Effect of heating palladium-silver alloys on ceramic bond strength

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• 作者：Jie-yin Li ; DDS^a ; Rui-nan Li ; DDS^b ; Shao-hai Chang ; DDS^c ; Pei-lin Zhuang ; DDS^d ; Juan-kun Liao ; DDS^e ; Xiu-hua Ye ; DDS^f ; Jian-tao Ye ; DDS ; MD^g ; ^{dutaoye@163.com" class="auth_mail" title="E-mail the corresponding author}
• 刊名：The Journal of Prosthetic Dentistry
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：114
• 期：5
• 页码：715-724
• 全文大小：4935 K

文摘

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 (伪=.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.