Mohamed M F, El Deeb H A, Gomaa I E, Mobarak E H
Oper Dent. 2015 May-Jun;40(3):293-303. doi: 10.2341/14-035-L. Epub 2014 Nov 18.
To evaluate the durability of the bond of different resin cement systems to normal dentin (ND) and caries-affected dentin (CAD) with and without simulated intrapulpal pressure (IPP).
Molars with midcoronal caries were used. Occlusal enamel was cut to expose both dentin substrates (ND and CAD). Dentin substrates were differentiated using visual, tactile, caries-detecting dye, and dye-permeability methods. Prepared crown segments were equally divided according to the tested resin cement systems: etch-and-rinse resin cement, self-etch resin cement containing methacryloyloxydecyl dihydrogen phosphate (MDP), and self-adhesive resin cement. In addition to the dentin substrates and the resin cement types, the effect of application/storage conditions (with or without simulated IPP and with or without thermocycling) were tested. A microtensile bond strength test was done using a universal testing machine. Failure modes were determined using a scanning electron microscope.
Etch-and-rinse resin cement strength values were significantly affected by the difference in the dentin substrates as well as the different application/storage conditions. Self-etch adhesive containing MDP bonded equally to ND and CAD and remained stable under all tested conditions. Self-adhesive resin cement revealed a similar bond to ND and CAD; however, its values were the lowest, especially when IPP and thermocycling were combined. Mixed failure was the predominant failure mode.
Etch-and-rinse resin cement was sensitive to dentin substrate and application/storage conditions. Resin cement with self-etch adhesive containing MDP revealed more reliable bonding to ND/CAD even when IPP and thermocycling were combined. The bonding of the self-adhesive resin cement could not compete with other resin cements.
评估不同树脂水门汀系统在有或无模拟牙髓腔内压力（IPP）的情况下与正常牙本质（ND）和龋损牙本质（CAD）的粘结耐久性。
使用患有牙冠中部龋的磨牙。磨除咬合面釉质以暴露两种牙本质基质（ND和CAD）。通过视觉、触觉、龋损检测染料和染料渗透性方法区分牙本质基质。根据测试的树脂水门汀系统将制备好的牙冠段平均分为：酸蚀冲洗树脂水门汀、含甲基丙烯酰氧基癸基磷酸二氢酯（MDP）的自酸蚀树脂水门汀和自粘结树脂水门汀。除了牙本质基质和树脂水门汀类型外，还测试了应用/储存条件（有或无模拟IPP以及有或无热循环）的影响。使用万能试验机进行微拉伸粘结强度测试。使用扫描电子显微镜确定失效模式。
酸蚀冲洗树脂水门汀的强度值受牙本质基质差异以及不同应用/储存条件的显著影响。含MDP的自酸蚀粘结剂与ND和CAD的粘结效果相同，并且在所有测试条件下都保持稳定。自粘结树脂水门汀与ND和CAD的粘结情况相似；然而，其值最低，尤其是当IPP和热循环同时存在时。混合失效是主要的失效模式。
酸蚀冲洗树脂水门汀对牙本质基质和应用/储存条件敏感。含MDP的自酸蚀粘结剂的树脂水门汀即使在IPP和热循环同时存在时，对ND/CAD的粘结也更可靠。自粘结树脂水门汀的粘结效果无法与其他树脂水门汀竞争。
