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H Nagem Filho

Publications and source records attributed to H Nagem Filho.

14 recordsLinked to original sources
PubMedDate not supplied

Effect of light curing method on volumetric polymerization shrinkage of resin composites.

Volumetric polymerization shrinkage of three resin composites (Suprafil, Z100 and Filtek P60) was determined using four light curing methods: method 1: continuous output with conventional intensity light; method 2: continuous output with higher intensity light; method 3: ramp output and method 4: pulse-delay output. Five disc-shaped specimens were prepared from each material for each curing method. Specimen weight was determined with an analytical electronic hydrostatic balance in air and in water before and after curing. Specific gravity values were then determined. Volumetric polymerization shrinkage was calculated using mathematical formulas. Mean volumetric polymerization shrinkage ranged from 1.882 (.015)% to 2.169 (.028)%. ANOVA indicated significant differences among the materials (p<.05). Light curing methods had no effect on volumetric polymerization shrinkage except for Z-100, where method 2 resulted in significantly higher shrinkage than methods 1 and 4. Suprafil shrunk significantly less than the other two materials in all curing methods.

Analysis of Variance↗
PubMedDate not supplied

[Percentage of gamma-2 phase in high copper amalgam].

In order to quantify the gamma-2 phase utilizing Kropp's colorimetrical method, at periods of 1 hour, 12 hours, 48 hours and 1 week, five Cu-rich amalgm alloys were studied. Results pointed out a progressive decrease of gamma-2 along these periods, in all cases; this content was always monor to spheroidal particles alloys, increasing to dispersion type and even more to fillings type.

Colorimetry↗