Dalby Robert, Ellakwa Ayman, Millar Brian, Martin F Elizabeth
Faculty of Dentistry, The University of Sydney, NSW 2006, Australia.
Int J Dent. 2012;2012:310702. doi: 10.1155/2012/310702. Epub 2012 Jan 12.
Objectives. To examine the effect of immediate dentin sealing (IDS), with dentin bonding agents (DBAs) applied to freshly cut dentin, on the shear bond strength of etched pressed ceramic luted to dentin with RelyX Unicem (RXU) cement. Method. Eighty extracted noncarious third molars were ground flat to expose the occlusal dentin surfaces. The teeth were randomly allocated to five groups (A to E) of sixteen teeth each. Groups A to D were allocated a dentin bonding agent (Optibond FL, One Coat Bond, Single Bond, or Go!) that was applied to the dentin surface to mimic the clinical procedure of IDS. These specimen groups then had etched glass ceramic discs (Authentic) luted to the sealed dentin surface using RXU. Group E (control) had etched glass ceramic discs luted to the dentin surface (without a dentin bonding agent) using RXU following the manufacturer's instructions. All specimens were stored for one week in distilled water at room temperature and then shear stressed at a constant cross-head speed of 1 mm per minute until failure. Statistical analysis was performed by ANOVA followed by post hoc Tukey HSD method (P < 0.05) applied for multiple paired comparisons. Results. The shear bond strength results for group A to E ranged from 6.94 ± 1.53 to 10.03 ± 3.50 MPa. One-way ANOVA demonstrated a difference (P < 0.05) between the groups tested and the Tukey HSD demonstrated a significant (P < 0.05) difference between the shear bond strength (SBS) of Optibond FL (Group A) and Go! (Group D). There was no statistical difference (P > 0.05) in the SBS between the test groups (A-D) or the control (group E). Conclusion. IDS using the dentin bonding agents tested does not statistically (P > 0.05) affect the shear bond strength of etched pressed ceramic luted to dentin with RXU when compared to the control.
目的。研究使用牙本质粘结剂（DBA）对新鲜切割的牙本质进行即时牙本质封闭（IDS），对用RelyX Unicem（RXU）粘结剂粘结到牙本质上的酸蚀压制陶瓷的抗剪粘结强度的影响。方法。将80颗拔除的无龋第三磨牙磨平，以暴露咬合面牙本质表面。牙齿被随机分为五组（A至E），每组16颗牙齿。A至D组被分配一种牙本质粘结剂（Optibond FL、One Coat Bond、Single Bond或Go!），将其应用于牙本质表面以模拟IDS的临床操作。然后使用RXU将这些样本组的酸蚀玻璃陶瓷盘（Authentic）粘结到封闭的牙本质表面。E组（对照组）按照制造商的说明，使用RXU将酸蚀玻璃陶瓷盘粘结到牙本质表面（不使用牙本质粘结剂）。所有样本在室温下的蒸馏水中储存一周，然后以每分钟1毫米的恒定十字头速度进行剪切应力测试，直至破坏。采用方差分析（ANOVA）进行统计分析，随后应用事后Tukey HSD方法（P < 0.05）进行多组配对比较。结果。A至E组的抗剪粘结强度结果范围为6.94±1.53至10.03±3.50兆帕。单因素方差分析表明测试组之间存在差异（P < 0.05），Tukey HSD检验表明Optibond FL组（A组）和Go!组（D组）的抗剪粘结强度（SBS）之间存在显著差异（P < 0.05）。测试组（A - D）与对照组（E组）之间的SBS无统计学差异（P > 0.05）。结论。与对照组相比，使用测试的牙本质粘结剂进行IDS对用RXU粘结到牙本质上的酸蚀压制陶瓷的抗剪粘结强度没有统计学影响（P > 0.05）。
