Open AccessThe surface denaturation analysis of lithium disilicate glass ceramics milled by ultraviolet picosecond laser
Author(s) -
Pu-Zhou Hu,
Lu Yao,
Qitao Lue,
Encai Ji,
Zilin Nie,
Zhengdi He
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1549/3/032150
Subject(s) - materials science , laser , ceramic , galvanometer , composite material , ultraviolet , layer (electronics) , optics , optoelectronics , physics
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.