Comparative Evaluation of Compressive and Diametral Tensile Strength in Die Stone Reinforced With Different Types of Nanoparticles: An In Vitro Study

Abstract

Aim: To investigate the effect of different types of nanoparticles on the compressive strength (CS) and diametral tensile strength (DTS) of type IV dental stones. Materials and methods: A total of 100 specimens were made from the mould for all five groups. Four commercially available nanoparticles (aluminium oxide (Al 2 O 3 ), silicon dioxide (SiO 2 ), zinc oxide (ZnO), and zirconium oxide (ZrO 2 )) were used in this study in a concentration of 10%. CS and DTS tests were performed in a universal test machine. The data were statistically analysed using ANOVA and Student's t-test. Results: The interaction between nanoparticles and the type of dental stone was found to be statistically significant (p < 0.05). CS and DTS values decreased by adding all four nanoparticles. The lowest CS and DTS were observed in 10% ZnO nanoparticles when added to type IV dental stone. Conclusion: It was concluded that the addition of nanoparticles (Al 2 O 3 , SiO 2 , ZnO, and ZrO 2 ) to die stone significantly decreased the CS and DTS for all groups. Among all groups, the incorporation of 10% ZrO 2 nanoparticles (group E) to die stone showed significantly less decrease in CS and DTS compared to Al 2 O 3 , SiO 2 , and ZnO. Incorporation of ZnO nanoparticles, on the other hand, showed a significantly more amount of decrease in the CS and DTS compared to Al 2 O 3 , SiO 2 , and ZrO 2 .

Análisis In vitro de yesos dentales de alta resistencia y baja expansión disponibles en Perú

“…La diferencia entre los resultados de los yesos analizados se debe a que los fabricantes impregnan polímeros, agentes humectantes y endurecedores en el yeso 15,21 . Otro factor que puede haber influenciado es el proceso de mezcla yeso/agua, un estudio afirma que la mezcla mecánica al vacío resulta ventajosa en relación a la dureza, porque se reduce la porosidad 19 , en contraposición, otro estudio concluyó que la mezcla mecánica al vacío no produce un incremento significativo en la dureza 21 .…”

“…La selección del tipo de yeso para la obtención de modelos dentales finales se debe principalmente a las propiedades, de microdureza superficial para resistir al rayado durante la preparación de la restauración final, la resistencia a la compresión para resistir la fuerza de manipulación durante los pasos de laboratorio y la estabilidad dimensional para mantener inalterable sus medidas tridimensionales a lo largo del tiempo [12][13][14] , los yesos dentales tipo IV son los indicados para este fin 7,9,10,15 .…”