Bond strength and fracture analysis between resin cements and root canal dentin

Abstract

The aim of this research is to evaluate bond strength between translucent fibre posts (White Post DC, FGM or FRC Postec Plus, Ivoclar/Vivadent) and intraradicular dentin at three different levels (cervical, middle and apical) using a dual-cure (AllCem, FGM) or self-curing (Multilink, Ivoclar/Vivadent) resin cement. Also, the fracture type after push-out test was analysed under SEM. Thirty-two extracted single-root teeth were selected. After undergoing endodontic therapy, they were randomly divided into four groups according to their post type and resin cement. Root canals were etched using 37% phosphoric acid, and Excite DSC adhesive (Ivoclar/Vivadent) was applied in all groups. The root was sectioned to obtain nine 1-mm-thick slices (three per third: coronal, middle, apical). All slices were subjected to push-out tests. Data were analysed using two-way anova. The mean bond strengths vary from 6.6 (4.6) MPa [apical] to 11.9 (5.9) MPa [cervical]. There were no significant differences between groups. Pearson χ(2)-test revealed significant differences in fracture types for all groups (P < 0.0001). The apical third had the lowest bond strengths and it was also shown to be the most critical region for luting fibre posts.

Influence of monolithic lithium disilicate and zirconia thickness on polymerization efficiency of dual‐cure resin cements

“…Resin cements are recommended for luting anterior monolithic ceramic restorations because of low solubility, better esthetics provided by matching with the ceramic shade, an improved marginal seal, and a high bond strength . Dual‐cure resin cements are favorable materials for the cementation of all‐ceramic restorations because they take advantage of both light‐ and chemical‐cure mechanisms to guarantee adequate and complete polymerization of the material in case of insufficient light activation . However, some investigators state that the two components do not completely interact in all cases .…”

“…[6][7][8][9][10] Dual-cure resin cements are favorable materials for the cementation of all-ceramic restorations because they take advantage of both light-and chemical-cure mechanisms to guarantee adequate and complete polymerization of the material in case of insufficient light activation. [11][12][13][14] However, some investigators state that the two components do not completely interact in all cases. [15][16][17] Previous studies showed that the microhardness of dual-cure resin cements was lower than that of self-cure cements in case of insufficient light activation beneath a ceramic restoration with a 3-mm thickness.…”

Effect of Different Surface Treatments on Cone Beam Computed Tomography Image and Push Out Bond Strength of Conventional and Reinforced Fiber Posts.

“…[42][43] Post de bonding turned out to be the most frequent failure of endodontic ally treated teeth restored with post and core systems, 44 whereas vertical root fractures were the most serious type of failure. [45][46] Adhesively luted posts revealed improved retention compared to conventionally cemented posts, and thus might reduce the incidence of de bonding 47 ,so in the present study the adhesive resin cement was selected.…”

Post boşluğuna bağlayıcı uygulamalarının kendinden bağlanabilen rezin siman kullanılarak yapıştırılan fiber postların push-out bağlanma dayanımlarına etkileri

“…18 Post tipinden bağımsız olarak en yüksek bağlanma dayanımının koronal, en düşük bağlanma dayanımının ise apikal bölgede olduğu bildirilmiştir. [18][19][20][21][22] Bu durumun nedenleri arasında post boşluğunun apikal kısmına ulaşma güçlüğü, simanın apikal bölgeye tam olarak uygulanmasındaki zorluklar ve bunlara bağlı mikro boşlukların oluşması ya da o bölgede kök kanal dolgu materyali ve kanal patı artıklarının kalmış olması 18,19,21,[23][24][25][26] , dentin tübül sayısının apikal bölgelere gidildikçe azalması 27 , koronal bölgeye bağlayıcı ajanların daha kolay uygulanması ve polimerizasyon için kullanılan ışık kaynaklarının apikal bölgeye göre bu bölgede daha etkili olabilmesi 28 olarak özetlenebilir. Post restorasyonlarında başarısızlığa yol açabilen bu faktörlerin kökün farklı bölgelerinde değerlendirilmesinin büyük önem taşıması açısından çalışmamızda farklı bağlayıcı yaklaşımların bağlanma dayanım değerleri, kökün farklı bölgelerinde incelendi.…”