Resin-dentin interfacial ultrastructure and microtensile dentin bond strength after five-year water storage.
Resin-dentin interfacial ultrastructure and microtensile dentin bond strength after five-year water storage.
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DOI：
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发表时间：
2004-11
影响因子：
2.2
通讯作者：
S. Armstrong;M. Vargas;I. Chung;D. Pashley;J. Campbell;J. Laffoon;F. Qian
中科院分区：
文献类型：
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作者：
S. Armstrong;M. Vargas;I. Chung;D. Pashley;J. Campbell;J. Laffoon;F. Qian
目的评价全酸蚀三步粘接系统在水中放置多年后树脂-牙本质界面的超微结构和牙本质微拉伸粘接强度。方法采用全酸蚀三步粘接系统（Optibond FL，Kerr）和混合树脂复合材料（Prodigy，Kerr），在600目SiC扁平离体磨牙上制作树脂复合冠。制造microTBS试样，并将其置于37 ℃下含有0.5%氯胺T的水中，直至在1个月、6个月和5年储存时进行相应的静态载荷失效测试。通过扫描电子显微镜确定失效模式。透射电子显微镜（TEM）分析储存48小时和44个月后树脂-牙本质界面的超微结构。用威布尔分布对microTBS进行建模以进行存活分析，并且通过Wald卡方统计分析失效曲线分布以获得α =0.05处的显著差异。结果1个月、6个月和5年的特征拉伸强度分别为52.63、14.77和23.57 Mpa，Weibull模量分别为3.04、1.56和1.28。所有组的失败分布有显著差异（p 5年> 6个月）。TEM界面形态表明，在44个月的储存混合层组件的水解降解。意义拉伸强度的降低和超微结构的改变可能是由于水的吸附和由此产生的粘接接头的水解降解。
OBJECTIVE To evaluate a total-etch three-step adhesive system's resin-dentin interfacial ultrastructure and microtensile dentin bond strength (microTBS) after multi-year storage in water. METHODS Resin composite crowns were formed on 600 grit SiC flattened extracted human molars using a total-etch three-step adhesive system (Optibond FL, Kerr) and a hybrid resin composite (Prodigy, Kerr). microTBS specimens were fabricated and placed in water with 0.5% chloramine T at 37 degrees C until respective static load to failure testing at one-month, six-months and five-year storage. Failure modes were determined by scanning electron microscopy. The interfacial ultrastructure of the resin-dentin interface was analyzed by transmission electron microscopy (TEM) at 48-hours and 44-months storage. microTBS was modeled with Weibull distribution for survival analysis and failure curve distributions were analyzed by the Wald chi-square statistic for significant differences at alpha=0.05. RESULTS The characteristic tensile strength (sigma omicron) at one-month, six-months and five-year storage was 52.63, 14.77 and 23.57 Mpa, with a Weibull modulus of 3.04, 1.56 and 1.28, respectively. Failure distributions for all groups were significantly different (p five-year > six-months. TEM interfacial morphology demonstrated hydrolytic degradation of hybrid layer components at 44-months storage. SIGNIFICANCE The decrease in tensile strength and changes in ultrastructure may be caused by water sorption and resultant hydrolytic degradation of the adhesive joint.