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Volume 64 (1997)
- Issue 4 Pages 473-
- Issue 3 Pages 397-
- Issue 2 Pages 193-
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Volume 64, Issue 2
Displaying 1-15 of 15 articles from this issue
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Masaki Yanagishita1997 Volume 64 Issue 2 Pages 193-204
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
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Haruhiko Koyama1997 Volume 64 Issue 2 Pages 205-222
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSBone morphogenetic proteins (BMPs), members of a transforming growth factor-β (TGF-β) superfamily, are growth and differentiation factors which induce ectopic bone formationin vivo.Although many studies on osteoinductive properties of BMPs have been conducted, little is known about the downstream components in the signal transduction machinery, beyond the mechanism of BMP receptor activation.
In this study, the osteogenic effects by osteogenic protein-1 (OP-1, BMP-7) on osteoblastic cell line MC3T3-E1 and murine stromal cell line ST2 were investigated, especially focusing on differentially expressed genes induced by OP-1 using the differential display method.
The major findings were as follows:
1) Alkaline phosphatase specific activities of both MC3T3-E1 and ST2 increased in a dosedependent manner by OP-1 stimulation.
2) Northern analysis showed a significant increase of osteocalcin mRNA after 7 days of OP-1 treatment.
3) 77 genes, which were differentially expressed in MC 3 T 3-E 1 and ST 2 cells, were detected on differential display fingerprints after 16-hour treatment of OP-1.
4) Some of these clones showed high levels of identical to known genes.
5) One clone called ST3v, down-regulated in ST2 cells by OP-1 stimulation, was confirmed with quantitative RT-PCR.View full abstractDownload PDF (6177K) -
Kengo Miyashita1997 Volume 64 Issue 2 Pages 223-242
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was 1) to verify and apply a system to measure the threedimensional (3-D) movement of the upper and lower complete dentures and the movement of the mandible with six degrees of freedom, and 2) to analyze the relationship between denture movements and the path of closure of the mandible during functions. A 3-D motion capture system with four infrared TV cameras was used for this purpose. The loci of each of three targets on the subject's head, the upper dentures, the lower dentures, and the mandible were measured three-dimensionally. The relationship between the lower dentures and the mandibular movements was analyzed in the change of the inner product of normal vectors of the denture occlusal planes and mandibular planes.
The results were as follows:
This system could measure the denture mobility within 3.5 × 10-1mm in error. The mobility of the upper dentures had a correlation to the path of closure of the mandible regardless of the working side or nonworking side, and the lower dentures had a tendency to move toward the working side.View full abstractDownload PDF (2040K) -
Ichiro Sakamoto1997 Volume 64 Issue 2 Pages 243-276
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate the functional characteristics of human mandibular condyles from a morphological viewpoint. The structure of bone in the human mandibular condyles with osteophyte formation was observed macroscopically and microscopically and compared with that in the condyles which seemed to be normal.
The following observations were made:
1. Generally, it was observed that remodeling seemed to occur frequently in compact bone in the joint surface area of the mandibular condyle.
2. As the distribution of lamellar bone, nonlamellar, and bundle bone in the joint surface area changes, the compact bone seems to shift down and protrude forward.
3. In larger osteophytes, trabeculae of cancellous bone-like structure are observed. However, the basic structure of compact bone, including haversian system and the interlamellae structure, remains within the trabecullae. Therefore, observation revealed histologically that this is a compact bone. The macroscopical appearance of cancellous bone-like structure seems to be a result of functional demand.
4. It was concluded that the mandibular condyles accomodate the functional loads, and adoptational changes occur constantly in a stable manner.View full abstractDownload PDF (42791K) -
Masayoshi Itakura1997 Volume 64 Issue 2 Pages 277-295
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to examine the deviation of tapping points and electromyo-graphic activity in patients with cerebral palsy.
The subjects in this study were 6 normal subjects as the control group and 4 subjects with cerebral palsy as the patient group.
Twenty tapping movements and electromyographic activities in the bilateral masseter, anterior temporal, anterior digastric, and sternocleidomastoid muscles were recorded simultaneously with Gnatho-Hexagraph.
The results were as follows:
1. The differences of the opening distance and the cycle of tapping movements between the patient group and the control group were not significant, but coefficients of variation of the patient group were greater than those of the control group.
2. The deviations of tapping points in the patient group were significantly greater anteroposteriorly, laterally, and vertically than those in the control group.
3. In the patient group, electromyographic activities of masseter and sternocleidomastoid muscles during tapping movements were significantly greater than those in the control group.
4. In the patient group, electromyographic activities of the anterior temporal muscles were significantly less symmetric than those in the control group.View full abstractDownload PDF (4838K) -
Kazuhiro Izumi1997 Volume 64 Issue 2 Pages 296-315
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSTo investigate the effect of attention and novelty change of stimulus, modulation of evoked potentials following electrical tooth stimulus (EP-TS) and finger stimulus (EP-FS) by selective attention task were studied in 17 healthy adult volunteers.
Stimulus in this study were electrical tooth and finger stimulus, tone beep in constant (2.0 sec.) interval in random order, and delivering parcentage of tooth and finger stimulus was 10, 20, 30, 40, and 50% and tone beep was 80, 60, 40, 20, and 0 %.
The results were as follows
1) P2 latency and N2-P2 amplitude were increased while the subject's attention was toward each stimulus (attention), decreased while the subject's attention was not toward each stimulus (non-attention) at EP-TS and EP-FS.
