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Volume 64 (1997)
- Issue 4 Pages 473-
- Issue 3 Pages 397-
- Issue 2 Pages 193-
- Issue 1 Pages 1-
Volume 64, Issue 3
Displaying 1-10 of 10 articles from this issue
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Atsushige Sato1997 Volume 64 Issue 3 Pages 397-404
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
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Makoto Shiota, Shin-ichi Ohno1997 Volume 64 Issue 3 Pages 405-412
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe object of this investigation was to analyze occlusal force in patients applied an implantsupported prosthesis. The occlusal force was measured on four free end saddle patients applied 10 dental implants (F. E.) and two bounded saddle patients 4 dental implants. The pressure sensitive sheet and the image scanner (Dental Prescale 50H type R and Occluzer FPD 703, Fuji Photo Film Co.) were used.
The occlusal force (O. F.) occurred in implanted portion was almost the same as that on a natural tooth. O. F. and O. F. bearing rate (B. R.) on the posterior dentitions applied implants tended to increase toward the distal side. The total O. F. had a tendency to increase after applying implant-supported prosthesis, and comparing implanted side with non-implanted (natural teeth) side, B. R. was equilibrium. On the other hand, occlusal contact areas, O. F. and B. R. were decreased at the most distal tooth of residual dentition on the implant side of F. E..View full abstractDownload PDF (1924K) -
Hongzhen Li1997 Volume 64 Issue 3 Pages 413-426
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIn order to investigate the molecular mechanism of the retinoblastoma protein, pRB, in neuronal differentiation, the accumulation of the hypophosphorylated pRB in PC12 cells stimulated by nerve growth factor (NGF) was measured by the western blotting method. NGF induced the accumulation of the hypophosphorylated pRB in 30 min. and maximized the level at 12h. Viral Ki-ras constitutively induced hypophosphorylation of pRB. A dominant negative form of c-Ha-ras suppressed the induction of the hypophosphorylation of pRB by NGF, but not by CAMP. This result is consistent with the idea that NGF induces hypophosphorylation of pRB through the Ras signaling pathway. The reduction of cdk2 activity caused by increment of p21 inhibitor may be a mechanism for hypophosphorylation of pRB. Furthermore, microinjection of a monoclonal antibody for the hypophosphorylated pRB blocked the neurite outgrowth initiated by NGF. It was also found that Hsc 71 interacted with hypophosphorylated pRB in vitro as well as in vivo in neuronal PC12 cells stimulated by NGF. These results suggested the dual role of pRB in the withdrawal of cells from the cell cycle and neuronal differentiation in PC12 cells.View full abstractDownload PDF (11545K) -
Nobuyoshi Motohashi, Atsushi Nunota, Takayuki Kuroda1997 Volume 64 Issue 3 Pages 427-435
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to introduce our newly-developed CAM system for dental model and to examine the shape reproducibility and measurement reliability of the CAM modelling.
The system is composed of a measuring unit, which obtains three-dimensional shape information from the dental model using laser scanning, and an engineering workstation, which creates a three-dimensional graph of the dental model. Output module program which can directly process and output the three-dimensional shape data to the wide use modeling systems was developed as the software of this CAM system.
Four different CAM models, that, WAX model, STL model, FDM model, and SL model, were made based on the graph of the dental model taken from a mandibular prognathic patient. The measurement reliability of each CAM model were evaluated using a contact three-dimensional measurement unit.
All CAM models except a WAX model demonstrated good shape reproducibility without a blind area, suggesting no problem of the three-dimensional shape data and the output module program. Measurement reliability of each CAM model was 0.12 ±0.08 mm in graph, 0.25 ±0.05 mm in WAX, 0.28± 0.16 mm in SL, 0.31± 0.15 mm in FDM, and 0.39 ±0.18 mm in STL.
These results suggested clinical feasibility of this system in accordance with electronic storage of medical information.View full abstractDownload PDF (7738K) -
Nobuyuki Yoshitomi1997 Volume 64 Issue 3 Pages 436-453
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to measure the actual anterior occlusal contacts in complete denture during mastication and discuss the relation between anterior occlusal contacts and masticatory movements.
The actual anterior occlusal contacts were measured electrically with metal occlusal surfaces in five edentulous patients. These metal occlusal surfaces could be removed and changed into two types of occlusion.
The masticatory movements were measured by Sirognathograph® for seven edentulous patients. The types of anterior and posterior occlusions were changed, and the masticatory movements were analyzed for each of the four types of occlusion.
The results were as follows
1. Anterior occlusal contacts were found during mastication, but not during tapping, in bilateral balanced occlusion.
2. The frequency of anterior occlusal contacts during mastication was increased in nonbalanced occlusion.
3. The frequency of occlusal contacts at the canine on the chewing side was increased by continuing of mastication, but was not increased at the canine on non-chewing side.
4. The stability of the denture tended to be lost by eliminating the anterior occlusal contact, judging from the rhythm of masticatory movements.
This study suggested that anterior occlusal contacts are necessary for the functional harmony of complete denture during mastication.View full abstractDownload PDF (3835K) -
[in Japanese], [in Japanese]1997 Volume 64 Issue 3 Pages 454
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]1997 Volume 64 Issue 3 Pages 455
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1997 Volume 64 Issue 3 Pages 456
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
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[in Japanese]1997 Volume 64 Issue 3 Pages 457
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (129K) -
[in Japanese], [in Japanese], [in Japanese]1997 Volume 64 Issue 3 Pages 458
Published: September 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (147K)
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