| Full text | |
| Author(s): |
Toyama, Dominique Yukie
[1]
;
Martins Alves, Larissa Marcia
[1]
;
Ramos, Gabriela Freitas
[1]
;
Bastos Campos, Tiago Moreira
[2]
;
de Vasconcelos, Getulio
[3]
;
Souto Borges, Alexandre Luiz
[1]
;
de Melo, Renata Marques
[1]
Total Authors: 7
|
| Affiliation: | [1] Sao Paulo State Univ Unesp, Inst Sci & Technol Sao Jose dos Campos, Dept Dent Mat & Prosthodont, Engn Francisco Jose Longo Ave 777, BR-12245000 Sao Jose Dos Campos, SP - Brazil
[2] Technol Inst Aeronaut, Dept Phys, Praca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Inst Adv Studies, Space Tech Ctr, Photon Div, Rodovia Tamoios Km 5, 5, BR-12231970 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 89, p. 143-149, JAN 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
Conventionally veneered zirconia restorations are susceptible to chipping and spalling of the veneering material. The novel translucent zirconias were developed to overcome such issues, although layered zirconia restorations can be re-designed to improve mechanical performance. Thus, the aim of this study was to analyze the strength and structural reliability of zirconia bilayers using conventional (porcelain ceramic under tensile stress) and bioinspired (zirconia under tensile stress) configurations. Sol-gel silica infiltration served as a smooth transition between the zirconia and veneering porcelain. Failure mode and interfacial adhesive mechanism were analyzed using scratch test and interfacial indentation. Bilayered specimens were produced for biaxial flexural testing with Y-TZP and pressed ceramic, which were further divided into four groups (n = 30): Conventional (C), Infiltrated conventional (IC), Bioinspired (B) and Infiltrated bioinspired (IB). The results of biaxial flexural strength tests were analyzed by Weibull analysis (95% CI) for determination of the Weibull modulus (m). The infiltration layer was characterized by XRD and SEM, FEG-SEM and EDS. The bioinspired infiltrated group was the most reliable (m = 9.59), although the fine damage of veneered conventional (conventional) zirconia demonstrated its superior resistance to scratching and debonding. Therefore, the filling of superficial defects by zirconia silicate demonstrated the need for mechanical retention for better porcelain adhesion. (AU) | |
| FAPESP's process: | 16/07920-6 - Silica infiltrated zirconia obtained through the sol-gel method for dental applications |
| Grantee: | Renata Marques de Melo Marinho |
| Support Opportunities: | Regular Research Grants |