de Souza Grace, Hennig Diana, Aggarwal Anuj, Tam Laura E
Assistant Professor, Department of Clinical Sciences, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.
Graduate student, Institute of Chemical Technology of Materials Synthesis, Faculty of Chemistry and Pharmacy, University of Würzburg, Würzburg, Germany.
J Prosthet Dent. 2014 Oct;112(4):895-902. doi: 10.1016/j.prosdent.2014.01.016. Epub 2014 Apr 22.
A strong and stable bond between the luting resin and overlying ceramic restoration is critical to longevity, but no technique has been established for how to provide such a bond when the core material is zirconia.
The purpose of this study was to evaluate the effect of different materials containing 10-methacryloyloxydecyl dihydrogen phosphate (MDP) on the bond strength to yttria-tetragonal zirconia polycrystal (Y-TZP) ceramic.
Forty Y-TZP slices (Lava) were cemented to substrates (8 groups; n=5 in each) with or without the previous application of an experimental primer (0.5% MDP) or an MDP-based adhesive (Clearfil S3 Bond Plus or Scotchbond Universal) with either an MDP (Clearfil SA) or a non-MDP (RelyX Ultimate) luting resin. Specimens were cut, stored in distilled water, and microtensile tested (5 beams per specimen) at 48 hours and again at 6 months after luting procedures. The data were analyzed by 4-way ANOVA (α=.05) and the Tukey test (α=.05). The mode of failure was classified with a stereomicroscope, and the treated surfaces were analyzed with energy-dispersive x-ray spectroscopy.
Both adhesive (P<.001) and time (P<.001) significantly affected bond strength. The interaction of any of the factors was not significant. The use of an MDP-containing adhesive and the shorter storage time were associated with higher bond strengths. At 48 hours, an overall incidence of 50.5% of Type 1 mode of failure (adhesive at ceramic/resin interface) occurred, as opposed to 68% after 6 months of water storage. Energy-dispersive x-ray spectroscopy results showed peaks of carbon and phosphorus when MDP-based materials were used.
The application of an MDP-based adhesive may improve bond strength to zirconia. However, microtensile bond strength results for all groups did not remain stable over 6 months.
粘接树脂与上层陶瓷修复体之间牢固稳定的结合对于其长期使用寿命至关重要，但当核心材料为氧化锆时，尚未确立如何实现这种结合的技术。
本研究的目的是评估含10 - 甲基丙烯酰氧基癸基磷酸二氢酯（MDP）的不同材料对与氧化钇 - 四方氧化锆多晶体（Y - TZP）陶瓷的粘结强度的影响。
将40片Y - TZP切片（Lava）粘结到基底上（8组；每组n = 5），之前使用或不使用实验性底漆（0.5% MDP）或基于MDP的粘结剂（Clearfil S3 Bond Plus或Scotchbond Universal），并使用含MDP（Clearfil SA）或不含MDP（RelyX Ultimate）的粘结树脂。将标本切割后，储存在蒸馏水中，并在粘结操作后48小时和6个月时进行微拉伸测试（每个标本5根梁）。数据通过四因素方差分析（α = 0.05）和Tukey检验（α = 0.05）进行分析。用立体显微镜对失效模式进行分类，并用能量色散X射线光谱仪分析处理过的表面。
粘结剂（P < 0.001）和时间（P < 0.001）均对粘结强度有显著影响。任何因素之间的相互作用均不显著。使用含MDP的粘结剂和较短的储存时间与较高的粘结强度相关。在48小时时，1型失效模式（陶瓷/树脂界面处的粘结剂）的总体发生率为50.5%，而在储存6个月后为68%。能量色散X射线光谱仪结果显示，当使用基于MDP的材料时，出现碳和磷的峰值。
应用基于MDP的粘结剂可能会提高与氧化锆的粘结强度。然而，所有组的微拉伸粘结强度结果在6个月内并未保持稳定。
