Research Information System
Turk Prosthodonti Implantoloji derneği 2023 kongresi, Antalya, Turkey, 8 - 12 November 2023, pp.1-4, (Summary Text)
In vivo Evaluation of the Hybrid Layer of Er-YAG Laser Irradiated and Acid Etched Dentin
Purpose: The objective of this in vivo study was to evaluate the morphological and mechanical properties of laser-etched and acid etched dentin bonded with an etch-and-rinse adhesive over 9 months period of time.
Material and Methods: Class I cavities (3 x 3 x 4 mm) with continuous enamel cavosurface margins were prepared using a diamond bur in a high speed handpiece with copious water spray while the individuals were under local anesthesia. The control cavities were etched with 35% phosphoric acid (Etchant gel, Prime Dental, Chicago, IL, USA) for 15 sec, rinsed with air/water spray for 30 sec. The contralateral experimental cavities was treated by Er:YAG laser irradiation (Lightwalker, Fotona; Ljubljana, Slovenia) at a 2.94-μm wave-length for 15 sec using a contact hand piece of the laser device (H14, Fotona d.d.) and a sapphire tip of 1.3 mm in diameter and 8 mm in length. The output settings were 120 mJ, 10 Hz, 1.2 W and the pulse duration was 100 μs. Air and water cooling was used during laser irradiation. Right after this phase, the adhesive bonding (AdperTM Single Bond 2, 3M ESPE) and composites (FiltekTM Ultimate, 3M ESPE-FiltekTM Z550, 3M ESPE) was applied on dentin. The individuals were periodically called for controls and had their treated teeth extracted (10 pairs) 9 months later. All restorations were intact, asymptomatic and had no signs of recurrent caries. All extracted teeth were stored immediately in 0.9% NaCl containing 0.02% NaN3 at 4 ºC to inhibit microbial growth. Each tooth was analyzed by SEM for evaluation of the hybrid layer.
Results: SEM observation suggested that laser treated dentine has similar hybrid layer compared with acid etched dentine. Acid etched dentine surfaces has more obvious resin tags than laser treated dentine.
Conclusion: It may be concluded that laser treatment of dentinal surfaces negatively affects the hybrid layer when compared to acid etching. Contradictions still remains regarding the most effective way of accomplishing adhesion on Er:YAG laser-irradiated surfaces.