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

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 11; no. 1; pp. 57 - 61
• Main Authors: Barata, Terezinha Jesus Esteves, Bresciani, Eduardo, Adachi, Akimi, Fagundes, Ticiane Cestari, Carvalho, Carlos Augusto Ramos, Navarro, Maria Fidela Lima
• Format: Journal Article
• Language: English; Portuguese
• Published: ABM, ABC, ABPol 01.03.2008; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: compressive strength; diametral tensile strength; ENGINEERING, CHEMICAL; glass ionomer cements; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; ultrasonic setting; compressive strength; glass ionomer cements; diametral tensile strength; ultrasonic setting
• ISSN: 1516-1439; 1980-5373; 1516-1439
• DOI: 10.1590/S1516-14392008000100011

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.