Effect of mixing speed on mechanical properties of encapsulated glass-ionomer cements.
It is well established that the strength of encapsulated dental amalgam is affected by the speed of mixing. An investigation into the effects of mixing speeds on the compressive strength of three encapsulated glass-ionomer cements was carried out. The working and setting time and compressive strength at 24 hours and 7 days were evaluated for the three materials at four mixing speeds. There appeared to be little variation in working and setting times at the different mixing speeds. The early compressive strength of one material, Ketac-fil, increased as the speed of mixing increased. The variation in mixing speed did not appear to affect the early compressive strengths of the other two materials. Seven-day compressive strengths of all three materials were not affected by variations in mixing time.
Gee
D
D
Department of Biomaterials Science, Institute of Dental Surgery, London.
Pearson
G J
GJ
D000538:Aluminum Silicates / Q000138:chemical synthesis / Q000737:chemistry; D004339:Drug Compounding; D005899:Glass Ionomer Cements / Q000138:chemical synthesis* / Q000737:chemistry; D008298:Maleates / Q000138:chemical synthesis / Q000737:chemistry; D008422:Materials Testing; D013718:Tensile Strength; D013997:Time Factors
D000538:Aluminum Silicates; D005899:Glass Ionomer Cements; D008298:Maleates; C078768:Opusfil; C039733:Chemfil; C040964:Ketac-Fil