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学科主题: 口腔医学
题名:
Method to control depth error when ablating human dentin with numerically controlled picosecond laser: a preliminary study
作者: Sun, Yuchun1,2,3,4; Yuan, Fusong1,2,3,4; Lv, Peijun1,2,3,4; Wang, Dangxiao5; Wang, Lei5; Wang, Yong1,2,3,4
关键词: Picosecond laser ; Numerically controlled ablation ; Dentin ; Ablation depth ; Error control
刊名: LASERS IN MEDICAL SCIENCE
发表日期: 2015-07-01
DOI: 10.1007/s10103-014-1596-2
卷: 30, 期:5, 页:1435-1441
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Engineering, Biomedical ; Surgery
研究领域[WOS]: Engineering ; Surgery
关键词[WOS]: ENAMEL ; NANOSECOND ; PULSES
英文摘要:

A three-axis numerically controlled picosecond laser was used to ablate dentin to investigate the quantitative relationships among the number of additive pulse layers in two-dimensional scans starting from the focal plane, step size along the normal of the focal plane (focal plane normal), and ablation depth error. A method to control the ablation depth error, suitable to control stepping along the focal plane normal, was preliminarily established. Twenty-four freshly removed mandibular first molars were cut transversely along the long axis of the crown and prepared as 48 tooth sample slices with approximately flat surfaces. Forty-two slices were used in the first section. The picosecond laser was 1,064 nm in wavelength, 3 W in power, and 10 kHz in repetition frequency. For a varying number (n = 5-70) of focal plane additive pulse layers (14 groups, three repetitions each), two-dimensional scanning and ablation were performed on the dentin regions of the tooth sample slices, which were fixed on the focal plane. The ablation depth, d, was measured, and the quantitative function between n and d was established. Six slices were used in the second section. The function was used to calculate and set the timing of stepwise increments, and the single-step size along the focal plane normal was d micrometer after ablation of n layers (n = 5-50; 10 groups, six repetitions each). Each sample underwent three-dimensional scanning and ablation to produce 2 x 2-mm square cavities. The difference, e, between the measured cavity depth and theoretical value was calculated, along with the difference, e (1), between the measured average ablation depth of a single-step along the focal plane normal and theoretical value. Values of n and d corresponding to the minimum values of e and e (1), respectively, were obtained. In two-dimensional ablation, d was largest (720.61 mu m) when n = 65 and smallest when n = 5 (45.00 mu m). Linear regression yielded the quantitative relationship: d = 10.547 x n -aEuro parts per thousand 7.5465 (R (2) = 0.9796). During three-dimensional ablation, e (1) was the smallest (0.02 mu m) when n = 5 and d = 45.00 mu m. The depth error was 1.91 mu m when 450.00-mu m depth cavities were produced. When ablating dentin with a three-axis picosecond laser scan-ablation device (450 mu m, 3 W, 10 kHz), the number of focal plane additive pulse layers and step size along the focal plane normal was positively correlated with the single-layer and total ablation depth errors. By adjusting the timing of stepwise increments along the focal plane normal and single-step size when ablating dentin by using the numerically controlled picosecond laser, the single-step ablation depth error could be controlled at the micrometer level.

语种: 英语
所属项目编号: 2012BAI07B04 ; 81271181
项目资助者: National Science &amp ; Technology Pillar Program ; National Natural Science Foundation of China
WOS记录号: WOS:000356531400003
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/50806
Appears in Collections:北京大学口腔医学院_期刊论文

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作者单位: 1.Beihang Univ, Inst Robot, Beijing 100191, Peoples R China
2.Peking Univ, Ctr Digital Dent, Sch & Hosp Stomatol, Beijing 100081, Peoples R China
3.Peking Univ, Fac Prosthodont, Sch & Hosp Stomatol, Beijing 100081, Peoples R China
4.Natl Engn Lab Digital & Mat Technol Stomatol, Beijing 100081, Peoples R China
5.Minist Hlth, Res Ctr Engn & Technol Digital Dent, Beijing 100081, Peoples R China

Recommended Citation:
Sun, Yuchun,Yuan, Fusong,Lv, Peijun,et al. Method to control depth error when ablating human dentin with numerically controlled picosecond laser: a preliminary study[J]. LASERS IN MEDICAL SCIENCE,2015,30(5):1435-1441.
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