Effect of Surface Treatment on Elemental Composition of Recast NiCr Alloy

Tevfik Yavuz, Aslı Acar, Serhan Akman, Atiye Nilgun Ozturk

Department of Prosthodontics, Gaziantep University, Gaziantep, Turkey.
Department of Prosthodontics, Selcuk University, Konya, Turkey.

DOI: 10.4236/msa.2012.33025                

Abstract

Objective: The aim of this study was to compare the effects of different surface treatments on the elemental composition stability of as-received and recast types of NiCr casting alloys. Material and Methods: Six commercial NiCr dental casting alloys (Kera N, Nodelco, Bellabond, Wiron 99, Metaplus VK, and Tritech D) were used in this study. Seventy-two specimens (12 × 12 × 1.2 mm) were produced using the lost-wax casting process. Three casting protocols were established in relation to the proportion of as-received and recast alloys: Group A (100% as-received metal), Group B (50 wt% new metal, 50 wt% once-recast metal), and Group C (100% once-recast metal). Two specimens in every group received two different surface treatments: sandblasting with 110 μmm Al2O3 or oxidation firing. An elemental analysis was performed with x-ray energy-dispersive spectroscopy. Results were subjected to one-way analysis of variance and Tukey HSD tests. Results: The elemental composition was significantly different in the casting groups and treatment groups (p < 0.05). The lowest mean weight percentage Ni value was recorded for Group C and the highest for Group A. Aluminum-oxide sandblasting of the alloy surface reduced the mean weight percentage for Cr. Conclusion: Recasting metal alloys may adversely affect surface quality.

