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Title: Topographical characteristics of enamel and dentin after ER:YAG laser ablation versus phosphoric acid etching
Author(s): Dr. ALAA M. EL-ARABY, Dr. AHMED AL-HEJAZI
Source: Saudi Dental Journal 2006;18(SI)-Abstr.088,

Abstract: 'The Er:YAG laser has been reported a promising therapeutic tool capable of removing dental hard tissues for minimally invasive dentistry/Micro-Dentistry techniques. Previous studies with different types of lasers have shown that it is possible to effectively increase the mechanical and chemical resistance of dental enamel in order to achieve prevention against dental caries. Nevertheless, conditioning tooth structure with phosphoric acid is required to achieve good bonding to composite and other adhesive restorations. Some manufacturers of laser tools claimed that pain free preparation and filling methods without using acid etching could be possible by ablation tooth structure with Er:YAG laser. Several researchers reported the surface of laser irradiated enamel and dentine looks very similar to the surfaces after acid etching. The aim of this study is to analyze the surface morphology of enamel and dentin after laser irradiation and compare it to that etched with phosphoric acid. Nine freshly extracted premolars stored in saline solution were used in this study. The specimens were divided into three groups. Group 1, the cut surfaces were irradiated with Enlaser at 200 mJ, 10Hz in SP mode. Group 2, the cut surfaces were conditioned with phosphoric acid gel. Group 3, the laser irradiated surfaces were then conditioned with phosphoric acid gel. Topographical analysis to enamel and dentin was investigated by SEM and energy-dispersive X-ray analysis (EDX). SEM observation of the lased enamel showed that the lased areas were seemed to be thermally evaporated and vitrified. It revealed a rough topography and scale-like appearance with some porosites at high magnification. SEM observation on lased dentin revealed rough surface topography. Dentinal tubules are partially exposed or closed in some areas. Dentin is covered with debris and partially evaporated smear-layer with some areas are vitrified. It is concluded that phosphoric acid etching is essential for surface modification even after laser irradiation.'..

Addresses: 'College of Dentistry, King Saud University, Riyadh, Saudi Arabia'..

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Country Code: SA