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Publication Open Access The potential of copper alloy as alternative material for post and core applications.(2014-09) Somchai Urapepon; สมชาย อุรพีพล; Usanee Peungpaiboon; อุษณีย์ ปึงไพบูลย์; Somchai Urapepon; สมชาย อุรพีพล; Mahidol University. Faculty of Dentistry. Department of ProsthodonticsObjective: The purpose of this study was to investigate the use of copper alloy for dental application. Materials and methods: Three types of copper alloy used in Thailand were selected (Cu-Al, Cu-Al-Ni and Cu-Zn). Ingots of these three alloys... were prepared. The tensile test and potentiodynamic polarization for corrosion test were performed following ISO 1562: 2004 Dentistry-Casting gold alloys and ISO 10271: 2001 Dental metallic materials-Corrosion test method. The ultimate strength, 0Publication 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 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 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 UniversityObjectives: To quantitatively compare the streak artifacts produced by dental metals in a cone-beam computed tomography (CBCT) device and a multi-detector row computed tomography (MDCT) scanner in relation to metal types and imaging parameters.... 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 areasPublication Open Access Effect of cement film thickness on shear bond strengths of two resin cements.(2014-05) Somchai Urapepon; สมชาย อุรพีพล; Wutipong Luesak; Chatcharee Suchatlampong; ชัชรี สุชาติล้ําพงศ์; Somchai Urapepon; สมชาย อุรพีพล; Mahidol University. Faculty of Dentistry. Department of ProsthodonticsObjective: The purpose of this study was to determine the effect of cement thickness on the shear bond strength of two commercial adhesive resin cements, Panavia-F and Super-Bond C&B when used to bond nickel-chromium alloy to bovine dentine.... Materials and methods: Ni-Cr alloy discs, Ø5x3 mm and bovine teeth (120 pairs) were bonded together by two different resin cements (Super Bond C&B and Panavia F) at four different film thicknesses (50, 100, 150 and 200 micrometers). After bondingPublication 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 Open Access Effect of HTPB-TAC primer on the bond strength of a resin cement to zirconia.(2558-08) Somchai Urapepon; สมชาย อุรพีพล; Choltacha Harnirattisai; ชลธชา ห้านิรัติศัย; Thanit Soonpan; Mahidol University. Faculty of Dentistry. Department of Prosthodontics; Mahidol University. Faculty of Dentistry. Department of Operative Dentistry and Endodonticsand methods: Fully sintered zirconia blocks were primed with either HTPB-TAC primer or Alloy primer® then bonded to resin composite block using a resin cement. The blocks bonded with resin cement without primer served as a negative control. Each cemented... strength of HTPB-TAC primer and Alloy primer showed significantly higher bond strength compared to the non-primed specimen (p<0.05) while those of HTPB-TAC primer had no statistical difference from Alloy primer (p>0.05). The bond strength of all primersPublication Open Access Surface hardness of Thai spherical amalgam product.(2015-01) Pornkiat Churnjitapirom; พรเกียรติ ชื่นจิตอภิรมย์; Chayada Teanchai; ชญาดา เทียนไชย; Anucha Sacharoen; อนุชา ซาเจริญ; Anucha Sacharoen; อนุชา ซาเจริญ; Mahidol University. Faculty of Dentistry. Research OfficeObjective: The purpose of this study was to compare the surface hardness of Thai spherical amalgam product (N’SURE) with three commercial spherical amalgams (Tytin FC®, Amalcap® Plus, and GS-80 spherical). Materials and methods: Ten specimens were prepared from each of four spherical amalgams and then stored at 37°C for 24 hours. The surface of each specimen was polished using SiC paper (P240 to P4,000) and finished using alumina particles (average particle size, 0.05 µm). Surface hardness was then measured using Vickers hardness test under 1 kgf load for 15 seconds. The data were statistically analyzed using One-way ANOVA and Tukey’s multiple comparison test at 95% confidence interval. Results: The surface hardness of all spherical amalgams ranged from 127.77 to 158.51 HV1. Significant differences in surface hardness were found among all spherical amalgams. The highest was GS-80 spherical followed by Tytin FC®, Thai amalgam, and the lowest was Amalcap® Plus. Conclusion: The result of this study showed that surface hardness of Thai spherical amalgam product is comparable to commercially available spherical amalgams.Publication 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 Open Access Effect of noble metal primers on the microtensile bond strength of resin cements to zirconia(2011-05) Somchai Urapepon; สมชาย อุรพีพล; Kamala Wootthisarnwatthana; กมลา วุฒิสารวัฒนา; Somchai Urapepon; สมชาย อุรพีพล; Mahidol University. Faculty of Dentistry. Department of Prosthodontics, and their surfaces were sandblasted with 250 and 50 μm aluminum oxide particles. Specimens were divided into six groups, which were treated and bonded in combination with two noble primers (Alloy primer® and Metaltite®) and two resin cements (Panavia F and RelyX U... metal primers did not show any effect on the bond to zirconia. However, MDP, containing in Panavia F and Alloy primer, was found to influence the bond to zirconia. The durability of the bond to zirconia was unstable under thermocycling. Significance
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