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Proceedings Paper

Microleakage in class V composite resin restorations treated with CO2 laser: an in-vitro study
Author(s): Andrea Naddeo Lopes da Cruz; Narciso Garone Netto; Adriana Fruges Pagliari; Juliana Matson; Ricardo Scarparo Navarro; Carlos de Paula Eduardo; Denise Maria Zezell
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Paper Abstract

Various materials and techniques have been investigated in order to minimize or eliminate microleakage in composite restorations. The CO2 laser (10.6 micrometer) removes the smear layer and creates an irregular surface able to promote micromechanical retention for adhesive restorative materials. Forty Class V cavities were performed with high-speed drill in 20 extracted human molar and randomly divided into 4 different groups: Group 1 -- CO2 laser (3 W, 2 Hz, 50 ms) and after 37% phosphoric acid etching on dentin and enamel surface; Group 2 -- 37% phosphoric acid etching and after CO2 laser; Group 3 -- CO2 laser; Group 4 -- 37% phosphoric acid etching. The cavity restored with composite resin (Z-100) and thermally stressed (700 cycles, 5 - 55 degree Celsius). After the samples were impermeabilized, immersed in 50% silver nitrate solution for 8 hours and sectioned with Isomet saw. The teeth were exposed to Photoflood light (G.E.) for 5 minutes to reveal the dye. Leakage was observed under stereomicroscope and evaluated with scores. Results were analyzed with ANOVA (p greater than 1%) and Tukey's test (p equals 5%) and showed significant lower microleakage in the group treated only with CO2 laser and phosphoric acid etching alone (group 3 and 4) than groups treated with phosphoric acid and CO2 laser together (group 1 and 2).

Paper Details

Date Published: 24 March 2000
PDF: 6 pages
Proc. SPIE 3910, Lasers in Dentistry VI, (24 March 2000); doi: 10.1117/12.380846
Show Author Affiliations
Andrea Naddeo Lopes da Cruz, Univ. de Sao Paulo and Univ. Cidade de Sao Paulo (Brazil)
Narciso Garone Netto, Univ. de Sao Paulo and Univ. Cidade de Sao Paulo (Brazil)
Adriana Fruges Pagliari, Univ. de Sao Paulo (Brazil)
Juliana Matson, Univ. Cidade de Sao Paulo (Brazil)
Ricardo Scarparo Navarro, Univ. de Sao Paulo (Brazil)
Carlos de Paula Eduardo, Univ. de Sao Paulo (Brazil)
Denise Maria Zezell, Instituto de Pesquisas Energeticas e Nucleares (Brazil)


Published in SPIE Proceedings Vol. 3910:
Lasers in Dentistry VI
John D. B. Featherstone; Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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