KMID : 1023820160080020101
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The Journal of Advanced Prosthodontics 2016 Volume.8 No. 2 p.101 ~ p.109
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3D micro-CT analysis of void formations and push-out bonding strength of resin cements used for fiber post cementation
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Ismail Hakk©¥ Uzun
Meral Arslan Malkoc Ali Keles Ayse Tuba Ogreten
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Abstract
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PURPOSE : To investigate the void parameters within the resin cements used for fiber post cementation by micro-CT (¥ìCT) and regional push-out bonding strength.
MATERIALS AND METHODS : Twenty-one, single and round shaped roots were enlarged with a low-speed drill following by endodontic treatment. The roots were divided into three groups (n=7) and fiber posts were cemented with Maxcem Elite, Multilink N and Superbond C&B resin cements. Specimens were scanned using ¥ìCT scanner at resolution of 13.7 ¥ìm. The number, area, and volume of voids between dentin and post were evaluated. A method of analysis based on the post segmentation was used, and coronal, middle and apical thirds considered separately. After the ¥ìCT analysis, roots were embedded in epoxy resin and sectioned into 2 mm thick slices (63 sections in total). Push-out testing was performed with universal testing device at 0.5 mm/min cross-head speed. Data were analyzed with Kruskal?Wallis and Mann?Whitney U tests (¥á=.05).
RESULTS : Overall, significant differences between the resin cements and the post level were observed in the void number, area, and volume (P<.05). Super-Bond C&B showed the most void formation (44.86 ¡¾ 22.71). Multilink N showed the least void surface (3.51 ¡¾ 2.24 mm2) and volume (0.01 ¡¾ 0.01 mm3). Regional push-out bond strength of the cements was not different (P>.05).
CONCLUSION : ¥ìCT proved to be a powerful non-destructive 3D analysis tool for visualizing the void parameters. Multilink N had the lowest void parameters. When efficiency of all cements was evaluated, direct relationship between the post region and push-out bonding strength was not observed.
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KEYWORD
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Fiber post, Resin cement, Micro ct, Void formation, Push-out bonding
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