Objectives. The aim of this in-vitro study was to evaluate the effect of three different mechanical preparations (1) bur preparation (2) air abrasion (3) erbium, chromium: yttrium-scandium-gallium-garnet (Er,:CrYSGG) laser on the microleakage of the self-adhesive pits and fissure sealant "Embrace™ WetBond™".
Methods. Forty extracted non-carious and non-restored human 3rd molars were randomly divided into four equal groups according to the fissure preparation: (1) No mechanical preparation (acid etching only); (2) Bur preparation and acid etching; (3) Air Abrasion and acid etching; (4) (Er, Cr: YSGG) laser preparation and acid etching. Embrace™ WetBond™ sealant was applied according to the manufacturer instructions. Samples were: Thermocycled (5/55 degrees C; X500); Immersed in a 1% solution of methylene blue for 24 hours; Sectioned buccolingually into two parallel cuts yielding 3 sections and 4 surfaces per tooth for analysis; and examined for marginal microleakage using a binocular microscope at 60x magnification. Kruskal-Wallis test was used to analyze for significant differences in microleakage between treatment groups at the tooth level. Mann Whitney test was performed to compare pairs of groups.
Results. The air abrasion group had the most sealants exhibiting no leakage at 60%. The control group (acid etch only) showed no leakage in 50% of sealant, while the bur group showed no leakage in 30% of the samples. Microleakage of the Er.Cr,YSGG laser/acid group, showed to be statistically significant different (p=0.000<0.001) from the other 3 groups, and produced the most microleakage. No difference was found in microleakage between the traditional acid etch treatment and air abrasion or bur followed by acid etching.
Conclusions. Neither air-abrasion nor bur enameloplasty with acid-conditioning produced less microleakage at the enamel-sealant interface than the traditional pumice prophylaxis and acid-etching technique. Laser irradiation followed by acid etching produced significantly higher microleakage when compared to the other methods of enamel preparations.
|Advisor:||Stark, Paul C.|
|Commitee:||Aboushala, Ayman, Attar, Moaz H., Loo, Cheen|
|School:||Tufts University School of Dental Medicine|
|School Location:||United States -- Massachusetts|
|Source:||MAI 48/02M, Masters Abstracts International|
|Keywords:||Microleakage, Pits and fissure sealant, Sealant, Self-adhesive|
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