| Texto completo | |
| Autor(es): |
Bergamo, Edmara T. P.
;
de Araujo-Junior, Everardo N. S.
;
Lopes, Adolfo C. O.
;
Coelho, Paulo G.
;
Zahoui, Abbas
;
Benalcazar Jalkh, Ernesto B.
;
Bonfante, Estevam A.
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | BIOMED RESEARCH INTERNATIONAL; v. 2020, p. 11-pg., 2020-09-08. |
| Resumo | |
The reduced hardware design of narrow implants increases the risk of fracture not only of the implant itself but also of the prosthetic constituents. Hence, the current study is aimed at estimating the probability of survival of anterior crowns supported by different narrow implant systems. Three different narrow implant systems of internal conical connections were evaluated (o3.5x10 mm): (i) Active (Nobel Biocare), (ii) Epikut (S.I.N. Implant System), and (iii) BLX (Straumann). Abutments were torqued to the implants, and standardized maxillary incisor crowns were cemented. The assemblies were subjected to step-stress accelerated life testing (SSALT) in water through load application of 30 degrees off-axis lingually at the incisal edge of the crowns using a flat tungsten carbide indenter until fracture or suspension. The use level probability Weibull curves and reliability for completion of a mission of 100,000 cycles at 80 N and 120 N were calculated and plotted. Weibull modulus and characteristic strength were also calculated and plotted. Fractured samples were analyzed in a stereomicroscope. The beta (beta) values were 1.6 (0.9-3.1) and 1.4 (0.9-2.2) for BLX and Active implants, respectively, and 0.5 (0.3-0.8) for the Epikut implant, indicating that failures were mainly associated with fatigue damage accumulation in the formers, but more likely associated with material strength in the latter. All narrow implant systems showed high probability of survival (>= 95%, CI: 85-100%) at 80 and 120 N, without significant difference between them. Weibull modulus ranged from 6 to 14. The characteristic strength of Active, Epikut, and BLX was 271 (260-282) N, 216 (205-228) N, and 275 (264-285) N, respectively. The failure mode predominantly involved abutment and/or abutment screw fracture, whereas no narrow implant was fractured. Therefore, all narrow implant systems exhibited a high probability of survival for anterior physiologic masticatory forces, and failures were restricted to abutment and abutment screw. (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 |
| Processo FAPESP: | 16/18818-8 - EMU concedido no processo 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package |
| Beneficiário: | Estevam Augusto Bonfante |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |
| Processo FAPESP: | 19/08693-1 - Compósitos experimentais à base de alumina e zircônia infiltrados por vidro: caracterização microestrutural e das propriedades ópticas e mecânicas. |
| Beneficiário: | Edmara Tatiely Pedroso Bergamo |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 19/00452-5 - COMPÓSITOS EXPERIMENTAIS 70%Al2O3-30%ZrO2: CARACTERIZAÇÃO MECÂNICA, ESTRUTURAL E TOPOGRÁFICA |
| Beneficiário: | Ernesto Byron Benalcazar Jalkh |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 18/03072-6 - Compósitos experimentais 70%Al2O3-30%ZrO2: caracterização estrutural e da sobrevida antes e após envelhecimento |
| Beneficiário: | Ernesto Byron Benalcazar Jalkh |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 19/14798-0 - Desenvolvimento de blocos pré sinterizados de compósito ZTA - 80%Al2O3/20%ZrO2 para fresagem em sistema CAD/CAM |
| Beneficiário: | Adolfo Coelho de Oliveira Lopes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |