SEM evaluation of marginal sealing on composite restorations using different photoactivation and composite insertion methods.
Article
in English
| IMSEAR
| ID: sea-139761
ABSTRACT
Aim:
This in vitro study evaluates the influence of marginal sealing methods in composite restorations with different adhesive systems submitted to mechanical load. Materials andMethods:
Eighty bovine incisor crowns were embedded in Polyvinyl chloride (PVC) molds with the buccal surface exposed, where cavities (4mm x 4mm x 3mm) were made. Samples had the adhesive systems, Single Bond or Clearfil SE Bond, applied according to the manufacturer's recommendations. The cavities were filled with a Z-250 composite according to the restoration technique (bulk filling or three increments) and photoactivation (conventional, soft start, pulsatile light or light-emitting diode [LED]). The samples were duplicated with epoxy resin for scanning electron microscopy observations. Samples were also submitted to mechanical load (200,000 cycles; 2 Hz) and new replicas were made.Results:
The results, in percentages, were submitted to ANOVA followed by Tukey's test (P < 0.05). There was statistical difference between the cycle group (23.84%) and the non cycle group (18.63%). Comparing the restoration technique, there was no statistical difference between bulk filling (19.62%) and three increments (22.84%). There was no statistical difference among the groups Pulsatile light (24.38%), soft start (22.75%), LED (21.47%) or conventional (16.34%). Furthermore, there were no statistical differences between the adhesive systems Clearfil SE Bond (21.32%) and Single Bond (20.83%).Conclusions:
The photoactivation methods, the restorative techniques and the adhesive systems did not influence gap formation.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Polymers
/
Stress, Mechanical
/
Surface Properties
/
Materials Testing
/
Cattle
/
Microscopy, Electron, Scanning
/
Dental Bonding
/
Replica Techniques
/
Dentin-Bonding Agents
/
Bisphenol A-Glycidyl Methacrylate
Language:
English
Year:
2009
Type:
Article
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