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Journal of Oral Laser Applications

Year 2003
Volume 3 , Issue 2

Pages: 73 - 78

Ultraconservative Ablation in Operative and Esthetic Dentistry

Rosana de Fŕtima Zanirato Lizarelli/Lílian Tan Moriyama/Vanderlei Salvador Bagnato

Purpose: To investigate comparative ablation rate and morphological aspects of different composite resins and dental hard tissues after Er:YAG laser irradiation, with the aim of developing a new clinical technique for the selective removal of restorations and tooth substance. Materials and Methods: We used 11 exfoliated primary anterior and posterior teeth and 6 extracted permanent molars. Three different types of composite resin were chosen (microfilled, hybrid, and condensable) in terms of chemical and structural composition. Composite disks and the teeth were irradiated with an Er:YAG laser under different conditions and energy levels per pulse (100, 200, 300, and 400 mJ). The resulting values were plotted and fitted to allow a comparative observation of the material removed as a function of energy level per pulse. Results: While selective ablation seems to be applicable for the enamel of primary and permanent teeth, it does not apply well to primary or permanent dentin. For dentin, the composition and content of water makes the Er:YAG laser ablation rate equal or superior to that found for the three resins used. Conclusion: The goal of this study, ie, to propose a new clinical technique, was met. It is clear from our results that differential ablation of composite resin restorations using Er:YAG is practicable where enamel surfaces are involved, because their more mineralized composition makes the tissue more resistant to this laser system. Clinically, this new technique presents the Er:YAG laser as an interesting and unique tool in esthetic procedures which also preserves healthy dental hard tissues.


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