Effect of the polishing technique at low or high speed on the micro-hardness of dental amalgam.
Dental cavities were prepared and restored with amalgam, using three different silver alloys. The surface of the restorations was finished 24 hours after condensation, with a rotatory instrument using a low- or high-speed handpiece. The specimens were then submitted to metallographic polishing and one of the margins of the amalgam restoration were then submitted to Vickers' micro-hardness test. Another micro-hardness test was accomplished 168 hours after condensation and the two sets of micro-hardness values were compared. No significant statistical differences were detected between the micro-hardness values obtained with low or high speed in the polishing technique.
Pedigoni
M de L
Mde L
Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo.
Centola
A L
AL
Froner
I C
IC
Turbino
M L
ML
Ribeiro
S A
SA
D003723:Dental Amalgam; D003755:Dental High-Speed Technique; D003775:Dental Polishing / Q000379:methods*; D006244:Hardness; D006245:Hardness Tests; D006801:Humans
D003723:Dental Amalgam