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Yasushi SHIMADA, Yuichi SEKI, Yasutaka SASAFUCHI, Akhtar UZZAMAN, Vant ...
2003 Volume 21 Issue 3 Pages
161-166
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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The purpose of this study was to evaluate the pulpal response of an indirect restoration bonded with a newly-developed MMA resin cement (Multibond, Tokuyama Dental).Cervical cavities were prepared in monkey teeth. The teeth were randomly divided into 3 groups. A self-etching primer attached to the resin cement was applied to the teeth, and Estenia inlay (Kuraray Medical) was bonded to the cavities using freshly mixed resin cement. The teeth were then extracted after 3, 30, and 90 days, fixed in 10 % buffered formalin solution, and prepared according to routine histological techniques. Five micrometer sections were stained with hematoxylin and eosin, or Brown & Brenn gram stain for bacterial observation. No serious inflammatory reaction of the pulp, such as necrosis or abscess formation, was observed in any of the experimental groups, except for 1 case in 30 days period, in which pulpal exposure was suspected. Disarrangement of odontblast layer and deposition of reparative dentin were the major reaction observed in this material. No bacterial penetration along the cavity walls was detected. The Estenia inlay bonded with the newly-developed MMA based resin cement showed an acceptable biological compatibility to the monkey pulp.
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Shin-ichiro KUBO, Tadashi ONIZUKA, Satomi ITOH, Yoshito MINESAKI, Sada ...
2003 Volume 21 Issue 3 Pages
167-174
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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The purpose of this study was to evaluate the operationalities of three trial denture repair resins and their bond strengths to denture base resin or clasp/bar cast with Co-Cr alloy.
The trial resins tested were as follows. Trial resin (1) was 4-META/MMA-TBBO resin: theparticle diameter of PMMA powder was 40μm. Trial resin (2) was 4-META/ MMA-BPO amine resin: 4-META was contained in powder. Trial resin (3) was MAC10/ MMA-BPO amine resin: the particle diameter of PMMA powder was 40μm. The operationalities of these trial resins were compared to those of conventional self-curing acrylic resin and the shear bond strengths to denture resin and Co-Cr alloy were investigated.
The results were as follows. Three types of trial resins had good operationality as well as conventional self-curing acrylic resin. The bond strengths to denture base resin were equal to those of commercial adhesive resins. Two trial 4-META resins exhibited excellent bond strengths to Co-Cr alloy primed with VBATDT-MDP primer.
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Shigeru TANAKA, Yoshima ARAKI, Hiroyuki MIURA
2003 Volume 21 Issue 3 Pages
175-185
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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To develope an orthodontic direct bonding system capable of debonding the brackets at the bracket-resin interface or in the resin layer, the adhesion strength of bovine enamel to stainless steel rod and its durability were evaluated using the mixture of the adhesive resin containing 4-META (Super bond C & B, Sun Medical) and the hydrophillic orthodontic resin (Enlight, Ormco) as an adhesive. Prior to bonding, tooth surfaces were acid-etched and stainless steel surfaces were polished (NP), roughed by sandblasting (NS) and welded with stainless steel mesh also roughed by sandblasting (MS). Measurements of the bond strength and SEM observations of the bond failure interface were performed for their butt-jointed specimens after water immersion at 37°C.
As the results, initial bond strength for NP was drastically decreased by water immersion for 24 hours, and the bond failure occurred at the stainless steel surface. On the other hand, the bond strength for NS and MS were maintained after 4 week water immersion, and the bond failures were cohesive of the adhesive. That is, this adhesive has enough bond durability to enamel, but poor to a smooth stainless steel surface due to the water penetration through the adhesive layer and tooth structure. These results suggested the failurewould happen at the resin-stainless interface with less damages of tooth-resin interface when debonding the brackets.
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Bonding abilities of one-step bonding systems with different restorative materials
Hikaru SATO, Masashi MIYAZAKI, Tomomi SATO, Takeshi YOSHIDA, Jun HIGAK ...
2003 Volume 21 Issue 3 Pages
186-195
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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The purpose of this study was to evaluate bonding abilities of two one-step bonding systems with the combination of different type of restorative materials. Bovine enamel and dentin surfaces were prepared and 5 different products of resin composites and a lightcured glass ionomer cement were bonded with the adhesives. Specimens were stored for 5, 60 min and 24 h in 37°C distilled water and then tested on a shear mode at a cross-head speed of 1.0 mm/min. After 24 h storage in water, no significant differences in bond strength were observed among the restorative materials tested. For the specimens measured at 5 or 60 min, significant differences in bond strength were observed. From the results of this study, it was indicated that the bonding ability of the bonding systems should be evaluated by bond strength obtained in the early stages.
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Determination of viscosity of various resin pastes
Seiichi FUJII, Masashi MIYAZAKI, Keisuke IWASAKI, Ko HINOURA, Takeshi ...
2003 Volume 21 Issue 3 Pages
196-206
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Flowable resins have been developed to design to have flowability. Though there are many reports about the flow properties of the flowable resins, little information about their viscosities is available. The purpose of this study was to know the viscosities of several flowable resins by use of a Rheometer (DynAnalyser DAR-100, Jasco International). From the results of this study, the viscosities measured were different among the materials tested. It is indicated that the viscosity measurements are useful tool for determining handling properties of the flowable resins in clinics.
