Influence of ultrasonic setting on compressive and diametral tensile strengths of glass ionomer cements

Abstract

The aim of this study was to assess the influence of ultrasonic wave propagation on the compressive (CS) and diametral tensile (DTS) strengths of glass ionomer cements (GICs). Three variables were evaluated: conventional GICs, ultrasonic excitation and storage time (1 hour, 24 hours and 7 days). Bovine teeth molds were used for simulating a clinical ultrasonic excitation. The data were submitted to three-way ANOVA and Tukey tests (P < 0.05). All the tested conventional GICs presented an increase in strength from 1 hour to 7 days for CS and DTS. Ultrasonic excitation resulted in a statistically significant increase in the CS, but showed no statistically significant difference in the DTS. Regardless the GICs tested the increase in strength was maturation time-dependent for all groups.

Effect of Radiant Heat and Ultrasound on Fluoride Release and Surface Hardness of Glass Ionomer Cements

“…Two methods have been used for this purpose: the application of ultrasonic waves, and the application of radiant heat from a dental light-curing unit. Regarding these methods, previous studies reported improved early mechanical properties (11, 12), enhanced resistance to water degradation and better adaptation to cavity walls (13).…”

The effect of various mixing techniques on the surface microhardness of mineral trioxide aggregate

“…Indeed, ultrasonic energy has been used to enhance the mechanical properties of materials, such as compressive strength (Kleverlaan et al. 2004, Barata et al. 2008), tensile bond strength (Algera et al.…”

“…Ultrasonic vibration has a dispersing effect on the particles of the material, which frequently cluster together. Indeed, ultrasonic energy has been used to enhance the mechanical properties of materials, such as compressive strength (Kleverlaan et al 2004, Barata et al 2008, tensile bond strength (Algera et al 2005, Fagundes et al 2006, hardness (Towler et al 2001) and fill density (Yeung et al 2006). Ultrasonic energy might also increase the total reactive surface area, improve particle interaction and decrease setting time (Kleverlaan et al 2004, Algera et al 2005).…”

Effects of Various Mixing Techniques on Push-out Bond Strengths of White Mineral Trioxide Aggregate

“…Ultrasonic vibration has a dispersing effect on the particles of the material, which frequently cluster together. In fact, ultrasonic energy has been used to enhance the mechanical properties of materials such as compressive strength (24,25), tensile bond strength (26,27), hardness (28), and fill density (29). Ultrasonic energy might also increase the total reactive surface area, improve particle interaction, and decrease setting time (24,27).…”