Tensile bond strength of sealants following Er:YAG laser etching compared to acid etching in permanent teeth
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Sima Shahabi & Hossein G. Bagheri & Kosar Ramazani
- چاپ و سال / کشور: 2010
Description
The aim of this in vitro study was to assess the effect of Er:YAG laser surface treatment on the tensile bond strength of a sealant in permanent teeth. A total of 30 sound third molars were selected and embedded in cold-cure acrylic resin. The enamel surfaces were flattened by a grinding. The teeth were randomly divided into three groups and pretreated as follows: (1) 37% phosphoric acid; (2) Er:YAG laser (1.5 ml/min water spray, 100 mJ energy output, 10 Hz frequency, focal distance 17 mm); (3) Er: YAG laser + 37% phosphoric acid. The treated surfaces were isolated by double adhesive Sellotape and after insertion of a split Teflon matrix at an isolated site, sealant was applied. The specimens were thermocycled and stored at 37°C in distilled water for 72 h, then subjected to a tensile bond strength test (50 kgf at 0.5 mm/min). The mean tensile bond strengths (±SD, in megapascals) were: 18.51 ±5.68 in group 1, 8.06±2.69 in group 2, and 17.33±5.04 in group 3. Data were submitted to analysis of variance and the Tukey test. No significant difference were found between groups 1 (37% phosphoric acid) and group 3 (Er: YAG laser + 37% phosphoric acid) but treatment with the Er: YAG laser alone (group 2) resulted in significantly lower tensile bond strength than seen in the other groups. In this setting, the Er:YAG laser prepared the enamel surface for sealing but did not eliminate the need for acid etching before sealant application.
Lasers Med Sci DOI 10.1007/s10103-010-0869-7 Received: 22 June 2010 / Accepted: 30 November 2010
