The surface denaturation analysis of lithium disilicate glass ceramics milled by ultraviolet picosecond laser

Dental glass ceramic has good optical properties and biological compatibility. This material has been widely used in the field of the porcelain restoration. Because the shape of the missing tooth varies from patient to patient, dental restoration need to be personalized. Traditional CAD/CAM milling...

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Bibliographic Details
Published in:Journal of physics. Conference series 2020-06, Vol.1549 (3), p.32150
Main Authors: Hu, Peixin, Yao, Lu, Lue, Qitao, Ji, Encai, Nie, Zilin, He, Zhengdi
Format: Article
Language:English
Subjects:
Biological properties
CAD/CAM
Ceramics
Composition
Cracks
Cutting parameters
Denaturation
Dental materials
Galvanometers
Glass ceramics
Laser beam cutting
Laser machining
Lasers
Lithium
Optical properties
Porcelain
Ultrafast lasers
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Summary:Dental glass ceramic has good optical properties and biological compatibility. This material has been widely used in the field of the porcelain restoration. Because the shape of the missing tooth varies from patient to patient, dental restoration need to be personalized. Traditional CAD/CAM milling cutter method has problems of high wear cost, low processing efficiency, general processing accuracy. In this study, a 30W ultraviolet picosecond laser was used to mill lithium disilicate glass ceramics. The transparent recoagulation layer and cracks were formed in the condition of some special laser parameters. X-ray diffraction (XRD) material composition test showed that the main composition of the transparent recoagulation layer was not changed. The surface denaturation of different laser cutting parameters were analyzed. The experimental results showed that whether the transparent recoagulation layer generated is the comprehensive result of the laser parameters which contains output power, repetition frequency and scanning speed of galvanometer. The reasons of the transparent recoagulation layer and cracks produced by laser were discussed. By optimizing the laser parameters, the formation of transparent recoagulation layer and cracks can be avoid. The test laid a good experimental foundation for the ultrafast laser milling dental glass ceramics equipment.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1549/3/032150