S. SUZUKI’s research while affiliated with University of Alabama at Birmingham and other places

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Publications (8)


In vitro Wear of Provisional Restorative Resins
  • Conference Paper

July 2010

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10 Reads

S. SUZUKI

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S. MURAHARA

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[...]

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J.O. BURGESS

Objectives: The purpose of this study was to evaluate the wear rates of provisional restorative materials by in vitro system. Methods: Disk specimens (3.0mm thick, 8.0mm diameter) were fabricated with tested materials including a chemical-polymerizing acrylic resin with TMPT filler (Provista, Sun Medical), two chemical-polymerizing acrylic resins (Metafast, Sun Medical and UnifastIII, GC), two photo-polymerizing acrylic resins (Unifast LC, GC and Hardbite, Yoshida), and two chemical-polymerizing composite resins (Protemp Plus, 3M ESPE and Luxatemp, DMG). The specimens were secured to brass cups with an auto-cured acrylic and fixed to the UAB wear simulator. Localized wear test was carried out using a hemispherical steel tip and a PMMA/water slurry with 75 N at 1.2 Hz for 100,000 cycles. Wear depths were measured using a non-contact profilometer (Proscan2000, Scantron Industrial). The data (n=5) were statistically analyzed with one-way ANOVA and Tukey's test (=0.05). Results: The results of the wear tests are presented in the table below. Groups with identical letters are not significantly different (p>0.05). Conclusion: The mean wear values of composite materials were significantly lower than all other materials except Provista. The mean wear value of Provista was significantly lower compared to other chemical-polymerizing acrylics. There were no significant differences among two photo-polymerizing acrylics and two chemical-polymerizing acrylics.


In vitro Wear of a Novel Composite Crown System

March 2010

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24 Reads

Objectives: A novel composite crown system with a fiber-reinforced composite (Metacolor Prime Art, Sun Medical) has recently been introduced. The purpose of this study was to evaluate the wear of the fiber-reinforced composite according to the change of thickness of the overlying indirect composite. Methods: Disk specimens (1.5mm thick, 8.0mm diameter) of various thicknesses (shown in the upper row of the table) of the indirect composite (Metacolor Prime Art, Sun Medical) were fabricated on top of fiber-reinforced composite (Jacket Opaque, Sun Medical). They were then cemented onto Ni-Cr alloy disks (REX4, Pentron) using a resin cement (C&B Metabond, Parkell). Those specimens were secured inside brass cups with an auto-cured acrylic and inserted into the UAB wear simulator. Localized wear was carried out using a hemispherical steel tip and a PMMA/water slurry for 200,000 cycles with 75 N of force at a 1.2 Hz loading frequency. Wear depths were measured using a non-contact profilometer (Proscan2000, Scantron Industrial). The data were statistically analyzed with one-way ANOVA and Tukey's test (a=0.05). Results: The results of the wear tests are presented in the table below. Conclusion: The wear of Metacolor Prime Art was influenced by the thickness of the overlayed indirect composite. When the thickness of indirect composite was 0.1 mm or less, the underlying fiber-reinforced composite was exposed and worn rapidly.


Bond Strength of Bis-GMA/TEGDMA Resin Cements to Zirconia

April 2009

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32 Reads

Objectives: This study investigated the bond strengths of three Bis-GMA/TEGDMA resin cements to zirconia. Methods: Three resin cements including Clearfil Esthetic Cement (EC), Panavia F2.0 (PV), and Clearfil SA Luting (SA), and two silane coupling agents including Clearfil Ceramic Primer (CP) and Clearfil Porcelaine Bond Activator (PB) were used in this study. All products are manufactured by Kuaray Medical. All materials except EC contain adhesive monomer, MDP. Pairs of disk specimens (10 mm diameter, 3 mm thick, and 8 mm diameter, 3 mm thick) were prepared using a dental zirconia system (Cercon, Dentsply Ceramco). Bonding surfaces of disks were polished with a 600-grid silicon carbide paper and air abraded with 50 m alumina particles. The abraded surfaces were treated with respective silane coupling agents for silanated specimen groups (CP/EC and PB/PV). Bonding areas were regulated using an adhesive tape with a 5 mm diameter opening. Shear bond specimens were fabricated by bonding a pair of disks using one of five bonding systems mentioned above. All the specimens (five specimens for each group) were stored in 37C distilled water for 24 hours. Shear bond strengths were determined before and after thermo-cycling (4C - 60C, 1-minute dwell time for 50,000 cycles) at a 1.0 mm/min crosshead speed. The data were statistically analyzed by three-way ANOVA and Tukey's test (a=0.05). Results: The results of shear bond strengths are presented in the table below. Most of the specimens exhibited adhesive failures at the zirconia/cement interface. Identical small and capital letters denote no significant difference within the same thermo-cycling groups and the same material groups, respectively (p>0.05). Conclusion: The bond strengths of Bis-GMA/TEGDA resin cement were influenced by an addition of adhesive monomer, MDP to cements or silane coupling agents. Table. The values of Shear Bond Strengths (mean s.d.), Unit: MPa EC PV SA CP/EC PB/PV T.C. 0 55.6 4.7ab 53.8 3.9abA 45.1 4.9a 61.8 4.9bc 65.2 2.2c T.C. 50,000 0 41.1 5.0dA 62.8 3.8 50.7 1.4 31.6 9.6d


