Microleakage of resin-based composite restorations using different solvent-based bonding agents and methods of drying acid-etched dentin.
OBJECTIVE
To evaluate the effect of a wet, conventionally dried, and dry bonding technique on microleakage of Class V resin-based composite (RBC) restorations bonded with three different solvent-based adhesive agents.


METHODS
Forty five extracted human premolars and molars were randomly assigned to nine groups for bonding with Syntac original, Syntac Single Component, or Syntac Sprint (all by Ivoclar/Vivadent). Cavities were cut in both the buccal and lingual surfaces. Half of each preparation was in enamel and the other was in cementum/dentin. The cavities were restored with RBC after the applications of dentin bonding agents to acid-conditioned cavities using a wet, conventionally dried, and a dry technique for each material. The teeth were thermocycled and the restorations examined microscopically for leakage using Procion Brilliant Red as a marker. SEM microphotographs were prepared from dye-labeled and non dye-labeled areas.


RESULTS
All groups showed microleakage at the gingival margins with no significant difference between the groups irrespective of the bonding material or the method of drying acid-etched dentin [Kruskal-Wallis: (ANOVA) P = 0.1858]. Neither was there a significant difference between the groups irrespective of bonding material or drying method at the enamel margin [Kruskal-Wallis: (ANOVA) P = 0.3434). SEM showed that in dye-labeled areas debonding was predominantly cohesive in resin.
Santini
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D000096:Acetone / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins; D003763:Dental Leakage; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D003890:Desiccation; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D018709:Statistics, Nonparametric; D014867:Water / Q000737:chemistry
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012997:Solvents; C078484:Syntac dentine adhesive; D014867:Water; D000096:Acetone