website: 86th General Session & Exhibition of the IADR

ABSTRACT: 0339  

Mechanical properties of a new core build-up composite resin material

W. KOMADA, Y. FUKUI, H. MIURA, S. OTAKE, and K. YUSA, Tokyo Medical and Dental University, Japan

Objective:

This study evaluated mechanical properties (compressive strengths, Vickers hardness, flexural strength and elastic modulus) of a newly developed composite resin core material [ECQ (prototype) (EC; Tokuyama Dental)], compare with 6 existent core materials.

Method:

Three auto-mixing type core materials [EC, DC Core Automix (DCA; KURARAY MEDICAL), Build-IT FR (BU; Pentron)] were tested and compared with two hand-mixing type core materials [DC Core Paste (DC; KURARAY MEDICAL), Unifil Core (UN; GC)] plus two non-mixing type core materials [i-TFC Post Resin (ITP; SUN MEDICAL), i-TFC Core Resin (ITC; SUN MEDICAL)].Compressive strengths were determined using column-shaped specimens (3 mm in height, 4 mm in diameter) stored in water at 37 °C for 24 hours, using a universal testing machine. Flexural strength and modulus of elasticity were determined using bar-shaped specimens (2 x 2 x 25 mm) stored in water at 37 °C for 24 hours, using a universal testing machine. Vickers hardness was determined using disc-shaped specimens (2 mm in height, 10 mm in diameter), using a micro hardness testing machine. All specimens were manipulated according to the manufacturers' instructions. One-way ANOVA, Dunnett's T3 test and Tukey HSD test were used for the statistical analysis (a=0.05).

Results:

EC showed the highest flexural strength (184.3ą15.1 MPa). DC (135.4ą14.9 MPa) and UN (139.3ą18.6 MPa) showed lower flexural strengths than EC, DCA (161.9ą9.2 MPa) and BU (161.0ą5.7 MPa). ITP showed the lowest elastic modulus (7.3ą0.4GPa). EC (401.2ą13.6 MPa) showed higher compressive strengths than other auto-mixing type core materials [DCA (343.6ą12.2 MPa) and BU (349.7ą9.3 MPa) ]. ITP (19.2ą1.6) showed the lowest Vickers hardness of all composite resin materials.

Conclusion:

This new prototype ECQ showed the higher mechanical strengths than other auto-mixing composite resins.

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