Laser & Optoelectronics Progress, Volume. 57, Issue 5, 051402(2020)
Ultra-Fast Laser Milling Technology for VITA MARK II Dental Glass Ceramics
VITA MARK II, a commonly used dental glass ceramic material, is typically milled using a 5-W infrared femtosecond laser. The effects of ultra-fast laser process parameters on milling efficiency and milling effects are systematically studied, and the 20-W infrared femtosecond laser prepared for future test prototype is estimated using the experimental results of 5-W infrared femtosecond laser. The experimental results show that the milling efficiency of the 5-W infrared femtosecond laser on VITA MARK II ceramics is 0.0409 mm 3/s when the laser repetition frequency is 100 kHz, the scanning speed is 200 mm/s, and the scanning interval is 0.01 mm. The roughness of VITA MARK II ceramics treated by femtosecond laser is ranged within 3--5 μm, the margin gap is approximately 50 μm, and the slope quantity is within 100 μm. The laser cutting threshold of VITA MARK II dental glass ceramics is 0.72 J/cm 2. It is estimated that the milling efficiency of 20-W infrared femtosecond laser on VITA MARK II ceramics would be 0.1558 mm 3/s. Therefore, this experiment demonstrates the feasibility and effectiveness of laser cutting dental glass ceramics, providing a reference for the construction of the test prototype.
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Peixin Hu, Lu Yao, Qitao Lü, Encai Ji, Zilin Nie, Zhengdi He. Ultra-Fast Laser Milling Technology for VITA MARK II Dental Glass Ceramics[J]. Laser & Optoelectronics Progress, 2020, 57(5): 051402
Category: Lasers and Laser Optics
Received: Jul. 16, 2019
Accepted: Sep. 6, 2019
Published Online: Mar. 5, 2020
The Author Email: He Zhengdi (1810411003@email.szu.edu.cn)