Rai Shalini, Nikhil Vineeta, Jha Padmanabh
Department of Conservative Dentistry and Endodontics, Subharti Dental College and Hospital, Swami Vivekanand Subharti University, Meerut, Uttar Pradesh, India.
J Conserv Dent. 2021 Jul-Aug;24(4):354-358. doi: 10.4103/jcd.jcd_60_21. Epub 2022 Jan 13.
The objective of the study is to evaluate the effect of eugenol-based temporary on microtensile bond strength of self-adhering composite at 1 day and 7-day time intervals.
Occlusal enamel of 24 human molars was removed. Zinc oxide eugenol (ZnOE) and noneugenol temporary cement (ZnONE) were placed on the dentin surfaces and left for different times (1 day, 7 days). After removal of temporary cement, teeth were randomly divided into eight subgroups: subgroup GE1S ( = 3): ZnOE cement + Self-adhering composite (SAC), subgroup GE1N ( = 3): ZnOE cement + adhesive system (one coat 7 universal) + nanohybrid composite, subgroup GE7S ( = 3): ZnOE cement + SAC, subgroup GE7N ( = 3): ZnOE cement + adhesive system + nanohybrid composite, subgroup GNE1S ( = 3): ZnONE cement + SAC, subgroup GNE1N ( = 3): ZnONE cement + adhesive system + nanohybrid composite, subgroup GNE7S ( = 3): ZnONE cement + SAC, subgroup GNE7N ( = 3): ZnONE cement + adhesive system + nanohybrid composite. Four sticks per tooth were obtained, resulting in 12 sticks per group with a cross-sectional area of 0.5 mm . The μTBS test was performed with a crosshead speed of 0.5 mm/min.
Kruskal-Wallis and Mann-Whitney U-test were used for analysis.
Highest and lowest mean value of microtensile bond strength was observed in GNE7N (12.75MPa) and GE1S (1.42MPa), respectively.
The presence of eugenol at early stage, i.e. 1 day, has a negative influence on microtensile bond strength of SAC. At 7 days, the negative effect of eugenol on microtensile bond strength gets nullified. Thus, a waiting period of 1 week is sufficient to overcome negative influence of eugenol-based temporaries on polymerization of SAC.
本研究的目的是评估丁香酚基临时材料在1天和7天时间间隔对自粘结复合材料微拉伸粘结强度的影响。
去除24颗人磨牙的咬合面釉质。将氧化锌丁香酚（ZnOE）和非丁香酚临时粘结剂（ZnONE）置于牙本质表面，并放置不同时间（1天、7天）。去除临时粘结剂后，将牙齿随机分为八个亚组：亚组GE1S（n = 3）：ZnOE粘结剂+自粘结复合材料（SAC），亚组GE1N（n = 3）：ZnOE粘结剂+粘结系统（一层通用型7）+纳米混合复合材料，亚组GE7S（n = 3）：ZnOE粘结剂+SAC，亚组GE7N（n = 3）：ZnOE粘结剂+粘结系统+纳米混合复合材料，亚组GNE1S（n = 3）：ZnONE粘结剂+SAC，亚组GNE1N（n = 3）：ZnONE粘结剂+粘结系统+纳米混合复合材料，亚组GNE7S（n = 3）：ZnONE粘结剂+SAC，亚组GNE7N（n = 3）：ZnONE粘结剂+粘结系统+纳米混合复合材料。每颗牙齿获取4根粘结棒，每组共12根，横截面积为0.5平方毫米。微拉伸粘结强度（μTBS）测试的十字头速度为0.5毫米/分钟。
采用Kruskal-Wallis检验和Mann-Whitney U检验进行分析。
微拉伸粘结强度的最高和最低平均值分别出现在GNE7N组（12.75MPa）和GE1S组（1.42MPa）。
早期（即1天）丁香酚的存在对SAC的微拉伸粘结强度有负面影响。在7天时，丁香酚对微拉伸粘结强度的负面影响消失。因此，1周的等待期足以克服丁香酚基临时材料对SAC聚合的负面影响。
