Effect of ultrasonic ecxitation on the ultimate tensili strength of glass ionomer cements after different water storage times

• Autor(a) principal: Azevedo, Elcilaine [UNESP]
• Data de Publicação: 2012
• Outros Autores: Coldebella, Carmen Regina, Souza, Juliana F. [UNESP], Zuanon, Angela Cristina Cilense [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.revodontolunesp.com.br/article/51ae4aab1ef1faca3d003c1b; http://hdl.handle.net/11449/125458
• topic: Glass ionomer cements; Ultrasonics; Tensile strength; Cimentos de ionômero de vidro; Ultrassom; Resistência à tração

The application of ultrasound waves with a conventional dental ultrasonic scaler on glass ionomer cements surface accelerated initial setting reaction and improved the mechanical properties. Objective: This study evaluated the ultimate tensile strength of glass ionomer cements after ultrasonic excitation and different water storage times. Material and method: Twelve specimens of each material (Fuji IX GP, Ketac Molar Easymix and Vitremer) were prepared, and six of each received a 30-second ultrasound application during initial setting of the cements. After storage of the 24 hours or 30 days, the specimens were sectioned into stick to microtensile testing and the mean ultimate tensile strength values were submitted to Welch’s ANOVA and Tamhane’s test. Result: The results showed that the Vitremer presented the highest mean tensile strength. The chemically set Fuji IX GP presented significantly higher mean tensile strength after 30 days than after 24 hours of storage (p < 0.05). At 24 hours, the ultrasonically set Fuji IX GP presented significantly higher mean tensile strength than their counterparts set under standard conditions (p < 0.05). Conclusion: Treatment with ultrasound increased the tensile strength of Fuji IX GP in the early period of maturation.