Bond Strength of a Novel Resin Cement to Resin-coated Dentin

April 2009

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5 Reads

Objectives: The purpose of this study was to evaluate tensile bond strengths (TBS) of a novel resin cement to resin-coated dentin. Methods: Flattened dentin surfaces (#180) of bovine teeth (n=30) were coated with a self-etching adhesive (Brush&BondTM [B&B], Parkell). Non-coated dentin specimens were used as a control group (n=10). Oxygen inhibited layer on the coated surface was removed with an ethanol containing cotton pellet and covered with a temporary sealing material (Caviton, GC). Caviton was removed after one-week storage in 37 oC water, and then a novel adhesive cement (SEcureTM, Parkell) was applied to the surface (4.8mm diameter) with and without a pretreatment of B&B or SEcure primer. The TBS was measured at a 2mm/min crosshead speed after 24 hours storage in 37 oC water. Data were statistically analyzed by one-way ANOVA and Tukey's test. (p=0.05, n=10). Results: The results (Table below) showed that the TBS of SEcure to the resin-coated dentin without pretreatment was significantly lower than that of the control (p<0.05). Both of B&B pretreatment with photo irradiation and SEcure primer pretreatment were significantly effective to increase the TBS to resin-coated dentin (p<0.05). The improved TBS values were not significantly different with the value of the control. Conclusion: It was concluded that the pretreatment using B&B or SEcure primer was essential to improve the bond strengths of SEcure to resin-coated dentin surface. Table1. Results of TBS (mean s.d.) Tested groups TBS (MPa) No resin coating (control) 7.7 2.8a No pretreatment 2.3 0.5b SEcure primer pretreatment 7.9 3.1a B&B pretreatment with photo irradiation 9.4 2.2a Values with identical letters indicate no significant difference (p>0.05).


Evaluation of a new fiber-reinforced resin composite

January 2006

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25 Reads

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11 Citations

Journal of Biomedical Materials Research Part B Applied Biomaterials

Efficacy of the usage of an experimental fiber-reinforced composite (FRC) on mechanical properties of an indirect composite was investigated by means of three-point bending and Charpy impact tests. Bond strength between the FRC and the indirect composite was also evaluated by tensile testing. The FRC consisted of a matrix resin with 25% silanized milled glass fiber (11-microm diameter, 150-microm length) and 5% colloidal silica. The values of strain of proportional limit, total strain, and fracture energy of the FRC during the bending test (1.2%, 10.4%, and 41.6 x 10(-3) J) were significantly higher than those of the indirect composite (0.1%, 2.5%, and 11.9 x 10(-3) J). The impact strengths of the 1-mm specimens with FRC ranged from 15.2 to 15.9 kJ/m(2), and were significantly higher than that of the control (3.1 kJ/m(2)). The 2-mm specimens showed significant difference from the control when the FRC thickness was equal or greater than 0.5 mm. The bond strength after the thermocycling was 15.2 MPa, and all of the specimens exhibited cohesive fracture inside the indirect composite. Based upon the results, it was concluded that the FRC tested in this study improved toughness and impact resistance of the indirect composite. The interfacial bonding between the FRC and the indirect composite was strong enough to prevent delamination.


In vitro evaluation of the bonding of auto-polymerizing soft denture liner to cobalt-chromium alloy

July 2005

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23 Reads

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3 Citations

Journal of Oral Rehabilitation

This study evaluated the effects of surface pre-treatments on the bonding of auto-polymerizing silicone soft denture liner to a Co-Cr alloy denture base after cyclic thermal stressing. The bonding surfaces of Co-Cr alloy cylinders (8 mm diameter and 4 mm high) were polished with a 600-grit silicon carbide paper. The bonding surfaces received one of three pre-treatments, which included either the application of a metal primer, a metal primer after air abrasion, or a resin primer after adhesive resin coating. Tensile specimens were fabricated by polymerizing a 2-mm thickness of soft denture liner between a pair of pre-treated denture base cylinders. Failure loads were measured by tensile testing after subjecting the specimen to 0, 5, 10, 20, and 30 thousand thermal cycles. Seven specimens were fabricated for 15 groups, including three pre-treatments and five thermal cycle groups. Failure loads of resin-bonded specimens, which were formerly reported, were used as references. All data were statistically analysed by two-way anova and Bonferroni test at the 95% confidence level. Adhesive resin coating of the metal surface was effective in enhancing the failure loads up to 5000 thermal cycles. However, failure loads of all metal-bonded groups were significantly lower than those of resin-bonded groups at all thermal cycling intervals. The results of this in vitro study implied that polymerizing adhesive resin on the Co-Cr alloy might be a promising method, when the clinicians need to acquire improved bonding of an auto-polymerizing soft denture liner to Co-Cr alloy denture bases.


