Atmeh Amre R, Alshaiji Dhary, Abdunabi Farida, Alamri Mohammed, Khamis Amar Hassan
Hamdan Bin Mohammed College of Dental Medicine (HBMCDM), Mohammed Bin Rashid University of Medicine and Health Sciences (MBRU), Dubai, United Arab Emirates.
Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
Saudi Dent J. 2024 Feb;36(2):281-285. doi: 10.1016/j.sdentj.2023.10.025. Epub 2023 Nov 2.
During non-surgical endodontic retreatment, gutta-percha (GP) solvents are indispensable in difficult cases when used with mechanical removal, however studies comparing their efficacy against different types of GP are limited. The purpose of this study was to investigate the softening effect of three solvents on the conventional (CGP), cross-linked carrier-based (CLGP), and thermoplasticized (TGP) and compare the effect of time on the softening effect of the solvents.
Tested GP were embedded in cuboidal blocks of stone with their upper surfaces exposed (1 mm diameter). Three commercial GP solvents based on D-Limonene (DL), Eucalyptol oil (EO), and orange oil (OO) were added to the exposed GP before an indenter (weight = 1Kg) was applied. Using a digital camera, the indentation depth was measured (mm) directly after applying the solvent and indenter (T = 0), and after 1, 2, and 3 min of application (T = 1,2,3). The means of indentation depth were calculated and compared using a two-way analysis of variance and Tukey's post-hoc test to assess the effect of the types of solvent, GP for each application duration, and Friedman's test to evaluate the effect of application duration on the softening effect of solvents.
The type of GP (F = 261.43, p < 0.001), type of solvent (F = 3.57, p = 0.015), and application duration (F = 53.088, p < 0.001) were all found to significantly affect GP softening. DL exhibited the highest and only significant effect on CGP after 1 min (p < 0.05), while OO had the only significant effect against CLGP when applied for at least 2 min (p < 0.05). Both OO and EO had significant softening effects on TGP instantly or after 1 min of application, respectively.
The results of this study revealed that the softening effect of GP solvents varies depending on their type, their application duration, and the type of GP.
在非手术牙髓再治疗过程中，当与机械去除方法联合使用时，牙胶溶剂对于处理复杂病例不可或缺，然而，比较它们对不同类型牙胶疗效的研究有限。本研究的目的是调查三种溶剂对传统牙胶（CGP）、交联载体型牙胶（CLGP）和热塑型牙胶（TGP）的软化效果，并比较时间对溶剂软化效果的影响。
将测试牙胶嵌入长方体石块中，使其上表面暴露（直径1毫米）。在施加压头（重量 = 1千克）之前，向暴露的牙胶中添加三种基于D - 柠檬烯（DL）、桉叶油（EO）和橙油（OO）的市售牙胶溶剂。使用数码相机，在施加溶剂和压头后立即（T = 0）以及施加1、2和3分钟后（T = 1、2、3）直接测量压痕深度（毫米）。计算压痕深度的平均值，并使用双向方差分析和Tukey事后检验来比较，以评估溶剂类型、每种施加持续时间的牙胶类型的影响，以及使用Friedman检验来评估施加持续时间对溶剂软化效果的影响。
发现牙胶类型（F = 261.43，p < 0.001）、溶剂类型（F = 3.57，p = 0.015）和施加持续时间（F = 53.088，p < 0.001）均对牙胶软化有显著影响。DL在1分钟后对CGP表现出最高且唯一显著的效果（p < 0.05），而OO在至少施加2分钟时对CLGP有唯一显著效果（p < 0.05）。OO和EO分别对TGP立即或在施加1分钟后有显著软化效果。
本研究结果表明，牙胶溶剂的软化效果因其类型、施加持续时间和牙胶类型而异。
