Comparison of three fracture toughness testing techniques using a dental glass and a dental ceramic

Effect of Polymorphism of SiO2 Addition on Mechanical Properties of Feldspathic Porcelains

“…The formula of Anstis et al 11) was used in the present study because it is one of the most popular ones. Flexural strengths and fracture toughnesses of experimental porcelains obtained in the present study except for T-F porcelains were respectively similar to and greater than the reported values of commercial feldspathic porcelains for veneering 17,18) . Regardless of the addition of cristobalite to S-L, no significant differences in flexural strength were observed between the single-phases glasses and two-phase porcelains.…”

“…To evaluate the resistance of each porcelain to crack propagation, the fracture toughness test was employed. There are several methods to determine fracture toughness 18) . The indentation fracture (IF) method for fracture toughness is empirical, but specimen preparation is easy and no special devices are required 19) .…”

Fracture toughness of seven resin composites evaluated by three methods of mode I fracture toughness (<i>K</i>_Ic)

“…Several studies attempted to establish some clinically reliable testing protocols for evaluating the fracture toughness of brittle dental materials [12][13][14][15] . One of the most reported reliable methods is the single edge V-notched beam (SEVNB) which has been used in the ceramics standard, ISO 6872 16) .…”

“…One of the most reported reliable methods is the single edge V-notched beam (SEVNB) which has been used in the ceramics standard, ISO 6872 16) . It has been shown that SEVNB method is a reproducible approach 15) . However, the reported values show a large discrepancy in the fracture toughness values obtained from this method 6,9) ; this could be related to the difficulties in preparing the V-notch that may vary in size and consequently lead to different K Ic values.…”

Sinterização e caracterização mecânica e microestrutural de cerâmicas de SiC aditivadas com misturas de AIN/Dy2O3 e AIN/Yb2O3

“…Os principais métodos existentes atualmente para a determinação de K Ic são listados a seguir: IF (Indentation Fracture -fratura por indentação) (72)(73)(74)(75)(76)(77)(78)(79)(80)(81)(82)(83)(84)(85)(86) , IS (Indentation Strength -resistência à indentação) (74,78,79,83,87) , CNB (Chevron Notch Beam -barra entalhada Chevron) (78,79,84,(87)(88)(89)(90)(91) , SCF (Surface Crack in Flexure -superfície da trinca em flexão) (78,79,83,84,88,89,91) , SEPB (Single Edge…”