Effect of aging and cementation systems on the bond strength to root dentin after fiber post cementation

Abstract

This study evaluated the effect of aging and cementation of fiber posts using glass ionomer and resin cements on push-out bond strength, failure mode, and resin tag formation. One hundred and twenty bovine incisors were used. After post-space preparation, the specimens were randomly allocated into 12 groups (n = 10) according to the cementation system used: GC - GC Gold Label Luting & Lining); RL - RelyX Luting 2; MC - MaxCem Elite; RU - RelyX U200 and the aging periods (24 hours, 6 months, and 12 months). Slices from the cervical, middle, and apical thirds were obtained and analyzed by push-out bond strength test and confocal laser scanning microscopy. One-way ANOVA and Tukey’s post-hoc test was used at a significance level of 5%. For the push-out bond strength test, no differences among GC, RU, and MC in the cervical and middle thirds were observed, regardless of the period of storage (P > 0.05). In the apical third, GC and RU showed similar bond strength but higher than other groups (P > 0.05). After 12 months, GC showed the highest bond strength (P < 0.05). Bond strength to post-space dentin decreased over time, regardless of the cementation system used. Cohesive failure was the most frequent, regardless of the period of storage, cementation system, and post-space third. Tag formation was similar among all groups. After 12 months, GC showed the highest bond strength values.

Comparative study of physical-chemical properties of bioactive glass ionomer cement

“…Knoop micro-hardness evaluation (MI) was made on a microhardness testing machine (Shimadzu HMV - G 21S, Barueri, SP, Brazil). Three 3 indentations were made on each surface by using a force of 0.25g for 5s. The values were recorded and analyzed by the device’s software.…”

“…Nádia Buzignani Pires Ramos 1 , Klissia Romero Felizardo 2 , Sandrine Bittencourt Berger 3 , Ricardo Danil Guiraldo 3 , Murilo Baena Lopes 3 .…”

“…Glass ionomer cement are versatile material used in dentistry as restorative, base, or liner materials due to its features such as biocompatibility, fluoride release, chemical adhesion to dental tissue, and low toxicity 1 , 2 , 3 . However, ionomer cement presents some clinical disadvantages, such as fragility and initial sensitivity to humidity, a fact that can reduce restoration life span.…”