Bending strength of Fuji and Ketac glass ionomers after sonication.
Glass ionomer cements mixed by conventional methods contain voids that can decrease their overall strength. This study evaluated the effect of sonication on the reduction of air entrapment by measuring the bending strength in glass ionomer cements (Fujj-II and Ketac-fil). Glass ionomer cement was placed in identical-test vials and sonicated for 45s, 10s, or 0s. The bending strengths were measured (0.005 in min-1) after setting times of 1 or 2 weeks. Mean bending strengths (MPa +/- SD) for the 12 treatment both cements (P < 0.001) and sonication times (P < 0.001). The effect of setting time produced minimal increases in bending strength (P < 0.218). The sonication of freshly mixed glass ionomer cements is a possible solution for reducing voids to increase bending strength.
Arcoria
C J
CJ
Department of Operative Dentistry, Baylor College of Dentistry, Dallas, Texas 75246.
Butler
J R
JR
Wagner
M J
MJ
Vitasek
B A
BA
D000704:Analysis of Variance; D004548:Elasticity; D005899:Glass Ionomer Cements / Q000138:chemical synthesis / Q000737:chemistry*; D008298:Maleates / Q000138:chemical synthesis / Q000737:chemistry*; D008422:Materials Testing; D016062:Porosity; D013010:Sonication / Q000295:instrumentation; D013718:Tensile Strength; D014783:Viscosity
D005899:Glass Ionomer Cements; D008298:Maleates; C037885:Fuji-ionomer; C040964:Ketac-Fil