基于X射线衍射的激光消融改变人牙本质表层晶体结构的研究 
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Study on Crystal Structure Change of Laser-Ablated Human Dentin Surface Based on X-Ray Diffraction
福建医科大学附属口腔医院口腔黏膜科, 福建省口腔疾病重点实验室, 福建 福州 350002
图 & 表
图 1. 牙本质XRD谱图(虚线)及HA(ICSD-56312)的标准谱图(实线)
Fig. 1. XRD pattern of dentin (dash line) and simulated XRD pattern of hydroxyapatite from ICSD-56312 (solid line)
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图 2. 不同能量密度的激光照射前后牙本质的XRD谱图(虚线:激光辐照前;实线:激光辐照后)
Fig. 2. XRD patterns of dentin before (dash line) and after (solid line) laser irradiation with different energy densities
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图 3. Popa模型拟合得到的激光照射后牙本质中纳米HA颗粒的形貌
Fig. 3. Crystallographically refined HA crystallite shapes after Er,Cr∶YSGG laser irradiation using Popa model
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图 4. 激光辐照前后牙本质的SEM图像(N代表未经激光辐照的牙本质,L代表激光辐照后的牙本质)。(a) 激光照射前;(b) 6.18 J/cm2激光照射后;(c) 8.04 J/cm2激光照射后;(d) 9.89 J/cm2激光照射后;(e) 11.1 J/cm2激光照射后
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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表 1Er,Cr∶YSGG激光参数
Table1. 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 |
|
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表 2激光照射前后牙本质HA纳米颗粒(002)和(130)轴向尺寸
Table2. 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 |
|---|
| 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 |
|
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表 3激光照射前后牙本质中纳米HA的晶胞参数
Table3. 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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林琪, 林昱, 谢云德, 马忠雄. 基于X射线衍射的激光消融改变人牙本质表层晶体结构的研究[J]. 激光与光电子学进展, 2020, 57(23): 231701. 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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