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Mitsuru Atsuta, Takuo Tanaka, Sakari Hikage, Yoichi Uchiyama
1984 Volume 28 Issue 5 Pages
767-774
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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4-Methacryloxyethyl trimelliate anhydrite (4-META) had been reported to be a suitable monomer which promotes adhesiveness of PMMA rods with tooth substrates and dental gold alloys.
Film thickness, tensile adhesive strength and solubility of a new adhesive resin cement including 4-META were measured after cementing full coverage crown on an abutment tooth, and the values were compared with those of zinc phosphate, polycarboxylate, glass ionomer, epoxylite resin, reinforced zinc oxide eugenol cements.
The results were as follows:
1) The film thickness of the adhesive resin cement on the margin was about 75 μm as cast, but it was reduced to 26 μm by adding vent of internal groove.
2) Force required to dislodge crown cemented by the adhesive resin cement was about 100kg.
3) Force required for separation of the cement resin crown-tooth assemblies was about 26kg after adding thermal cycles of 200 times. Dye penetration was to located to the enamel of the margin.
4) Scanning electron microscopy evaluation of the solubility on margins of crowns showed that the adhesive resin cement was tolerable in 1/100N lactic acid solution for 12 hours, although most of cements was decayed remarkably.
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Akio Takaki, Eriko Fujiyama, Hiroshi Shimizu, Takuo Tanaka, Mitsuru At ...
1984 Volume 28 Issue 5 Pages
775-780
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Mitsuru Atsuta, Takuo Tanaka
1984 Volume 28 Issue 5 Pages
781-787
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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The new type resin which composed with crosslinked monomer and a prepolymerized composite filler, a so-called organic filler, improved remarkably hardness and abrasion resistance of crown and bridge resins. In addition, an adhesive opaque resin containing 4-META could bind firmly a resin to a metal frame without any mechanical retentive devices. In this study, the fracture strength of resin veneered crowns fabricated with these new materials was compared with that of the bonded porcelain veneer crown by impact and peel test. The results showed the resin veneered crowns was superior to the bonded porcelain veneer crowns about impact and peel resistance.
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Part 1. Deduction of a Correlation Formula
Sumiya Hobo, Hisao Takayama, Motohito Tabata
1984 Volume 28 Issue 5 Pages
788-795
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Part 2. Application for Checkbite Method
Sumiya Hobo, Motohito Tabata, Hisao Takayama
1984 Volume 28 Issue 5 Pages
796-809
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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A Comparison Between Single Crystal Sapphire and Other Materials
Yasumasa Akagawa, Masaki Hashimoto, Noriaki Kondo, Toshikado Matsumoto ...
1984 Volume 28 Issue 5 Pages
810-815
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Mitsuru Atsuta, Manabu Kuroiwa
1984 Volume 28 Issue 5 Pages
816-824
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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New technic for fabrication of resin veneered crown without any mechanical retentive devices onto the metal frame was introduced by using adhesive opaque-resin including 4-META. Prognosis of these veneer crowns was followed during half to two years. The fall percentage of veneered resin in 257 teeth of 106 patients was about 9% in total facing crowns and pontics. The 15% of the upper veneered crown was rather high as compared with that of lower ones, although it was due to the incisal edges or buccal cusps were not covered withmetal frame. The results of prognosis suggests that using together the mechanical retentive devices is essensial clinically, even if this adhesive opaque-resin showed high retentive strength in vitro.
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Part 1. Questionnaire Inquiry and Material Reference
Naotaka Tajima, Michiko Aizawa, Masako Shimizu, Katsuhiro Shiihara, To ...
1984 Volume 28 Issue 5 Pages
825-835
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Hitoshi Kato, Takahiro Sato, Hiroyuki Miura, Keiichi Yoshida, Takayosh ...
1984 Volume 28 Issue 5 Pages
836-843
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Part 1. Dimensional Changes of High heat Investment and Porcelain
Hide Yamamoto, Kiyotaka Munakata, Yoshinobu Itakura, Takatsune Ohtomo, ...
