Prawatvatchara Wisarut, Angkanawiriyarak Somphote, Klaisiri Awiruth, Sriamporn Tool, Thamrongananskul Niyom
Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok 10330, Thailand.
Faculty of Dentistry, Chulalongkorn University, Bangkok 10330, Thailand.
Polymers (Basel). 2023 Oct 3;15(19):3984. doi: 10.3390/polym15193984.
This investigation evaluated the effects of aprotic solvents, i.e., tetrahydrofuran, pyridine, and morpholine, compared with hydrogen peroxide, on the surfaces of fiber-reinforced composite posts with a composite core based on the microtensile bond strength. In total, 150 FRC Postec Plus posts and 150 D.T. Light-Posts were randomly divided into three groups (non-thermocycling, 5000-cycle, and 10,000-cycle thermocycling groups). Each group was divided into five subgroups according to the post-surface treatment: C, non-treatment group; HO, immersed in 35% hydrogen peroxide; THF, immersed in tetrahydrofuran; PY, immersed in pyridine; and MP, immersed in morpholine. The treated specimens were placed in the bottom of a plastic cap and filled with a composite core material in preparation for the microtensile bond test. The data were evaluated using one-way ANOVA and Tukey's test ( < 0.05) as well as an independent t-test ( < 0.05). For the surface roughness, white light interferometry was used for measurement, and the mean surface roughness was analyzed via one-way ANOVA and Tukey's test ( < 0.05). The results showed that, under non-thermocycling conditions, the PY subgroup with D.T. Light-Post had the highest microtensile bond strength, followed by THF, MP, HO, and the control groups. For FRC Postec Plus, the PY group had the highest microtensile bond strength, followed by MP, THF, HO, and the control groups. Although the thermocycling conditions decreased the microtensile bond strength in all groups, the PY subgroup still had the highest value. An independent t-test revealed that even under all non-thermocycling and 5000- and 10,000-cycle thermocycling conditions, D.T. Light-Post in the PY subgroup displayed significantly higher microtensile bond strengths than FRC Postec Plus in the PY subgroup. While the surface roughness of the fiber-reinforced composite posts showed that the posts treated with pyridine possessed the highest surface roughness for each material type, In conclusion, as an aprotic solvent, pyridine generates the highest microtensile bond strength between the interfaces of composite cores and fiber-reinforced composite posts.
本研究基于微拉伸粘结强度，评估了非质子溶剂（即四氢呋喃、吡啶和吗啉）与过氧化氢相比，对带有复合芯的纤维增强复合桩表面的影响。总共150根FRC Postec Plus桩和150根D.T. Light-Post桩被随机分为三组（非热循环组、5000次循环热循环组和10000次循环热循环组）。根据桩表面处理方式，每组又分为五个亚组：C组，未处理组；HO组，浸入35%过氧化氢中；THF组，浸入四氢呋喃中；PY组，浸入吡啶中；MP组，浸入吗啉中。将处理后的标本置于塑料盖底部，并用复合芯材料填充，以准备进行微拉伸粘结试验。数据采用单因素方差分析和Tukey检验（<0.05）以及独立t检验（<0.05）进行评估。对于表面粗糙度，使用白光干涉测量法进行测量，并通过单因素方差分析和Tukey检验（<0.05）分析平均表面粗糙度。结果表明，在非热循环条件下，D.T. Light-Post的PY亚组微拉伸粘结强度最高，其次是THF组、MP组、HO组和对照组。对于FRC Postec Plus，PY组微拉伸粘结强度最高，其次是MP组、THF组、HO组和对照组。尽管热循环条件降低了所有组的微拉伸粘结强度，但PY亚组的值仍然最高。独立t检验显示，即使在所有非热循环以及5000次和10000次循环热循环条件下，PY亚组中的D.T. Light-Post的微拉伸粘结强度也显著高于PY亚组中的FRC Postec Plus。虽然纤维增强复合桩的表面粗糙度表明，对于每种材料类型，经吡啶处理的桩表面粗糙度最高，但总的来说，作为一种非质子溶剂，吡啶在复合芯与纤维增强复合桩的界面之间产生的微拉伸粘结强度最高。
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