Dental Grinding of Lithium Disilicate Ceramic Prostheses Using High-Speed Rotary Cutting Instruments in In Vitro Oral Adjusting

Abstract:

Oral adjusting of ceramic prostheses involving abrasive machining using dental high-speed rotary cutting instruments is a central process in restorative dentistry, because this process affects not only restorative quality but also patients’ comfort. However, the dental grinding process, especially dental grinding of high-strength ceramic prostheses, is less understood in clinical dentistry. This paper presents dental grinding of an innovative high-strength lithium disilicate ceramic in in vitro oral adjusting regime using a dental high-speed electric handpiece and diamond burs. The dental abrasive machining characteristics were quantitatively evaluated in terms of normal and tangential forces, force ratio, and specific grinding energy as functions of clinically relevant dental grinding variables including depth of cut and feed rate and feed direction of burs. The results showed that the dental tangential and normal forces and specific grinding energy exhibited significant dependences on depth of cut, feed rate and direction of burs, but revealed significantly small scales compared to engineering machining regime. Clinical implication was given that down grinding undoubtedly reduced the abrasive adjusting forces to relieve patients’ discomfort in oral regime. Moreover, dentists must be cautious in dental abrasive adjusting of the lithium disilicate ceramic prostheses at or beyond the specific material removal rate of 2.4 mm³/min due to significantly large forces and vibrations.

• Periodical: Advanced Materials Research (Volume 1136)
• Pages: 36-41
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1136.36
• Online since: January 2016
• Authors: Hai Tao Ren, Xiao Fei Song*, Xiao Feng Zhang
• Keywords: Dental Cutting, Energy, Force, Glass Ceramic, High-Speed Handpiece, Restorative Dentistry, Surface Morphology

References

[1] W. Höland, V. Rheinberger, E. Apel, C. van't Hoen, Principles and phenomena of bioengineering with glass-ceramics for dental restoration, J. Eur. Ceram. Soc. 27 (2007) 1521-1526.

DOI: 10.1016/j.jeurceramsoc.2006.04.101

[2] S. Reich, L. Endres, C. Weber, K. Wiedhahn, P. Neumann, O. Schneider, N. Rafai, S. Wolfart, Three-unit CAD/CAM-generated lithium disilicate FDPs after a mean observation time of 46 months, Clin. oral Invest. 18(2014) 2171-2178.

DOI: 10.1007/s00784-014-1191-8

[3] L. Yin, X.F. Song, Y.L. Song, T. Huang, J. Li, An overview of in vitro abrasive finishing and CAD/CAM of bioceramics in restorative dentistry, Int. J. Mach. Tool Manu. 46 (2006) 1013-1026.

DOI: 10.1016/j.ijmachtools.2005.07.045

[4] S.C. Siegel, J.A. von Fraunhofer, Dental cutting: the historical development of diamond burs. J, Am. Dent. Assoc. 129 (1998) 740-745.

DOI: 10.14219/jada.archive.1998.0316

[5] X.F. Song, J.H. Peng, L. Yin, B. Lin, A Machinging science approach to dental cutting of glass ceramics using an electric handpiece and diamond burs, J. Manuf. Sci. E. -T ASME 135(2013) 011014-6.

DOI: 10.1115/1.4023273

[6] C. Ercoli, M. Rotella, P.D. Funkenbusch, S. Russell, C. Feng, In vitro comparison of the cutting efficiency and temperature production of ten different rotary cutting instruments Part II: electric handpiece and comparison with turbine, J. Prosthet. Dent. 101(2009).

DOI: 10.1016/s0022-3913(09)60064-0

[7] M. Albakry, M. Guazzato, M.V. Swain, Fracture toughness and hardness evaluation of three pressable all-ceramic dental materials, J. Dent. 31(2003) 181-188.

DOI: 10.1016/s0300-5712(03)00025-3

[8] S. Malkin, Grinding Technology: Theory and Applications of Machining with Abrasives, Wiley, New York, (1989).

[9] J.Y. Chen, J.Y. Shen, H. Huang, X.P. Xu, Grinding characteristics in high speed grinding of engineering ceramics with brazed diamond wheels, J. Mater. Process. Tech. 201(2010) 899-906.

DOI: 10.1016/j.jmatprotec.2010.02.002

[10] X.F. Song, L. Yin, J.H. Peng, B. Lin, Cutting characteristics of dental glass ceramics during in vitro dental abrasive adjusting using a high-speed electric handpiece, Ceram. Int. 39 (2013) 6237-6249.

DOI: 10.1016/j.ceramint.2013.01.045

[11] L. Yin, H. Huang, K. Ramesh, T. Huang, High speed versus conventional grinding in high removal rate machining of alumina and alumina-titania. Int. J. Mach. Tools Manufac. 45 (2005) 897-907.

DOI: 10.1016/j.ijmachtools.2004.10.016

[12] T.W. Hwang, C.J. Evans, S. Malkin, Size effect for specific energy in grinding of silicon nitride, Wear 225–229 (1999) 862-867.

DOI: 10.1016/s0043-1648(98)00406-2

[13] S. Malkin, T.W. Hwang, Grinding mechanisms for ceramics, CIRP Ann. Manuf. Techn. 45 (1996) 569-580.

DOI: 10.1016/s0007-8506(07)60511-3

[14] S.C. Siegel, J.A. von Fraunhofer, Effect of handpiece load on the cutting efficiency of dental burs, Mach. Sci. Technol. 1(1997) 1-13.

DOI: 10.1080/10940349708945634