Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 25, Issue 3
Displaying 1-15 of 15 articles from this issue
  • Ayano ISHIKAWA, Yasushi SHIMADA, Junji TAGAMI
    2007 Volume 25 Issue 3 Pages 157-161
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study evaluated the micro-shear bond strengths of current one-step self-etch adhesives to enamel and dentin. Extracted human molars were cut and ground to expose flat enamel or dentin surfaces using wet#600grit SiC paper. The enamel and dentin surfaces were assigned to four groups according to four adhesives; three onestep self-etch adhesives (Clearfil S3Bond, AQ Bond Plus, G-Bond) and a two-step self-etch adhesive (Clearfil Mega Bond). Each of the adhesives was applied to the enamel or dentin surfaces in accordance with the manufacturers' instructions and restored with resin composite (Clearfil AP-X). The bonded teeth were then prepared for micro-shear bond strength tests. After storage in saline at37°C for24hours, specimens were stressed at a crosshead speed of 1 mm/min. The results showed that the two-step adhesive produced significantly higher values than the one-step adhesives to enamel (p<0.05). For dentin, Clearfil Mega Bond showed the highest bond strengths, whose values were significantly higher than both AQ Bond Plus and G-Bond (p<0.05). Although Clearfil S3Bond produced lower values than Clearfil Mega Bond, no significant differences were found (p>0.05).
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  • Inorganic filler contents, polymerization shrinkage and viscoelasticity
    Toshiki TAKAMIZAWA, Satoru UYAMA, Atsushi IROKAWA, Ryo KAWAMOTO, Akima ...
    2007 Volume 25 Issue 3 Pages 162-169
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Flowable resin composites have been developed for high flowability and have been used for the filling of pit and fissure caries, cervical lesions such as wedge-shaped defects and root surface caries. To obtain good flowability and easy handling properties, the inorganic filler contents should be decreased and diluent monomers increased, but there is concern that these modifications might lead to deteriorated mechanical properties and increased polymerization shrinkage.
    This study evaluated inorganic filler contents, polymerization shrinkage and viscoelasticity of flowable resin composites. Filler contents ranged from42.5to78.6wt% and polymerization shrinkage ranged from2.16to4.04 vol%. Polymerization shrinkage correlated to inorganic filler contents. The viscosity coefficient ranged from21 to144Pa·s and complex viscosity coefficient ranged from20 to 54 Pa·s. There was no correlation between inorganic filler contents and viscosity of flowable resins. From SEM observations, flowable resin composites were classified into three groups by their type of filler.
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  • Yohei ASAKA, Hiroyasu KUROKAWA, Keishi TUBOTA, Masahiko IKEDA, Mika IW ...
    2007 Volume 25 Issue 3 Pages 170-176
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    To minimize intervention in dentistry, resin core foundations have been widely used for endodontically treated teeth. However, the adhesive performance of these systems might vary depending on the dentin substrate, yet little is known about newly developed systems. This study investigated the effect of different sites of root dentin on the micro-tensile bond strength of resin core foundation systems by means of bond strength test and scanning electron microscopy. The results showed no significant differences in bond strengths among different sites of root dentin. SEM observations revealed no apparent difference for the specimens made with different sites of dentin surfaces.
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  • Makoto MORIGAMI, Jumpei SUGIZAKI, Shigeru UNO, Toshimoto YAMADA
    2007 Volume 25 Issue 3 Pages 177-181
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study examined the proportion of each cavity form of resin composite restorations. Seven dentists restored various kinds of lesion with resin bonding and resin composite for3months, and the restorations were classified into Class I, II, III, IV, V, Cervical lesion, Root surface caries, Incisal defect, Facing, Repair of facing crown, and Others. As a result, the total number of restorations was1, 317, and the items were Cervical lesion455 (34.5%), Class II244 (18.5%), Class III171 (13.0%), Class I123 (9.3%), Class V99 (7.5%), Class IV58 (4.4%), Root surface caries 52 (3.9%), Incisal defect 40 (3.0%), Facing36 (2.7%), Others21 (1.6%), and Repair of facing crown18 (1.4%). The total number of working days with seven dentists was297days, and it was revealed that one dentist performed4.4 resin composite restorations a day on average. This clinical survey showed that resin bonding and composites were applied most to the cervical lesions that had the toughest clinical situations for bonding among all kinds of the cavities. The development and improvement of resin bonding agents and/or resin composite pastes pos essing excellent handling properties and durability will become increasingly important.
