Volume 29, Issue 1 (7-2016)                   jdm 2016, 29(1): 9-17 | Back to browse issues page

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Eskandarizadeh A, Ebrahimi S F, Shadman N, Rahmani S. Effect of different light curing methods on the push-out bond strength of glass fiber post to different root canal regions. jdm. 2016; 29 (1) :9-17
URL: http://jdm.tums.ac.ir/article-1-5469-en.html
1- Associate Professor, Oral Medicine Research Center, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran; Department of Operative Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
2- Assistant Professor, Oral Medicine Research Center, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran; Department of Operative Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
3- Assistant Professor, Department of Operative Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
4- Specialist in Operative Dentistry
Abstract:   (4158 Views)

Background and Aims: Slow polymerization rate in early stage of light curing process leads to higher monomers movement and entering in polymer network that cause higher mechanical properties.The aim of this study was to evaluate the effect of light activation methodes (immediate, 5 and 10 minutes delay) on the push-out bond strength of cemented fiber posts in different regions of root canal with two types of resin cements.

Materials and Methods: In sixty extracted human single canal, the teeth were decoronated from cement enamel junction and after root canal therapy, FRC postec plus were cemented with two resin cements, Duolink and Variolink 2, in three curing methods; immediate, 5 and 10 minutes of delay. After storing in a dark place for 24 hours, they were cut into three sections: coronal, middle and apical. The push-out bond strength test was performed using a universal testing machine. The failure modes were observed using a stereomicroscope. Data were analyzed using ANOVA and Tukey post hoc test (P<0.05).

Results: In Duolink, immediate light curing had significantly higher bond strength than that of two delayed methods (P>0.05). In immediate light curing method, regardless of root region, Duolink had higher push-out bond strength than that of Variolink 2 (P=0.02). In all subgroups, there were reductions in the bond strengths from coronal to apical. Mixed failure at the cement-fiber post interface was predominent in all groups.

Conclusion: 5 and 10 minutes delay caused reduction in the push-out bond strength for Variolink 2 but did not have significant effect for Duolink resin cement.

Full-Text [PDF 266 kb]   (1415 Downloads)    
Type of Study: Research | Subject: general
Received: 2016/06/22 | Accepted: 2016/06/22 | Published: 2016/06/22

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