The fixation stability achieved with the use of plates and screws in oral and maxillofacial surgery is a decisive factor in treatment success. The mechanical and structural properties of the internal fixation materials have direct influence on the dimensional stability and resistance of a fixation system, thus influencing treatment outcomes. This study proposed to analyze the dimensional and resistance patterns of titanium plates used for obtaining stable fixation in orthognathic surgery and craniofacial trauma. For this study, 30？conventional 2.0mm straight four hole plates with bridge from three brands？commercialized in Brazil, were subjected to macroscopic, microscopic, strength and hardness analysis. The dimensional measurements were performed using？a digital caliper. Energy-dispersive X-ray spectroscopy analysis was performed by scanning electron microscopy to analyze the chemical composition of the？samples. The mechanical resistance tests were performed with a universal？testing machine. The samples were then submitted to Vickers hardness analysis, complying with the standards of ASTM E92. The data collected from the dimensional study was submitted to statistical analysis of the coefficient of variation, while the values obtained during the mechanical tests were analyzed by variance (ANOVA) and Tukey’s test (p <0.05). The sample groups presented different performances in resistance, hardness, size and surface, even though they were reported to be chemically similar compounds that allowed us to？conclude the plates from Group 2 were more resistant than groups 1 and 3.
References
[1]
Michelet, F.X., Deymes, J. and Dessus, B. (1973) Osteosynthesis with Miniaturized Screwed Plates in Maxillo-Facial Surgery. Journal of Maxillofacial Surgery, 1, 79-84. https://doi.org/10.1016/S0301-0503(73)80017-7
[2]
Ellis, E. (1993) Rigid Skeletal Fixation of Fractures. Journal of Oral and Maxillofacial Surgery, 51, 163-173. https://doi.org/10.1016/S0278-2391(10)80016-3
[3]
Obwegeser, H.L. (2007) Orthognathic Surgery and a Tale of How Three Procedures Came to Be: A Letter to the Next Generations of Surgeons. Clinics in Plastic Surgery, 34, 331-355. https://doi.org/10.1016/j.cps.2007.05.014
[4]
Ellis III, E. (2014) An Algorithm for the Treatment of Noncondylar Mandibular Fractures. Journal of Oral and Maxillofacial Surgery, 72, 939-949. https://doi.org/10.1016/j.joms.2013.11.026
[5]
Al-Moraissi, E.A. and Ellis, E. (2014) What Method for Management of Unilateral Mandibular Angle Fractures Has the Lowest Rate of Postoperative Complications? A systematic Review and Meta-Analysis. Journal of Oral and Maxillofacial Surgery, 72, 2197-2211. https://doi.org/10.1016/j.joms.2014.05.023
[6]
Feller, K.U.G., Richter, M. and Schneider, U. (2002) Combination of Microplate and Miniplate for Osteosynthesis of Mandibular Fractures: An Experimental Study. International Journal of Oral and Maxillofacial Surgery, 31, 78-83. https://doi.org/10.1054/ijom.2000.0182
[7]
Ellis III, E. and Esmail, N. (2009) Malocclusions Resulting from Loss of Fixation after Sagittal Split Ramus Osteotomies. Journal of Oral and Maxillofacial Surgery, 67, 2528-2533. https://doi.org/10.1016/j.joms.2009.06.022
[8]
Roig, M.A. (2002) Valoración a largo plazo de los resultados de tratamiento mediante osteosíntesis con miniplacas en sus diferentes usos en cirugía craneomaxilofacial. Tese (Doutorado em Cirurgia e Medicina)—Facultat de Medicina, Barcelona, 138 p.
[9]
Rocha Júnior, H.V., Padovan, L.E.M., Oliveira, R.B., Assis, D.S.F.R. and Duarte, M.A.H. (2013) Avaliação ultraestrutural,dimendional e mecanica de dois sistemas de fixação interna rígida de 2mm. Revista Salusvita, 32, 125-137.
[10]
Brasileiro, B.F. and Passeri, L.A. (2008) Avaliação dimensional de miniplacas e parafusos para cirurgia ortognática. Revista Brasileira de Cirurgia e Traumatologia, 5, 51-56.
[11]
Trivellato, A.E., Mazzonetto, R., Passeri, L.A. and Consani, S. (2000) Estudo químico, macroscópico e da resistência à flexão de placas e parafusos de titanio usados na fixação interna rígida. Pesquisa Odontológica Brasileira, 14, 392-398. https://doi.org/10.1590/S1517-74912000000400015
[12]
Brasileiro, B.F., Grempel, R.G., Ambrosano, G.M.B. and Passeri, L.A. (2009) An in Vitro Evaluation of Rigid Internal Fixation Techniques for Sagittal Split Ramus Osteotomies: Advancement Surgery. Journal of Oral and Maxillofacial Surgery, 67, 809-817. https://doi.org/10.1016/j.joms.2008.11.009
[13]
Haug, R.H., Street, C.C. and Goltz, M. (2002) Does Plate Adaptation Affect Stability? A Biomechanical Comparison of Locking and Nonlocking Plates. Journal of Oral and Maxillofacial Surgery, 60, 1319-1326. https://doi.org/10.1053/joms.2002.35732
[14]
Matthew, I.R., Frame, J.W., Browne, R.M. and Millar, B.G. (1996) In Vivo Surface Analysis of Titanium and Stainless Steel Miniplates and Screws. International Journal of Oral and Maxillofacial Surgery, 25, 463-468. https://doi.org/10.1016/S0901-5027(96)80085-3
[15]
De Oliveira, K.P., De Moraes, P.H., Da Silva, J.S.P., De Queiroz, W.F. and Germano, A.R. (2014) In Vitro Mechanical Assessment of 2.0-mm System Three-Dimensional Miniplates in Anterior Mandibular Fractures. International Journal of Oral and Maxillofacial Surgery, 43, 564-571. https://doi.org/10.1016/j.ijom.2013.10.008
[16]
Kunčická, K., Kocich, R. and Lowe, T.C. (2017) Advances in Metals and Alloys for Joint Replacement. Progress in Materials Science, 88, 232-280. https://doi.org/10.1016/j.pmatsci.2017.04.002
