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Volume 59 (1992)
- Issue 4 Pages 607-
- Issue 3 Pages 553-
- Issue 2 Pages 301-
- Issue 1 Pages 1-
Volume 59, Issue 2
Displaying 1-15 of 15 articles from this issue
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Teruo Amagasa1992 Volume 59 Issue 2 Pages 301-306
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (1112K) -
Effect of Difference of Opening Distance on Mandibular PositionHisao Ishiwata1992 Volume 59 Issue 2 Pages 307-330
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn the hemimandibulectomy patients the mandible is severely deviated and the occlusion is unstable, therefore the prosthodontic treatment for these patients is generally not successful.
To investigate the stability of the mandibular position in occlusion of these patients, the differences of the range and the position of the mandible in occlusion between during the 5-mm opening and closing movement and during the 10-mm movement were analyzed three-dimensionally with the Jaw Movement Analyzer MM-JI-E.
In this study, four hemimandibulectomy patients were selected as the subjects.
The findings were as follows:
1. In three subjects, the range of the mandible in occlusion during the 10-mm opening and closing movement was larger than that during the 5-mm movement in almost all directions. On the contrary in one subject, the range of the mandible in occlusion during the 10-mm opening and closing movement was smaller than that during the 5-mm movement in almost all directions.
2. The relative relationship of the mandibular position in occlusion during the 10-mm opening and closing movement to that during the 5-mm movement varied in four subjects.
In one subject, the mandible rotated horizontally towards the outside and moved upward.
In another subject, the mandible rotated horizontally towards the inside and moved downward.
In the other subject, the mandible moved inward and upward.
In the other subject, the mandible moved outward and downward.View full abstractDownload PDF (9597K) -
Satsuki Hagiwara, Ferando Sato, Elizabeth Boutsi, Masahiro Iida, Tomok ...1992 Volume 59 Issue 2 Pages 331-350
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe aim of the present study was to monitor longitudinally the clinical and microbiological parameters after root debridement in order to determine the factors affecting successful and unsuccessful results. Nine patients with moderate and severe periodontitis participated. Four sites of single root with over 5-mm periodontal pockets in each quadrant were selected. The oral hygiene was controlled in all patients, then root debridement was performed without anesthesia at the three sites of the quadrants every two weeks during eight weeks. The clinical parameters consisted of plaque index, gingival index, probing depth, clinical attachment level, bleeding on probing, tooth mobility and the value of gingival crevicullar fluid (GCF) . The microbiological parameters such as percentages of cocci, motile rods, non-motile rods and spirochetes and the number of microorganisms were examined and the percentages of black pigmented Bacteroides (BPB) and Actinobaccilus actinomycetemcomitans as well as the number of anaerobic colonies were counted. The results demonstrated that a reduction in the probing depth was observed in all sites except four. The successful sites clinically showed a decrease of the probing depth and GCF value and, microbiologically, reduced percentages of the spirochetes and BPB. The results indicated that the decrease of the probing depth and GCF under 50 Periotoron units in coincidence with the bacterial reduction can be used to determine the successful response of root debridement.View full abstractDownload PDF (3215K) -
Tatsuo Kawamoto1992 Volume 59 Issue 2 Pages 351-383
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIt is very important for orthodontics to investigate the bone remodelling pattern in the area of the attachment of the masticatory muscles induced by the changing muscular function. In the present study, the insertion pattern of Sharpey's fibers and the bone structure are comparatively studied on the temporalis and the masseter muscles macroscopically, light microscopically and electron microscopically, respectively.
The following results are obtained:
1) The periosteum on the squamous part of the temporal bone is thinner, while the one on the lower ridge of the zygomatic arch is relatively thicker.
2) The fine and loose Sharpey's fibers are found mostly on the squamous part of the temporal bone, while the ones on the lower ridge of the zygomatic arch are relatively coarse and dense.
3) Comparing with the squamous part of the temporal bone, the fibrous bone is thinner and also few reversal lines and resting lines are observed at the lower ridge of the zygomatic arch. These findings seem to prove the fact that the bone remodelling proceeds frequently within the limited narrow area.
