IADR Abstract Archives
The effect of various pre-treatments to root canal dentine on the push out bond strength of fiber post
Objectives: To evaluate the effect of different pre-treatments such as various irrigation solutions and laser-activated (LAI) technique, to root canal dentine on the push out bond strength (PBS) to fiber post.
Methods: Sixty freshly extracted mandibular single-rooted premolars were divided into six groups (n=10) according to the final irrigating solution used for the removal of the smear layer, as follows: group N, 5 mL 2.5% NaOCl; group E, 5 mL 17% EDTA; group Q, 5 mL QMİX; group NL, 5 mL 2.5% NaOCl with LAI, group EL, 5 mL 17% EDTA with LAI, and group QL, 5 mL QMİX with LAI. Then, the fiber posts were also covered with a thin layer of a silane agent and dual-cure resin cement was applied on the surface of the fiber post and into the canal space with using a lentulo spiral. All specimens were subjected to PBS test at a crosshead speed of 0.5 mm/min in an apical-to-cervical direction until the post was dislodged. Data were analyzed with one-way ANOVA, Paired-Samples t test and Independent-Samples t test (α=0.05).
Results: There were no statistically significant differences among the groups, regardless of the different levels in all LAI groups. But, there were statistically significant differences were observed among the needle groups, when each irrigation techinuques were evaluated separately (p<0.05) Furthermore, when the RBS values of the different levels of the dentine were compared within each irrigation groups, the only significant difference was detected for group N (between apical and middle level, between apical and coronal level), group E, group Q and group NL (between coronal and middle level) (p<0.05).
Conclusions: Within the limitations of this study, it can be concluded that LAI technique when used with 2.5% NaOCl, had a significant effect on the amount of bonding between fiber post to root canal dentine.
Methods: Sixty freshly extracted mandibular single-rooted premolars were divided into six groups (n=10) according to the final irrigating solution used for the removal of the smear layer, as follows: group N, 5 mL 2.5% NaOCl; group E, 5 mL 17% EDTA; group Q, 5 mL QMİX; group NL, 5 mL 2.5% NaOCl with LAI, group EL, 5 mL 17% EDTA with LAI, and group QL, 5 mL QMİX with LAI. Then, the fiber posts were also covered with a thin layer of a silane agent and dual-cure resin cement was applied on the surface of the fiber post and into the canal space with using a lentulo spiral. All specimens were subjected to PBS test at a crosshead speed of 0.5 mm/min in an apical-to-cervical direction until the post was dislodged. Data were analyzed with one-way ANOVA, Paired-Samples t test and Independent-Samples t test (α=0.05).
Results: There were no statistically significant differences among the groups, regardless of the different levels in all LAI groups. But, there were statistically significant differences were observed among the needle groups, when each irrigation techinuques were evaluated separately (p<0.05) Furthermore, when the RBS values of the different levels of the dentine were compared within each irrigation groups, the only significant difference was detected for group N (between apical and middle level, between apical and coronal level), group E, group Q and group NL (between coronal and middle level) (p<0.05).
Conclusions: Within the limitations of this study, it can be concluded that LAI technique when used with 2.5% NaOCl, had a significant effect on the amount of bonding between fiber post to root canal dentine.