An in vitro comparison of different adhesive strategies on the micropush-out bond strength of a glass fiber post

Objectives: To evaluate in vitro the push-out bond strengths of a glass fiber post adhesively luted with self-etchingresin based and self-adhesive luting cements, as well as modified application procedure of self-adhesive lutingcements in combination with single step self-etch adhesives.Materials and methods: Fifty single-rooted human maxillary central incisor teeth were endodontically treated anddivided into five groups (n=10). Glass fiber posts (RelyX Fiber Post) were cemented with the following materials:group 1: ED Primer II/Panavia F 2.0 (PAN); group 2: RelyX Unicem (RU); group 3: Maxcem (MC); group 4:Adper Prompt L-Pop (PLP)/RelyX Unicem; group 5: Optibond all-in-one (OB)/Maxcem. Bonded specimens werecut (1-mm-thick sections) and push-out tests were performed (crosshead-speed, 0.5 mm/min). Data were analyzedby one-way ANOVA followed by the Tukey-HSD test for post hoc comparisons at á = 0.05.Results: The highest bond strength was recorded for groups 4 and 2, with no statistically significant differencesamong them (p>0.05). Group 4 showed significantly higher bond strength than group 1 (p<0.001), group 3(p<0.0001) and group 5 (p<0.0001). Group 1 showed significantly higher bond strength than the group 3 (p<0.05).No statistically significant differences were observed among group 1 and group 2, group 1 and group 5, group 3and group 5. Group 3 showed significantly lower push-out bond strength than the all other luting strategies exceptfor the group 5.Conclusions: The push-out bond strength values of modified application procedure of self-adhesive luting cements(RU and MC) in combination with single step self-etch dentin adhesives (PLP and OB) did not improve the pushoutbond strength of fiber post when compared with those where the conventional use of self-adhesive cements (AU)

An in vitro comparison of different adhesive strategies on the micro push-out bond strength of a glass fiber post.

OBJECTIVES: To evaluate in vitro the push-out bond strengths of a glass fiber post adhesively luted with self-etching resin based and self-adhesive luting cements, as well as modified application procedure of self-adhesive luting cements in combination with single step self-etch adhesives. MATERIALS AND METHODS: Fifty single-rooted human maxillary central incisor teeth were endodontically treated and divided into five groups (n=10). Glass fiber posts (RelyX Fiber Post) were cemented with the following materials: group 1: ED Primer II/Panavia F 2.0 (PAN); group 2: RelyX Unicem (RU); group 3: Maxcem (MC); group 4: Adper Prompt L-Pop (PLP)/RelyX Unicem; group 5: Optibond all-in-one (OB)/Maxcem. Bonded specimens were cut (1-mm-thick sections) and push-out tests were performed (crosshead-speed, 0.5 mm/min). Data were analyzed by one-way ANOVA followed by the Tukey-HSD test for post hoc comparisons at a = 0.05. RESULTS: The highest bond strength was recorded for groups 4 and 2, with no statistically significant differences among them (p >0.05). Group 4 showed significantly higher bond strength than group 1 (p <0.001), group 3 (p <0.0001) and group 5 (p <0.0001). Group 1 showed significantly higher bond strength than the group 3 (p <0.05). No statistically significant differences were observed among group 1 and group 2, group 1 and group 5, group 3 and group 5. Group 3 showed significantly lower push-out bond strength than the all other luting strategies except for the group 5. CONCLUSIONS: The push-out bond strength values of modified application procedure of self-adhesive luting cements (RU and MC) in combination with single step self-etch dentin adhesives (PLP and OB) did not improve the push-out bond strength of fiber post when compared with those where the conventional use of self-adhesive cements.