Influencia do tratamento de superficie em uma liga de paladio-prata na resistencia de união de agentes cimentantes
AUTOR(ES)
Luiz Henrique Maykot Prates
DATA DE PUBLICAÇÃO
2000
RESUMO
The purpose of this study was to evaluate the influence of four metal surface treatments on the shear bond strength of three luting agents. Cast samples in a disk shape (5 mm in diameter) were made with palladium-silver alloy and grouped in pairs afier ultrasonic cleaning. The pairs were assigned into four groups of 30 each and submitted to the following treatments on the circular surfaces opposite to that of the sprue former: 1 - as cast (control); 2 - aluminum oxide blasting (320 mash); 3 - aluminum oxide blasting (60 mash); and 4 - glass beads blasting (270 mash). Afier new ultrasonic cleaning in distilled water, during 5 minutes, the samples of each group were assigned into three subgroups of 10 each, being made the cementing, by the treated surfaces, with the following luting agents: A - zinc phosphate cement; B - resin-modified glass ionomer cement; and C ? resin cement. Before luting, 10 specimens of each treatment had the surfaces measured for roughness and two samples were prepared to observation in scanning electronic microscope. Afier storing in distilled water at 37°C, during 24 hours, the cemented pairs were submitted to shear bond strength tests in an Instron machine (1 mm/min), until the failure. The results were analyzed by ANOVA and Tukey s test (p <0,05) and the means (MPa) were: Group 1 A: 1.77 (0.51); Group 1 B: 3.18 (1.42); Group 1 C: 1.63 (0.55); Group 2 A: 5.22 (0.88); Group 2 B: 11.90 (1.94); Group 2 C: 16.29 (3.94); Group 3 A: 4.03 (0.78); Group 3 B: 11.41 (2.69); Group 3 C: 14.15 (2.71); _Group 4 A: 1.59 (0.44); Group 4 B: 2.24 (0.71); Group 4 C: 1.74 (0.51). The metallic surfaces submitted to the aluminum oxide blast treatment (320 or 60 mash) showed bond strengths significantly higher than those of surfaces as cast or submitted to glass beads blast (270 mash). On surfaces treated with aluminum oxide blast, the resin cement and the resin-modified glass ionomer cement showed bond strengths statistical/y superior to those of the zinc phosphate cement. There was not a relationship between the bond strengths of cementing agents and the roughness of metal/ic surfaces
ASSUNTO(S)
dental cements cimentos dentarios dental materials materiais dentarios oxido de aluminio - fundição aluminum oxide dental casting
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000219069Documentos Relacionados
- Resistencia a tração de agentes cimentantes usados na fixação de ligas de paladio-prata e niquel-cromo a dentina
- Influencia da refundição de liga de paladio-prata na desadaptação cervical e interna de coroas totais metalicas
- Influência do tratamento de superfície na resistência de união de cimentos resinosos em liga de níquel
- Bond strength of three ceramic systems and a palladium-silver alloy
- Influencia das temperaturas de cocção de porcelanas no desajuste cervical de copings em titanio comercialmente puro e ligas titanio-aluminio-vanadio e paladio-prata