Abstract
The aim of the study was to evaluate and to compare the interface and marginal leakage of dental composite resins using confocal laser scanning biological microscopy (CM). Ten class II cavities were prepared on the proximal surfaces of 10 extracted teeth, previously kept in 10% formalin to preserve the bonding properties of the tooth structures. Cavities were restored with dental composite resin using the �open sandwich� technique and then assessed using CM. Open marginal adaptations at the interfaces inside the composite resins were identified. The results obtained with CM helped to eliminate and reduce the background information collected from a distance from the focal plane and allowed for the acquisition of serial optical sections from thick tooth specimens. In vitro assessments were thus made using CM on the teeth structure, regarding the occurrence of potential micro-leakages at the restoration interface.
Highlights
The aim of the study was to evaluate and to compare the interface and marginal leakage of dental composite resins using confocal laser scanning biological microscopy (CM)
A bonding agent (Blue Bond, GDF) was applied to the cavities restored with the dental composite
When the substrate is aged with thermocycling, bondstrength adhesion results for composite–hard dental tissue were significantly influenced by the surface conditioning method
Summary
Ten class II cavities were prepared on the proximal surfaces of 10 teeth that were selected from a pool of extracted human permanent teeth and were graded by two examiners from the Departments of Dental Materials and Odontology according to the International Caries Detection and Assessment System (ICDAS). A bonding agent (Blue Bond, GDF) was applied to the cavities restored with the dental composite. It was followed by a 60 s light curing procedure for the composite resin. The exposure time per pixel was 8 μs and the laser wavelength was set at 405 nm; this wavelength corresponds to a blue light laser, which was found to be appropriate for the hard dental tissues and composite resins. When the substrate is aged with thermocycling, bondstrength adhesion results for composite–hard dental tissue were significantly influenced by the surface conditioning method. The restorative material-based gaps and the adhesion were assessed using the IBM SPSS software using sample statistics, considering images such as those shown, as examples, in figures 3 and 4
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