Tensile bond strength of sealants following Er:YAG laser etching compared to acid etching in permanent teeth

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...

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Bibliographic Details
Published in:	Lasers in medical science Vol. 27; no. 2; pp. 371 - 375
Main Authors:	Shahabi, Sima, Bagheri, Hossein G., Ramazani, Kosar
Format:	Journal Article
Language:	English
Published:	London Springer-Verlag 01-03-2012 Springer Nature B.V
Subjects:	Acid Etching, Dental - instrumentation Bond strength Dental Enamel - drug effects Dental Enamel - radiation effects Dental Materials - chemistry Dentistry Dentition, Permanent Humans In Vitro Techniques Laser etching Lasers Lasers, Solid-State Medicine Medicine & Public Health Molar, Third - drug effects Molar, Third - radiation effects Optical Devices Optics Original Article Phosphoric Acids - pharmacology Photonics Pit and Fissure Sealants - pharmacology Pit and Fissure Sealants - radiation effects Quantum Optics Resins, Synthetic - radiation effects Sealing compounds Teeth Tensile strength Tensile Strength - drug effects Tensile Strength - radiation effects Sealant Permanent teeth Er:YAG laser Tensile bond strength
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0268-8921 1435-604X
DOI:	10.1007/s10103-010-0869-7