Selçuk Üniversitesi Diş Hekimliği Fakültesi Dergisi, cilt.9, sa.3, ss.769-776, 2022 (Hakemli Dergi)
Evaluation of Fracture Strength of Different CAD/CAM
Veneers That are Manufactured For Zirconia Cores
Background: The purpose of this study was to evaluate the
fracture resistance of zirconia crowns veneered with CAD/CAM
fabricated veneers by using simple and anatomic core designs
with different veneering materials and procedures.
Methods: A total of 100 zirconia frameworks were fabricated with
an anatomic core design or simple core design. The frameworks
were then divided into five subgroups according to the following
veneering procedures: Control (layering), cemented CAD/CAM
fabricated feldspathic veneer, cemented CAD/CAM fabricated
lithium disilicate veneer, fused CAD/CAM fabricated feldspathic
veneer, and fused CAD/CAM fabricated lithium disilicate veneer.
Next, 250000 cycles were applied with an occlusal load of 50 N at
1.6 Hz in a chewing simulator, and a thermal cycle was applied
during loading (5°C to 50°C every 60 s). The crowns were then
subjected to a single load failure test by using a universal test
machine.
Results: Statistical analyses between the groups showed
significant differences (F= 23.296; p<0,001). The lowest fracture
resistance values were observed in fused feldspathic CAD/CAM
veneers with an anatomic core design (470.63 N). The highest
fracture resistance was obtained in cemented lithium disilicate
CAD/CAM veneers with a simple core design (2075.06 N).
Conclusion: Within the limitations of this study, it can be said that
the use of CAD/CAM fabricated veneers can be an alternative to
layering when their advantages are considered.