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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Particle Size on New Bone Formation In Vivo Using Calcium Phopshate Glass (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 165-168 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The purpose of this study was to compare the bone regenerative effect of calciumphosphate glass according to the particle size in vivo. We prepared two different sizes, that is 400μm and 40 μm, of calcium phosphate glass powder using the system CaO-CaF2-P2O5-MgO-ZnO.Critical-sized calvarial defects were created in 60 male Sprague-Dawley rats. The animals weredivided into 3 groups of 20 animals each. Each defect was filled with a constant weight of 0.5 gcalcium phosphate glass powder mixed with saline. As controls, the defect was left empty. The ratswere sacrificed 2 or 8 weeks after postsurgery, and the results were evaluated using histological aswell as histomorphometrical studies. The particle size of the calcium phosphate was crucial; 400μm particles promoted new bone formation, while 40 μm particles inhibited it because of severeinflammation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.165.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Antibacterial Effect of Silver-Zeolites in Glass-Ionomer Cements (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 831-834 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, the antibacterial effects of glass ionomer cement containing silver-zeolitewere evaluated. New antibacterial glass ionomer cements with silver-zeolite were prepared asfollows. Silver-zeolite (1, 3, and 5 wt%) was incorporated into the glass ionomer cement powderand then mixed with the polyacidic liquid at the ratio recommended by the manufacturer. Agardiffusion test was used to evaluation of antibacterial effect. Setting time, film thickness andcompressive strength were also determined. Paired samples t-tests and ANOVA were used, andP〈0.05 was considered significant. Film thickness and setting time were increased dependent on theamount of silver-zeolite. Glass ionomer cement with 1 wt% of silver-zeolite seemed to increase thecompressive strength. However, increasing ratio of compressive strength was diminished beyond 3wt%. Glass ionomer cements containing silver-zeolite have been successfully demonstrated to haveantimicrobial effects on S. mutants in vitro. These results indicate that glass ionomer cementcontaining silver-zeolite have the potential to enhance antibacterial of dental cement in oral cavity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.831.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Fracture Strength of Ceramic Bracket Tie Wings Subjected to Force Direction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1353-1356 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, the effects of bracket designs and force direction on fracture strength ofalumina bracket were evaluated. Two differently designed alumina brackets (MISO, HT Co., Ltd.,Seoul, Korea) were tested. Each bracket was bonded with orthodontic adhesive to stainless steelcylinder. Compressive force was applied to the tie wing of bracket at 30°, 60°, and 90° to the longaxis of the test device. Fracture strengths were assessed by using a universal testing machine(Instron 3366, Instron Co., Ltd., U.S.A.). Fractured bracket surfaces were examined using SEM.Statistical analysis was performed by using SPSS 9.0 for Windows program. Paired samples t-testsand Kruskal-wallis tests were used at P〈0.05. The fracture strength ranged from 150 N with theocclusal wing to 63 N with the cervical wing in bracket A. A significant difference was founded infracture strength between the bracket designs and force directions. Based on this result, it could beconcluded that bracket designs and force direction was important rule to improve fracture strengthof ceramic bracket
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1353.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Cyanoacrylate-Based β-TCP Adhesive on Pullout Strength of Orthodontic Mini-Screw (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1361-1364 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, the effect of cyanoacrylate-based β-tricalcium phosphate (β-TCP) onpullout strength of orthodontic mini-screw was evaluated. New cements were prepared by mixingHistoacryl® (n-butyl cyanoacrylate) and acid-treated β-tricalcium phosphate. The ratios of β-TCP toHistoacryl® were 0, 0.5, 1.0, and 2.0. Artificial bone blocks were used as a substrate for the miniscrewimplantation. The test groups were divided into three groups (one solid bone block [group 1]and a bone block with a 0.9 mm hole [group 2], and a bone block with a 2.5 mm hole [group 3]).And each group was divided into subgroups according to cement usage and non-usage. The usedartificial bone density was 0.64g/cm2. Pullout strengths were determined using a universal testingmachine. Statistical analysis was performed using the SPSS 9.0 for Windows program. Pairedsamples t-tests and ANOVA were used with p〈0.05. The maximum pullout strengths were 295.9 ±3.8 N for group 1, 261.1±15.0 N for group 2, and 273.2±20.0 N for group 3. In group 1 and 2, thepullout strength in the subgroup using cement was higher than that of the subgroup of not usingcement (p〈0.05). In group 3, the pullout strength in the subgroups using cyanoacrylate-based β-TCP cement was higher than that of the subgroup using conventional glass ionomer cement (GCFuji-I, GC Co., Tokyo, Japan) (p〈0.05). These results indicate that our β-TCP/Histoacryl® cementshave the potential to enhance pullout strength of the orthodontic mini-screw
