Effects of Automated Grit Blasting on Roughness and Thickness Loss of Reaction-Bonded Silicon Carbide

Objective: The aim of this study was to evaluate the resin and initial osteoblastic adhesion of zirconia and titanium implant surfaces grit-blasted with four different sands, namely silica-coated alumina, alumina, silicon carbide and boron carbide. Materials and methods: Titanium and sintered zirconia were polished and grit-blasted with one of the following grits: silica-coated alumina, alumina, silicon carbide and boron carbide. Two study groups were prepared. For the first group, a silane coupling agent and a resin was applied on grit-blasted sample surfaces (n=8), and adhesive strengths of the dental resins to these specimens were evaluated under shear mode in three storage conditions: dry, 24h water aging and thermo-cycled for 6000 cycles. The results were analyzed by using two-way ANOVA test with 0.05 significance level. For the second group, the specimens were immersed in a cell line medium (MC3T3-E1) and the attachment was observed under a confocal microscope after 24 hours. The attached cells were fixed and viewed under an SEM to observe the cell morphology. Results: Surface topography and chemical composition of zirconia and titanium were changed after grit-blasting with four different grits. The specimens grit-blasted with silica-coated alumina or alumina exhibited a significantly higher mean resin adhesive strengths (p<0.05) than other two grits. In addition, SEM and confocal microscopy confirmed the specimens grit-blasted with alumina powder showed the maximum osteoblastic attachment, and revealed the cell morphology. Conclusion: With the limitation of the laboratory study, alumina deemed to be the best grit-blasting material to achieve satisfactory osteoblastic cell and resin adhesions for both titanium and zirconia implant materials .

Download Full-text

Resin and osteoblastic adhesion on zirconia and titanium implant materials blasted with various grits

10.7287/peerj.preprints.1189v2 ◽

2015 ◽

Author(s):

Celine Joyce Cornelius Timothius ◽

Christie YK Lung ◽

Chaminda Jayampath Seneviratne ◽

James KH Tsoi ◽

Jukka P Matinlinna

Keyword(s):

Silicon Carbide ◽

Boron Carbide ◽

Cell Morphology ◽

Titanium Implant ◽

Osteoblastic Cell ◽

Shear Mode ◽

Alumina Powder ◽

Grit Blasting ◽

Implant Materials ◽

Dental Resins

Objective: The aim of this study was to evaluate the resin and initial osteoblastic adhesion of zirconia and titanium implant surfaces grit-blasted with four different sands, namely silica-coated alumina, alumina, silicon carbide and boron carbide. Materials and methods: Titanium and sintered zirconia were polished and grit-blasted with one of the following grits: silica-coated alumina, alumina, silicon carbide and boron carbide. Two study groups were prepared. For the first group, a silane coupling agent and a resin was applied on grit-blasted sample surfaces (n=8), and adhesive strengths of the dental resins to these specimens were evaluated under shear mode in three storage conditions: dry, 24h water aging and thermo-cycled for 6000 cycles. The results were analyzed by using two-way ANOVA test with 0.05 significance level. For the second group, the specimens were immersed in a cell line medium (MC3T3-E1) and the attachment was observed under a confocal microscope after 24 hours. The attached cells were fixed and viewed under an SEM to observe the cell morphology. Results: Surface topography and chemical composition of zirconia and titanium were changed after grit-blasting with four different grits. The specimens grit-blasted with silica-coated alumina or alumina exhibited a significantly higher mean resin adhesive strengths (p<0.05) than other two grits. In addition, SEM and confocal microscopy confirmed the specimens grit-blasted with alumina powder showed the maximum osteoblastic attachment, and revealed the cell morphology. Conclusion: With the limitation of the laboratory study, alumina deemed to be the best grit-blasting material to achieve satisfactory osteoblastic cell and resin adhesions for both titanium and zirconia implant materials .

Download Full-text

Resin and osteoblastic adhesion on zirconia and titanium implant materials blasted with various grits

10.7287/peerj.preprints.1189v1 ◽

2015 ◽

Author(s):

Celine Joyce Cornelius Timothius ◽

Christie YK Lung ◽

Chaminda Jayampath Seneviratne ◽

James KH Tsoi ◽

Jukka P Matinlinna

Keyword(s):

