Surface quality achieved by polishing and by varnishing of temporary crown and fixed partial denture resins.
J Prosthet Dent
; 82(5): 550-6, 1999 Nov.
Article
em En
| MEDLINE
| ID: mdl-10559726
ABSTRACT
STATEMENT OF PROBLEM:
Studies have suggested that coating a temporary restoration with varnish material could replace time-consuming polishing procedures needed for achieving an optimally smooth surface.PURPOSE:
This study examined the surface roughness of acrylic resins after having been polished or coated with different varnish materials. MATERIAL ANDMETHODS:
A total of 360 cylindrical specimens were fabricated from 9 brands of resin. One surface on each specimen was machined flat and subsequently either polished with rubber polishers or coated with 1 of 9 varnishes. Selected specimens were subjected to thermal cycling (5 degrees C to 55 degrees C, 2000 cycles). Surface quality was assessed by means of a profilometer and by SEM examination.RESULTS:
Polished specimens had average surface roughness values (Ra) of 0.8 microm; differences in roughness between materials were small, but statistically significant. Type of coating had a significant influence on surface quality. Depending on the combination of materials used, the coating produced both smoother and rougher surfaces than polishing (0.4 microm < Ra < 4.6 microm). Five coatings were deemed not to be clinically applicable because of poor wetting properties. Thermal cycling did not significantly influence surface quality, but caused minute cracks in the cyanoacrylate coating.CONCLUSION:
In regard to surface quality and applicability, the use of varnishes on temporary restorations is not advisable.
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Base de dados:
MEDLINE
Assunto principal:
Resinas Acrílicas
/
Coroas
/
Forramento da Cavidade Dentária
/
Polimento Dentário
/
Restauração Dentária Temporária
/
Prótese Parcial Fixa
Limite:
Humans
Idioma:
En
Revista:
J Prosthet Dent
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Alemanha