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1361.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    The Effect of Ceramic Surface Treatments on the Shear Bond Strength of Dental Composite Resin to All-Ceramic Coping Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1365-1368 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The purpose of this study was to evaluate the shear bond strength of composite resin to 4different all-ceramic coping materials with 3 different surface treatments after thermocycling andwithout thermocycling. Three different surface treatments - sandblasting with 50 ㎛ alumina particles(AB); sandblasting with 50 ㎛ alumina particles and acid etching with 4% hydrofluoric acid (AE);sandblasting with 50 ㎛ alumina particles and 30 ㎛ alumina particles with tribochemical silicacoating (SI) and silane application - were used on four different all-ceramic; Feldspatic ceramic(Duceram Plus); Lithium disilicate ceramic (IPS Empress2); Alumica ceramic (In-Ceram Alumina);Zirconia ceramic (Zi-Ceram) - substrates. Shear bond strength of restorative composite resin tosubstrate was tested after thermocycling and without thermocycling (n=10). Each specimen wassubjected to a shear load at a crosshead speed of 2 ㎜/min until fracture. Two-way analysis ofvariance and Duncan multiple comparison test (α =0.05) were used to analyze the bond strengthvalues. There were significant differences in the bond strengths for ceramic types (P〈.001), surfacetreatments (P〈.001), and thermocycling (P〈.001). The Duncan analysis showed that the Si specimenshad significantly higher bonding strengths than other specimens. The bond strength of compositeresin decreased after thermocycling
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1365.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The Characterization of the Nano–Micro Hybrid Structure of Titanium Surface and Osteoblast Response to the Surface (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 589-592 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The titanium oxide layer with nano–micro hybrid structure on the titanium substrate wasformed by grit-blasting and anodic oxidation treatment. A micro rough surface can be formed bygrit-blasting and nanotube arrays can be formed by anodic oxidation or NaOH treatment after anodicoxidation. We investigated the surface characterization on titanium and the response of the osteoblastlike cell (MG-63) to the surfaces made by different treatments. Surface structure (morphology),wettability characterized by SEM, contact angle. The attachment and proliferation behavior of MG-63cells on the titanium surface by different surface treatments were characterized by SEM observationand MTT assay.The attachment and proliferation of osteoblast cells is accelerated by the topographyof the nano structure like a nanotube, the nano surface acts as an attachment point for the filopodia ofgrowing cells. Nano structure increases surface area and nano-micro structure significantly increasessurface area. Such nano–micro hybrid structure on the titanium substrate can be useful for awell-adhered bioactive surface layer on Ti implant used metals for orthopedic and dental implants
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.589.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Physical and Adhesive Properties of Cyanoacrylate-Based β-TCP Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 419-422 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Histoacryl® (N-butyl-2-cyanoacrylate) has been widely utilized as a tissue adhesive. Theaim of this study was to evaluate the physical and adhesive properties of newly developedcyanoacrylate-based β-TCP composite systems. The β-TCP powder was modified on the surfacewith citric acid to make this material mixed with cyanoacrylate easily. The setting time of acidtreatedβ-TCP/ Histoacryl® systems was dramatically prolonged and the polymerization heat wassignificantly decreased compared to that of untreated β-TCP/Histoacryl® system. The shear bondstrength of cyanoacrylate-based β-TCP composites decreased with addition of acid-treated β-TCPfiller. The compressive strength of β-TCP/Histoacryl® composites increased strongly withincreasing the amount of acid-treated β-TCP filler. The cytotoxicity of the β-TCP/Histoacryl®composites decreased with the increasing of the amount of added β-TCP. These results indicatedthat our novel β-TCP/Histoacryl® composites had the great potential to serve as adhesives or fillingmaterials in the dental field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.419.