Postgraduate student, Division of Fixed Prosthodontics and Biomaterials, Center of Dental Medicine, University of Geneva, Geneva, Switzerland.
Private practice, Gällivare, Sweden.
J Prosthet Dent. 2018 May;119(5):833-839. doi: 10.1016/j.prosdent.2017.07.006. Epub 2017 Sep 28.
Saliva contamination has been shown to decrease bonding to zirconia. Adopting a less contamination-sensitive cement system may be an alternative to decontamination.
The purpose of this in vitro study was to assess the ability of different primer/cement systems to promote a durable bond to zirconia after saliva contamination.
Zirconia blocks (Lava Plus) (N=320) were airborne-particle abraded (50 μm AlO) and divided into 32 experimental groups (n=10) according to the variables in the study: saliva contamination; primer/cement system (Panavia SA [PSA]; RelyX Unicem 2 [RU2]; Bifix SE [BSE]; Panavia F2.0 [PF2]; Scotchbond Universal + RelyX Ultimate [SBU+RXU]; Futurabond M+ + Bifix QM [FBM+BQM]; All-Bond Universal + Duo-link [ABU+DL]; Z-Prime Plus + Duo-link [ZPP+DL]; and aging period (72 hours; 30 days with 10 000 thermocycles at 5°C to 55°C). After half of the blocks had been contaminated with fresh human saliva for 10 minutes, rinsed with water, and air-dried, each primer/cement was applied. Polymerized composite resin disks were then placed over the cement, and the resin cement was light-polymerized for 20 seconds each at 2 opposite margins. After the aging time, the specimens were tested in shear (1 mm/min). The failure mode was classified as adhesive, cohesive, or mixed. Statistical analysis of the shear bond strength (SBS) data was performed with ANOVA followed by Tukey honest significant difference post hoc tests. Chi-square tests were used to analyze the failure mode data (α=.05).
The mean SBS ranged between 4.2 and 34.5 MPa. Shear bond strength was influenced (P<.001) by all the factors studied (cement system, saliva contamination, aging time). SBU+RXU and FBM+BQM showed a higher mean SBS than those of the other experimental groups (P<.05) and were the only groups not affected by saliva contamination (P>.05). Failure was predominantly classified as adhesive.
In general, saliva contamination and aging decreased bonding efficacy. Two systems, combining an application of a universal adhesive and a resin cement (SBU+RXU and FBM+BQM) were not affected by saliva contamination.
唾液污染已被证明会降低氧化锆的粘结性。采用污染敏感性较低的粘结系统可能是一种去污的替代方法。
本体外研究的目的是评估不同底涂/粘结系统在唾液污染后促进氧化锆持久粘结的能力。
将氧化锆块（Lava Plus）（N=320）进行气载颗粒喷砂处理（50μm AlO），并根据研究中的变量分为 32 个实验组（n=10）：唾液污染；底涂/粘结系统（Panavia SA [PSA]；RelyX Unicem 2 [RU2]；Bifix SE [BSE]；Panavia F2.0 [PF2]；Scotchbond Universal + RelyX Ultimate [SBU+RXU]；Futurabond M+ Bifix QM [FBM+BQM]；All-Bond Universal + Duo-link [ABU+DL]；Z-Prime Plus + Duo-link [ZPP+DL]）；老化时间（72 小时；30 天，在 5°C 至 55°C 下进行 10000 次热循环）。一半的氧化锆块用新鲜的人唾液污染 10 分钟后，用清水冲洗，风干，然后涂底涂/粘结剂。然后将复合树脂盘放在粘结剂上，用光在 2 个相对边缘各聚合 20 秒。老化时间后，将试样在剪切力下（1mm/min）进行测试。失效模式分为粘结、内聚和混合。采用方差分析（ANOVA）结合 Tukey 诚实显著差异事后检验对剪切粘结强度（SBS）数据进行统计分析。采用卡方检验分析失效模式数据（α=.05）。
平均 SBS 范围在 4.2 至 34.5 MPa 之间。SBS 受到所有研究因素（粘结系统、唾液污染、老化时间）的影响（P<.001）。SBU+RXU 和 FBM+BQM 的平均 SBS 高于其他实验组（P<.05），且不受唾液污染的影响（P>.05）。失效主要分类为粘结。
总的来说，唾液污染和老化会降低粘结效果。两种系统，结合使用通用粘结剂和树脂粘结剂（SBU+RXU 和 FBM+BQM），不受唾液污染的影响。
