Relationship between Er,Cr:YSGG laser power and surface roughness of lased radicular dentin.

Zohre Sadat Hosseinipour,Sima Shahabi,Maryam Pirmoradian-Najafabadi

doi:10.15171/joddd.2018.013

Zohre Sadat Hosseinipour, Sima Shahabi + Show 1 more

Open Access

https://doi.org/10.15171/joddd.2018.013

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Abstract

Background: This study sought to assess the effect of Er,Cr:YSGG laser power on the surface roughness of lased radicular dentin using atomic force microscopy (AFM). Methods: Fifteen human radicular dentin samples were randomly divided into five groups: one control (G1, intact) and four experimental groups treated with 0.25W (G2), 0.5W (G3), 0.75W (G4) and 1W (G5) powers of Er,Cr:YSGG laser (2.78µm) at a repetition rate of 20 Hz, with a 600-µm-diameter sapphire tip. After irradiation, surface topography was analyzed by AFM using a Si probe in tapping mode. Quantitative information concerning the arithmetic average roughness (Ra) and quadratic mean roughness (Rq) was obtained from three 5×5µm areas of each sample. The data were analyzed using one-way ANOVA (P<0.05). Results: The Ra and Rq values increased in G2 and G5 and decreased in G3 and G4 groups compared to the control group. The maximum Ra and Rq values were noted in G5, which were significantly higher than the corresponding values in G3 (P<0.05). Conclusion: No direct correlation was found between Er,Cr:YSGG laser power and surface roughness of lased radicular dentin. Laser therapy with a mean power of 0.5W and 1W caused the lowest and highest surface roughness, respectively.

Highlights

Implemented caries preventive measures such as the extensive marketing of fluoride-containing products and water fluoridation as well as advances in conservative restorative procedures have resulted in a reduction in the prevalence of caries among children and young adults and in increased number of natural teeth present in the oral cavity of the elderly.[1]
Fifteen human radicular dentin samples were randomly assigned to five groups: one control (G1, intact) and four experimental groups treated with 0.25-W (G2), 0.5-W (G3), 0.75-W (G4) and 1-W (G5) powers of Er,Cr:YSGG laser (2780 nm, 20 Hz, sapphire tip with 600-μm-diameter)
No direct correlation was found between Er,Cr:YSGG laser power and surface roughness of lased radicular dentin

Summary

Introduction

Implemented caries preventive measures such as the extensive marketing of fluoride-containing products and water fluoridation as well as advances in conservative restorative procedures have resulted in a reduction in the prevalence of caries among children and young adults and in increased number of natural teeth present in the oral cavity of the elderly.[1]. Recent studies support the efficacy of lasers for prevention of demineralization of tooth structures, when sub-ablative laser parameters are applied.[9] For this purpose, erbium lasers can be used. Erbium lasers are not suitable for removal or ablation of mineralized tissues; rather, they can be used to change the dentin structure to confer resistance to demineralization and caries.[10,11] Changes in tooth composition occur at 100‒1200°C.12. Knowledge about the impact of this type of laser in different powers on radicular dentin can greatly help in selection of the most ideal laser power to minimize surface roughness in lased dentin. This study sought to assess the effect of Er,Cr:YSGG laser power on surface roughness of lased radicular dentin using atomic force microscopy (AFM)

Methods

Results

Conclusion