Author/Authors :
Mokhtari, Fatemeh Department of Endodontics - Dental School, Shahid Sadoughi University of Medical Sciences, Yazd , Anvar, Ehsan , Mirshahpanah, Mostafa , Hemati, Hamidreza Department of Endodontics - Dental School, Shahid Sadoughi University of Medical Sciences, Yazd , Danesh Kazemi, Alireza Department of Restorative Dentistry - Dental School, Shahid Sadoughi University of Medical Sciences, Yazd
Abstract :
Introduction: The aim of this study was to evaluate the effect of root canal irrigants on the
microtensile bond strength of 2-step self-etch adhesive to dentin. Methods and Materials: In
this study 36 sound extracted human third molars were used. After grinding 3 mm of
occlusal surface, teeth were randomly divided into 6 groups based on irrigation material
naming normal saline, 5.25% sodium hypochlorite (NaOCl) and 2% chlorhexidine (CHX)
and also irrigation time (5 or 30 min). Next, teeth were restored with Clearfil SE bond
adhesive resin system and Z250 composite. The teeth were then thermo cycled by thermo
cycling machine, for 500 cycles between 5º and 55ºC with 60 sec dwell time and 12 sec transfer
time. All samples were sectioned into bucco-lingual slabs. The sections were submitted to
the micro tensile testing machine at a crosshead speed of 0.5 mm/min until fracture. Data
was analyzed using the one-way ANOVA test with the level of significance set at 0.05.
Results: Irrigation with normal saline, 5.25% NaOCl and 2% CHX for 5 or 30 min did not
significantly change the microtensile bond strength of adhesive to dentin (P=0.729 for time
and P=0.153 for material). However the maximum and minimum microtensile bond
strength was attributed to normal saline (44.13 N) and NaOCl (31.29 N) groups, respectively.
Conclusion: Iirrigation solution and time have no influence on microtensile bond strength
of two-step self-etch adhesive to coronal dentin.
