Santana V B, de Alexandre R S, Rodrigues J A, Ely C, Reis A F
Oper Dent. 2016 Mar-Apr;41(2):189-99. doi: 10.2341/15-150-L. Epub 2015 Oct 8.
The object of this study was to evaluate the simulated pulpal pressure (SPP) and immediate dentin sealing technique (IDS) effects on the microtensile bond strength (μTBS) and nanoleakage of interfaces produced by different luting agents.
Two self-adhesive luting agents (RelyX Unicem [UC] and Clearfil SA Luting [SA]) and two conventional luting agents (Rely X ARC [RX] and Panavia F [PF]) were evaluated. Eighty human molars were divided in four groups according to luting agents. Each group was subdivided according to SPP (with or without) and dentin sealing (immediate or delayed) using Clearfil SE Bond (n=5). After IDS was performed, specimens were stored in water for seven days before luting procedures. Composite blocks were luted according to the manufacturers' instructions. One half of the specimens were subjected to 15 cm H2O of hydrostatic pressure for 24 hours before cementation procedures and continued for 24 hours afterward. Then, restored teeth were sectioned into beams and tested in tension. Two additional teeth per group were prepared for nanoleakage evaluation with scanning electron microscopy. Bond strength data were statistically analyzed by three-way analysis of variance and Tukey test.
μTBS of RX decreased when it was subjected to SPP without IDS. However, in the same conditions, μTBS of UC increased. The IDS prevented negative influence of SPP on μTBS of RX and PF; however, a decrease in μTBS of SA and UC was observed. Except for RX, IDS increased μTBS for all resin cements.
Independent of SPP, the IDS technique obtained higher μTBS for PF, SA, and UC and did not influence RX μTBS.
本研究的目的是评估模拟牙髓压力（SPP）和即时牙本质封闭技术（IDS）对不同粘结剂产生的界面微拉伸粘结强度（μTBS）和纳米渗漏的影响。
评估了两种自粘结粘结剂（RelyX Unicem [UC]和Clearfil SA Luting [SA]）和两种传统粘结剂（Rely X ARC [RX]和Panavia F [PF]）。80颗人类磨牙根据粘结剂分为四组。每组根据SPP（有或无）和使用Clearfil SE Bond进行的牙本质封闭（即时或延迟）进一步细分（n = 5）。进行IDS后，在粘结程序前将标本在水中储存7天。根据制造商的说明粘结复合块。一半标本在粘结程序前经受15 cm H2O的静水压力24小时，并在之后持续24小时。然后，将修复后的牙齿切成梁并进行拉伸测试。每组另外制备两颗牙齿用于扫描电子显微镜下的纳米渗漏评估。粘结强度数据通过三因素方差分析和Tukey检验进行统计分析。
当RX在没有IDS的情况下经受SPP时，其μTBS降低。然而，在相同条件下，UC的μTBS增加。IDS防止了SPP对RX和PF的μTBS的负面影响；然而，观察到SA和UC的μTBS有所下降。除RX外，IDS增加了所有树脂粘结剂的μTBS。
与SPP无关，IDS技术使PF、SA和UC获得了更高的μTBS，并且不影响RX的μTBS。
