Mechanical properties and microstructures of glass-ionomer cements.

摘要: Abstract Objective: The objective of this study was to determine the flexural strength (FS), compressive (CS), diametral tensile (DTS), Knoop hardness (KHN) and wear resistance ten commercial glass-ionomer cements (GICs). fracture surfaces these were examined using scanning electron microscopic (SEM) techniques ascertain relationships between mechanical properties microstructures cements. Methods: Specimens fabricated according instructions from each manufacturer. FS, CS, DTS, KHN rate measured after conditioning specimens for 7 d in distilled water at 37°C. One-way analysis variance with post hoc Tukey–Kramer multiple range test used which specimen groups significantly different test. surface one representative GIC FS tests a microscope. Results: resin-modified GICs (RM GICs) exhibited much higher not generally often lower resistance, compared conventional (C GICs). Vitremer (3M) had highest values DTS; Fuji II LC (GC International) Ketac-Molar (ESPE) CS; Ketac-Fil KHN. Ketac-Bond lowest FS; α-Silver (DMG-Hamburg) CS. Four (α-Fil (DMG-Hamburg), α-Silver, II) other; Ketac-Silver by Ketac-Fil; F2LC resistance. C brittle behavior, whereas RM underwent substantial plastic deformation compression. more integrated microstructure, DTS. Higher CS correlated smaller glass particles, found where there combination particles porosity. Larger particle sizes microstructure contributed Significance: closely related their microstructures. Factors such as integrity interface polymer matrix, size, number size voids have important roles determining properties.