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  • Shuichi ITO, Takashi SAITO
    2007 Volume 25 Issue 3 Pages 182-189
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study evaluated bond strength to dentin and dentinal tubules occlusion of one-step adhesive systems. The superficial occlusal dentin of28extracted human molars was used in this study. The dentin surfaces were treated with three one-step adhesives: SI-R20603 (SI-R), Fluoro bond Shake One (SO), Clearfil tri-S Bond (TS) and one two-step adhesive: Fluoro bond II (FB). First, micro-tensile bond strength in each specimen was measured in a universal testing machine. Next, dentinal tubules occlusion in each specimen was measured using a fluid filtration system. Micro-tensile bond strength in FB was significantly higher than that in SI-R, SO and TS. There was no significant difference among SI-R, SO and TS. Moreover, there was no significant difference in fluid movement among all adhesives. These results indicated that one-step adhesive achieves excellent dentinal tubules occlusion although it is inferior to two-step adhesives in dentin bond strength.
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  • Seiko YAMAMOTO, Makoto MORIGAMI, Jumpei SUGIZAKI, Shigeru UNO, Toshimo ...
    2007 Volume 25 Issue 3 Pages 190-196
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    In order to enhance the adhesion properties, such as adhesion to enamel and hardness of the set bonding layer, of the commercially available G-Bond ® (GC), a one-bottle/one-step self-etching adhesive, GBA 300, was experimentally developed by changing the proportions of the ingredients. In this study, the bonding efficacy of this system was evaluated by examining the interfacial ultrastructure under FE-SEM and TEM and measuring the microtensile bond strength (μTBS) to dentin. FE-SEM observation revealed a tight interfacial junction to enamel, dentin and caries-affected dentin although the hybrid layer was not clearly observed in the dentinal interface. In TEM figures, a thin interfacial structure, approximately 200nm in thickness, was found between the resin bonding layer and dentin, which suggested the presence of the adhesion mechanism at the nano level. Neither FE-SEM nor TEM showed the bubble structures caused by the phase separation observed with the conventional G-Bond ®. The μTBS significantly varied due to the tooth used (p<0.05), and might be influenced by the region of the tooth. Since μTBS might have complex features, a careful assessment is required when evaluating the bond strength in the microtensile mode.
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  • Toru NIKAIDO, Miho NISHIMURA, Yasuhiro IIDA, Go INOUE, Junji TAGAMI
    2007 Volume 25 Issue 3 Pages 197-203
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study analyzed the ultra-structure of the resin-dentin interface after acid-base challenge in recent all-inone adhesive systems. Three adhesive systems, Absolute2 (AB), SI-R20603 (SI-R, experimental) and Tokuyama Bond Force (BF), were used in this study. Dentin disks were obtained from extracted human molars. In order to observe the dentin-adhesive interfaces, the adhesive system was applied to the dentin disks according to the manufacturers' instructions, and then a flowable composite was placed between two dentin disks. After the specimens were stored in distilled water for24hrs, they were sectioned into two halves. The halves of the bonded specimens were just polished. The other halves were immersed in a buffered demineralizing solution (pH4.5) and in5% NaOCl, then sectioned, and polished. After all the specimens were etched with argon-ion, they were observed by SEM. For interface analysis, the thin adhesive layer of each adhesive system was less than5μm. The hybrid layer of each adhesive system was too thin to be detected by SEM. An acid-base resistant zone (ABRZ) was observed in all the groups. However, the thickness of the ABRZ depended on the adhesive material.
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  • Yumiko TOKINIWA, Yuji TSUBOTA, Keita SASAKI, Shigeru KITAMURA, Yukifum ...
    2007 Volume 25 Issue 3 Pages 204-210
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study examined the shear bond strength of a new composite resin core system ESC-3 (Tokuyama Dental) to human dentin. We measured the shear bond strength of ESC-3 and other composite resin core systems available. For the commercial materials, two types of composite resin core materials and five types of adhesive bonding systems were selected.
