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

Journals >Laser & Optoelectronics Progress >Volume 57 >Issue 23 >Page 231701 > Article

Laser & Optoelectronics Progress
Vol. 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^*

Author Affiliations

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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DOI: 10.3788/LOP57.231701 Cite this Article Set citation alerts

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 Copy Citation Text

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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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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 1. Er,Cr∶YSGG laser parameters

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 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)	Lattice parameter a/nm		Lattice parameter c/nm
Laser energy density/(J·cm^-2)	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

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

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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