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Publication Metadata only Properties of experimental copper-aluminiumnickel alloys for dental post-and-core applications(2014-01-01) Apiwat Rittapai; Somchai Urapepon; Julathep Kajornchaiyakul; Choltacha Harniratisai; Mahidol University; National Metal and Materials Technology Center (MTEC)PURPOSE: This study aimed to develop a copper-aluminium-nickel alloy which has properties comparable to that of dental alloys used for dental post and core applications with the reasonable cost. MATERIALS AND METHODS: Sixteen groups of experimental... copper alloys with variants of 3, 6, 9, 12 wt% Al and 0, 2, 4, 6 wt% Ni were prepared and casted. Their properties were tested and evaluated. The data of thermal, physical, and mechanical properties were analyzed using the two-way ANOVA and Tukey's testPublication Metadata only Shear bond strength between autopolymerizing acrylic resin and Co-Cr alloy using different primers(2012-10-30) Sasiwimol Sanohkan; Somchai Urapepon; Choltacha Harnirattisai; Chakrit Sirisinha; Panya Sunintaboon; Mahidol UniversityThis study aimed to examine the shear bond strength between cobalt chromium alloy and autopolymerizing acrylic resin using experimental primers containing 5, 10, and 15 wt% of 4-methacryloxyethyl trimellitic anhydride or 1, 2, and 3 wt% of 3...-methacryloxypropyl-trimethoxysilane comparison to 5 commercial primers (ML primers, Alloy primer, Metal/Zirconia primer, Monobond S, and Monobond plus). Sixty alloy specimens were sandblasted and treated with each primer before bonded with an acrylic resinPublication Metadata only Development of Metal-resin Composite Restorative Material Part 4 Flexural Strength and Flexural Modulus of Metal-resin Composite using Ag-In Alloy Particles as Filler(2002-01-01) Kiyoshi Kakuta; Somchai Urapepon; Yukio Miyagawa; Hideo Ogura; Masahiko Yamanaka; Chatcharee Suchatlampong; Apiwat Rittapai; Nippon Dental University; Mahidol UniversityThe flexural strength and flexural modulus of an experimental metal-resin composite, which used Ag-In alloy particle as the filler, were evaluated. The effect of acid treatment and heat treatment on the Ag-In alloy particle was investigated... of HCl of the acid treatment. A metal-resin composite, which used acid-treated and 350°C heat-treated Ag-In alloy fillers, matched the requirement of strength of ISO 4049. The average of flexural modulus of the experimental metal-resin composite was 9Publication Metadata only Electrochemical corrosion of titanium and titanium-based alloys(2001-01-01) Chotiros Kuphasuk; Yoshiki Oshida; Carl J. Andres; Suteera T. Hovijitra; Martin T. Barco; David T. Brown; Indiana University-Purdue University Indianapolis; Mahidol University; Indiana University School of DentistryStatement of problem. Two varieties of unalloyed titanium, Ti-6Al-4V and NiTi, commonly are used in medical and dental fields. Several other types of alloys for potential use in these fields have been developed, including Ti-4.5Al-3V-2Mo-2Fe... and vanadium-free alloys (Ti-5Al-2.5Fe and Ti-5Al-3Mo-4Zr). The corrosion of these alloys under simulated physiologic conditions is not known. Purpose. This study compared the corrosion behaviors of 6 titanium materials through electrochemical polarizationPublication Metadata only Improvement of mechanical and biological properties of TiNi alloys by addition of Cu and Co to orthodontic archwires(2016-01-01) Aphinan Phukaoluan; Anak Khantachawana; Pongpan Kaewtatip; Surachai Dechkunakorn; Julathep Kajornchaiyakul; King Mongkut s University of Technology Thonburi; Mahidol University; Thailand National Metal and Materials Technology Center© 2016 CEO The purpose of this study was to investigate improved performances of TiNi in order to promote tooth movement. Special attention was paid to the effect on the clinical properties of TiNi of adding Cu and Co to this alloy. Ti49.4Ni50.6, Ti...49Ni46Cu5and Ti50Ni47Co3(at %) alloys were prepared. Specimens were cold-rolled at 