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Shigetaka TOMODA, Takako YAMANE, Toshiyuki WATANABE, Kousei MURATA, Ma ...
2003 Volume 21 Issue 3 Pages
207-215
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Light-emitting diode (LED) curing unit has been introduced in recent years. The most beneficial feature of LED is that it is small and light enough to operate compared with other conventional visible light-curing unit. In addition, it has also many other interesting features. However, there are few studies and clinical experiences reported. The purpose of this study was to investigate the mechanical properties of composite materials cured by a LED curing unit compared with those of cured by a halogen light-curing unit and xenon light-curing unit. A LED light-curing unit, Luxomax (Akeda, abbreviated to LUX), a conventional halogen lamp light-curing unit, XL 3000 (3M, abbreviated to XL) and a xenon light-curing unit, Credi 8000 (3M, abbreviated to CR) were tested in this study. The curing deph, bi-axial flexural strength and micro-tensile bond strength to dentin of resin composite were measured.
The results were as follows:
The curing depth of the specimens cured by LUX was significantly less than those cured by XL and CR in any irradiation time. The bi-axial flexural strength of specimens cured by LUX was equal to or significantly lower than those cured by the XL and CR. The microtensile bond strength of specimens cured by LUX was equal or inferior to those cured by the XL and CR.
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Marginal gap formation of composite inlay restoration and their mechanical properties
Masao IRIE, Rosalina TJANDRAWINATA, Kazuomi SUZUKI
2003 Volume 21 Issue 3 Pages
216-221
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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This study examined marginal gap formation of composite inlays using a new luting cement (Ionotite F, Tokuyama Dental) and two luting cements (Vitremer Luting Cement Fast Set: 3M ESPE, Fuji Luting S: GC; as controls). This study also examined the shear bond strength to dentin substrate, the flexural properties (strength, modulus of elasticity and fracture of work) and the change of weight of these luting cements in water, which may influence the gap formation.
The sum of marginal gap width and the value of shear bond strength were no significant difference among three luting cements. The flexural strength of Ionotite F was no significant difference compared with for Vitremer Luting Cement Fast Set. The change of weight of Ionotite F was significantly smaller than those of the two luting cements.
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Adhesion to enamel margins
Masao HANABUSA, Naotake AKIMOTO, Takatsugu YAMAMOTO, Mayuko HARA, Masa ...
2003 Volume 21 Issue 3 Pages
222-232
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Recently, self-etching systems have become widely accepted and used in clinical practice. However, it has been suggested that the
in vitro enamel bond strength of self-etching system is lower than those obtained with total etch system. The purpose of this study wa to evaluate one-year clinical performance of adhesion to enamel margin with five selfetching systems. A total of 99 restorations were placed with self-etching systems (Clearfil Mega Bond, Unifil Bond, Imperva Fluoro Bond, AQ Bond and One-up Bond-F) and Total etch system (All Bond One-step). Restorations were assessed in 4 categories: marginal discoloration, marginal integrity, secondary caries and pulpal response according to modified USPHS criteria. Assessments were done immediately after placement and 1-year. There was no pulpal response and secondary caries at 1-year recall period. Fortynine restorations were showed slightly marginal changes. It was concluded that the clinical assessments of pulpal response and secondary caries of five self-etchng systems were excellent after 1-year placement. Although, some marginal changes were seen during the clinical trials, these changes were not severe as clinical conditions requiring replacement from recurrent caries. Clinically, these data demonstrate that the adhesion to enamel of self-etching systems were acceptable to adhesive restoration in human teeth.
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Jumpei SUGIZAKI, Makoto MORIGAMI, Masaya KONDO, Satoshi FUJIWARA, Naok ...
2003 Volume 21 Issue 3 Pages
233-242
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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A newly designed one-bottle/one-step type resin bonding system based on the conventional “Xeno” technology has been developed by Dentsply Sankin Co. Ltd. The purpose of this study was to evaluate the bond strength, marginal adaptation with this brand-new system and to observe the interfacial ultrastructure under the FE-SEM. Firstly, the tensile bond strength to bovine tooth was measured after 24 hours. Secondly, the resin-tooth interface was observed under the FE-SEM after the Ar-ion beam etching for 35s using the flat enamel/dentin surfaces or cavities after dentin caries removal of the human extracted teeth. In addition, the microleakage assessment was performed after thermo-cycling for 10, 000 cycles. The tensile bond strength of this system was higher than 20MPa to the enamel and about 15MPa to the dentin, which was not significantly different from Clearfil Mega Bond. The junction between the resin and the tooth tissue was very tight, and in the superficial dentin layer, the hybrid layer about 0.5-1.0μm thick was clearly observed. And this system revealed comparatively good marginal adaptation after thermo-cycling. It was suggested that the brand-new system will be promising as a next generation resin bonding system.
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[in Japanese]
2003 Volume 21 Issue 3 Pages
243-245
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Takashi INOUE
2003 Volume 21 Issue 3 Pages
246-254
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Yoshiroh KATOH, Masaya SUZUKI, A. Moritz, W. Kluger
2003 Volume 21 Issue 3 Pages
255-259
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Lavage of the tissue interface
F. Cox Charles
2003 Volume 21 Issue 3 Pages
260-265
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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Morioki FUJITANI
2003 Volume 21 Issue 3 Pages
266-270
Published: December 15, 2003
Released on J-STAGE: June 07, 2011
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