    Additionally, scanning electron microscope observation was performed in order to determine the thickness of the bonding layer of each material by cross-sectioning the specimens.
    As a result, the new composite resin core system ESC-3 indicated almost the same or rather higher bond strength than the other ones. Regarding the thickness of bonding layer, all the systems showed almost the same thickness as the manufacturer's value, as previously reported.
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  • Masao IRIE, Kazuomi SUZUKI
    2007 Volume 25 Issue 3 Pages 211-216
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study evaluated the effect of one-day storage on the bonding ability of new resin cements (ResiCem: Shofu, Clearfil Esthetic Cement: Kuraray Medical) to human tooth and zirconia (Lava: 3M ESPE, ZirCAD: Ivoclar Vivadent) with a composite inlay system (Z250: 3M ESPE), and compared the results with those of a conventional resin cement (LinkMax: GC).
    The shear bond strength to tooth substrate of three resin cements after one-day storage was improved compared with the immediate condition. The bonding ability to zirconia of resin cements after one-day storage was improved compared with the immediate condition, except LinkMax. This was caused by the development of the resin cement/tooth (or zirconia) interaction and the resin cement itself, because of the increase of flexural strength and flexural modulus.
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  • Kohyoh SOENO, Yohsuke TAIRA, Mitsuru ATSUTA
    2007 Volume 25 Issue 3 Pages 217-222
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The current study investigated the effect of an experimental dentin conditioner on the bond strength of 4-META/MMA-TBB resin to dentin after long-term immersion in water. The experimental conditioner (AS-FE) was an aqueous solution of 10 wt% ascorbic acid and 5 wt% ferric chloride. Human molar teeth were prepared to expose flat dentin surfaces. The dentin was treated sequentially with 40 wt% phosphoric acid, 10 wt% NaClO and the AS-FE (Exp). A commercially available dentin conditioner, an aqueous solution of 10 wt% citric acid with 3 wt% ferric chloride, was used as a control group (10-3). The pretreated dentin surfaces were bonded to resin rods using the 4-META/MMA-TBB resin. Micro-tensile bond strengths were determined after water immersion for 24 hours, 12 months, 18 months, 24 months, and 30months. All data were analyzed by ANOVA, and differences among groups were analyzed by Duncan's new multiple range test (n=13, p<0.05). Mean bond strength of Exp was significantly higher than that of the 10-3 through water immersion for 30 months. Exp also showed no significant decrease through water immersion for 30 months, while 10-3 exhibited a significant decrease after water immersion for 12-30 months compared to that for 24 hours. The present findings suggested that the use of the AS-FE conditioner in conjunct with phosphoric acid and NaClO improved the bonding durability between 4-META/MMATBB resin and human dentin.
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  • Mika FURUCHI, Atsushi MIKAMI, Tomohisa OGINO, Hiroyasu KOIZUMI, Takash ...
    2007 Volume 25 Issue 3 Pages 223-228
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    This study evaluated the micro-tensile bond strength and adaptation of resin co posite to sound or carious dentin applied with a novel bonding system AQ Bond SP (AQSP) and AQ Bond Plus (AQP). Barreled cavities, 3 mm in diameter by1.5mm in depth, were prepared on the surfaces of extracted human molars, which included the carious region. Either of the bonding systems was applied on the dentin followed by resin composite filling and photo-polymerization. The restored teeth were sliced vertically to measure the micro-tensile bond strengths (MTBS) of the bonding system to the sound or carious dentin. The mean values of MTBS for AQSP and AQP were: 30.1± 5.5 and 29.3 ± 7.4 MPa (sound dentin), 31.8 ± 4.8 and 28.1 ± 7.6MPa (carious-affected dentin), and 28.5 ± 6.1 and 27.8 ± 9.5MPa (carious-infected dentin).
    SEM observation of the dentin-bonding interface showed good sealability of both AQSP and AQP without any gaps.
    The results indicate that the novel AQSP and AQP have high bond strength and excellent cavity adaptation to both sound and carious dentin.