1984 Volume 28 Issue 5 Pages
844-854
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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In order to know the possibillity of direct firing method of porcelain jacket crown without foil on a refractory die, dimensional changes of 12 investments for high fusion alloy and of 1 aluminous porcelain were investigated. The following results could be drawn.
(1) Refractory matrix should not shrink under primary size on first firing and show no dimensional change after cyclic heat.
(2) Porcelain should show satisfactory sintering on early period of cyclic heat and should have equal or a little more thermal expansion than refractory matrix.
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Part 1. Denture Vibration in Relation to Occlusal Sound and Denture Movement
Yoshinobu Maeda, Masatoshi Okada, Akihiko Makishi, Goro Nishigawa, Tak ...
1984 Volume 28 Issue 5 Pages
855-859
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Kazuhiko Suese, Keizo Iwai, Jun Kakuta, Kiyoshi Ohtsuka, Fujiyoshi Sak ...
1984 Volume 28 Issue 5 Pages
860-867
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Part 1 Effect of pH in Saline Solution
Naofumi Shigeto, Toshiyuki Yanagihara, Norimitsu Anabuki, Hiroshi Ishi ...
1984 Volume 28 Issue 5 Pages
868-874
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Taizo Hamada, Naofumi Shigeto, Norimitsu Anabuki, Hiroshi Ishida, Hiro ...
1984 Volume 28 Issue 5 Pages
875-881
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Masari Ohnuki, Tsutomu Okajima, Yasunobu Sakuma, Hiroyoshi Takahashi, ...
1984 Volume 28 Issue 5 Pages
882-894
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Part 1.Occlusal Sound Waves During Tooth Tapping in Subjects with Natural Dentition and in Patients with Fixed or Removable Prostheses
Hideaki Okane, Kazuo Matsuda, Yuzo Hiraoka, Yoshihito Kayano, Yasuteru ...
1984 Volume 28 Issue 5 Pages
895-904
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Part 2. Detectable Level of Occlusal Sound Waves for Occlusal Interferences and Characteristics of an Occlusal Sound Monitor
Hideaki Okane, Kazuo Matsuda, Yuzo Hiraoka, Tooru Nagasawa, Hiromichi ...
1984 Volume 28 Issue 5 Pages
905-916
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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Compared with Schüller's Radiogram
Hironobu Sato, Tetsunori Fujii, Hiroyuki Fujii, Naoyuki Yamada
1984 Volume 28 Issue 5 Pages
917-926
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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A comparison study of the information obtained from Schaller's radiogram and sagittal simultaneous multisection tomograms of the temporomandibular joint was made. The subjects were 18-male and 43-female patients with TMJ disorders.
By Schüller's radiogram, 79 condyles (64.8%) with no particular change, 32 condyles (26.2%) with ill-defined change and 11 condyles (9.6%) with abnormal change were found. By sagittal tomograms, however, altered distribution was obtained as follows: 82 condyles (67.2%) with no particular change, 6 condyles (4.9%) with ill-defined change and 34 condyles (27.9%) with abnormal change.
Out of 79 condyles with no particular change by Schtiller's radiogram, morphological changes were detected in 4 condyles (5.1%) by sagittal tomograms. Moreover, out of 32 condyles with ill-defined change by Schaller's radiogram, morphological changes were clearly detected in 21 condyles (65.2%) by sagittal tomograms. The ratio of these diffent radio-diagnosis were about 31%.
In abnormal 34 condyles (43 sites), according to the diagnosis from sagittal tomograms, the highest occurence was erosion (52.9%, 18 condyles), followed by marginal proliferation (23.5%, 8 condyles) and eburnation (20.6%, 7 condyles).
In the result, informations of the TMJ sagittal tomograms were superior to those of the Schaller's radiogram and the tomogram should be available for prosthodontic diagnosis and treatment of the patients.
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Part 1. Rolled Denture Base Made by Electrohydraulic Wire Explosion Metal Forming
Naoyuki Shinohara, Hideyoshi Akita, Osamu Tojinbara, Isoko Okamura, Ta ...
