Effects of Y-TZP blank manufacturing control and addition of TiO2 nanotubes on structural reliability of dental materials

Autor(es)

Rodrigues Magalhaes, Ana Paula ^[1] ; Fortulan, Carlos Alberto ^[2] ; Lisboa-Filho, Paulo Noronha ^[3] ; Ramos-Tonello, Carla Muller ^[1] ; Gomes, Orisson Ponce ^[3] ; Cesar, Paulo Francisco ^[4] ; Fukushima, Karen Akemi ^[4] ; Lia Mondelli, Rafael Francisco ^[1] ; Sanches Borges, Ana Flavia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Operat Dent Endodont & Dent Mat, Bauru Sch Dent, Al Octavio Pinheiro Brisola 9-75, BR-17012901 Bauru, SP - Brazil

^[2] Univ Sao Paulo, Dept Mech Engn, Ave Trabalhadores Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[3] State Univ Sao Paulo UNESP, Dept Phys, Fac Sci, Nucl Res Pres Geisel, Ave Engn Luis Edmundo Carrijo Coube 14, BR-17033360 Bauru, SP - Brazil

^[4] Univ Sao Paulo, Dept Biomat & Oral Biol, Ave Prof Lineu Prestes 2227, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 44, n. 3, p. 2959-2967, FEB 15 2018.
• Citações Web of Science: 3

Resumo

Titanium dioxide (TiO2) nanotubes have been applied to enhance the mechanical and biological properties of dental materials. Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) have been increasingly used in dentistry as a substructure for crowns and fixed partial prostheses. Aside from its optimal clinical results, Y-TZP is prone to failures due to microstructure-related defects introduced in the manufacturing process that may lower its structural and clinical reliability. The purpose of this study was to evaluate the role of the manufacturing process of blanks as well as their original composition modification by addition of TiO2 nanotubes (0%, 1%, 2% and 5% in volume) while controlling all manufacturing steps. Materials were subjected to a biaxial flexural strength test, a fractographic qualitative analysis by scanning electron microscopy (SEM), a microstructure evaluation in field emission-SEM and X-ray diffraction. Values of flexural strength were subjected to ANOVA, Tukey (cc = 0.05) and Weibull statistics. Grain size values were subjected to Kruskal-Wallis and Dunn tests (cc = 0.05). Highlights of the results include that for experimental Y-TZP added 2% vol TiO2 nanotube ceramics presented flexural strength values at 577 MPa and Weibull modulus (m) at 8.1. The addition of TiO2 nanotubes in different blends influenced experimental Y-TZP properties, leading to lower flexural strength, although they presented higher m than the commercial Y-TZP. Nanotubes also led to bigger grain sizes, more pores and a slight increase in the monoclinic phase, influencing the microstructure of Y-TZP. Y-TZP blank manufacturing control as well as addition of TiO2 nanotubes led to higher m values and, hence, greater structural reliability. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 11/18061-0 - Análise mecânica, estrutural e de copings de zircônia experimental para uso em sistema CAD/CAM
• Beneficiário: Ana Flávia Sanches Borges
• Modalidade de apoio: Auxílio à Pesquisa - Regular