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Microleakage evaluation of restorations prepared with air abrasion
1Department of Pediatric Dentistry, University of Minnesota, USA.
Purpose:
The objective of this in-vitro study was to measure and compare microleakage around preventive resin restorations prepared conventionally or with air abrasion, in the presence or absence of acid etching.
Methods:
One hundred extracted human non carious molars were assigned to each of four groups. Group A: fissures opened with a high speed handpiece, etched, and restored with composite and sealant. Group B: fissures opened with KCP 1000 and restored with composite and sealant. Group C: fissures opened with KCP 1000, etched, and restored with composite and sealant. No adhesive was used for groups A, B, or C. Group D: fissures opened with KCP 1000, adhesive resin was applied, cured, and restored with composite and sealant. All teeth were thermocycled, stained with silver nitrate, sectioned and viewed with a computer linked measuring microscope. Measurements were recorded in relative percentages and absolute millimeters.
Results:
One-way ANOVA and two sample independent t-test showed no statistical significance between groups A and C, or between groups B and D. Statistically significant differences were found among groups A and B, groups A and D, groups B and C, and groups C and D (P < 0.0001).
Conclusion:
The use of air abrasion alone does not provide adequate sealability of preventive restorations.