背景:密封剂对牙本质的粘合强度受各种因素的影响,涂抹层的存在是关键变量之一。壳聚糖,以其牙本质相容性而闻名,先前已证明,当用作冲洗液和最终冲洗液时,与乙二胺四乙酸(EDTA)相当,牙本质变化和树脂密封剂粘合强度降低。这项研究调查了壳聚糖的影响,用作润滑凝胶和最终冲洗,树脂密封胶的推出粘结强度。
方法:40颗单根前磨牙,每个都有一个完全形成的根和一个根管,在提取后收集。在运河准备期间,每次更换仪器时,使用1ml次氯酸钠(3%)进行灌溉,然后对每个实验组应用特定的螯合凝胶和最后的冲洗。这些组包括:第1组(17%EDTA螯合凝胶,最后用盐水冲洗),第2组(17%EDTA螯合凝胶,最后用17%EDTA溶液冲洗),第3组(壳聚糖螯合凝胶,最后用盐溶液冲洗),和第4组(壳聚糖螯合凝胶,最终用0.2%壳聚糖溶液冲洗),每组10个标本。闭塞后,将样品密封并在37°C和100%湿度下孵育一周。万能试验机用于推出测试,使用扫描电子显微镜(SEM)检查样品以识别各种类型的粘结破坏。
结果:在四组中,第2组表现出最高的平均推出粘结强度(7.33±0.26MPa),其次是第4组(5.33±0.25MPa),第1组(4.61±0.30MPa),和第3组(2.94±0.32MPa)。粘合强度的变化表明螯合剂和最终冲洗溶液对树脂密封剂与牙本质的相互作用有显著影响。
结论:该研究得出的结论是,使用EDTA作为润滑凝胶和最终冲洗液可以显着增强挤出粘合强度,在这项研究中表现优于壳聚糖。以盐水作为最终冲洗液的组(第1组和第3组)表现出最小的结合强度,强调最终冲洗在根管治疗中的重要性。
BACKGROUND: The adhesive strength of sealers to dentin is influenced by various factors, and the presence of a smear layer is among the critical variables. Chitosan, known for its dentin compatibility, has previously demonstrated a reduction in dentin change and resin sealer bond strength comparable to ethylenediaminetetraacetic acid (
EDTA) when used as an irrigant and final rinse. The study investigates the impact of chitosan, used as both a lubricating gel and final rinse, on the push-out bond strength of resin sealer.
METHODS: Forty single-rooted premolar teeth, each with a fully formed root and a single root canal, were collected post-extraction. During canal preparation, 1 ml sodium hypochlorite (3%) was used for irrigation at every change of instrument, followed by applying specific chelating gel and final rinse for each experimental group. The groups included: Group 1 (17%
EDTA chelating gel, final rinse with saline), Group 2 (17%
EDTA chelating gel, final rinse with 17%
EDTA solution), Group 3 (chitosan chelating gel, final rinse with saline solution), and Group 4 (chitosan chelating gel, final rinse with 0.2% chitosan solution), 10 specimens in each group. After obturation, specimens were sealed and incubated for a week at 37°C with 100% humidity. The universal testing machine was used for push-out tests, and specimens were examined using a scanning electron microscope (SEM) to identify various types of bond failure.
RESULTS: Among the four groups, Group 2 exhibited the highest mean push-out bond strength (7.33 ± 0.26 MPa), followed by Group 4 (5.33 ± 0.25 MPa), Group 1 (4.61 ± 0.30 MPa), and Group 3 (2.94 ± 0.32 MPa). The variations in bond strength suggest a notable impact of the chelating agents and final rinse solutions on the resin sealer\'s interaction with dentin.
CONCLUSIONS: The study concludes that the use of
EDTA as both a lubricating gel and a final rinse significantly enhances push-out bond strength, outperforming chitosan in this study. Groups with saline as the final rinse (Group 1 and Group 3) exhibited the least bond strength, highlighting the importance of the final rinse in root canal therapy.