These differences are directly due to the differences of the anatomical site and the muscular function.View full abstractDownload PDF (31900K) -
Yujiro Sakamoto1992 Volume 59 Issue 2 Pages 384-438
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSTo understand the muscle as a locomotorium, I observed the structure of the connective tissue sheaths (the endomysium, the perimysium and the epimysium) in the mature rat lateral pterygoid muscle.
The following results were obtained using the macroscopy and light and electron microscopy.
The lateral pterygoid muscle consists of two parts. The superior head originates from the basisphenoid and is mainly inserted into the articular disk and capsule. The inferior head originates from the lateral pterygoid processus and is mainly inserted into the condylar processus of the mandible.
The perimysium is thick and bound the fasciculus secondarily as sheaths near the insertion of the superior head. The collagenous fibers are very fine in the endomysium. The collagenous fibers that make the connective tissue sheaths arrange on a skew against the muscle fibers, but parallel around the origin and the insertion.
It seems that the connective tissue sheaths in the rat lateral pterygoid muscle, in view of the morphology, retain the forms of fasciculus, act as the runways for the muscle fibers in time of expansion and contraction and offer spaces for the attachment of the muscle fibers.View full abstractDownload PDF (38830K) -
Jirou Orihara1992 Volume 59 Issue 2 Pages 439-455
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSBis-GMA and epoxy resins are known to cause allergic reactions in some patients. The purpose of this research was to investigate the sensitizing capacity, cross-reactivity and antigenic determinants of bisphenol A (BPA), a major constituent of Bis-GMA and BPA type epoxy resins. Anti-BPA antibodies were prepared from mice injected with BPA-ovalbumin conjugates (BPA-OVA), and the reactions of the structurally BPA-related compounds were compared with that of BPA using these antibodies by the enzyme immunoassay (ETA) and EIA inhibition test. The findings are as follows:
1) Injection of BPA failed to generate anti-BPA antibodies. However, injection of BPA-OVA was effective in producing antibodies strongly reacting with BPA.
2) Polyclonal anti-BPA antibodies cross-reacted with bisphenol B (BPB), p-isopropylphenol (IPP), diethylstilbestrol (DES) and 2, 4-dinitrophenyl (DNP) .
3) Five kinds of monoclonal anti-BPA antibodies were obtained. These monoclonal antibodies reacted specifically with BPA and moderately cross-reacted with IPP, DES and BPB, but not with DNP.
The results suggest that BPA-OVA is capable of eliciting anti-BPA antibody production in mice and that the antigenic determinant of BPA is the structure of one central carbon atom, covalently bound with two phenyl groups and two methyl groups.View full abstractDownload PDF (3144K) -
Nickel Dissolution, Toxicity and Distribution in Cultured CellsHideya Hamano1992 Volume 59 Issue 2 Pages 456-478
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn an oral environment, minute amounts of constituent metals dissolve from the surfaces of restorations. The uptake of the metals through the mucosa may cause systemic or local effects. The purpose of this study was to investigate these effects and mechanisms, focusing on the nickel as a dental metal.
A nickel-chromium dental casting alloy was stored in 3 immersion solutions for 4 weeks and the amount of nickel dissolved was measured. NiC12 was administrated to the cultured medium to examine the cytotoxicity for HeLa cells and periodontal ligamentderived cells as well as the nickel distribution in the HeLa cells.
The results were as follows:
1. The amounts of nickel released from the alloy were 1.2. μg/cm2 (human saliva), 2.0. μg/cm2 (PBS (-) ) and 2.5. μg/cm2 (MILLI-Q water) .
2. 3.0mM NiCl2 showed a large cytotoxicity resulting in the cell growth rate and morphological changes.
3. Incubated for 72 hours in 0.15mM NiCl2, the amount of nickel in the 106 cells was 20 ng. After 24 hours of incubation with NiCl2, and the following 72 hours without NiCl2, the amount of nickel had decreased, but 30% still remained.
