A comparative leakage study on Er,Cr:YSGG laser- and bur- prepared Class V cavities restored with a low-shrinkage composite using different filling techniques|
Strohmayer Sarabia, Fernanda; Dias Neves Lago, Andréa; Brossi Botta, Sérgio; Soares de Azevedo, Cynthia; Garone-Netto, Narciso & Bona Matos, Adriana
Aim: To evaluate the leakage on Er,Cr:YSGG laser- and bur- prepared Class V cavities restored
with a silorane-based composite resin using different insertion techniques.
Methods: 40 cavities
were outlined according to: the type of instrument [Er,Cr:YSGG laser (3.0 W power, energy per
pulse of 150 mJ, fluence of 53.57J/cm2, pulse duration of 140-200 μs, 20 Hz repetition rate and
55/65% air/water spray) or diamond bur]; and the type of filling technique (bulk increment or
incremental). Four experimental groups were obtained (n=10): G1- diamond bur (DB) and
incremental (I); G2- DB and bulk increment (BI); G3- Er,Cr:YSGG and I; and G4- Er,Cr:YSGG
and BI. Specimens were restored with a silorane-based composite resin (Filtek P90, 3M/ESPE),
subjected to 500 thermal cycles, sealed, infiltrated with 2% (w/v) methylene blue and sectioned in
halves. Specimen analysis was scored based on a scale. Statistical analyses were done using
the Kruskal-Wallis and Student Newman-Keuls tests (α=0.05).
Results: Statistically significant
differences were observed between G2 and G4 (p=0.003) and between G1 and G2 (p=0.028).
The filling technique did not influence the pattern of dye leakage in the cavity walls (p=0.151).
Conclusions: Less leakage was observed when Er,Cr:YSGG cavities were restored with
silorane-based composite resin, using the bulk increment technique. Nevertheless, cavities done
using diamond bur have less leakage only when incrementally restored.
dental leakage, lasers, polymerization, composite resins, tooth preparation