, specimens were radiographically examined and submitted to Vickers microhardness, roughness and bending strength evaluation. Microstructure was analyzed in the center and at the surface of specimen.ResultsQualitative analysis of radiographs showed that specimens which were cast using CAS-RT presented more casting porosities while the specimens which were cast with REM-430 did not present any casting porosity. No significant difference was noted among the groups in the surface roughness and Vickers microhardness data, but the bending strength of the specimens cast using CAS was greater than REM groups. The microstructure of the specimens of the different groups was similar, presenting a feather-like aspect.ConclusionCasting porosities found in the specimens cast using conventional investments (CAS) and lower mold temperatures would limit their use, even mechanical properties were similar than in specimens cast using specific to titanium investment (REM) at temperatures recommended by the manufacturer. |
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