Nanomechanical Assessment of Bone Surrounding Implants Loaded for 3 Years in a Canine Experimental Model

Autor(es)

Anchieta, Rodolfo B. ^{[1, 2, 3]} ; Guimaraes, Marcia V. M. ; Suzuki, Marcelo ^[4] ; Tovar, Nick ^[1] ; Bonfante, Estevam A. ^[5] ; Atria, Pablo ^[6] ; Coelho, Paulo G. ^{[1, 7, 8]}

Afiliação do(s) autor(es)

^[1] NYU, Dept Biomat & Biomimet, New York, NY - USA

^[2] Ctr Univ Norte Paulista UNORP, Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Estadual Paulista, Dept Restorat Denst, UNESP, Aracatuba, SP - Brazil

^[4] Tufts Univ, Dept Prosthodont & Operat Dent, Sch Dent Med, Boston, MA 02111 - USA

^[5] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Al Otavio Pinheiro Brisola 9-75, Bauru, SP - Brazil

^[6] Univ Los Andes, Santiago - Chile

^[7] NYU, Langone Med Ctr, Hansjorg Wyss Dept Plast Surg, New York, NY - USA

^[8] NYU, Tandon Sch Engn, Mech & Aerosp Engn, New York, NY - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY; v. 76, n. 1, p. 71-79, JAN 2018.
• Citações Web of Science: 2

Resumo

Purpose: This work evaluated the nanomechanical properties of bone surrounding submerged and immediately loaded implants after 3 years in vivo. It was hypothesized that the nanomechanical properties of bone would markedly increase in immediately and functionally loaded implants compared with submerged implants. Materials and Methods: The second, third, and fourth right premolars and the first molar of 10 adult Doberman dogs were extracted. After 6 months, 4 implants were placed in 1 side of the mandible. The mesial implant received a cover screw and remained unloaded. The remaining 3 implants received fixed dental prostheses within 48 hours after surgery that remained in occlusal function for 3 years. After sacrifice, the bone was prepared for histologic and nanoindentation analysis. Nanoindentation was carried out under wet conditions on bone areas within the plateaus. Indentations (n = 30 per histologic section) were performed with a maximum load of 300 mu N (loading rate, 60 mu N per second) followed by a holding and unloading time of 10 and 2 seconds, respectively. Elastic modulus (E) and hardness (H) were computed in giga-pascals. The amount of bone-to-implant contact (BIC) also was evaluated. Results: The E and H values for cortical bone regions were higher than those for trabecular bone regardless of load condition, but this difference was not statistically significant (P > .05). The E and H values were higher for loaded implants than for submerged implants (P < .05) for cortical and trabecular bone. For the same load condition, the E and H values for cortical and trabecular bone were not statistically different (P > .05). The loaded and submerged implants presented BIC values (mean +/- standard deviation) of 57.4 +/- 12.1% and 62 +/- 7.5%, respectively (P > .05). Conclusion: The E and H values of bone surrounding dental implants, measured by nanoindentation, were higher for immediately loaded than for submerged implants. (C) 2017 American Association of Oral and Maxillofacial Surgeons (AU)

• Processo FAPESP: 12/19078-7 - Desenvolvimento e processamento de compósito de Al2O3-ZrO2 para próteses monolíticas CAD/CAM: efeito do envelhecimento na resistência à flexão biaxial
• Beneficiário: Estevam Augusto Bonfante
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores