Effect of dentin pretreatment and curing mode on the microtensile bond strength of self-adhesive resin cements

Abstract

PURPOSEThe aim was to evaluate the effect of curing mode and different dentin surface pretreatment on microtensile bond strength (µTBS) of self-adhesive resin cements.MATERIALS AND METHODSThirty-six extracted human permanent molars were sectioned horizontally exposing flat dentin surface. The teeth were divided into 12 groups (3 teeth/group) according to the dentin surface pretreatment methods (control, 18% EDTA, 10% Polyacrylic acid) and curing mode (self-curing vs. light-curing) of cement. After pretreatment, composite resin blocks were cemented with the following: (a) G-CEM LinkAce; (b) RelyX U200, followed by either self-curing or light-curing. After storage, the teeth were sectioned and µTBS test was performed using a microtensile testing machine. The data was statistically analyzed using one-way ANOVA, Student T-test and Scheffe's post-hoc test at P<.05 level.RESULTSFor G-CEM LinkAce cement groups, polyacrylic acid pretreatment showed the highest µTBS in the self-cured group. In the light-cured group, no significant improvements were observed according to the dentin surface pretreatment. There were no significant differences between curing modes. Both dentin surface pretreatment methods helped to increase the µTBS of RelyX U200 resin cement significantly and degree of pretreatment effect was similar. No significant differences were found regarding curing modes except control groups. In the comparisons of two self-adhesive resin cements, all groups within the same pretreatment and curing mode were significantly different excluding self-cured control groups.CONCLUSIONSelecting RelyX U200 used in this study and application of dentin surface pretreatment with EDTA and polyacrylic acid might be recommended to enhance the bond strength of cement to dentin.

Effect of Surface Treatment on Shear Bond Strength between Resin Cement and Ce-TZP/Al2O3

“…Because RelyX U200 resin cement has higher filler content and viscosity, primer application to zirconia increased its wettability and allowed easier penetration of the resin cement [ 30 ]. Another study also reported that primer application dramatically increases the bond strength when RelyX U200 is used [ 31 ]. This is consistent with previous studies [ 27 , 32 ] and shows that both air-abrasion and primer application contribute to effective bonding.…”

Two-year clinical performance of cast post and core self-adhesive cementation

“…The literature has pointed that the biomechanical behavior of self-adhesive resin cements is affected by their interaction with the dentin [19]. Hattar et al [4] compared the bonding strength of three different self-adhesive cement trademarks.…”

“…Low bonding strength values were found, notably because the selfadhesive resin cements did not dissolve the smear layer, only superficially infiltrated the collagen fiber network [4]. Youm et al [19] suggested that scrubbing the dentin with 18% EDTA or 10% polyacrylic acid before cementation could significantly increase the micro tensile strength of these cements. In the present case, 18% EDTA solution was used, followed by neutralization with sterile saline solution, previously to the post cementation.…”

Emprego dos cimentos resinosos autoadesivos: uma abordagem sobre a eficácia e os protocolos empregados

“…Fatores como utilização de clorexidina 2% ou agentes quelantes como tratamento de superfície, influencia de materiais cimentantes provisórios, influencia do tempo entre a manipulação, influência do modo de cura na energia de superfície também são fatores que influenciam diretamente no processo de cimentaçã [13][14][15] .…”

“…Youm et al 13 avaliaram o efeito do modo de cura e diferentes pré-tratamentos na resistência a microretenção dos cimentos autoadesivos. Concluíram que com o RelyX U200 o pré-tratamento com EDTA ou ácido poliacrílico pode ser recomendada para aumentar a resistência de união do cimento à dentina.…”