Study on Crystal Structure Change of Laser-Ablated Human Dentin Surface Based on X-Ray Diffraction

Qi Lin; Yu Lin; Yunde Xie; Zhongxiong Ma

doi:10.3788/LOP57.231701

Laser & Optoelectronics Progress, Volume. 57, Issue 23, 231701(2020)

Study on Crystal Structure Change of Laser-Ablated Human Dentin Surface Based on X-Ray Diffraction

Qi Lin, Yu Lin, Yunde Xie, and Zhongxiong Ma^*

Department of Oral Mucosa, the Affiliated Stomatological Hospital, Fujian Medical University, Fujian Key Laboratory of Oral Diseases, Fuzhou, Fujian 350002, China

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Figures & Tables(7)

Fig. 1. XRD pattern of dentin (dash line) and simulated XRD pattern of hydroxyapatite from ICSD-56312 (solid line)

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Fig. 2. XRD patterns of dentin before (dash line) and after (solid line) laser irradiation with different energy densities

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Fig. 3. Crystallographically refined HA crystallite shapes after Er,Cr∶YSGG laser irradiation using Popa model

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Fig. 4. SEM images of dentin before and after laser irradiation (N: dentin before laser irradiation, L: dentin after laser irradiation). (a) Before laser irradiation; (b) after laser irradiation with energy density of 6.18 J/cm²; (c) after laser irradiation with energy density of 8.04 J/cm²; (d) after laser irradiation with energy density of 9.89 J/cm²; (e) after laser irradiation with energy density of 11.1 J/cm²

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Table 1. Er,Cr∶YSGG laser parameters
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Table 1. Er,Cr∶YSGG laser parameters
Pulse frequency /Hz Spot diameter /μm Laser power(machine parameter) /W Laser energy density(experimental parameter) /(J·cm^-2)
20 750 2 6.18
2.5 8.04
3 9.89
3.5 11.1

Table 2. Average particle sizes of HA nanocrystals before and after Er, Cr∶YSGG laser irradiation at (002) and (130) positions

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Table 2. Average particle sizes of HA nanocrystals before and after Er, Cr∶YSGG laser irradiation at (002) and (130) positions

Laser energy density /(J·cm^-2)	(002) axial size/nm		(130) axial size /nm
Laser energy density /(J·cm^-2)	Before	After	Before	After
6.18	32.80±4.9	30.25±4.4	9.41±3.9	8.31±4.2
8.04	25.19±5.2	22.90±5.8	10.85±2.4	8.2±4.1
9.89	32.08±4.7	29.68±4.1	9.53±2.7	7.58±3.5
11.1	27.70±4.5	22.60±6.0	10.12±2.6	9.13±2.9

Table 3. Lattice parameters of nano HA in dentin before and after Er,Cr∶YSGG laser irradiation
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Table 3. Lattice parameters of nano HA in dentin before and after Er,Cr∶YSGG laser irradiation
Laser energy density/(J·cm^-2) Lattice parameter a/nm Lattice parameter c/nm
Before After Before After
6.18 0.945 0.944 0.688 0.689
8.04 0.944 0.943 0.688 0.688
9.89 0.944 0.945 0.688 0.689
11.1 0.945 0.944 0.688 0.689

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Qi Lin, Yu Lin, Yunde Xie, Zhongxiong Ma. Study on Crystal Structure Change of Laser-Ablated Human Dentin Surface Based on X-Ray Diffraction[J]. Laser & Optoelectronics Progress, 2020, 57(23): 231701

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Paper Information

Category: Medical Optics and Biotechnology

Received: May. 6, 2020

Accepted: May. 20, 2020

Published Online: Dec. 8, 2020

The Author Email: Zhongxiong Ma (372590301@qq.com)

DOI:10.3788/LOP57.231701

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Er,Cr∶YSGG laser parameters

Table 1. Er,Cr∶YSGG laser parameters

Table 2. Average particle sizes of HA nanocrystals before and after Er, Cr∶YSGG laser irradiation at (002) and (130) positions

Table 2. Average particle sizes of HA nanocrystals before and after Er, Cr∶YSGG laser irradiation at (002) and (130) positions

Table 3. Lattice parameters of nano HA in dentin before and after Er,Cr∶YSGG laser irradiation

Table 3. Lattice parameters of nano HA in dentin before and after Er,Cr∶YSGG laser irradiation