MSA  Vol.9 No.13 , December 2018
Difference in Surface Roughness of Ethylene-Vinyl-Acetate Sheet before and after Application of Finishing Liquid
Abstract: Surface texture of the mouthguard affects the sense of adaptation in the athlete and further affects hygiene. Therefore, finish polishing is extremely important. The aim of this study was to investigate the difference in the surface roughness after finishing polishing of ethylene-vinyl-acetate (EVA) sheets and after application of the finishing liquid, and to evaluate its effectiveness. Total of 48 specimens of EVA (3 × 3 mm) were divided into 4 groups according to polishing condition (control = unpolished; condition A = Robinson-brush; condition B = Lisko-Fine, and condition C = Mouthguard-wheel). Polishing was performed at low speed by using a straight headpiece. The rotation speeds were 5000, 4000 and 6000 rpm for condition A, B, and C, respectively. Next, a finishing liquid was applied to each specimen. For application, a cotton swab was used, and it was applied by three reciprocations. A non-contact surface shape measuring machine was used for measuring surface roughness; the measurement range is 1.65 mm and the resolution is 0.01 nm. The arithmetic average height (Sa) was measured. The differences in the surface roughness before and 15 min after the application of the finishing liquid were analyzed by two-way analysis of variance and Bonferroni’s multiple comparison tests. Surface roughness of the specimen before application became coarse in the order of control, condition C, B and A, and Sa was about 0.20, 1.98, 2.92, and 4.71 μm, respectively. The degree of reduction in roughness was about 1.0 μm or more than each polished state in conditions A and B. Condition C was not significantly different before and after application. No significant difference was observed between condition B and C after application. The results of this study showed that the surface roughness decreased due to the application of the finishing liquid when the surface roughness after finish polishing was about 2.0 μm or more.
Cite this paper: Takahashi, M. and Bando, Y. (2018) Difference in Surface Roughness of Ethylene-Vinyl-Acetate Sheet before and after Application of Finishing Liquid. Materials Sciences and Applications, 9, 985-992. doi: 10.4236/msa.2018.913071.

[1]   Verissimo, C., Costa, P.V., Santos-Filho, P.C., Tantbirojn, D., Versluis, A. and Soares, C.J. (2016) Customfitted EVA Mouthguards: What Is the Ideal Thickness? A Dynamic Finite Element Impact Study. Dental Traumatology, 32, 95-102.

[2]   Gialain, I.O., Coto, N.P., Driemeier, L., Noritomi, P.Y. and Dias, R.B. (2016) A Three-Dimensional Finite Element Analysis of the Sports Mouthguard. Dental Traumatology, 32, 409-415.

[3]   Bochnig, M.S., Oh, M.J., Nagel, T., Ziegler, F. and Jost-Brinkmann, P.G. (2017) Comparison of the Shock Absorption Capacities of Different Mouthguards. Dental Traumatology, 33, 205-213.

[4]   Gawlak, D., Mańka-Malara, K., Mierzwińska-Nastalska, E., Gieleta, R., Kamiński, T. and Luniewska, M. (2017) A Comparison of Impact Force Reduction by Polymer Materials Used for Mouthguard Fabrication. Acta of Bioengineering and Biomechanics, 19, 89-95.

[5]   Tribst, J.P.M., de Oliveira, Dal Piva, A.M., Borges, A.L.S. and Bottino, M.A. (2018) Influence of Custom-Made and Stock Mouthguard Thickness on Biomechanical Response to a Simulated Impact. Dental Traumatology, 34, 429-437.

[6]   Gawlak, D., Mierzwińska-Nastalska, E., Mańka-Malara, K. and Kamiński, T. (2015) Assessment of Custom and Standard, Self-Adapted Mouthguards in Terms of Comfort and Users Subjective Impressions of Their Protective Function. Dental Traumatology, 31, 113-117.

[7]   Coto, N.P., Brito, e Dias, R.B., Costa, R.A, Antoniazzi, T.F. and Carvalho, E.P. (2007) Mechanical Behavior of Ethylene Vinyl Acetate Copolymer (EVA) Used for Fabrication of Mouthguards and Interocclusal Splints. Brazilian Dental Journal, 18, 324-328.

[8]   Kawai, K., Urano, M. and Ebisu, S. (2000) Effect of Surface Roughness of Porcelain on Adhesion of Bacteria and Their Synthesizing Glucans. The Journal of Prosthetic Dentistry, 86, 664-667.

[9]   Needleman, I., Ashley, P., Petrie, A., Fortune, F., Turner, W., Jones, J., Niggli, J., Engebretsen, L., Budgett, R., Donos, N., Clough, T. and Porter, S. (2013) Oral Health and Impact on Performance of Athletes Participating in the London 2012 Olympic Games: A Cross-Sectional Study. Journal of Sports Medicine, 47, 1054-1058.

[10]   Leal, A., Paula, A., Ramalho, A., Esteves, M., Ferreira, M.M. and Carrilho, E. (2015) Roughness and Microhardness of Composites after Different Bleaching Techniques. Journal of Applied Biomaterials & Functional Materials, 13, e381-e388.

[11]   Almeida, M.H., Ceschim, G.V., Ioriom N.L.P.P., Póvoa, H.C.C., Cajazeira, M.R.R., Guimaraes, G.S, Antunes, L.S. and Antunes, L.A.A. (2018) Influence of Thickness, Color, and Polishing Process of Ethylene-Vinyl-Acetate Sheets on Surface Roughness and Microorganism Adhesion. Dental Traumatology, 34, 51-57.

[12]   Takahashi, M. and Bando, Y. (2018) Effect of the Anteroposterior Position of the Model on Fabricated Mouthguard Thickness: Part 2 Influence of Sheet Thickness and Material. Dental Traumatology, 34, 370-377.

[13]   Takahashi, M. and Bando, Y. (2018) Thermoforming Method to Effectively Maintain Mouthguard Thickness: Effect of Moving the Model Position Just before Vacuum Formation. Dental Traumatology, in press.

[14]   Fawzy, A.S., Amer, M.A. and El-Askary, F.S. (2008) Sodium Hypochlorite as Dentin Pretreatment for Etch-and-Rinse Single-Bottle and Two-Step Self-Etching Adhesives: Atomic Force Microscope and Tensile Bond Strength Evaluation. The Journal of Adhesive Dentistry, 10, 135-144.

[15]   Sul, Y.T., Kang, B.S., Johansson, C., Um, H.S., Park, C.J. and Albrektsson, T. (2009) The Roles of Surface Chemistry and Topography in the Strength and Rate of Osseointegration of Titanium Implants in Bone. Journal of Biomedical Materials Research Part A, 89, 942-950.

[16]   Koshihara, T., Hara, M., Sato, T., Hayashibara, T., Masuda, T. and Shinya, A. (2016) Evaluation of the Surface Texture of CAD/CAM-Produced Crowns among Various Types of CAD/CAM Milling Systems. The Shikwa Gakuho, 116, 149-153. (In Japanese)

[17]   Olympus Scientific Solutions Americas Corp. Height Parameters (Amplitude Mean in the Height Direction).