Roughness and porosity of provisional crowns
RPG rev. pos-grad
; 18(2): 108-112, abr.-jun. 2011. ilus, graf
Article
in En
| LILACS
| ID: lil-679849
Responsible library:
BR501.1
RESUMO
This study aimed at evaluating the surface roughness and porosity of an acrylic resin used for provisional crowns. Six different processing techniques (direct and indirect) were assessed (I) heat-cured acrylic resin under pressure; (II) heat-aided autopolymerizing resin under pressure; (III) autopolymerizing resin under pressure; (IV) bead-brush technique; (V) autopolymerizing resin in sandy stage; (VI) autopolymerizing resin in plastic stage. Twelve specimens were made for each test group. Roughness was evaluated with a rugosimeter, and porequantification was performed using a stereoscopic magnifying lens. The highest mean surface roughness (Ra = 0.908 mm) was measured for Group VI. The lowest surface roughness value (Ra = 0.141 mm) was determined for Group I. Significant differences in mean surface roughness were found between direct and indirect techniques. Direct techniques reached the highest roughness and porosity values; its use should be restricted to avoid creating favorable conditions for microorganism proliferation
Key words
Search on Google
Index:
LILACS
Main subject:
Orthodontics
/
Dental Prosthesis
/
Tooth Crown
/
Dental Restoration, Temporary
/
Dentistry
Language:
En
Journal:
RPG rev. pos-grad
Year:
2011
Type:
Article