Khmaj Mofida R, Khmaj Abdulfatah B, Brantley William A, Johnston William M, Dasgupta Tridib
Former graduate student, Division of Restorative, Prosthetic and Primary Care Dentistry, College of Dentistry, The Ohio State University, Columbus, Ohio.
Professor, Division of Restorative, Prosthetic and Primary Care Dentistry, and Director, Graduate Program in Dental Materials Science, College of Dentistry, The Ohio State University, Columbus, Ohio.
J Prosthet Dent. 2014 Nov;112(5):1194-200. doi: 10.1016/j.prosdent.2014.06.004. Epub 2014 Aug 16.
New noble alloys for metal ceramic restorations introduced by manufacturers are generally lower-cost alternatives to traditional higher-gold alloys. Information about the metal-to-ceramic bond strength for these alloys, which is needed for rational clinical selection, is often lacking.
The purpose of this study was to evaluate the bond strength of 4 recently introduced noble alloys by using 2 techniques for porcelain application.
Aquarius Hard (high-gold: 86.1 gold, 8.5 platinum, 2.6 palladium, 1.4 indium; values in wt. %), Evolution Lite (reduced-gold: 40.3 gold, 39.3 palladium, 9.3 indium, 9.2 silver, 1.8 gallium), Callisto 75 Pd (palladium-silver containing gold: 75.2 palladium, 7.1 silver, 2.5 gold, 9.3 tin, 1.0 indium), and Aries, (conventional palladium-silver: 63.7 palladium, 26.0 silver, 7.0 tin, 1.8 gallium, 1.5 indium) were selected for bonding to leucite-containing veneering porcelains. Ten metal ceramic specimens that met dimensional requirements for International Organization for Standardization (ISO) Standard 9693 were prepared for each alloy by using conventional porcelain layering and press-on-metal methods. The 3-point bending test in ISO Standard 9693 was used to determine bond strength. Values were compared with 2-way ANOVA (maximum likelihood analysis, SAS Mixed Procedure) and the Tukey test (α=.05).
Means (standard deviations) for bond strength with conventional porcelain layering were as follows: Aquarius Hard (50.7 ±5.5 MPa), Evolution Lite (40.2 ±3.3 MPa), Callisto 75 Pd (37.2 ±3.9 MPa), and Aries (34.0 ±4.9 MPa). For the press-on-metal technique, bond strength results were as follows: Aquarius Hard (33.7 ±11.5 MPa), Evolution Lite (34.9 ±4.5 MPa), Callisto 75 Pd (37.2 ±11.9 MPa), and Aries (30.7 ±10.8 MPa). From statistical analyses, the following 3 significant differences were found for metal-to-ceramic bond strength: the bond strength for Aquarius Hard was significantly higher for conventional porcelain layers compared with the press-on-metal technique; the bond strength for Aquarius Hard with conventional porcelain layers was significantly higher than the bond strengths for the other 3 alloys with conventional porcelain layers; and the bond strength for Aquarius Hard with conventional porcelain layers was significantly higher than the bond strength for Callisto 75 Pd with conventional porcelain layers and the other 3 alloys with the press-on-metal technique.
For both conventional layering and press-on-metal techniques, all 4 noble alloys had a mean metal-to-ceramic bond strength that substantially exceeded the 25 MPa minimum in the ISO Standard 9693. The results for Aries support the manufacturer's recommendation not to use the press-on-metal technique for alloys that contain more than 10% silver.
制造商推出的用于金属烤瓷修复体的新型贵金属合金通常是传统高金合金成本更低的替代品。合理的临床选择需要有关这些合金的金属与陶瓷结合强度的信息，但这类信息常常缺失。
本研究的目的是通过使用两种瓷应用技术来评估4种最近推出的贵金属合金的结合强度。
选择水瓶座硬质合金（高金：86.1%金、8.5%铂、2.6%钯、1.4%铟；重量百分比）、进化轻质合金（低金：40.3%金、39.3%钯、9.3%铟、9.2%银、1.8%镓）、卡利斯托75钯合金（含金银钯合金：75.2%钯、7.1%银、2.5%金、9.3%锡、1.0%铟）和白羊座合金（传统钯银合金：63.7%钯、26.0%银、7.0%锡、1.8%镓、1.5%铟）与含白榴石的饰面瓷进行结合。每种合金通过传统瓷层堆积法和金属压铸法制备10个符合国际标准化组织（ISO）9693标准尺寸要求的金属烤瓷试件。采用ISO 9693标准中的三点弯曲试验来测定结合强度。采用双向方差分析（最大似然分析，SAS混合程序）和Tukey检验（α = 0.05）对数值进行比较。
传统瓷层堆积法的结合强度均值（标准差）如下：水瓶座硬质合金（50.7±5.5兆帕）、进化轻质合金（40.2±3.3兆帕）、卡利斯托75钯合金（37.2±3.9兆帕）和白羊座合金（34.0±4.9兆帕）。对于金属压铸法，结合强度结果如下：水瓶座硬质合金（3
