Abstract:
Objective: The purpose of this study was to examine the effect of aprotic solvents, which were tetrahydrofuran, pyridine, and morpholine, compared to hydrogen peroxide on surface roughness of fiber-reinforced composite post and microtensile bond strength between fiber-reinforced composite post surfaces and the composite core. Material and methods: A total of 75 FRC posts plus, and 75 D.T. light posts were divided into 3 groups (non-thermocycling, 5,000-cycle and 10,000cycle thermocycling groups). Each group was divided into five subgroups according to the post-surface treatment: C: non-treatment group; H2O2: immersing with 35% hydrogen peroxide; THF: immersing with tetrahydrofuran; PY: immersing with pyridine; MP: immersing with morpholine. After 1 minute of immersion, all specimens were rinsed with deionized water, dried with an air blow, silane and bonding agent application, placed in the bottom of the plastic cap, filled with composite core material and prepared specimens for the microtensile bond test. After microtensile testing, Stereo microscope was used to evaluate mode of failure on all specimens at 40x magnification. White light interferometry and scanning electron microscopy (SEM) were utilized to evaluate surface roughness for each surface treatment. A one-way ANOVA was used to analyze all of 3 groups
