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Shear Bond Strength Comparison between Conventional Dental Nano Zirconia Combinations and New Functionally Graded Nano Zirconia Combinations after Thermal-Mechanical Cycling

100%
Sun T., Lai R., Liu R., Shao L.
Acta Physica Polonica A
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2014
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vol. 125
|
issue 2
238-240
EN
The aim of the study was to evaluate the core-veneer bond strength of graded zirconia combinations and compared those to conventional zirconia combinations after thermal and mechanical tests. Conventional zirconia-veneer combinations and graded zirconia-veneer combinations were made into cylinders. Prior to shear bond testing, half of each group was subjected to thermal and mechanical cycling testing at three conditional levels. All specimens were thereafter subjected to a shear force. The fractured surfaces were visually analyzed with scanning electron microscopy. The shear bond strength values of functionally graded zirconia combinations were significantly higher than zirconia combinations, irrespective of the fatigue conditions (P < 0.05). The shear bond strength values of graded zirconia combinations and zirconia combinations before thermal-mechanical cycling were higher than after (P < 0.05). The shear bond strength values of graded zirconia combinations was 40.99 ± 2.22 MPa, 39.44 ± 2.36 MPa, 37.45 ± 2.06 MPa, and 36.87 ± 2.18 MPa for conditions 0 to 3, respectively. The shear bond strength values were 26.75 ± 2.16 MPa, 23.95 ± 2.16 MPa, 21.65 ± 2.14 MPa, and 20.49 ± 2.16 MPa for zirconia combinations from conditions 0 to 3, respectively. The functionally graded zirconia combinations exhibited greater shear bond strength than zirconia combinations, irrespective of the fatigue conditions. Thermal-mechanical cycling had an impact on the shear bond strength of both graded zirconia combinations and conventional zirconia combinations.
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The Antibacterial Activities of Ag/Nano-TiO_2 Modified Silicone Elastomer

100%
Wang L., Sun T., Zhou S., Shao L.
Acta Physica Polonica A
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2014
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vol. 125
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issue 2
248-250
EN
We studied the ability of Ag/nano-TiO_2 to inhibit Staphylococcus aureus growth on silicone elastomer material. Ag/nano-TiO_2 silicone elastomer was prepared with different concentrations of 0%, 2%, 4%, 6%, 8%, 10%. The antibacterial efficacy of Ag/nano-TiO_2 silicone elastomer was determined by the inhibition zone method and the impregnated culture method. The antibacterial timeliness of Ag/nano-TiO_2 silicone elastomer was tested by direct contact method. The samples were kept through thermal aging process in an accelerated aging chamber. The effect of concentrations of Ag/nano-TiO_2 was insignificant (P < 0.05). There was significant difference between the Ag/nano-TiO_2 silicone elastomer and the blank silicone elastomer (P < 0.5). There was also significant difference among specimen groups whose aging periods were 50°C, 100°C, 150°C, 200°C for 87 h (P < 0.5). The silicone elastomer with different concentrations of Ag/nano-TiO_2 effectively inhibits Staphylococcus aureus growth.
3
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The Influence of Different Resin Cements and Pretreatments on the Bond Strength between Zirconia and Cement

100%
Sun T., Hu C., Wang L., Shao L.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 2
313-315
EN
The aim of this study was to analyze the influence of various luting materials and surface treatments on adhesive strength for zirconia ceramics and luting cements. The zirconia framework specimens were made into cylinders. Prior to cement, zirconia framework specimens underwent various surface treatments (sandblasting with 110 μm Al_2O_3 particles, milling with 240-grift silicon sand paper and silanization). Resin luting cement and glass ionomer luting cement were then applied on the surface of zirconia specimens. The specimens were then subjected to a shear force. The fractured surfaces were visually analyzed by scanning electron microscopy. The shear bond strength values of resin luting cement bonded to zirconia specimens were significantly higher than glass ionomer luting cement bonded to zirconia specimens (P < 0.05). The shear bond strength values of zirconia specimens sandblasted with 110 μm Al_2O_3 particles were significantly higher than those milled with silicon carbide papers and underwent silanization (P < 0.05). The shear bond strength values of zirconia specimens milled with silicon carbide papers and underwent silanization were not significantly different (P < 0.05). The highest shear bond strength values were achieved when the zirconia specimens were sandblasted and bonded to resin luting cement. Airborne-particle abrasion was an effective method which could enhance the bond strength of zirconia ceramics and cements. The resin luting cement exhibited a higher bond to zirconia than glass ionomer luting cement.
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