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首页> 外文期刊>Journal of dentistry >Slow progression of dentin bond degradation during one-year water storage under simulated pulpal pressure.
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Slow progression of dentin bond degradation during one-year water storage under simulated pulpal pressure.

机译：在模拟牙髓压力下储存一年的水期间，牙本质键降解的进展缓慢。

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OBJECTIVES: To evaluate the dentin bond durability of simplified adhesives after one-year (1 y) under water storage and simulated pulpal pressure. METHODS: Class I cavities were prepared in sixty human third molars with the pulpal wall located in mid-coronal dentin. The roots were cut off to expose the pulpal chamber, and the teeth were assembled in a pulpal pressure simulator device. A two-step etch-and-rinse adhesive (Single Bond 2/SB), a two-step self-etch adhesive (Clearfil SE Bond/CSE), a three-step self-etch adhesive (Adper Scotchbond SE/SSE) and three all-in-one adhesives (Adper Easy Bond/EB, Clearfil S(3) Bond/S3 and Adhese One/AO) were applied according to manufacturers instructions. No enamel pre-etching was used for the self-etch systems. The cavities were filled with a composite (Z250, 3M ESPE) in four to five horizontal increments and individually cured. Immediately after the final cure, pulpal pressure was set to 15 cm H(2)O. After 24 h and 1 y under simulate pulpal pressure the teeth were cut following a 'nontrimming' microtensile test technique (n=30) and tested in tension. Kruskall-Wallis and post hoc multiple comparisons were used at alpha=0.05. Weibull statistics was applied to SB, CSE and EB. Fractographic analysis of debonded specimens was performed using scanning electron microscopy. RESULTS: At 24 h and 1 y periods, SB showed higher bond strength means than all the others adhesives tested. CSE was not statistically different from EB at 24 h and from EB and SB at 1 y. EB showed bond strength statistically higher than the other three self-etch adhesives, which were not statistically different from each other at 24 h. AO showed significantly lower bond strength than all tested materials after 1 y. For all adhesives the mean bond strength at 1 y were not statistically different from the values measured at 24 h (p>0.05). Shifts in failure mode patterns and Weibull modulus decrease indicate some degree of bond degradation after the 1 y storage period. CONCLUSION: One-year of simulated pulpal pressure did not affect dentin bond strength of simplified adhesives in Class I restorations. Signs of degradation were only revealed by fractographic analysis and reliability parameters.
机译：目的：评估在水储存和模拟牙髓压力下一年（1年）后简化粘合剂的牙本质粘合耐久性。方法：在六十个人的第三磨牙中制备I类腔，其牙髓壁位于冠状牙中间。切掉牙根，露出牙髓腔，然后在牙髓压力模拟器装置中组装牙齿。两步蚀刻和冲洗粘合剂（Single Bond 2 / SB），两步自蚀刻粘合剂（Clearfil SE Bond / CSE），三步自蚀刻粘合剂（Adper Scotchbond SE / SSE）和根据制造商的说明使用了三种多合一的粘合剂（Adper Easy Bond / EB，Clearfil S（3）Bond / S3和Adhese One / AO）。自蚀刻系统未使用搪瓷预蚀刻。用四到五个水平增量的复合材料（Z250、3M ESPE）填充型腔，并分别固化。最终固化后，立即将纸浆压力设置为15 cm H（2）O。在模拟牙髓压力下放置24小时和1年后，按照“非修整”微拉伸试验技术（n = 30）切割牙齿，并进行张力测试。 Kruskall-Wallis和事后多重比较用于alpha = 0.05。威布尔统计应用于SB，CSE和EB。使用扫描电子显微镜对脱粘的样品进行分形分析。结果：在24 h和1 y周期内，SB的粘合强度均值高于所有其他测试的粘合剂。 CSE在24小时时与EB以及在1年时与EB和SB的差异无统计学意义。 EB的粘合强度在统计学上高于其他三种自蚀刻胶粘剂，后者在24 h时在统计学上没有差异。 1年后，AO显示出比所有测试材料低得多的粘结强度。对于所有粘合剂，在1 y时的平均粘合强度与在24 h时测得的值无统计学差异（p> 0.05）。失效模式模式的变化和威布尔模量的降低表明在1年储存期后某种程度的键降解。结论：一年的模拟牙髓压力并未影响I类修复物中简化粘合剂的牙本质粘合强度。降解的迹象只能通过分形分析和可靠性参数来揭示。

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