Investigation of Thermal Stress In Different Metal Based Dental Restorations By Mathematical Analysis
Purpose: The aim of this study is to investigate the effect of heat changes in oral environment that produce thermal stresses (TS) in prosthetic restorations by mathematical method.
Material and Methods: Three different metallic frameworks in gold alloy, commercial pure titanium (cpTi) and chrome-cobalt- molybdenum (CrCoMo) and the ceramics, Ticeramics for cpTi, Omega900 for CrCoMo and VM13 for Au alloys were used for mathematical modeling. The physical properties were obtained from the manufactures. The calculation method was based on Boley’s equation.
Results: In ceramics the highest thermal stress was in Ticeramic and the lowest was in VM13. At interface of the restoration thermal stress accumulation was the highest in cpTi and Ticeramic and the lowest was in Au and VM13. In metallic substructures CrCoMo shows the highest and Au had the lowest thermal stress depositon in its structures.
Conclusion: Thermal stresses are not cable off breaking the metal-ceramic bond strength but shorten the life span of the prosthetics.
Key Words: Thermal stress, Dental materials, Ceramics, Titanium
Oyafuso DK, Ozcan M, Bottino MA, Itinoche MK. Influence of thermal and mechanical cycling on the flexural strength of ceramics with titanium and gold alloy frameworks. Dent Mater 2008;24:351–356.
Lin M, Xu F, Lu TJ, Bai BF. A review of heat transfer in human tooth- Experimental characterization and mathematical modeling. Dent Mater 2010;26:501-513.
Haskan H, Boyraz T, Kilicarslan MA. Investigation of thermal stresses in dental restoration by mathematical method. J Eur Ceram Soci 2007; 27:899–902.
Vojdani M, Shaghaghian S, Khaledi A, Adibi S. The effect of thermal and mechanical cycling on bond strength of a ceramic to nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys. Indian J Dent Res 2012;23:509-13.
Mill LL. Framework design in ceramco-metal restorations. Dent Clin North Am 1977;21:699-716.
Phillips RW. Science of dental materials: 9th Ed. USA: WB Saunders Company, 1991;437-440.
Güngör MA, Küçük M, Dündar M, Karacaoğlu C, Artunç C. Effect of temperature and stress distribution on all ceramic restorations by using a three-dimensional finite element analysis. J of Oral Rehab 2004;31:172-178.
McLean JW. The science and art of dental Ceramics. The nature of dental ceramics and their clinical use: Vol. 1. Chicago: Quintessence,1977;19-127.
Boley A, Weiner JH. Theory of Thermal Stresses. New York: Wiley,1960:277-281.
Aktas G, Sahin E, Vallittu P, Ozcan M, Lassila L. Effect of colouring green stage zirconia on the adhesion of veneering ceramics with different thermal expansion coefficients. Int J Oral Sci 2013;5(4):236–241.
Toparlı M, Sasakı S. Finite element analysis of the temperature and thermal stress in a postrestored tooth. Journal of Oral Rehab 2003;30:921-926.
Hsueh CH, Thompson GA, Jadaan Becher PF. Analyses of layer-thickness effects in bilayered dental ceramics subjected to thermal stresses and ring-on-ring tests. Dent Mater 2008;24:9-17.
Benetti P, Kelly R, Sanchez M, Bona A. Influence of thermal gradients on stress state of veneered restorations. Dent Mater 2014;30:554-563.
Fujibayashi S, Takemoto M, Neo M, Matsushita T, Kokubo T, Doi K, Ito T, Shimizu A, Nakamura T. A novel synthetic material for spinal fusion: a prospective clinical trial of porous bioactive titanium metal for lumbar interbody fusion. Eur Spine J 2011;20:1486-1495.
Oshida Y, Tuna EB, Aktören O, Gençay K. Dental Implant Systems. Int J Mol Sci 2010;11:1580-1678.
Vasquez VZC, Özcan M, Kimpara ET. Evaluation of interface characterization and adhesion of glass ceramics to commercially pure titanium and gold alloy after thermal- and mechanical-loading. Dent Mater 2009;25:221-231.
Eğilmez F, Nalbant L. Comparative evaluation of thermal stresses produced by hot irritant on zirconia and glass fiber-reinforced composite posts and tooth structure. Cumhuriyet Dent J 2012;15(2):138-148.
Oskui Z, Ashtiani M, Ata H, Hamid J. Effect of thermal stresses on the mechanism of tooth pain. J Endod 2014;40:1835-1839.
How to cite this article: M. Emre Coskun, Tahsin Boyraz, Faik Tuğut, Hakan Akin. Investigation of
thermal stress in different metal-ceramic restorations by mathematical analysis. Cumhuriyet Dent J 2015;18(4):311-317.
This work is licensed under a Creative Commons Attribution-Gayriticari-NoDerivs 3.0 Unported Lisansı