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Microstructure and mechanical changes induced by Q-Switched pulse laser on human enamel with aim of caries prevention

Apsari, R. and Pratomo, D. A. and Hikmawati, D. and Bidin, N. (2016) Microstructure and mechanical changes induced by Q-Switched pulse laser on human enamel with aim of caries prevention. In: 5th International Conference and Workshop on Basic and Applied Sciences, ICOWOBAS 2015, 16-17 Oct 2015, Surabaya, Indonesia.

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Abstract

This study was conducted to determine the effect of Q-Switched Nd: YAG laser energy dose to human enamel caries. The specifications of Q-Switched Nd: YAG laser as followed: wavelength of 1064?nm and 6?ns pulse width. Caries enamel samples taken from human teeth molars of 17-35 ages and the type of media caries. Energy doses used in this study were 723.65 mJ/cm2, 767.72 mJ/cm2, and 1065.515 mJ/cm2; 5 Hz repetition rate, and 20 second exposure time. Samples characterized the surface morphology and the percentage of constituent elements, especially calcium/phosphorus (Ca/P) with FESEM-EDAX. The fraction volume and crystallinity percentage of hydroxyapatite (HA) with XRD and hardness value using Vickers Microhardness Test. The results indicated that exposure of Q-Switched Nd:YAG laser on enamel caries resulting cracks, holes, and melt due to plasma production effects in the surface. Plasma production effect also resulted in micro properties such as percentage of Ca/P was close to normal, the fraction volume and crystallinity percentage of HA went up but did not change the crystal structure (in terms of the lattice structure). The hardness value also rose as linear as exposure energy dose caused by phototermal effect. Based on the results, Q-Switched Nd:YAG laser can be used as contactless drill dental caries replacement candidate with the additional therapy effect such as localized caries in order to avoid the spread, the ratio of Ca/P approaching healthy teeth, the fraction volume and crystallinity percentage of HA rose and established stronger teeth with peak energy dose 1065.515 mJ/cm2.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Nd:YAG laser, Photoablation, Photothermal, Plasma Production
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:73360
Deposited By: Mohd Zulaihi Zainudin
Deposited On:21 Nov 2017 11:28
Last Modified:21 Nov 2017 11:28

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