Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
Faculty of Mechanical Engineering, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
Eur J Oral Sci. 2023 Aug;131(4):e12938. doi: 10.1111/eos.12938. Epub 2023 Jun 1.
This study aimed to compare the effect of sodium hypochlorite (NaOCl) and calcium hypochlorite [Ca(OCl) ] on the bond strength to pulp chamber dentin when followed or not by the use of sodium thiosulfate (Na S O ). The pulp chamber of fifty human molars were divided into five groups (n = 10) according to the immersion protocol: 2.5% NaOCl; 2.5% NaOCl + 5% Na S O ; 2.5% Ca(OCl) ; 2.5% Ca(OCl) + 5% Na S O ; and 0.9% sodium chloride (NaCl; control). Subsequently, the samples were restored with resin composite. Three sticks each were obtained and subjected to microtensile testing. SEM/EDS analyses of the pulp chamber roof (n = 8) were carried out for mineral quantification. Elemental analysis data were investigated via one-way ANOVA and Tukey's post hoc, and bond strength data by post hoc pairwise comparisons using the Kruskal-Wallis test. Use of 2.5% NaOCl was associated with the lowest value of bond strength, while 2.5% Ca(OCl) had similar bond strength to that of the 0.9% NaCl control. Using 5% Na S O was able to increase the bond strength after 2.5% NaOCl, but not after 2.5% Ca(OCl) . The group treated only with 2.5% Ca(OCl) had a higher Ca/P ratio on the dentin surface. Dentin treated with Ca(OCl) was not affected by Na S O and showed bond strength similar to the 0.9% NaCl.
本研究旨在比较次氯酸钠（NaOCl）和次氯酸钙[Ca（OCl）]对牙髓腔牙本质粘结强度的影响，同时观察使用硫代硫酸钠（NaS2O3）后的效果。根据浸泡方案，将五十个人类磨牙的牙髓腔分为五组（n=10）：2.5% NaOCl；2.5% NaOCl+5% NaS2O3；2.5% Ca（OCl）；2.5% Ca（OCl）+5% NaS2O3；0.9%氯化钠（NaCl；对照组）。随后，用树脂复合材料对样本进行修复。每个样本获得三个试件，并进行微拉伸试验。对牙髓腔顶（n=8）进行 SEM/EDS 分析以进行矿物质定量分析。通过单因素方差分析和 Tukey 事后检验分析元素分析数据，通过 Kruskal-Wallis 检验进行粘结强度数据的事后两两比较。使用 2.5% NaOCl 与最低的粘结强度相关，而 2.5% Ca（OCl）的粘结强度与 0.9% NaCl 对照组相似。使用 5% NaS2O3 可以提高 2.5% NaOCl 后的粘结强度，但不能提高 2.5% Ca（OCl）后的粘结强度。仅用 2.5% Ca（OCl）处理的组在牙本质表面具有更高的 Ca/P 比值。用 Ca（OCl）处理的牙本质不受 NaS2O3 的影响，其粘结强度与 0.9% NaCl 相似。
