Effect of Er:YAG Laser on Interface of Dentin and Universal Adhesive

doi:10.13701/j.cnki.kqyxyj.2021.10.017

Abstract

Abstract: Objective: To observe the characteristics of resin/dentin interface between dentine pretreated by Er:YAG laser and universal adhesive with self-etching or etch-and-rinse mode, and to explore the differences between two bonding mechanisms through comparing with traditional treated dentine bonding interface. Methods: Thirty-six intact human third molars were selected and randomly divided into four groups (group A: control + self-etching; group B: control + 35% phosphoric acid etching; group C: Er:YAG laser + self-etching; group D: Er:YAG laser+ 35% phosphoric acid etching). Nine teeth in each group were divided into three groups, which were prepared dentin disk in the thickness of 3mm and longitudinal cross-section of resin-dentin interface and resin-dentin transparent grinding plates in the thickness of 2mm. The interface observation and mass fraction analysis of calcium (Ca) and phosphorus (P) on dentine surface were carried out by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The length and number of resin tags were observed by laser confocal scanning microscope (CLSM). Results: SEM and EDX analysis showed that the surface of dentine was changed by Er:YAG laser pretreatment, and the mass fraction of Ca was increased. The bonding interface of group C showed a high density hybrid layer with similar thickness to that of group B and D. High density layer could be seen at the bonding interface of group A, B, and D. The length and number of resin tags in group C were higher than those in group A. Conclusion: In the self-etching mode, the dentine pretreated by Er:YAG laser and the universal adhesive formed a special hybrid layer with high density, which increased the length and number of resin tags.

Key words: Er:YAG laser, dentin, universal adhesive, resin-dentin interface

LI Zhenjie, ZHOU Boyang, HAO Pengjie. Effect of Er:YAG Laser on Interface of Dentin and Universal Adhesive[J]. Journal of Oral Science Research, 2021, 37(10): 940-944.

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