Initial investigation of the corrosion stability of craniofacial implants

Autor(es)

Beline, Thamara ^[1] ; Vechiato Filho, Aljomar Jose ^[2] ; Wee, Alvin G. ^{[3, 4]} ; Sukotjo, Cortino ^[5] ; dos Santos, Daniela Micheline ^[6] ; Brandao, Thais Bianca ^[2] ; Ricardo Barao, Valentim Adelino ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Fac Med, Inst Canc Sao Paulo, Dent Oncol Serv, Sao Paulo - Brazil

^[3] Vet Affairs Nebraska Western Iowa Hlth Care Syst, Maxillofacial Prosthodont, Omaha, NE - USA

^[4] Creighton Univ, Sch Dent, Dept Prosthodont, Omaha, NE 68178 - USA

^[5] Univ Illinois, Coll Dent, Dept Restorat Dent, Chicago, IL - USA

^[6] Sao Paulo State Univ, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHETIC DENTISTRY; v. 119, n. 1, p. 185-192, JAN 2018.
• Citações Web of Science: 0

Resumo

Statement of problem. Although craniofacial implants have been used for retention of facial prostheses, failures are common. Titanium undergoes corrosion in the oral cavity, but the corrosion of craniofacial implants requires evaluation. Purpose. The purpose of this in vitro study was to investigate the corrosion stability of commercially pure titanium (CP Ti) exposed to simulated human perspiration at 2 different pH levels (5.5 and 8). Material and methods. Fifteen titanium disks were divided into 3 groups (n=5 per group). The control group was subjected to simulated body fluid (SBF) (control). Disks from the 2 experimental groups were immersed in simulated alkaline perspiration (SA(K)P) and simulated acidic perspiration (SA(C)P). Electrochemical tests, including open circuit potential (3600 seconds), electrochemical impedance spectroscopy, and potentiodynamic tests were performed according to the standardized method of 3-cell electrodes. Data were analyzed by 1-way ANOVA and the Tukey honestly significant difference tests (alpha=.05). Results. Simulated human perspiration reduced the corrosion stability of CP Ti (P<.05). The SBF group presented the lowest capacitance values (P<.05). SA(K)P and SA(C)P groups showed increased values of capacitance and showed no statistically significant differences (P>.05) from each other. The increase in capacitance suggests that the acceleration of the ionic exchanges between the CP Ti and the electrolyte leads to a lower corrosion resistance. SA(K)P reduced the oxide layer resistance of CP Ti (P<.05), and an increased corrosion rate was noted in both simulated human perspiration groups. Conclusions. Craniofacial implants can corrode when in contact with simulated human perspiration, whereas alkaline perspiration shows a more deleterious effect. Perspiration induces a more corrosive effect than simulated body fluid. (AU)

• Processo FAPESP: 16/07269-3 - Deposição por pulverização catódica de filmes de óxido de tântalo (Ta2O5) na superfície de titânio para aplicações biomédicas: comportamento eletroquímico, biocompatibilidade e análise microbiológica
• Beneficiário: Thamara Beline
• Modalidade de apoio: Bolsas no Brasil - Doutorado