Silicon Carbide ◽

Boron Carbide ◽

Cell Morphology ◽

Titanium Implant ◽

Osteoblastic Cell ◽

Shear Mode ◽

Alumina Powder ◽

Grit Blasting ◽

Implant Materials ◽

Dental Resins

Objective: The aim of this study was to evaluate the resin and initial osteoblastic adhesion of zirconia and titanium implant surfaces grit-blasted with four different sands, namely silica-coated alumina, alumina, silicon carbide and boron carbide. Materials and methods: Titanium (Permascand, Ljungaverk, Sweden) of size 20 mm × 40 mm × 1 mm and sintered zirconia (3M ESPE, Lava™ Frame, St. Paul, MN, USA) of size 9 mm × 12 mm × 3 mm specimens were polished and grit-blasted with one of the following grits: silica-coated alumina, alumina, silicon carbide and boron carbide. Two study groups were prepared. For the first group, a silane coupling agent and a resin was applied on grit-blasted sample surfaces (n=8), and adhesive strengths of the dental resins to these specimens were evaluated under shear mode in three storage conditions: dry, 24h water aging and thermo-cycled for 6000 cycles. The results were analyzed by using two-way ANOVA test with 0.05 significance level. For the second group, the specimens were immersed in a cell line medium (MC3T3-E1) and the attachment was observed under a confocal microscope after 24 hours. The attached cells were fixed and viewed under an SEM to observe the cell morphology. Results: Surface topography and chemical composition of zirconia and titanium were changed after grit-blasting with four different grits. The specimens grit-blasted with silica-coated alumina or alumina exhibited a significantly higher mean resin adhesive strengths (p<0.05) than other two grits. In addition, SEM and confocal microscopy confirmed the specimens grit-blasted with alumina powder showed the maximum osteoblastic attachment, and revealed the cell morphology. Conclusion: With the limitation of the laboratory study, alumina deemed to be the best grit-blasting material to achieve satisfactory osteoblastic cell and resin adhesions for both titanium and zirconia implant materials .

Download Full-text

Irradiation behavior of pyrolytic silicon carbide

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074288 ◽

1983 ◽

Vol 41 ◽

pp. 72-73

Author(s):

R. J. Lauf

Keyword(s):

Silicon Carbide ◽

Fission Products ◽

Thermodynamics And Kinetics ◽

Neutron Fluences ◽

Fuel Particles ◽

Sic Coatings ◽

Irradiation Behavior ◽

Kinetics Of ◽

Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

Download Full-text

Microstructural Evaluation of Silicon Carbide Whisker Reinforced Alumina Fabricated with Carbon-Coated Whiskers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100088919 ◽

1991 ◽

Vol 49 ◽

pp. 920-921

Author(s):

K. B. Alexander ◽

P. F. Becher

Keyword(s):

Silicon Carbide ◽

High Resolution Electron Microscopy ◽

Ceramic Composites ◽

Interface Debonding ◽

Resolution Electron ◽

Microstructural Evaluation ◽

Carbon Coated ◽

Electron Energy Loss ◽

Interfacial Films ◽

Debonding Process

The presence of interfacial films at the whisker-matrix interface can significantly influence the fracture toughness of ceramic composites. The film may alter the interface debonding process though changes in either the interfacial fracture energy or the residual stress at the interface. In addition, the films may affect the whisker pullout process through the frictional sliding coefficients or the extent of mechanical interlocking of the interface due to the whisker surface topography.Composites containing ACMC silicon carbide whiskers (SiCw) which had been coated with 5-10 nm of carbon and Tokai whiskers coated with 2 nm of carbon have been examined. High resolution electron microscopy (HREM) images of the interface were obtained with a JEOL 4000EX electron microscope. The whisker geometry used for HREM imaging is described in Reference 2. High spatial resolution (< 2-nm-diameter probe) parallel-collection electron energy loss spectroscopy (PEELS) measurements were obtained with a Philips EM400T/FEG microscope equipped with a Gatan Model 666 spectrometer.

Download Full-text

TEM of grain growth and phase transformations during creep of SCS-6 silicon carbide fibers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100138129 ◽

1995 ◽

Vol 53 ◽

pp. 350-351

Author(s):

L. A. Giannuzzi ◽

C. A. Lewinsohn ◽

C. E. Bakis ◽

R. E. Tressler

Keyword(s):

Silicon Carbide ◽

Creep Rate ◽

Vapor Deposition ◽

Chemical Vapor ◽

Primary Creep ◽

Excess Carbon ◽

Silicon Carbide Fibers ◽

Sic Fiber ◽

Carbon Core ◽

Grain Width

The SCS-6 SiC fiber is a 142 μm diameter fiber consisting of four distinct regions of βSiC. These SiC regions vary in excess carbon content ranging from 10 a/o down to 5 a/o in the SiC1 through SiC3 region. The SiC4 region is stoichiometric. The SiC sub-grains in all regions grow radially outward from the carbon core of the fiber during the chemical vapor deposition processing of these fibers. In general, the sub-grain width changes from 50nm to 250nm while maintaining an aspect ratio of ~10:1 from the SiC1 through the SiC4 regions. In addition, the SiC shows a <110> texture, i.e., the {111} planes lie ±15° along the fiber axes. Previous has shown that the SCS-6 fiber (as well as the SCS-9 and the developmental SCS-50 μm fiber) undergoes primary creep (i.e., the creep rate constantly decreases as a function of time) throughout the lifetime of the creep test.

Download Full-text