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Effect of heating palladium-silver alloys on ceramic bond strength.
Li, Jie-yin; Li, Rui-nan; Chang, Shao-hai; Zhuang, Pei-lin; Liao, Juan-kun; Ye, Xiu-hua; Ye, Jian-tao.
Afiliación
  • Li JY; Resident, Department of Prosthodontics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China; and Resident, Department of Stomatology, Jieyang People's Hospital, Jieyang, China.
  • Li RN; Technical Director, Dingyuan Dental Lab Ltd, Dongguan, China.
  • Chang SH; Assistant Professor, Department of Prosthodontics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
  • Zhuang PL; Resident, Department of Prosthodontics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
  • Liao JK; Resident, Department of Prosthodontics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
  • Ye XH; Resident, Department of Prosthodontics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
  • Ye JT; Assistant Professor, Department of Prosthodontics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China. Electronic address: dutaoye@163.com.
J Prosthet Dent ; 114(5): 715-24, 2015 Nov.
Article en En | MEDLINE | ID: mdl-26213266
STATEMENT OF PROBLEM: The effects of different heat treatments on the internal oxidation and metal-ceramic bond in Pd-Ag alloys with different trace elements require further documentation. PURPOSE: The purpose of this in vitro study was to determine whether heat treatment affects the metal-ceramic bond strength of 2 Pd-Ag alloys containing different trace elements. MATERIAL AND METHODS: Thirteen cast specimens (25×3×0.5 mm) from each of 2 Pd-Ag alloy groups (W-1 and Argelite 61+3) were allocated to heat treatments before porcelain application: heating under reduced atmospheric pressure of 0.0014 MPa and 0.0026 MPa and heating under normal atmospheric pressure. Bond strengths were evaluated using a 3-point bending test according to ISO9693. Results were analyzed using 2-way ANOVA and Tukey HSD test (α=.05). Visual observation was used to determine the failure types of the fractured specimens. Scanning electron microscopy and energy dispersive spectroscopy were used to study morphologies, elemental compositions, and distributions in the specimens. RESULTS: The W-1 group had a mean bond strength significantly higher than that of Argelite 61+3 (P<.001). Heating under reduced atmospheric pressures of 0.0014 MPa and 0.0026 MPa resulted in similar bond strengths (P=.331), and both pressures had significantly higher bond strengths than that of heating under normal atmospheric pressure (P=.002, P<.001). Heating under different air pressures resulted in Pd-Ag alloys that contained either Sn or In and Ga, with various degrees of internal oxidation and different quantities of metallic nodules. CONCLUSIONS: Heating under reduced atmospheric pressure effectively improved the bond strength of the ceramic-to-Pd-Ag alloys.
Asunto(s)

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Paladio / Plata / Aleaciones de Cerámica y Metal / Resistencia al Corte / Materiales Dentales / Calor Idioma: En Revista: J Prosthet Dent Año: 2015 Tipo del documento: Article

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Paladio / Plata / Aleaciones de Cerámica y Metal / Resistencia al Corte / Materiales Dentales / Calor Idioma: En Revista: J Prosthet Dent Año: 2015 Tipo del documento: Article