Context. An in vitro study carried out to evaluate and compare the effect of Cola drink on surface roughness of esthetic restorative materials. Purpose. To compare the effect of different immersion regimes in a Cola drink on surface roughness of esthetic restorative materials. Method. Two hundred samples were grouped into 4 equal groups of 50 samples each: Group I: conventional glass ionomer, Group II: resin modified glass ionomer, Group III: polyacid-modified resin composite, Group IV: Composite resin. Each group was further subdivided into 5 subgroups of 10 samples each. Subgroup A (Control Subgroup). Samples were kept immersed in artificial saliva. Subgroup B. Samples were immersed in Cola drink once a day. Subgroup C. Samples were immersed in Cola drink, 3 times a day. Subgroup D. Samples were immersed in Cola drink 5 times a day. Subgroup E. Samples were immersed in Cola drink 10 times a day. Each immersion lasted 5 minutes. The immersion protocol was repeated for 7 days. Results. Maximum surface roughness was seen in Group I conventional glass ionomer cement, followed by Group II resin modified glass ionomer, Group III polyacid modified resin composite, and Group IV composite resin samples. Conclusion. Resistance to change in surface roughness is more in resin based restorative materials as compared to glass ionomer based materials. 1. Introduction The mouth is considered as the ideal environment for predicting the behavior of restorative materials [1]. Restorative filling materials used in dentistry are required to have long-term durability in the oral cavity [2]. Considering that tooth colored restorative materials are commonly used for restorations in children and adolescents, who in turn are major consumers of soft drinks, it is important not only to compare the performance of different restorative materials but also to estimate their chemical durability. Under acidic conditions, restorative materials suffer degradation over time, which can be predicted by changes in the surface roughness. Studies reporting the association of frequency of soft drink ingestion have shown an increased degradative potential with the increase in frequency of consumption [3]. Due to the complexity and diversity of intraoral conditions, in vitro models are very important for providing an insight into the fundamental mechanisms of biodegradation [1]. Therefore this in vitro study was conducted to evaluate and compare the effect of Cola drink (Coca-Cola), on the surface roughness of tooth colored restorative materials after exposure to different immersion regimes. 2.
References
[1]
A. L. F. Briso, L. P. Caruzo, A. P. A. Guedes, A. Catelan, and P. H. dos Santos, “In vitro evaluation of surface roughness and microhardness of restorative materials submitted to erosive challenges,” Operative Dentistry, vol. 36, no. 4, pp. 397–402, 2011.
[2]
K. Okada, S. Tosaki, K. Hirota, and W. R. Hume, “Surface hardness change of restorative filling materials stored in saliva,” Dental Materials, vol. 17, no. 1, pp. 34–39, 2001.
[3]
G. Maupomé, J. Díez-de-Bonilla, G. Torres-Villase？or, L. D. C. Andrade-Delgado, and V. M. Casta？o, “In vitro quantitative assessment of enamel microhardness after exposure to eroding immersion in a cola drink,” Caries Research, vol. 32, no. 2, pp. 148–153, 1998.
[4]
V. V. Badra, J. J. Faraoni, R. P. Ramos, and R. G. Palma-Dibb, “Influence of different beverages on the microhardness and surface roughness of resin composites,” Operative Dentistry, vol. 30, no. 2, pp. 213–219, 2005.
[5]
J. Klimek, E. Hellwig, and G. Ahrens, “Fluoride taken up by plaque, by the underlying enamel and by clean enamel from three fluoride compounds in vitro,” Caries Research, vol. 16, no. 2, pp. 156–161, 1982.
[6]
I. M. Hamouda, “Effects of various beverages on hardness, roughness, and solubility of esthetic restorative materials,” Journal of Esthetic and Restorative Dentistry, vol. 23, no. 5, pp. 315–322, 2011.
[7]
S. Gladys, B. van Meerbeek, M. Braem, and P. Lambrechts, “Comparative physico-mechanical characterization of new hybrid restorative materials with conventional glass-ionomer and resin composite restorative materials,” Journal of Dental Research, vol. 76, no. 4, pp. 883–894, 1997.
[8]
D. I. EI-Korashyand and E. H. Mobarak, “Effect of cola drinks on surface roughness of some contemporary tooth-colored restorative materials: a non-contact interferometric approach,” Egyptian Dental Journal, vol. 52, no. 2.1, pp. 895–905, 2006.
[9]
M. A. Cattani-Lorente, V. Dupuis, F. Moya, J. Payan, and J.-M. Meyer, “Comparative study of the physical properties of a polyacid-modified composite resin and a resin-modified glass ionomer cement,” Dental Materials, vol. 15, no. 1, pp. 21–32, 1999.
[10]
M. A. Mohamed-Tahir and A. U. J. Yap, “Effects of pH on the surface texture of glass ionomer based/containing restorative materials,” Operative Dentistry, vol. 29, no. 5, pp. 586–591, 2004.
[11]
C. P. Turssi, C. S. de Magalh？es, M. C. Serra, and A. L. Rodrigues Júnior, “Surface roughness assessment of resin-based materials during brushing preceded by pH-cycling simulations,” Operative Dentistry, vol. 26, no. 6, pp. 576–584, 2001.
[12]
K. J. M. Soderholm, “Leaking of fillers in dental composites,” Journal of Dental Research, vol. 62, no. 2, pp. 126–130, 1983.
[13]
L. Han, A. Okamoto, M. Fukushima, and T. Okiji, “Evaluation of flowable resin composite surfaces eroded by acidic and alcoholic drinks,” Dental Materials Journal, vol. 27, no. 3, pp. 455–465, 2008.
[14]
Y. Bagheri, K. G？k？e, and M. Kazak, “Subsurface degradation of resin based composites,” Dental Materials, vol. 23, no. 8, pp. 944–951, 2007.
[15]
A. C. Valinoti, B. G. Neves, E. M. da Silva, and L. C. Maia, “Surface degradation of composite resins by acidic medicines and pH-cycling,” Journal of Applied Oral Science, vol. 16, no. 4, pp. 257–265, 2008.
