Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 22, Issue 2
Displaying 1-8 of 8 articles from this issue
  • Takako YOSHIKAWA, Nipaporn WATTANAWONGPITAK, Yang YUAN, Junji TAGAMI
    2004 Volume 22 Issue 2 Pages 79-86
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the effect of flowable composite on the marginal sealing and cavity wall adaptation of composite restorations, and on the hardness, elastic modulus and flexural strength of resin composite. Cylindrical cavities, 1 mm deep and 3 mm in diameter (C-factor= 2.3) were prepared on flat bovine dentin surfaces. The teeth were restored with Clearfil SE Bond adhesive system followed by Photo Clearfil Bright or Filtek Flow composites. The resins were cured with 600 mW/cm2 40 s using experimental light curing unit. After thermocycling, dye penetration tests were carried out. Composite specimens of 2 mm thickness were polymerized in Teflon molds with 600 mW/cm2 40 s using experimental light curing unit. KHN and elastic modulus measurementswere taken at the top and bottom surfaces of each specimen using Knoop Hardness tester and Nano-indentation tester respectively. Composite specimens of 2×2×8 mm were polymerized in Teflon molds, flexural strength were measured using three point bending test. The flowable composite significantly improved adaptation of resin composite to the cavity wall, and flexural strength, bottom surface microhardness and elastic modulus. However, cured resin composite showed significantly lower microhardness compared with the conventional composite.
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  • Yasuhiro WATANABE, Masayuki TOMURO, Shigeki KOMATSU, Yoshiaki HATA
    2004 Volume 22 Issue 2 Pages 87-96
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    To evaluate fracture toughness of adhesive resin cements, Notchless Triangular Prism Fracture Toughness Test (NTP) was applied and examined whether Adhesive prism and its adhesive gap conditions correspond to the evaluation method of fracture toughness test. Adhesive prism was composed of the adhesive material sandwiched between two metal triangular prisms at three kinds of gap (0.5, 1.0, 2.0 mm). Superbond C& B (SB) and Panavia Fluoro Cement (PV) were used as an adhesive material. Fracture phenomenon of adhesive surface was investigated using fractographical analysis, stress-strain curve analysis and maximum fracture strength. Results were as follows. 1. NTP using adhesive prism showed proper fracture toughness values (K1c) of dental adhesive resin cements. 2. The different fracture phenomena were shown: 2.0 mm gap was cohesive fracture and 0.5 mm gap was adhesive fracture. 3. Zero point five mm gap showed the adhesive fracture and its K1c did not show significant difference between SB and PV. 4. There was no significant difference of K1c between PV20 (2.0 mm gap) and PVP (NTP prism made with PV).
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  • Hiroaki YANAGIDA, Naomi TANOUE, Mitsuru ATSUTA, Yoshikazu KOISHI, Hide ...
    2004 Volume 22 Issue 2 Pages 97-102
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of the current study was to evaluate the effect of functional monomers with phosphorus on bonding durability to titanium. Three metal conditioners (Alloy Primer, AP; Metal Link, ML; Eyesight Opaque Primer, EP) were assessed. The functional monomers for base metal are 10-methacryloyloxydecyl dihydrogenphosphate (MDP) for the AP, 6-methacryloxyhexyl phosphonoacetate (MHPA) for the ML, and methacrylatephosphate (MP) for the EP. Cast disk specimens made of high-purity titanium (T-Alloy H) were air-abraded with 70μm alumina, primed with three conditioners, and then bonded with an acrylic resin adhesive (Super-Bond C&B). Shear bond strengths were determined both before and after thermocycling (20, 000 cycles).
    Before thermocycling, the shear bond strengths for the AP and ML groups were significantly higher than those for the EP and unprimed (defined as control) groups (p<0.05). The AP group exhibited significantly higher bond strength than the ML group after thermocycling (p<0.05). Significant difference was not found between the EP and the unprimed groups regardless of thermocycling application (p>0.05).
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  • Yoshihiro NISHITANI, Tomiko NISHITANI, Toshiyuki ITOTA, Yasumitsu TAKA ...
    2004 Volume 22 Issue 2 Pages 103-109
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to investigate the effect of Ca (OH) 2, paste on bond strength of a self-etching priming adhesive system (Mega Bond) to root canal dentin. Calcium hydroxide paste was medicated into root canals of human extracted incisors and the teeth were stored in water at 37°C for 1, 7 and 30 days after sealing of orifices. After storage, root canals were rinsed by saline. The medicated teeth and control teeth, which have no medication and storage, were treated with Mega Bond and filled with resin composite according to manufactures' instructions. After immersion in water at 37°C for 24h, the teeth were serially sectioned into multiple slices and the micro-tensile bond strengths were measured. Surfaces of root canal dentin and resin-dentin interfaces in each group were also observed in SEM. The bond strengths to root canal dentin for 7 and 30 days group were significantly lower than those of control group (p<0.05, one-way ANOVA and Dunnett test). No morphological changes at resin-dentin interface were observed among all groups. Remnants of Ca (OH) 2 paste on the surface of root canal dentin were observed for 7 and 30-day groups. In conclusion, it is necessary for good adhesion to root canal dentin to completely remove Ca (OH) 2 paste.