Effects of filler composition on flexibility of microfilled resin composite

July 2005

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59 Reads

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34 Citations

Journal of Biomedical Materials Research Part B Applied Biomaterials

The effects of the filler composition on physical and mechanical properties of microfilled composites was investigated by measuring water absorption, solubility, compressive, flexural, and impact strength. A series of experimental composites, consisting of UDMA/TEGDMA comonomer matrix and prepolymerized fillers, was fabricated. The prepolymerized fillers were composed of hydrophobic colloidal silica and two monomers in varying ratios, trimethylolpropanetrimethacrylate (TMPT), and polyesterdiacrylate (PEDA). TMPT/PEDA ratios were 100:0, 64:36, 46:54, 18:82, and 0:100%. There were no significant differences in water sorption and solubility, regardless of the amount of PEDA monomer. Young's modulus and modulus of resilience increased with decreasing PEDA ratio. Fracture energy exhibited drastic changes (30.1 x 10(-5) J to 93.4 x 10(-5) J). The highest value of flexural strength (96.0 +/- 3.5 MPa) was obtained when the TMPT-PEDA filler was 46:54. The impact strengths of composites fabricated with TMPT-PEDA filler of 46:54 (11.2 +/- 1.4 kJ/m(2)), 18:82 (10.6 +/- 3.2 kJ/m(2)), and 0:100 (13.1 +/- 3.8 kJ/m(2)) were significantly higher than those with 100:0 (6.0 +/- 1.8 kJ/m(2)) or 64:36 (7.1 +/- 2.4 kJ/m(2)). Based upon the results, it was concluded that the mechanical properties of microfilled composites were improved by the modification of prepolymerized filler composition.


Bonding abutments to cast metal post/cores: Comparison of pre-treatment effects

February 2003

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10 Reads

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11 Citations

Journal of Oral Rehabilitation

Bond strengths were evaluated for (1) metal primer systems when the metal was contaminated by a dentin conditioner and (2) a dentin adhesive system when dentin was contaminated by metal primers. Disc specimens were cast in a silver-palladium-copper-gold (Ag-Pd-Cu-Au) alloy and dentin specimens were prepared by grinding the labial surface of bovine teeth. Specimens were treated with (1) metal primer alone, (2) dentin conditioner alone, (3) metal primer followed by dentin conditioner and (4) dentin conditioner followed by metal primer. A resin cement was poured into a mould over a restricted bonding area and allowed to set. Metal specimens were shear stressed to failure after thermocycling (4-60 degrees C; 20,000 cycles). Dentin specimens were stressed in the same manner after 24 h of immersion in 37 degrees C water. The results were compiled and analysed by anova. Data for dentin specimens treated with dentin conditioner only or with the combination of dentin conditioner and metal primer were not significantly different, statistically. Post-thermocycled groups indicated that bond strengths to the alloy significantly decreased (P < 0.05) when the primed metal surface was contaminated with dentin conditioner regardless of the timing of its application.

Citations (3)


... While the repair mechanism of aged composite is different due to the depletion of free radicals. 30 In repair of aged composite, the interface between the prepolymerized material and the fresh one is considered as a fragile link, therefore a proper surface treatment, intermediate agents and the type of repair material must be considered for a successful repair junction. 31,32,33 The acceptable repair bond strength should approach 60-70 % of the cohesive strength of resin composite, which is considered an optimal clinical bond strength. ...

Reference:

Repair bond strength of aged non methacrylate ORMOCER based bulk fill resin composite. An in-vitro study.
Effects of filler composition on flexibility of microfilled resin composite
  • Citing Article
  • July 2005

Journal of Biomedical Materials Research Part B Applied Biomaterials

... 8 Composites that are reinforced with fiber (fiber-reinforced composite or FRC) are shown to better overcome the mechanical limitations. 9,10 Owning to the satisfactory resilience and resistance properties, FRCs enable the load transfer to the dental structures more physiologically, thus preventing the development of detrimental stresses. 11 The mechanical behavior of FRC restorations in the structurally compromised teeth has been investigated in some studies using fracture strength tests. ...

Evaluation of a new fiber-reinforced resin composite
  • Citing Article
  • January 2006

Journal of Biomedical Materials Research Part B Applied Biomaterials

... In this study, the silane contamination-beforeetching groups did not exhibit a significant alteration in µTBS from the non-contaminated groups. As with previous dentin bonding studies on the effects of contamination with blood 25,26) and saliva 27) , and preapplication with metal primer 28) , the contaminants would be rinsed off with water from the dentin surface etched with phosphoric acid. It was confirmed by FTIR result, where the silane contamination-before-etching dentin showed the absorption bands without Si-O-Si peak, that was referred as acid-etched dentin. ...

Bonding abutments to cast metal post/cores: Comparison of pre-treatment effects
  • Citing Article
  • February 2003

Journal of Oral Rehabilitation