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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 Prosthodonticsthan that of the Cu-Al-Ni alloy. Conclusion: Regarding mechanical properties, Cu-Al alloy seemed the most suitable for post and core materials while Cu-Al-Ni alloy had the highest corrosion resistance. Thus, both Cu-Al and Cu-Al-Ni alloys showed... promising properties for further development as appropriate post-and-core materials.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... be considered for a potential use as dental post and core applications. © 2014 The Korean Academy of Prosthodontics.Publication Metadata only Development of fibre-reinforced composite disk for computer-aided design-computer-aided manufacturing milled posts; Experimental composite disk using e-glass fibre in different fibre direction(2021-10-01) Warin Prachasujit; Somchai Urapepon; Mahidol University, Faculty of Dentistryfibre-reinforced composite disk showed the potential to be used as a CAD-CAM disk for post and core fabrication....Aims: To evaluate the flexural properties of computer-aided design-computer-aided manufacturing (CAD-CAM) milled posts fabricated from the experimental fibre-reinforced composite disks in different fibre direction, and to compare the flexuralPublication Open Access Degree of conversion of resin composite cured by light through a translucent fiber posts.(2014-06) Somchai Urapepon; สมชาย อุรพีพล; Somchai Urapepon; สมชาย อุรพีพล; Mahidol University. Faculty of Dentistry. Department of ProsthodonticsPURPOSE: This study evaluated the depth of cure of resin composite cured by light through a translucent fiber post. MATERIALS AND METHODS: The opaque plastic tubes in various lengths of 2, 4, 6, 8, 10, 12, 14 mm. were filled with resin composite... in which two different translucent fiber posts were inserted into the center and photo-polymerized for 40 seconds. The degree of conversion of the cured composite at bottom surface were examined using Fourier transform infrared attenuated total reflectionPublication 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 EndodonticsObjective: The purpose of this study was to evaluate the effect of Hydroxyl-terminated polybutadiene grafting with Trimellitic anhydride chloride (HTPB-TAC) primer on microtensile bond strength of a resin cement to zirconia ceramics. Materials and 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 block was cut into 8 microbars (1x1mm). Pool of 48 microbars for each condition was prepared. Half of microbars in each condition were investigated with a microtensile bond strength test. The others were subjected to thermocycling for 10,000 cycles (5 to 55°C) before testing. Data were analyzed with two-way ANOVA and Games-Howell test at α = 0.05. Results: The microtensile bond strength values were significantly affected by primer and thermocycling without their interaction. The microtensile bond 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 primers including non-primer was drastically decreased after thermocycling. Conclusion: HTPB-TAC primer could promote the bond strength of resin cement to zirconia.