Research and EducationMechanical properties and internal fit of 4 CAD-CAM block materials
Section snippets
Material and Methods
The 4 materials tested in this study and their compositions are listed in Table 1. The IPS e.max CAD specimens used in this study were not fritted. Flexural strength and modulus evaluation were done according to International Organization for Standardization (ISO) standard 6872.30 Bar-shaped specimens (18×3×3 mm; n=16) were subjected to a 3-point bend test, using a universal testing machine at a cross-head speed of 0.5 mm/min. The flexural strength was calculated in megapascals (MPa) from the
Results
Results for the flexural strength, flexural modulus, fracture toughness, and Vickers hardness are presented in Figure 1, Figure 2, Figure 3, Figure 4. Cerasmart (216.5 ±28 MPa) and IPS e.max CAD (210.2 ±14 MPa) have significantly higher flexural strength results than Lava Ultimate or Vita Enamic (P<.05). The highest flexural modulus values were for IPS e.max CAD (52.8 ±10.5 GPa), which was significantly higher than the other materials tested (P<.05). The lowest Vickers hardness values were for
Discussion
This study investigated the mechanical properties of a dense ceramic, a PICN material, and 2 composite resin nanoceramic blocks. Additionally, the internal adaptation of MOD inlays prepared from these materials was evaluated. Correlation between the mechanical properties and the machinability of each of these block materials was investigated.
The IPS e.max CAD specimens were not fritted, because the main purpose was to evaluate the impact of mechanical properties on its machinability, which
Conclusions
Within the limitations of this in vitro study, the following conclusions were drawn:
- 1.
The mean flexural strength of Cerasmart and IPS e.max CAD was significantly higher than that of Lava Ultimate or Vita Enamic.
- 2.
The mean flexural modulus and Vickers hardness of IPS e.max CAD were significantly higher than those of Cerasmart, Lava Ultimate or Vita Enamic.
- 3.
The mean fracture toughness of IPS e.max CAD and Lava Ultimate was significantly higher than that of Vita Enamic or Cerasmart.
- 4.
The mechanical
Acknowledgments
The authors thank L. Viriot and B. Thivichon, Institute of Functional Genomics Lyon (UMR CNRS 5242), for assistance with stereomicroscopy and imaging studies and L. Scalone for the English language verification.
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Supported by GC Europe, Ivoclar Vivadent AG, Vita Zahnfabrik, and 3M ESPE.