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  • Evaluation of air-thinning for bonding resin
    Kazuyo YAMAMOTO, Koichiro SUZUKI, Hidehiko MIYAJI, Naohiro IWATA, Hide ...
    2004 Volume 22 Issue 2 Pages 110-119
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The aim of this study was to investigate if air thinning of bonding resin would affect bond strength and marginal microleakage for enamel and dentin using three self-etching primer adhesive systems, Clearfil Mega Bond, UniFil Bond and Imperva Fluoro Bond. Tensile bond strengths to bovine enamel and dentin, and microleakage in the cervical cavities prepared on the extracted human molars were measured. For the enamel, there was no significant difference both in bond strength and microleakage between brush thinning and air thinning for any of the three adhesive systems. However, the bond strength to dentin with air thinning was significantly reduced compared to those obtaining with brush thinning for the three adhesive systems (p<0.01). For Clearfil Mega Bond and Imperva Fluoro Bond, the microleakage at the dentin with brush thinning was significantly smaller than those obtained with air thinning (p<0.05). For UniFil Bond, the leakage with brush thinning appeared to be smaller than those obtained with air thinning, despite of no significant difference. In conclusion, for adhesive systems using self-etching primers, thinning of the bonding resin by a brush achieved favorable bond performances compared to air thinning.
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  • Kunitaka HOTTA, Kouichi TASHIRO, Akari SHIMOZONO, Takashi YAMAMOTO, No ...
    2004 Volume 22 Issue 2 Pages 120-127
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to decrease setting time of 4-META/MMA-TBB resin but not give adverse effect on bonding to enamel and their mechanical properties.
    The hypothesis was that dissolving a cross-linking agent, diethylene glycol dimethacrylate (DiEDMA), into 4-META/MMA-TBB resin could decrease the setting time.
    Influence of dissolved DiEDMA in 4-META/MMA-TBB resin on the setting time, tensile bond strength to etched enamel with 20 % phosphoric acid for 30 s and the bending strength were studied. It was found that dissolving 3-10 % DiEDMA in the adhesive could shorten the setting time but did not give statistically significant effect on the bonding to enamel and the bending strength.
    It was concluded that 4-META could promote diffusion of monomers before their initiation of polymerization to penetrate etched enamel enough and good bonding was obtained even the setting time was decreased by dissolving 3-10 % DiEDMA into the 4-META/MMA-TBB resin.
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  • Toru NIKAIDO, Yuka TAKANO, Junji TAGAMI
    2004 Volume 22 Issue 2 Pages 128-133
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the efficacy of pretreatment agents of metal and ceramics for intraoral repair on bonding to tooth structures. Extracted bovine incisors were ground with 600-grit silicone carbide paper to obtain enamel and dentin surfaces. The surfaces were demarcated with a vinyl tape which has a 4 mm diameter hole. The specimens were divided into three groups. For the first group, the surfaces were left without any treatment. For the second group, the surfaces were pretreated in the same manner as treatment of ceramic. For the third group, the surfaces were pretreated in the same manner as treatment of precious metal. Following this, all of the tooth surfaces were bonded using one of two dentin bonding systems, Clearfil Mega Bond (MB, Kuraray Medical, Tokyo, Japan) and Unifil Bond (UB, GC, Tokyo, Japan). A resin composite (Clearfil AP-X, Kuraray Medical, Tokyo, Japan) was placed and light-cured for 40s. The specimens were stored in water for 1 day. Tensile bond strength testing was performed at crosshead speed of 2 mm/ min. The bond strengths of MB and UB tend to decrease in the use of the ceramic and metal pretreatment prior to application of the bonding systems. The metal pretreatments significantly reduced the bond strengths to dentin (p<0.05). It was suggested that such pretreatment solutions in repair system should be taken care not to contaminate the tooth surfaces.
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  • Comparisons with proprietary adhesive systems in various resin-based restorative materials
    Masao IRIE, Rosalina TJANDRAWINATA, Kazuomi SUZUKI
    2004 Volume 22 Issue 2 Pages 134-139
    Published: August 15, 2004
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the performance of applications of using selfetching adhesives (Prompt L-Pop®, 3M ESPE AG), when used with compomers and lightactivated restorative materials, in comparison to the performance of each restorative system adhesive. Evaluation parameters to be considered for the adhesive systems were (i) immediate marginal gap formation in tooth cavities and (ii) their immediate shear bondstrengths to enamel and to dentin.
    For compomers and light-activated restorative materials, application of Prompt L-Pop exhibited significantly superior marginal adaptation in the tooth cavity and enamel shear bond strength to most system adhesives. However, for dentin shear bond-strengths, there were no significant differences between Prompt L-Pop® and each restorative system adhesives, for all materials tested except Hytac and UniFil F.
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