30% reduction and heat-treated at 400 °C for 60 min. Then, the test results were compared with two types of commercial archwires. The findings showedPublication Metadata only Quantitative analysis of metallic artifacts caused by dental metals: Comparison of cone-beam and multi-detector row CT scanners(2011-12-01) Jira Chindasombatjaroen; Naoya Kakimoto; Shumei Murakami; Yoshinobu Maeda; Souhei Furukawa; Osaka University; Mahidol University. Methods: Cubes of aluminum, titanium, cobalt-chromium alloy, and type IV gold alloy were scanned with CBCT and MDCT scanners at tube voltages of 80 and 100 peak kV (kVp), and currents of 100 and 170 mAs by MDCT, and 102 and 170 mAs by CBCT. Artifact areas... were quantified using ImageJ software. Results: Artifact areas for the same metals and imaging parameters were smaller with CBCT than with MDCT under most conditions. Type IV gold alloy caused the largest artifact areas, followed by cobalt-chromiumPublication Metadata only Improvement of mechanical and biological properties of TiNi alloys by addition of Cu and Co to orthodontic archwires(2016-01-01) Aphinan Phukaoluan; Anak Khantachawana; Pongpan Kaewtatip; Surachai Dechkunakorn; Julathep Kajornchaiyakul; King Mongkut s University of Technology Thonburi; Mahidol University; Thailand National Metal and Materials Technology CenterPublication Metadata only Development of Metal-Resin Composite Restorative Material Part 1 Experimental Composite using Silver-Tin Alloy as Filler and 4-META as Coupling Agent(1999-01-01) Kiyoshi Kakuta; Somchai Urapepon; Yukio Miyagawa; Hideo Ogura; Chatcharee Suchatlampong; Apiwat Rittapai; Nippon Dental University; Mahidol UniversityMetal-resin composites, using metal particles instead of inorganic particles as the filler and 4- META as the coupling agent, were experimentally prepared under 20 different conditions (five different concentrations of 4-META, and four different contents of metal particles). The flexural strength of the prepared metal-resin composites was in the range of about 14.5-61.3 MPa. The flexural strength was significantly influenced by the 4-META concentration, the metal particle content and their interaction. The highest strength was estimated at 2-3 mass% of 4-META concentration and 92.0-93.5 mass% metal filler content. The flexural modulus of the metal resin composite ranged approximately from 7.8 GPa to 15.5 GPa. The flexural modulus of the metal resin composite significantly increased with the metal particle content. The effect of the 4- META concentration on the flexural modulus was not significant.Publication Metadata only Comparison of friction forces between stainless orthodontic steel brackets and TiNi wires in wet and dry conditions(2017-03-01) Aphinan Phukaoluan; Anak Khantachawana; Pongpan Kaewtatip; Surachai Dechkunakorn; Niwat Anuwongnukroh; Peerapong Santiwong; Julathep Kajornchaiyakul; King Mongkut s University of Technology Thonburi; Mahidol University; Thailand National Metal and Materials Technology Centerthe frictional forces between a stainless steel bracket and five different wire alloys under dry and wet (artificial saliva) conditions. TiNi, TiNiCu, TiNiCo, commercial wires A and commercial wires B with equal dimensions of 0.016 × 0.022′′ were tested... roughness testing. Static and kinetic friction forces were measured using a custom-designed apparatus, with a 3-mm stretch of wire alloy at a crosshead speed of 1 mm/min. The static and dynamic frictions in the wet condition tended to decrease more slowlyPublication Metadata only New Initiation System for Resin Polymerization using Metal Particles and 4-META(2000-01-01) Yukio Miyagawa; Somchai Urapepon; Hideo Ogura; Narimichi Honda; Nippon Dental University; Mahidol University; Sun Medical Co., Ltd., Co, and In particles could initiate the polymerization of the monomer in combination with BPO and 4-META when they were moistened with water. All the three kinds of silver alloy particles examined also could initiate the polymerization, although pure