Abstract
ObjectivesThe aim of this study was to investigate the bond strength of ceramic restorations luted using a self-adhesive resin cement (RelyX Unicem, 3M ESPE) under different dentin conditions.Material and MethodsIn the experimental groups, ceramic restorations were luted to bovine incisors with RelyX Unicem under the following conditions: [Dry dentin]: surface was dried using air stream for 15 s; [Moist dentin]: excess dentin moisture was removed with absorbent paper; [Bonding agent]: Clearfil SE Bond (Kuraray) self-etching adhesive system was previously applied to dentin. In the Control group, cementation was done using an etch-and-rinse adhesive (Excite DSC) and Variolink II resin cement (Ivoclar Vivadent). Photoactivation of the resin cements was performed with UltraLume LED 5 unit (Ultradent). The restorations (n=5 per group) were sectioned into beams and microtensile testing was carried out. Data were subjected to ANOVA and Tukey's test (p<0.05). Failure modes were classified under Scanning Electron Microscopic (SEM) (×120 magnification).ResultsThe bond strength was dependent on the moisture status of the dentin. Bond strength in the "dry dentin group" was significantly lower than that of all other groups, which showed similar results. A predominance of mixed failures was detected for the control group, while a predominance of adhesive failures was observed for the "bonding agent" and "dry dentin" groups. The "moist dentin" group presented predominantly cohesive failures within the luting material. The previous application of a self-etching adhesive showed no significant effect.ConclusionsOnly excess dentin moisture should be removed for the cementation of ceramic restorations with self-adhesive resin cements.
Highlights
The luting procedure of ceramic restorations requires several sequential steps, and the use of adhesive systems associated with resin-based luting agents is very common1,2,12
The group in which the bonding ZDV SHUIRUPHG RQ GU\ GHQWLQ SUHVHQWHG VLJQL¿FDQWO\ lower bond strength compared with all remaining groups (p
The self-adhesive resin luting agent presented lower bond strength when applied to the dry compared with the moist dentin substrate (p
Summary
The luting procedure of ceramic restorations requires several sequential steps, and the use of adhesive systems associated with resin-based luting agents is very common. The self-etching approach potentially reduces the occurrence of the postoperative sensitivity that may occur GXH WR LQFRPSOHWH LQ¿OWUDWLRQ RI WKH GHPLQHUDOL]HG dentin. Self-adhesive luting materials were introduced in an endeavor to reduce the number of cementation steps by eliminating the previous application of bonding agent or other pre-treatment of the tooth. Self-adhesive luting materials were introduced in an endeavor to reduce the number of cementation steps by eliminating the previous application of bonding agent or other pre-treatment of the tooth5,8,14-16 The use of these materials should SUHYHQW WKH LQFRPSOHWH LQ¿OWUDWLRQ RI GHQWLQ DQG UHGXFH the occurrence of postoperative sensitivity. Their adhesive properties are attributed to acidic monomers that simultaneously demineralize and infiltrate the tooth substrate, resulting in micromechanical retention. Secondary reactions have been suggested to provide additional chemical bonding to the dental hard tissues
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