Machining of brittle materials has traditionally been slow, expensive, and prone to creating surface damage, decreasing strength and service lifetime. The objective of this project is to (1) enhance the machinability of dental ceramics in terms of both increasing the rate of material removal and decreasing the damage incurred during machining and further to (2) via chemical tempering, increase clinical success by increasing strength and fatigue life while decreasing wear. Two novel machining concepts will be explored to create these enhancements; machining in a chemically active high-temperature bath and machining with in-situ chemical tempering.
Four specific aims will be investigated: (1) investigate high-temperature machining to increase the efficiency of machining, (2) tailor chemical reactions during machining in a high- temperature salt bath to promote high material removal rates with low surface damage, (3) determine the effect of selected chemical tempering methods on surface integrity, fatigue strength, and wear in conjunction with Projects 1, 2, and 3, and (4) incorporate chemical tempering and high-temperature machining into a single process.
| Yin, Ling (2012) Property-process relations in simulated clinical abrasive adjusting of dental ceramics. J Mech Behav Biomed Mater 16:55-65 |
| Silva, N R F A; Bonfante, E A; Rafferty, B T et al. (2011) Modified Y-TZP core design improves all-ceramic crown reliability. J Dent Res 90:104-8 |
| Rafferty, Brian T; Janal, Malvin N; Zavanelli, Ricardo A et al. (2010) Design features of a three-dimensional molar crown and related maximum principal stress. A finite element model study. Dent Mater 26:156-63 |
| Bonfante, Estevam A; Sailer, Irena; Silva, Nelson R F A et al. (2010) Failure modes of Y-TZP crowns at different cusp inclines. J Dent 38:707-12 |
| Guess, P C; Zhang, Y; Kim, J-W et al. (2010) Damage and reliability of Y-TZP after cementation surface treatment. J Dent Res 89:592-6 |
| Bonfante, Estevam A; da Silva, Nelson R F A; Coelho, Paulo G et al. (2009) Effect of framework design on crown failure. Eur J Oral Sci 117:194-9 |
| Coelho, P G; Silva, N R; Bonfante, E A et al. (2009) Fatigue testing of two porcelain-zirconia all-ceramic crown systems. Dent Mater 25:1122-7 |
| Rekow, E Dianne; Zhang, Guangming; Thompson, Van et al. (2009) Effects of geometry on fracture initiation and propagation in all-ceramic crowns. J Biomed Mater Res B Appl Biomater 88:436-46 |
| Coelho, Paulo G; Silva, Nelson R; Thompson, Van P et al. (2009) Effect of proximal wall height on all-ceramic crown core stress distribution: a finite element analysis study. Int J Prosthodont 22:78-86 |
| Zhang, Yu; Kim, Jae-Won; Bhowmick, Sanjit et al. (2009) Competition of fracture mechanisms in monolithic dental ceramics: flat model systems. J Biomed Mater Res B Appl Biomater 88:402-11 |
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