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Volume 19 (2001 - 200･･･
- Issue 4 Pages 235-
- Issue 3 Pages 181-
- Issue 2 Pages 77-
- Issue 1 Pages 1-
Volume 19, Issue 3
Displaying 1-6 of 6 articles from this issue
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Tohru Hayakawa, Hiroki Yoshida, Kimiya Nemoto2001 Volume 19 Issue 3 Pages 181-187
Published: December 15, 2001
Released on J-STAGE: June 07, 2011
JOURNAL FREE ACCESSIn this study, the effectiveness of self-etching primer treatment on the adhesion between 4-META/MMA-TBB resin to bovine enamel was investigated.
The self-etching primer was composed of Phenyl-P and HEMA. The concentration of Phenyl-P was varied from 5 to 30wt% and that of HEMA was 35wt%. The polished enamel surface was treated with self-etching primer for 30s. After drying, a stainless steel rod was adhered to the enamel using TBB-initiated 4-META/MMA resin. The tensile bond strengths were measured after 1 day immersion in 37°C water.
The bond strengths after 5wt% or 10wt% Phenyl-P self-etching primer treatment were significantly lower than that after phosphoric acid etching. The bond strengths were increased according to the increase of the concentration of Phenyl-P. The self-etching primer containing 30wt% Phenyl-P gave the highest mean bond strength of 15MPa, and there were no significant differences of the bond strengths between 30wt% Phenyl-P primer treatment and phosphoric acid etching. FE-SEM revealed that the decalcification degree by 30wt% Phenyl-P self-etching primer treatment was less than that by phosphoric acid etching.View full abstractDownload PDF (1355K) -
Complex in the Tooth of Beagle DogTakashi Inoue, Kenichi Matsuzaka, Masaki Shimono2001 Volume 19 Issue 3 Pages 188-199
Published: December 15, 2001
Released on J-STAGE: June 07, 2011
JOURNAL FREE ACCESSThe purpose of this investigation is to examine the effect of the 4-META bonding material/TMPT filler containing composite resin for the dentin/pulp complex using the beagle dog. Either 4-META-D resin and composite resin with TMPT filler or EG bond and composite resin with TMPT filler were applied in the dentin cavities. Eugenol and silicate cement were used as control materials. 7, 28 and 90 days after the expeiment, animals were sacrified and observed by light microscopy. As the result, 4-META-D/TMPT-A resin and 4-META-E/TMPT-F resin were shown to generate negligible leakage at the resin-dentin interface, and tooth pulp reaction which was histologically almost equivalent to the eugenol case was weaker than the silicate case. This study was supported by TDC/HRC982A01.View full abstractDownload PDF (2042K) -
Jumpei Sugizaki, Toshimoto Yamada2001 Volume 19 Issue 3 Pages 200-205
Published: December 15, 2001
Released on J-STAGE: June 07, 2011
JOURNAL FREE ACCESSAn experimental resin bonding system with a bactericidal effect and fluoride-releasing property has been developed by Kuraray. This system is a two-step type and the primer contains a bactericidal monomer, MDPB, which was directed by Dr. Tsuchitani at Osaka University and the bonding agent contains a sodium fluoride. The purpose of this study was to examine the interfacial ultrastructure between the resin and the intact enamel, intact dentin, and caries-affected dentin. The junction was very tight between the resin and the tooth tissue. With the polished specimens, the hybrid layer was not clearly observed at the resin-dentin interface, but after the argon ion etching, the clear hybrid layer below 1μm in thickness was demonstrated in the superficial dentin layer. It was concluded that this experimental system could be useful for the resin composite restoration.View full abstractDownload PDF (2160K) -
Masao Irie, Rosalina Tjandrawinata, Kazuomi Suzuki2001 Volume 19 Issue 3 Pages 206-213
Published: December 15, 2001
Released on J-STAGE: June 07, 2011
JOURNAL FREE ACCESSRecently there were two types of luting cements, one type (resin-modified glass-ionomer cement, Fuji Luting: GC) and the other type (resin cement, Chemiace II: Sunmedical, Bistite II: Tokuyama, XenoCem, Sankin) commercially available. The objectives of this study were to investigate the effect of 20, 000 thermocycles on the mechanical properties (flexural strength, modulus of elasticity and modulus of resilience) and on the swelling (dimensional and weight changes) of the new luting cements. And it was compared with those of a conventional resin-modified glass-ionomer cement (Fuji Plus: GC) and a conventional resin cement (Compolute: 3M ESPE).
The values of mechanical property after 20, 000 thermocycles of Fuji Luting were the worst in all cements, those of Bistite II were the greatest, and those of Chemiace II and XenoCem were the middle of between Fuji Plus and Compolute. The values of swelling after 20, 000 thermocycles of Fuji Luting were the largest in all cements and those of Bistite II were no significant difference compared with Compolute. Those of Chemiace II and XenoCem were the middle of between Fuji Plus and Compolute.View full abstractDownload PDF (872K) -
Ryunosuke Kazama, Masayoshi Fukushima, Masaaki Iwaku2001 Volume 19 Issue 3 Pages 214-219
Published: December 15, 2001
Released on J-STAGE: June 07, 2011
JOURNAL FREE ACCESSThe purpose of this study was to examine the effect of tooth preparation on marginal and internal fit of all ceramic crowns fabricated by dental CAD/CAM “CEREC 2” system. There were two test conditions for the margins as well as for the occlusal surfaces. Margin types were: a) horizontal and b) inclined. Occlusal surfaces were: a) flat and b) V shape. “Spacer” mode was set at 30μEm. Five specimens of each test condition type were prepared on the extracted human molars. All of the tested crowns were seated on the tooth preparations with adhesive resin cement. The specimens were cut mesiodistally at the center of tooth crown. The thickness of the adhesive resin cement layer on seven measured points on the cut surface was measured using a measuring microscope.
As a result, models with horizontal margin and flat occlusal surface presented the best conditions for crown fitting.View full abstractDownload PDF (1474K) -
Hideo Matsumura, Yohsuke Taira, Mitsuru Atsuta, Naomi Tanoue2001 Volume 19 Issue 3 Pages 220-224
Published: December 15, 2001
Released on J-STAGE: June 07, 2011
JOURNAL FREE ACCESSVeneer-metal interface integrity of composite veneered restorations was clinically assessed with the aim of evaluating bonding efficacy of an adhesive primer. Of the 103 materials examined, the 51 restorations were fabricated by use of a metal priming agent (VPrimer) at the composite-metal substructure interface, whereas the remaining 52 restorations were made without priming.After five and 10 years of observation, microfracture at the interface was evaluated. The results demonstrated that micro-fracture of the adhesively retained veneer was significantly less than the control for both after five (p=0.0019) and 10 years (p=0.0260). The differences between the two observation periods, however, were not statistically significant for both the primed (p=0.1418) and unprimed (p=0.6206) groups. It can be concluded that the use of the metal priming agent effectively enhanced veneer-metal interface integrity of restorations made of a microfilled composite (Dentacolor) and a silver-palladium-copper-gold alloy (Castwell M.C.12) in vivo.View full abstractDownload PDF (1360K)
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