Effect of grain size of dental zirconia on shear bond strength of composite resin cement.
JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS(2020)
摘要
The effect of grain size of dental zirconia on the shear bond strength of composite resin cement was newly studied. Disc-shaped dental zirconia with small (sample S) and large (sample L) grains were made by sintering of pre-sintered dental zirconia at 1450 degrees C for 0.5 h and 40 h, respectively. After the sintering, the average grain size of sample S was 1.37 +/- 0.15 mu m, while that of sample L was 3.74 +/- 0.50 mu m. The sintered discs were successively polished with different grades of diamond and alumina slurries. The interfacial free energies were 63.5 +/- 4.2 dyne/cm for sample S and 52.1 +/- 5.5 dyne/cm for sample L. Stainless steel cylinders, previously sandblasted with 50 mu m alumina powder, were bonded to the zirconia discs using composite resin cement. Next, samples were kept in an oven for 7 d at 36.5 degrees C. The shear bond strength of sample S was 23.0 +/- 4.5 MPa while that of sample L was 17.5 +/- 4.6 MPa. After the fracture, the areal % values of composite resin cement remaining on the zirconia surfaces were 89.7 +/- 5.9% for sample S and 61.6 +/- 5.5% for sample L. The results suggest that grain size reduction has a potential to enhance the degree of bonding between a composite resin cement and a dental zirconia due to the increase of interfacial free energy.
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关键词
Dental zirconia,composite resin cement,grain size,interfacial free energy,shear bond strength
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