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  • Masao HANABUSA, Naotake AKIMOTO, Yasuko MOMOI
    2007 Volume 25 Issue 3 Pages 229-238
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Recently, manufacturers have launched a novel resin adhesive called one-bottle self-adhesive, which combines three fundamental functions for tooth adhesion: etching, priming and bonding. We speculated that the bond strength could be influenced by the difference of smear layer generated on the dentin surface. Non-carious extracted human molars were prepared using a diamond saw to expose the dentin surface. Dentin surfaces were prepared with 600-grit SiC paper, or a diamond paste to create a smear-free layer. According to each manufacturer's instructions, two newly developed one-bottle self-adhesives (Absolute 2: Dentsply Sankin and Bond Force: Tokuyama Dental) and a one-step adhesive (One-Up Bond F Plus: Tokuyama Dental, control) were applied to the prepared dentin surface followed by resin composite building. Specimens were then stored in distilled water at 37°C. After 24 hours the micro-tensile bond test was performed using a universal testing machine (Type 4443, Instron) with the bonded area of 1.0×1.5 mm at the cross-head speed of 1.0mm/min. There was no significant difference in the bond strength of two different dentin surfaces in each product. We conclude that the bond strength of two products categorized as one-bottle self-adhesives was not influenced by the difference of smear layer generated at the dentin surface.
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  • Yasushi CHIBA, Noriatsu SUNADA, Naoki INOUE, Ryo KAWAMOTO, Motoka TONE ...
    2007 Volume 25 Issue 3 Pages 239-243
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to examine the influence of operator variability on dentin bonding of the two-step self-etching primer system: Fluoro Bond II (Shofu). Shear bond strength test, failure analyses of the fractured specimen, and scanning electron microscopy observation were carried out. No significant difference in shear bond strength was detected among the operators. A slight variation in bond strength was seen for operators with longer clinical experience. Predominant failure mode was mixed mode, and adhesive failure was most frequently observed for the specimens made by students. Even though there were no significant differences among the operators, large coefficients of variation indicated the necessity of improving the bonding performance of the adhesive system.
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  • Yasuko NAKAOKI, Naoko KAMISHIMA, Takatsumi IKEDA, Satoshi INOUE, Hideh ...
    2007 Volume 25 Issue 3 Pages 244-250
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Early micro-shear bond strengths of DCB-100 (DC), Clearfil S3 Bond (TS) and Clearfil SE Bond (SE) were evaluated. The occlusal surfaces of extracted human third molars were used in this study. The adhesives were applied on the dentin surfaces according to the manufacturer's instructions. Resin composite was then placed and light-cured for 40 sec. After 10 min and 24h, a micro-shear bond test was carried out and the fractured dentin surfaces were observed microscopically. The data were analyzed by one-way ANOVA and Duncan's new multiple range tests (p<0.05). The mean bond strengths of the 10-min group were 32.5 (DC), 36.3 (TS) and 40.3 (SE) MPa, respectively. The mean bond strengths of the 24-h group were 32.9 (DC), 33.8 (TS) and 37.3 (SE) MPa, respectively. There were no statistically significant differences in micro-shear bond strengths between the 10-min and 24-h groups for each adhesive system (p>0.05). The microscopic observation of fractured dentin surfaces revealed morphological differences between the 10-min and 24-h groups for each adhesive.
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  • Yasushi SHIMADA, Zhengdi HE, Junji TAGAMI
    2007 Volume 25 Issue 3 Pages 251-255
    Published: December 15, 2007
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The polymerization shrinkage of resin composite which may be responsible for bonding failure remains a big challenge in light-cure resin composite restoration. The purpose of this study was to investigate the effects of an incremental filling technique and flowable liner on the bond strength of resin composite in different sized cavities.
    Two sizes of Class I cavities were prepared using bovine dentin (π×(5/2) 2×5mm3 and π×(3/2) 2×3mm3). A light-cure resin composite with a self-etching primer adhesive was used to fill the cavities using bulk filling with and without flowable liner or incremental filling. After 24 hrs storage in 37°C water, the micro-tensile bond strength was measured at a crosshead speed of 1mm/min.
    The bond test results showed that the incrementally filled and lined cavities showed significantly higher bond strength than bulk filling in large cavities (p<0.05). However in small cavities, neither the incremental filling technique nor flowable liner improved the bond strength. Consequently, we concluded that not only the filling technique but also the cavity size affected the bond strength to the cavity floor in Class I cavities.
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