Variation on Molecular Structure, Crystallinity, and Optical Properties of Dentin Due to Nd:YAG Laser and Fluoride Aimed at Tooth Erosion Prevention.

Daísa Pereira,Luciano Bachmann,Patricia Ana,Carolina Benetti,Denise Zezell,Anderson Freitas

doi:10.3390/ijms19020433

Abstract

This in vitro study evaluated the compositional, crystalline, and morphological effects promoted by Nd:YAG laser on root dentin, and verified the effects of laser and topical acidulated phosphate fluoride application (APF-gel) on dentin erosion. 180 bovine dentin slabs were randomized into 4 groups (n = 45): G1–untreated, G2–APF-gel (1.23% F−, 4 min), G3–Nd:YAG (1064 nm, 84.9 J/cm2, 10 Hz), and G4–APF-gel application followed by Nd:YAG laser irradiation. The compositional, crystalline, and morphological effects promoted by treatments were investigated on five samples of each experimental group. The other samples were submitted to a 5-day, 10-day, or 15-day erosive and abrasive demineralization and remineralization cycling in order to create erosion lesions. The area and depth of lesions, as well as the optical attenuation coefficient, were assessed, and all data were statistically analysed (p < 0.05). Nd:YAG laser promoted the reduction of carbonate, the formation of tetracalcium phosphate, as well as the melting and recrystallization of the dentin surface. Laser significantly decreased the area and depth of erosion lesions and altered the optical attenuation coefficient when compared to untreated and APF-gel groups, but the association of APF-gel and laser did not promote an additional effect. Nd:YAG laser irradiation can be a promissory treatment to prevent dentin erosion and the abrasion process.

Highlights

Dental erosion is an oral demineralization process whose prevalence has increased significantly [1,2,3,4].In a simplified form, it is an irreversible loss of enamel and/or dentin caused by extrinsic or intrinsic acids in the absence of biofilm [5]
Infrared high-intensity laser irradiation is a widely suggested alternative for preventing enamel caries, there are few studies that relate the preventive effects for erosion lesions [22,23,24,25,26]
Enamel caries, there are few studies that relate the preventive effects for erosion lesions the results of these studies are controversial, since different laser wavelengths and erosive conditions the results ofliterature these studies sincelaser different laser wavelengths erosive were

Summary

Introduction

Dental erosion is an oral demineralization process whose prevalence has increased significantly [1,2,3,4].In a simplified form, it is an irreversible loss of enamel and/or dentin caused by extrinsic or intrinsic acids in the absence of biofilm [5].

Methods

Results

Conclusion