Diametral tensile and compressive strengths of several types of core materials.
OBJECTIVE
Compressive and diametral tensile strengths (DTSs) of core materials are thought to be important, because cores usually replace a large bulk of tooth structure and should provide sufficient strength to resist intraoral tensile and compressive forces. This study was undertaken to compare the mechanical properties of materials used for direct core foundations.


METHODS
The differences between the compressive and DTSs of six core materials, including Duralloy (high-copper amalgam), Grandio (visible light-cured nanohybrid resin composite), Admira (organically modified ceramic), Filtek P60 (packable composite resin), Rebilda DC (dual-cure adhesive core material), and Argion Molar (silver-reinforced glass ionomer cement), were tested. A total of 120 specimens, half for the compressive strength (CS) test (6 mm in height, 4 mm in diameter) and the other half for the DTS test (6 mm in diameter, 3 mm in thickness), were prepared. The specimens were stored at room temperature in distilled water for 7 days. The Lloyd testing machine was used to load the specimens at a crosshead speed 0.5 cm/min, and the strength values were determined in MPa.


RESULTS
The compressive and DTS test values (in MPa), respectively, of the materials were: Admira (361, 44); Filtek P60 (331, 55); Grandio (294, 53); Rebilda DC (279, 42); Duralloy (184, 40); and Argion Molar (107, 9). Kruskal-Wallis test was computed, and multiple comparisons test discerned many differences among materials (p < 0.05).


CONCLUSIONS
Packable composite resin (Filtek P60), visible light cured nanohybrid resin composite (Grandio), and organically-modified ceramic (Admira) had higher compressive and DTS values than the other materials.
Yüzügüllü
Bulem
B
Postdoctoral Resident, Department of Prosthodontics, Faculty of Dentistry, Başkent University, Ankara, TurkeyAssociate Professor, Private Practice, Ankara, TurkeyProfessor, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Çiftçi
Yalçnı
Y
Postdoctoral Resident, Department of Prosthodontics, Faculty of Dentistry, Başkent University, Ankara, TurkeyAssociate Professor, Private Practice, Ankara, TurkeyProfessor, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Saygılı
Gülbin
G
Postdoctoral Resident, Department of Prosthodontics, Faculty of Dentistry, Başkent University, Ankara, TurkeyAssociate Professor, Private Practice, Ankara, TurkeyProfessor, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Canay
Şenay
Ş
Postdoctoral Resident, Department of Prosthodontics, Faculty of Dentistry, Başkent University, Ankara, TurkeyAssociate Professor, Private Practice, Ankara, TurkeyProfessor, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D019245:Compressive Strength; D003300:Copper / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D011176:Post and Core Technique; D012833:Siloxanes / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D014867:Water / Q000737:chemistry
D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C438835:Filtek P60 Composite Resin; D005899:Glass Ionomer Cements; C509998:Grandio; D008689:Methacrylates; D012833:Siloxanes; C479084:admira; C448320:argion; C529053:rebilda DC; D014867:Water; C072650:Duralloy; D012834:Silver; D003300:Copper