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Biocompatability of Precipitation-Enhancing Anodic Oxidation on Titanium as Implant Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 593-596 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The composition of the electrolytes used in the process of anodic oxidation was modified togenerate the novel anodic oxidation. The surface topography of the novel anodic oxidation showed that thepore/crater structures with the precipitants attached over the surface were observed in SEM. The physicalproperties and biocompatibility of the surface with the novel anodic oxidation were compared with that ofanodic oxidation and machined surface of titanium. XRD, Bioactivity in a simulated body fluid, cellproliferation, and MTT test were performed to evaluate the differences among different surfaces
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.593.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Abrasivity of Desensitizing Dentifrice Containing Sodium Metasilicate (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1397-1400 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This in vitro study compared the abrasivity of commercial desensitizing dentifrices with asodium metasilicate (Na2SiO3) dentifrice using a Surface Profile Method. Dentin specimens weremade from the root of extracted human molars. The cervical part of the teeth was sectioned with adiamond wheel disk. The teeth were embedded into an epoxy resin mold and the surface wasgradually polished by silicone carbide paper. After grinding, the degree of surface roughness wastested within the range of 2 mm with tapping. The British Standard Institution reference dentifrice(BSI: CaCO3 40%) and experimental dentifrices (group 1: Na2SiO3 25%, CaCO3 10% and SiO210%, group 2: CaCO3 10% and SiO2 10%, group 3: CaCO3 10% and SrCl2 10%, group 4: ColloidalSilica 2-3% and Hydroxyapatite 10-20%) were evaluated. The dentifrice slurries were prepared bymixing 24 grams of the dentifrice in 12 ml distilled water. Each tooth specimen was brushed with thedentifrice slurries 1,000 times. The relative abrasivity of each dentifrice was evaluated from the ratioof the BSI standard dentifrice to each experiment. The results were analyzed by one-way ANOVA andTukey’s multiple comparisons using Window SPSS (Statistical analysis system) 12.0. Groups 1 (71),2 (74.2), 3 (38) and 4 (7.8) showed a lower abrasivity than the BSI dentifrice (100) (p〈0.05). Therelative abrasivity of groups 3 (38) and 4 (7.8) was the lowest compared with the BSI dentifrice (100).However, group 1 (71) containing Na2SiO3 showed a similar abrasivity to group 2 (74.2), which didnot contain Na2SiO3 (p〉0.05). Therefore, Na2SiO3 had no influence on the abrasivity of thedentifrice. In conclusion, the dentifrice containing Na2SiO3 had a lower abrasivity than the BSIreference dentifrice, but showed a significantly higher abrasivity than the existing commercialdesensitizing dentifrices. Overall, the relatively high abrasivity of Na2SiO3 dentifrice is believed tobe the result of other components in the abrasive system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1397.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Antibacterial Effect of Oral Rinses Containing Phytosphingosine (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 941-944 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The main objective of this study was to manufacture an oral rinse using the naturalantibacterial agent (phytosphingosine, Doosan, Korea) for the prevention of periodontal disease anddental caries. Phytosphingosine is known to inhibit the growth of bacterial strains and induceapoptotic cell death in human cancer lines. In this study, antibacterial activity and cytotoxicity oforal rinses were performed with an experimental group containing phytosphingosine(PS) in vitro.Control groups consist of two Korean products and two American products containingchlorhexidine and cetylpyridinium chloride, respectively. There was no significant differencebetween experimental and control groups in the antibacterial activity and cytotoxicity except forChika Chika Liq (p〈0.05). According to the results, antibacterial activity of oral rinse containing PSwas 99.62%, the strongest contact inhibition of Streptococcus mutans strain among tested groups. Inthe cytotoxicity test of oral rinses, PS had a weaker cytotoxicity than control groups in mouse andhuman normal cell lines and showed the strongest cytotoxicity in human oral cancer cell lines (KBcell). From the results, PS may be widely used as an oral rinse for the healthy and the patients withoral cancers in the near future
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.941.pdf
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