Ultrasonic assisted high rotational speed diamond machining of dental glass ceramics

• Published in: International journal of advanced manufacturing technology 2018-04, Vol.96 (1-4), p.387-399
• Main Authors: Song, Xiao-Fei, Yang, Jia-Jun, Ren, Hai-Tao, Lin, Bin, Nakanishi, Yoshitaka, Yin, Ling
• Format: Article
• Language: English
• Subjects: Abrasive machining; CAE) and Design; Ceramics; Chipping; Computer-Aided Engineering (CAD; Cutting speed; Damage assessment; Diamond machining; Engineering; Force measurement; Glass ceramics; High speed; Industrial and Production Engineering; Mechanical Engineering; Media Management; Original Article; Rapid prototyping; Surface properties; Surface roughness; Ultrasonic machining; Ultrasonic vibration; Vibration measurement
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-017-1571-8

Subsurface damage and edge chipping remain a persistent technical challenge for the abrasive machining of dental restorations made from glass ceramics, and they impede the fabrication of long-lasting dental restorations. This paper reports on an integration of ultrasonic assistance to dental high-speed rotary abrasive machining for improvement of the surface quality of glass ceramics. An ultrasonic assisted computer-controlled high-speed rotary cutting apparatus was designed and fabricated with functions of ultrasonic vibration, automatic cutting, and force measurement. A multi-phase feldspar glass ceramic with the highest brittleness among glass ceramics was selected for the study. Machining forces, surface roughnesses, and edge chipping damage were evaluated for a range of cutting conditions with and without ultrasonic vibrations. Our most significant finding is that ultrasonic assisted machining led to a clear and consistent reduction of edge chipping and thus subsurface damage. Ultrasonic machining also achieved significant reductions in normal and tangential forces, and surface roughness at higher removal rates ( p