Department of Endodontics, Faculty of Dentistry, Near East University, Near East Boulevard, Mersin 10, Turkey.
Department of Medical Biochemistry, Faculty of Medicine, Near East University, Mersin 10, Turkey.
BMC Oral Health. 2022 Jun 30;22(1):266. doi: 10.1186/s12903-022-02300-4.
The present study aimed to make a comparison between the effects of 35% hydrogen peroxide gel (HP) and sodium perborate with distilled water (SP) bleaching agents on the sealing characteristics of glass ionomer cement (GIC), TheraBase, ProRoot MTA and Biodentine intraorifice barriers.
One hundred and twelve single-rooted mandibular human premolar teeth extracted from young patients (14-25 years) were chosen. Root cement and cementoenamel junction (CEJ) of teeth were examined under a stereomicroscope at 10 × magnification to ensure there was no cement defect or dentin gap in CEJ. After the endodontic access cavities were opened on the occlusal surfaces of the teeth, the working length was determined. Instrumentation of each root canal was performed with a ProTaper Gold rotary system in the determined working length and filled with gutta-percha + AH Plus with a single cone technique using. Root fillings were removed 3 mm short of the CEJ and sealed with one of the following intraorifice barrier materials (n = 30/group): 1. GIC; 2. TheraBase; 3. ProProot-MTA; 4. Biodentine. In each of the sub-groups, either HP or SP was used to perform intracoronal bleaching on days 1, 4, and 7. All outer surfaces of the specimens except the 3 mm cervical region were covered with nail polish and modeling wax layers. Specimens were immersed in a 5 ml Eppendorf tube that contained 2 mL of distilled water. The penetration of peroxide release was measured using the colorimetric ferric thiocyanate method. Statistical analysis of the data was performed with Three-way ANOVA and Tukey's test (P = 0.05).
In the HP groups, GIC showed the greatest peroxide release when compared with other tested groups on day 1 (P < 0.05). Biodentine and ProRoot MTA displayed a significantly lower peroxide leakage when compared to GIC and TheraBase on days 1 and 4 (P < 0.05). While GIC and TheraBase were used, HP observed higher peroxide penetration when compared with SP on days 1 and 4 (P < 0.05).
Peroxide diffusion was significantly influenced by the kind of intracoronal bleaching agents and intraorifice barrier materials used.
本研究旨在比较 35%过氧化氢凝胶（HP）和过硼酸钠与蒸馏水（SP）漂白剂对玻璃离子水门汀（GIC）、TheraBase、ProRoot MTA 和 Biodentine 口内屏障的封闭特性的影响。
选择 121 颗来自年轻患者（14-25 岁）的下颌单根前磨牙。在 10×放大倍率的立体显微镜下检查牙齿的根水泥和牙釉质牙骨质界（CEJ），以确保 CEJ 处没有水泥缺陷或牙本质间隙。在牙齿的咬合面上打开牙髓腔入口后，确定工作长度。用 ProTaper Gold 旋转系统在确定的工作长度内对每个根管进行器械处理，并采用单尖技术用牙胶尖+AH Plus 填充。根充至 CEJ 下 3mm 处，并使用以下口内屏障材料之一进行密封（n=30/组）：1.GIC；2.TheraBase；3.ProRoot-MTA；4.Biodentine。在每个亚组中，第 1、4 和 7 天分别使用 HP 或 SP 进行根管内漂白。除了 3mm 颈区之外的所有标本外表面都用指甲油和模型蜡层覆盖。将标本浸入装有 2ml 蒸馏水的 5ml Eppendorf 管中。使用比色铁硫氰酸盐法测量过氧化物释放的穿透性。使用三因素方差分析和 Tukey 检验（P=0.05）对数据进行统计分析。
在 HP 组中，与其他测试组相比，GIC 在第 1 天释放的过氧化物最多（P<0.05）。与 GIC 和 TheraBase 相比，Biodentine 和 ProRoot MTA 在第 1 天和第 4 天的过氧化物泄漏量明显较低（P<0.05）。当使用 GIC 和 TheraBase 时，HP 在第 1 天和第 4 天观察到的过氧化物渗透高于 SP（P<0.05）。
过氧化物的扩散受到所用根管内漂白剂和口内屏障材料的种类的显著影响。
