Abstract
The present investigation observed the sealing ability of low shrinkage composite resins in large and deep cavities, placed and photocured in one increment. Large, deep cavities (5.0 mm diameter and 2.5 mm deep) surrounded by enamel were prepared in bovine teeth, which were then divided into five groups. Groups 1, 2, 3 and 4: acid conditioning + Adper Single Bond (3M/ESPE, St Paul, MN, USA) and restoration with Aelite LS Posterior (BISCO Inc. Schaumburg, IL, USA) (G1); Filtek Z-350 (3M/ESPE,St Paul, MN, USA) (G2); Filtek Z-350 Flow (3M/ESPE, St Paul, MN, USA) (G3); Premisa (KERR Corporation, Orange, CA, USA) (G4). Group 5: Silorane Adhesive system (3M/ESPE, St Paul, MN, USA) + restoration with Filtek Low Shrinkage Posterior P90 (3M/ESPE, St Paul, MN, USA). After polymerization, the teeth were immersed in 0.5% basic fuchsine solution and immediately washed. Using the Imagetool Software, the extent of dye along the margins was calculated as a percentage of total perimeter. The restorations were then transversally sectioned and the depth of dye penetration was calculated in mm, using the same software. Kruskal-Wallis analysis for all groups showed no statistical differences for extent (p = 0.54) or depth (p = 0.8364) of dye penetration. According to this methodology, the so-called low shrinkage composite resins had the same sealing ability compared to regular and flowable nanocomposite materials.
Highlights
Composite resin/adhesive systems have become the first choice for direct restoration
Marginal Adaptation - Extent of Dye Pene tration: Table 2 summarizes the results according to the extent of dye penetration along the margins
Marginal Adaptation - Depth of Dye Pene tration: Table 3 depicts in millimeters the mean depth of dye penetration
Summary
Composite resin/adhesive systems have become the first choice for direct restoration. The proposal of this in vitro study is to assess the sealing ability, for depth and extent, of different types of composite resins, some of them advertising low shrinkage values, in large and unfavorable C-factor cavities restored in one increment. The hypothesis to be tested is that the LSC (Aelite/BISCO, Premisa/Kerr, P-90/3M-ESPE) produce less marginal breakdown after polymerization, when placed in large and unfavorable C-factor cavities using bulk filling technique, as compared to conventional (Z350/3M-ESPE) and Low Viscosity (Z-350 Flow/3MESPE) nanocomposite resins associated with conventional two-step etch-and-rinse adhesives
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