Clinical evaluation of composite restorations in Er:YAG laser-prepared cavities re-wetting with chlorhexidine
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First online:
Abstract
Objectives
The objective of
this study was to evaluate longitudinally the composite restorations,
performed in cavities prepared by Er:YAG or conventional bur, and dentin
re-wetting with water or chlorhexidine.
Materials and methods
Twenty individuals
with four active caries with cavitation reaching the dentin located on
the occlusal surface of molars counterparts are selected. The teeth of
each individual were randomly assigned into four groups: (I) Er:YAG
laser (260 mJ/4 Hz) re-wetting with chlorhexidine, (II) Er:YAG laser
(260 mJ/4 Hz) re-wetting with deionized water, (III) conventional method
re-wetting with chlorhexidine, and (IV) conventional method re-wetting
with deionized water. The teeth were isolated, prepared cavities,
phosphoric acid etching, and re-wetting according to previously assigned
method. Restoration was performed employing the Single Bond 2 and
Z350XT resin. Clinical follow-up was held after the polishing of the
restoration (baseline) and 6 and 12 months of the making of the
restoration using the modified USPHS criteria. The restorations were
qualitatively analyzed by means of photographs. In the evaluation
period, replicas of the restorations were analyzed by SEM. Data were
analyzed by statistics using chi-square test (p < 0.05).
Results
After 12 months of
clinical evaluation, groups prepared with laser and re-wetting with
chlorhexidine and water showed the lowest marginal staining value. There
was no statistical difference between the groups for other factors. SEM
analysis revealed that a non-expressive amount of restorations showed
gaps and irregularities of tooth-restoration interface after 6 and
12 months compared to the baseline.
Conclusion
The restorations
performed in laser-prepared cavities, regardless of the re-wetting,
presented the best clinical performance over the evaluated period.
Clinical relevance
Laser-prepared teeth, regardless of re-wetting, showed greater resistance to marginal discoloration.
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