Microleakage of All-ceramic Crowns Using Self-etching Resin Luting Agents

Abstract

SUMMARYSelf-etching adhesive systems are a new generation of materials that possess acidic methacrylates that can generate self-adhesion. There is limited data reported on the marginal leakage of ceramic restorations bonded with self-etching adhesive materials. This study assessed and compared the amount of microleakage of bonded ceramic crowns using three different types of self-etching adhesive systems with and without a die spacer.Eighteen human molars were prepared for allceramic IPS Empress crowns and the teeth were randomly assigned to each experimental group. The buccal side had the preparation finish line 1.5 mm below the CEJ, and the lingual finish line was 1.5 mm above the CEJ, creating margins in enamel and dentin. Two die-spacing techniques were used (three layers or no layer of die spacer). Each crown restoration was cemented with one of three self-etching resin luting agents (Panavia F 2.0, Multilink and RelyX Unicem). The specimens were thermally cycled for 1000 cycles, then immersed in a 5% methylene blue dye solution for 24 hours. The teeth were then rinsed, embedded in clear epoxy resin and sectioned. A total of 60 sections were evaluated for each type of resin luting agent using digital image analysis at 70x magnification. A novel formula, using mean percentage of microleakage, was developed by dividing the extent of dye penetration along the tooth/resin luting cement interphase and the total perimeter of the tooth crown surface. The data were analyzed using three-way analysis of variance at the 0.05 level of significance. Fisher's PLSD intervals were calculated for comparing significant means. Panavia F 2.0 showed a lower degree of microleakage than RelyX Unicem and Multilink Clinical RelevanceAmong the self-adhesive resin cements, Panavia F 2.0 demonstrated less microleakage than RelyX Unicem or Multilink, whether or not a die spacer technique was used.at both the enamel and dentin margins. Interactions of the main effects (cement, margin and die spacer technique) were all highly significant (p≤0.004). The degree of microleakage was higher on the dentin margins than on the enamel margins (p<0.0001). The degree of microleakage for the die spacer group was not significantly different from the group with no die spacer technique (p>0.1).Overall, Panavia F 2.0 showed the least microleakage, followed by RelyX Unicem and Multilink, respectively.

Failure load of teeth restored by use of alumina copings: Influence of residual tooth structure and cementation

“…Among the luted crowns, failure loads for severely damaged teeth were higher for the Panavia F2.0 group, as shown by ANOVA and the unpaired two sample t-test. This is in good agreement with studies investigating the bond strength between dentine and luting agents 34) , microleakage 35) , the load fatigue of compromised teeth after use of different luting cements 36) , and the fracture resistance of alumina copings 8) ; in all of these, behaviour of composite resin cements was superior to that of modified resin cements. The catastrophic test results for the crowns fixed with glass ionomer cement, i.e.…”

Microleakage of composite resin restorations: Authors’ reply

“…Methylene blue is in common use for the assessment of microleakage, as gauged by the contemporary (2007)(2008) literature in adhesive dentistry and in the assessment of dentine permeability. [4][5][6][7][8] Use of immersion rather than vacuum methods is commonplace with methylene blue tracer dyes in such studies, and is in line with our work on adhesive interactions; we agree however that vacuum methods may be appropriate when considering the root canal situation, where diffusion alone would not give adequate penetration over time.…”

“…3 Dye leakage can be conducted under vacuum pressure, since the validity of dye leakage studies has been questioned because of the possible effect of entrapped air on the ingress of the dye solution. 4 Studies have reported that vacuum pressure decreases the volume of entrapped air and allows complete dye penetration. 5 Also, the authors in this study have not mentioned which type of curing light was used, since the type of curing light accounts for the degree of polymerization shrinkage of composite resin which in turn affects the microleakage.…”

Microleakage and Marginal Gap of Adhesive Cements for Noble Alloy Full Cast Crowns

“…[3][4][5][6] Conventional dentin bonding agents are based on smear layer removing or dissolving techniques. These adhesive systems need several steps of application and most of them are technique sensitive.…”