Machinability of lithium disilicate glass ceramic in in vitro dental diamond bur adjusting process

Journal of the Mechanical Behavior of Biomedical Materials
Xiao-Fei SongLing Yin

Abstract

Esthetic high-strength lithium disilicate glass ceramics (LDGC) are used for monolithic crowns and bridges produced in dental CAD/CAM and oral adjusting processes, which machinability affects the restorative quality. A machinability study has been made in the simulated oral clinical machining of LDGC with a dental handpiece and diamond burs, regarding the diamond tool wear and chip control, machining forces and energy, surface finish and integrity. Machining forces, speeds and energy in in vitro dental adjusting of LDGC were measured by a high-speed data acquisition and force sensor system. Machined LDGC surfaces were assessed using three-dimensional non-contact chromatic confocal optical profilometry and scanning electron microscopy (SEM). Diamond bur morphology and LDGC chip shapes were also examined using SEM. Minimum tool wear but significant LDGC chip accumulations were found. Machining forces and energy significantly depended on machining conditions (p<0.05) and were significantly higher than other glass ceramics (p<0.05). Machining speeds dropped more rapidly with increased removal rates than other glass ceramics (p<0.05). Two material machinability indices associated with the hardness, Young's modulus and fracture tough...Continue Reading

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Citations

Jun 28, 2016·The Journal of the American Dental Association·Sharon C Siegel, Tejas Patel
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Aug 29, 2021·Journal of Materials Science. Materials in Medicine·Larissa Natiele MiottoLígia Antunes Pereira Pinelli

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