Keywords

Recasting; Elemental Composition; NiCr Alloy

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	H. H. Huang, M. C. Lin, T. H. Lee, H. W. Yang, F. L. Chen, S. C. Wu and C. C. Hsu, “Effect of Chemical Composition of Ni-Cr Dental Casting Alloys on the Bonding Characterization between Porcelain and Metal,” Journal of Oral Rehabilitation, Vol. 32, No. 3, 2005, pp. 206-212. doi:10.1111/j.1365-2842.2004.01411.x
[2]	M. F. Ayad, “Compositional Stability and Marginal Accuracy of Complete Cast Crowns Made with As-Received and Recast Type III Gold Alloy,” Journal of Prosthetic Dentistry, Vol. 87, No. 2, 2002, pp. 162-166. doi:10.1067/mpr.2002.121024
[3]	D. A. Hesby, P. Kobes, D. G. Garver and G. B. Pelleu Jr., “Physical Properties of a Repeatedly Used Nonprecious Metal Alloy,” Journal of Prosthetic Dentistry, Vol. 44, No. 3, 1980, pp. 291-293. doi:10.1016/0022-3913(80)90014-1
[4]	R. G. Presswood, “Multiple Recast of a Nickel-Chromium- Beryllium Alloy,” Journal of Prosthetic Dentistry, Vol. 50, No. 2, 1983, pp. 198-199. doi:10.1016/0022-3913(83)90012-4
[5]	S. Ozdemir and A. Arikan, “Effects of Recasting on the Amount of Corrosion Products Released from Two Ni-Cr Base Metal Alloys,” European Journal of Prosthodontics and Restorative Dentistry, Vol. 6, No. 4, 1998, pp. 149-153.
[6]	R. H. Liu, W. M. Johnston, J. A. Holloway, W. A. Brantley and T. Dasgupta, “The Effect of Metal Recasting on Porcelain-Metal Bonding: A Force-To-Failure Study,” Journal of Prosthetic Dentistry, Vol. 104, No. 3, 2010, pp. 165-172. doi:10.1016/S0022-3913(10)60114-X
[7]	K. J. Anusavice, “Phillips’ Science of Dental Materials,” 10th Edition, WB Saunders, Philadelphia, 1996.
[8]	R. G. Craig, J. M. Powers and J. C. Wataha, “Dental Materials Properties and Manipulation,” 11th Edition, C. V. Mosby Company, St. Louis, 2001.
[9]	L. Baum, R. W. Phillips and M. R. Lund, “Textbook of Operative Dentistry,” 3rd Edition, WB Saunders, Phila- delphia, 1995.
[10]	O. L. Bezzon, R. F. Ribeiro, J. M. Rollo and S. Crosara, “Castability and Resistance of Ceramometal Bonding in Ni-Cr and Ni-Cr-Be Alloys,” Journal of Prosthetic Dentistry, Vol. 85, No. 3, 2001, pp. 299-304. doi:10.1067/mpr.2001.113779
[11]	L. Issac and S. Bhat, “Effect of Re-Using Nickel- Chromium Alloy on ?ts Ultimate Tensile Strength, Yield Strength and Modulus of Elasticity,” Indian Journal of Dental Research, Vol. 9, No. 1, 1998, pp. 13-17.
[12]	N. Mirkovic, “Effect of Recasting on the Elastic Modulus of Metal-Ceramic Systems from Nickel-Chromium and Cobalt-Chromium Alloys,” Vojnosanitetski Pregled, Vol. 64, No. 7, 2007, pp. 469-473. doi:10.2298/VSP0707469M
[13]	A. S. Al-Hiyasat, O. M. Bashabsheh and H. Darmani, “An ?nvestigation of the Cytotoxic Effects of Dental Casting Alloys,” International Journal of Prosthodontics, Vol. 16, No. 1, 2003, pp. 8-12.
[14]	M. R. Nakhaei, J. Ghanbarzadeh and R. Goharian, “The Effect of Recast Base Metal Alloys on Crown’s Marginal Accuracy,” Journal of Medical Sciences, 2008, Vol. 8, No. 6, pp. 599-602. doi:10.3923/jms.2008.599.602
[15]	A. S. Al-Hiyasat and H. Darmani, “The Effects of Recasting on the Cytotoxicity of Base Metal Alloys,” Journal of Prosthetic Dentistry, Vol. 93, No. 2, 2005, pp. 158-163. doi:10.1016/j.prosdent.2004.11.009
[16]	H. J. Harcourt and W. F. Cotterill, “Induction Melting of Cobalt-Chromium Alloys; a Comparison with Flame Melting,” British Dental Journal, Vol. 20, No. 118, 1965, pp. 323-329.
[17]	J. M. Hong, M. E. Razzoog and B. R. Lang, “The Effect of Recasting on the Oxidation Layer of a Palladium Silver Porcelain Alloy,” Journal of Prosthetic Dentistry, Vol. 59, No. 4, 1988, pp. 420-425. doi:10.1016/0022-3913(88)90035-2
[18]	D. R. Nelson, J. F. Palik, H. F. Morris and M. C. Comella, “Recasting a Nickel-Chromium Alloy,” Journal of Prosthetic Dentistry, Vol. 55, No. 1, 1986, pp. 122-127. doi:10.1016/0022-3913(86)90087-9
[19]	Jayant Palaskar, D. V. Nadgir and I. Shah, “Effect of Recasting of Nickel-Chromium Alloy on Its Hardness,” Internat?onal J of Dental Cl?n?cs, Vol. 2, No. 4, 2010, pp. 8-11.
[20]	A. A. Al-Ali, “Evaluation of Macrohardness of Recasted Cobalt-Chromium Alloy,” Al-Rafidain Dental Journal, Vol. 7, No. 1, 2007, pp. 111-117.
[21]	H. Petridis, P. Garefis, H. Hirayama, N. M. Kafantaris and P. T. Koidis, “Bonding ?ndirect Resin Composites to Metal: Part 2. Effect of Alloy Surface Treatment on Elemental Composition of Alloy And Bond Strength,” International Journal of Prosthodontics, Vol. 17, No. 1, 2004, pp. 77-82.
[22]	E. Papazoglou, W. A. Brantley, W. M. Johnston and A. B. Carr, “Effects of Dental Laboratory Processing Variables and in Vitro Testing Medium on the Porcelain Adherence of High-Palladium Casting Alloys,” Journal of Prosthetic Dentistry, Vol. 79, No. 5, 1998, pp. 514-519. doi:10.1016/S0022-3913(98)70171-4
[23]	M. Gladwin and M. Bagby, “Clinical Aspects of Dental Materials,” Lippincott Williams & Wilkins, Philadelphia 2000.