1984 Volume 28 Issue 5 Pages
927-930
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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The rolled denture bases have possessed many advantages compared with cast bases. However, when these are prepared, the adhesion to acrylic resin will be attended with much difficulty.
So, the authors discussed a technique for increase of adhesive strength of metal plates to acrylic resins.
The technique, discussed in this investigation, were various surface-treatments of the rolled denture bases by the electrohydraulic wire explosion. The rolled denture bases was 18-8 stainless steel, and electrohydraulic wire explosion metal was Ni-Cr alloy (Ni 83, Cr 15, Ag 1, etc. 1). The adhesive strength in this report, which measured using Instron testing machine, was the shear strength'of Plate Resins-(Bio-Resin and Metadent) torolled denture basas.
As a result, the best technique of various surface treatments by electrohydraulic wire explosion, as regards of adhesive strength, was 3-7 μ NiCr alloy particles spray for Bio-Resin, and 7-20 Ni-Cr alloy particles spray for Metadent.
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Part 2. Adhesive Shear Strength between Ni-Cr Alloy Surface-Treated by Wire Explosion Spray and Adhesive Resin (Super Bond C & B)
Naoyuki Shinohara, Osamu Tojinbara, Hideyoshi Akita, Teiji Kakiuchi, T ...
1984 Volume 28 Issue 5 Pages
931-935
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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The adhesion bridges and splints have possessed many advantages compared with conventional appliances. However, when they are used for long period in oral cavity, the separation of metal base and resin were created. So, the authors discussed a technique for promoting the adhesive strength to metal base, by applying the adhesive resins.
In this study, the surface treatments by electrohydraulic Ni-Cr wire explosion were employed, as the technique for increase of adhesive strength of the adhesive material (Super Bond C & B) to Ni-Cr alloy base metal. The shear strength was measured, and the possibility to clinical application was discussed.
As the result of this investigation, the best technique of various surface treatments by electrohydraulic Ni-Cr wire explosion, as regards of adhesive strength, was 3-8μ Ni-Cr alloy particles spray.
On the other hand, authors discussed the thickness of sprayed layer by electrohydraulic Ni-Cr wire explosion, in consideration of the 20-100μ capsule thickness of Super Bond C & B, microscopic observation and roughness of Ni-Cr alloy. Because Ni-Cr alloy particles were sprayed the inside surface of metal castings by electrohydraulic wire explosion.
In conclusion, it can be found that the surface treatment sprayed by hydraulic Ni-Cr wire explosion was clinically favourable when 3-8μ Ni-Cr particles sprayed.
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Part 3. Adhesive Shear Strength between Ni-Cr Alloy Surface-Treated by Wire Explosion Spray and Adhesive Resin (Panavia)
Naoyuki Shinohara, Hideyoshi Akita, Osamu Tojinbara, Yoshito Minesaki, ...
1984 Volume 28 Issue 5 Pages
936-938
Published: October 01, 1984
Released on J-STAGE: August 10, 2010
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In the second report, it was found that the adhesion bridges and splints prepared by a method of electrohydraulic wire explosion could be sufficiently applied in clinical cases. In this report, therefore, the methods for promoting the adhesive strength of the adhesive resin (Panavia) to metal base were discussed. And it was examined whether the components of the two Ni-Cr alloys base metal affected of not the adhesive strength.
The mean adhesive strengths of Panavia under shear to Ni-Cr alloys were relatively small compared with Super Bond C & B. Furthermore, there was difference in the shear strength between the two Ni-Cr alloys.
However, the shear strengths were 110.0-154.3 kg/cm
2From these results, it can be seen that the property of Panavia is clinically favourable since it is considered that Panavia has some surpassing features-the thin capsule of 19μ thickness, the easy manipulation, and the low adsorption. And it can be found that the surface treatment by electrohyraulic Ni-Cr wire explosion is clinically favourable irrespective of the compornents of Ni-Cr alloys.
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