Mechanical properties and internal fit of 4 CAD-CAM block materials

Autor: Brigitte Grosgogeat, Dominique Seux, Christophe Jeannin, Pierre Colon, Alexis Goujat, Nelly Pradelle, Hazem Abouelleil
Přispěvatelé: Laboratoire des Multimatériaux et Interfaces (LMI), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, UFR d’Odontologie, Université de Lyon, Laboratoire d'Etude des Interfaces et des biofilms en Odontologie, Hospices Civils de Lyon (HCL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Garanciere Rothschild Hospital, AP HP, Dept Periodontol, Service Odontologie, Garanciere Rothschild Hospital
Rok vydání: 2016
Předmět:
Zdroj: The Journal of Prosthetic Dentistry
The Journal of Prosthetic Dentistry, 2018, 119 (3), pp.384-389. ⟨10.1016/j.prosdent.2017.03.001⟩
The Journal of Prosthetic Dentistry, 2018, ⟨10.1016/j.prosdent.2017.03.001⟩
ISSN: 1097-6841
0022-3913
DOI: 10.1016/j.prosdent.2017.03.001⟩
Popis: International audience; Statement of problemRecent polymer-based computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials have been commercialized for inlay restorations, a polymer-infiltrated ceramic-network (PICN) and composite resin nanoceramics. Little independent evidence regarding their mechanical properties exists. Internal adaptation is an important factor for the clinical success and longevity of a restoration, and data concerning this parameter for inlays made with these blocks are scarce.PurposeThe purpose of this in vitro study was to evaluate and compare the mechanical properties (flexural strength, flexural modulus, Vickers hardness, fracture toughness) and the internal adaptation of these recent polymer-based blocks with a lithium disilicate glass-ceramic block.Material and methodsThe materials tested in this study were a PICN material (Vita Enamic), 2 composite resin nanoceramics (Lava Ultimate; 3M ESPE and Cerasmart; GCDental Products), and a lithium disilicate glass-ceramic (IPS e.max CAD). Mechanical properties were evaluated according to ISO norm DIS 6872:2013. Bar-shaped specimens (18×3×3 mm) were prepared and submitted to a 3-point bend test using a universal testing machine at a cross-head speed of 0.5 mm/min. In addition, identical cavities were prepared in 60 human mandibular extracted molars (n=15) and optically scanned to receive mesioocclusodistal inlays milled with the 4 materials tested in a CEREC Inlab milling machine. The replica technique and a stereomicroscope (×20) were used to measure the internal fit of the inlays at 9 preselected locations. All data were statistically analyzed using 1-way ANOVA and the post hoc Tukey multiple comparison or Games-Howell test (α=.05).ResultsThe mean flexural strength of the tested blocks ranged from 148.7 ±9.5 MPa (Vita Enamic) to 216.5 ±28.3 MPa (Cerasmart). The mean flexural modulus ranged from 23.3 ±6.4 GPa (Vita Enamic) to 52.8 ±10.5 GPa (IPS e.max CAD). The mean Vickers hardness ranged from 0.66 ±0.02 GPa (Cerasmart) to 5.98 ±0.69 GPa (IPS e.max CAD). The mean fracture toughness ranged from 1.2 ±0.17 MPa.m1/2 (Cerasmart) to 1.8 ±0.29 MPa.m1/2 (IPS e.max CAD). The values for internal discrepancy ranged from 119 ±55 μm to 234 ±51 μm. The mean internal discrepancy was significantly higher for Lava Ultimate (P
Databáze: OpenAIRE
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