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The Journal of Adhesive Dentistry
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J Adhes Dent 21 (2019), No. 2     12. Apr. 2019
J Adhes Dent 21 (2019), No. 2  (12.04.2019)

Page 143-148, doi:10.3290/j.jad.a42325, PubMed:30949627


Effect of Sterilization on Bond Strength and Mechanical Properties of Fiber Posts
Yagci, Filiz / Ustun, Yakup / Zortuk, Mustafa / Agirnasligil, Mehmet
Purpose: To determine the effects of two different sterilization methods on the pull-out bond strength, flexural strength, and elastic modulus of glass-fiber posts.
Materials and Methods: A total of 69 glass-fiber posts were used. The posts were divided into three groups according to applied sterilization method: 1) control, 2) ethylene oxide gas (EOG), and 3) autoclave. The microstructure of three posts from each group was evaluated by SEM and energy-dispersive X-ray spectroscopy (EDS). Thirty glass-fiber posts were used to evaluate pull-out bond strength. The three-point bending test was performed to analyze the flexural strength on another 30 glass-fiber posts. Failure modes were categorized microscopically after the pull-out test. After the three-point bending test, micromorphology at the bending area was examined using SEM.
Results: One-way ANOVA indicated no statistically significant differences among the group means in terms of bond strength (p > 0.05), flexural strength (p > 0.05), or elastic modulus (p > 0.05). EDS revealed that the weight percentage of surface oxygen atoms in the EOG- and autoclave-sterilization groups were significantly higher. SEM images were similar.
Conclusion: The results of this study show that glass-fiber posts can be sterilized either by autoclave or EOG when necessary, without any negative effect on bond strength, flexural strength, or elastic modulus.

Keywords: autoclave sterilization, bond strength testing, elastic modulus, ethylene oxide gas sterilization, glass-fiber post