A machining science approach to dental cutting of glass ceramics using an electric handpiece and diamond burs

Song, Xiao-Fei, Peng, Jian-Hui, Yin, Ling, and Lin, Bin (2013) A machining science approach to dental cutting of glass ceramics using an electric handpiece and diamond burs. Journal of Manufacturing Science and Engineering, 135 (1). 011014. pp. 1-6.

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Dental cutting using handpieces has been the art of dentists in restorative dentistry. This paper reports on the scientific approach of dental cutting of two dental ceramics using a high-speed electric handpiece and coarse diamond burs in simulated clinical conditions. Cutting characteristics (forces, force ratios, specific removal energy, surface roughness, and morphology) of feldspar and leucite glass ceramics were investigated as functions of the specific material removal rate, Qw and the maximum undeformed chip thickness, hmax. The results show that up and down cutting remarkably affected cutting forces, force ratios, and specific cutting energy but did not affect surface roughness and morphology. Down cutting resulted in much lower tangential and normal forces, and specific cutting energy, but higher force ratios. The cutting forces increased with the Qw and hmax while the specific cutting energy decreased with the Qw and hmax. The force ratios and surface roughness showed no correlations with the Qw and hmax. Surface morphology indicates that the machined surfaces contained plastically flowed and brittle fracture regions at any Qw and hmax. Better surface quality was achieved at the lower Qw and the smaller hmax. These results provide fundamental data and a scientific understanding of ceramic cutting using electric dental handpieces in dental practice.

Item ID: 32311
Item Type: Article (Research - C1)
ISSN: 1528-8935
Keywords: dental cutting; glass ceramics; electric handpiece; force; energy; surface roughness; morphology
Funders: National Natural Science Foundation of China (NNSF), Specialized Research Fund for the Doctoral Program of Higher Education, China (SRF)
Projects and Grants: NNSF Grant 50905124, SRF Grant No. 20090032120011
Date Deposited: 22 Apr 2014 23:49
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1105 Dentistry > 110501 Dental Materials and Equipment @ 50%
09 ENGINEERING > 0903 Biomedical Engineering > 090302 Biomechanical Engineering @ 50%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 100%
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