4. Incubated for 72 hours in 0.15mM NiCl2, 65% of the nickel in the cells was bound by the soluble fraction.
These results suggest that nickel released from the oral prosthesis may be sequestered for a long term in the cells and possibly causes some effects.View full abstractDownload PDF (12630K) -
Ceancheng Chen1992 Volume 59 Issue 2 Pages 479-511
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe objective of this study is to compare the degree of the occlusal-bearing ability of 2-piece apatite implant to that of natural dentition.
It is conducted by placing implants at M2 and M2 areas of adult monkey. Four months later, the occlusal vertical dimension was raised to apply the occlusal force only on the implants by inserting connected crowns on M3M2M1 and M1M2M3. Three months after loading, the tissues surrounding the implants and the antagonist teeth were histologically examined.
Results:
The antagonist teeth:
The connected antagonist teeth show much bone resorption on the inner surface of the alveolar wall and the roots are partly in direct contact with the bone and intruded.
Implant:
1. Due to the resorption from extraction, enhanced remodeling is seen in the compact bone of the experimental site. The degree of remodeling is higher toward the coronal direction.
2. Realigned functionally oblique toward the implant, thickened trabeculae, of both the lamellae and woven bone, supported the implant.
3. Bone formed widely on the buccal and lingual surfaces of the compact bone near the implant. In the areas of close to the direct contact of the implant to the compact bone, remodeling with osteon realignment in the axial direction was observed.
4. Most embedded surfaces of the implant were covered and bound to the bone.View full abstractDownload PDF (23373K) -
Yoshiaki Ono, Yu-Faang Lin, Hideo Iijima, Zenzo Miwa, Masaki Shibata1992 Volume 59 Issue 2 Pages 512-517
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSMastication is a developmental function. It matures through learning experiences. The biting force is one of the components of masticatory function. The biting force increases with age. During the developmental stage, it is believed feasible to enhance the maturation of the masticatory function by increasing the biting force.
The previous results of masticatory training for adults and school children had revealed 20% to 30% increase of the biting force.
In this study, masticatory training with specially fabricated chewing gum for young preschool children was performed. The subjects were 5 males and 5females from 3 years old to 5 years old. These children were instructed to bite onthe chewing gum for 5 minutes, 2 times a day, for 3 months. The results show that there was a 94% average increase of biting force after 3 months of training. It was also noted that the rate of the increase of the biting force was remarkable during the firs tmonth of training.View full abstractDownload PDF (4244K) -
Influence of Undercuts on Dimensional AccuracyKuniko Wada1992 Volume 59 Issue 2 Pages 518-540
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this research was to evaluate the clinical acceptability of various impression thechniques by comparing the dimensional accuracy of their working casts.
An original metallic model was designed for this experiment. It has reference points to overlap and compare the master model and the working casts for measuring their dimensional accuracy under the same condition. The amount of distortion in each area of the working casts was examined by the measuring points within the model.
The master model simulated an abutment for a full veneer crown with undercuts between the adjacent teeth. It was planned so that the amount of undercuts and distances between the adjacent teeth could be changed.
As a result, a small distortion of the working casts due to the undercuts was observed by the technique using an individual tooth tray and polysulfide rubber base impression material.
There was no significant dimensional change in the working casts made with silicone rubber base material.
For the working casts made by hydrocolloid-alginate combination technique, the dimensional change was greater and distortion was observed in the abutment cast when the undercuts of the adjacent teeth were great. However, the distortion was less when the undercuts were small.View full abstractDownload PDF (10155K) -
[in Japanese], [in Japanese]1992 Volume 59 Issue 2 Pages 541
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (201K) -
[in Japanese], [in Japanese], [in Japanese]1992 Volume 59 Issue 2 Pages 542
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (2089K) -
[in Japanese]1992 Volume 59 Issue 2 Pages 543
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (2120K) -
[in Japanese], [in Japanese]1992 Volume 59 Issue 2 Pages 544
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (246K) -
[in Japanese]1992 Volume 59 Issue 2 Pages 545
Published: 1992
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (2159K)
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