2) When paying attention, P2 latency and N2-P2 amplitude were increased as delivering parcentage of tooth and finger stimulus were decreased.
These findings suggested that attention and novelty change of stimulus when paying attention were one of the factors that influence psychological factors and modulate EP-TS and EP-FS results.View full abstractDownload PDF (2023K) -
Akane Yamamoto1997 Volume 64 Issue 2 Pages 316-325
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to establish the assessment of gingival blood flow by laser Doppler flowmeter (LDF) using three parameters; Velocity, Volume, andFlow.
The gingival blood flow (GBF) at the labial attached gingiva of the maxillary incisor was measured by LDF in 10 healthy subjects, 3 men and 7 women. There were inter—and intra—individual variations in the obtained data. CV (coefficient of variance) values in each parameter of GBF while resting were as follows; Velocity: 10.2-34.5%, Volume: 7.7-45.6%, andFlow: 15.4-67.6%. The effects of changing position, cold stimulus, and the vasoconstrictor (0.1w/v% epinephrine) on GBF were assessed. All three parameters significantly decreased (p<0.01) after the cold stimulus. When the position was changed to the sitting position from the lying one, however, there were significant decrease in Velocity (p<0.001) andFlow (p<0.02) . On the other hand, the local application of the vasoconstrictor caused significant decrease inVolume (p<0.01) andFlow (p<0.01) . Consequently, Flowsignificantly decreased after all the stimuli in the present study, however, the change ofVelocityandVolumewere variable depending on the type of stimulus.
These results suggested that multiple parameters are needed for precise observation and analysis of blood flow.View full abstractDownload PDF (2327K) -
Goshi Kondo1997 Volume 64 Issue 2 Pages 326-347
Published: June 30, 1997
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSTo investigate the effects of the mouthguard on ventilation, including respiratory frequency (F), tidal volume (VT), oxygen uptake (VO2), respiratory exchange ratio (R), maximal oxygen uptake (VO2 max), and all-out time, an exercise tolerance test with modified Bruce's protocol was performed on 4 male subjects. Cumulative (cum.) value was also analyzed on F, VT, VO2, and R. Respective values with the mouthguard was compared to those without the mouthguard.
The results were as follows:
1. F, VT, VO2, and R did not show a certain tendency among the 4 subjects.
2. Cum. F at all-out time was decreased 2-8% among 3 subjects and increased 10% in 1 subject.
3. Cum. VT at all-out time was decreased 11-12% among 3 subjects and increased 21% in 1 subject.
4. Cum. VO2 at all-out time was decreased 2-11% among 3 subjects and increased 20% in 1 subject.
5. Cum. R at all-out time was decreased 3-13% among 3 subjects and increased 10% in 1 subject.
6. VO2 max showed significant increase in 1 subject.
7. All-out time was decreased 3-4% among 3 subjects and increased 9% in 1 subject.View full abstractDownload PDF (4373K) -
Byeonggap Choi1997 Volume 64 Issue 2 Pages 348-375
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSOcclusal registration for prosthodontic rehabilitation in dentulous hemimandibulectomy patient has various difficulties due to mandibular instability.
The purpose of this study was to find the occlusal contact position for remaining dentition to stabilize the hemiresected mandible during clenching. Three hemimandibulectomized subjects without surgical bony reconstruction were selected and custom-made Gothic-arch typed apparatus was fabricated. Mandibular movements during clenching were recorded with jaw movement tracking device with six degrees of freedom. The results were as follows:
1. The direction of the mandibular rotation around each coordinate axis in 3-dimensional space during clenching was constant in each subject, regardless of stylus position.
2. The most stable points on the hemimandibules during clenching did not necessarily correspond to the mid-portion of the remaining dentition of the mandible.
3. When referred to the maxillary arch, the point was lined up within the distal half of the second premolar and the mesial third of the first molar in mid-sagittal plane along the long axis of the remaining dentition.
4. Rotational axis during clenching existed on the horizontal plane.
5. It was assumed that the most stable point of the mandible in a hemimandibulectomy patient may be useful in interocclusal registration in clinical dental practice.View full abstractDownload PDF (3167K) -
Seiichiro Fujisawa, Masashi Yamamoto, Akane Yamamoto, Hitoshi Ikeuchi, ...1997 Volume 64 Issue 2 Pages 376-383
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSClinico-statistical observations were made on the outpatients visiting the Department of Initial Diagnosis and Emergency, Faculty of Dentistry Hospital, Tokyo Medical and Dental University in 1986, 1987, 1989 and 1990. The following findings were obtained according to sex, age group, and chief complaints of new outpatients. Approximately. 60% of the outpatients were female during the year examined. The number of outpatients tended to increase in March and to decrease during the winter. The largest number of new outpatients visiting the hospital was in the 20-24-year-old group in both males and females. In the female patients, the 50-54-year-old group had a relatively higher peak. The greatest chief complaint was tooth pain. Further, the chief complaint involving oral soft tissues was due to inflammation. The main disease diagnosed due to chief complaints was caries in the 20-29-year-old group, marginal periodontitis in the 50-59, pericoronitis of wisdom tooth in the 20-29, temporomandibular joint problem in the≤19 and masticatory disturbance in the 60≤-year-old groups.View full abstractDownload PDF (763K) -
[in Japanese], [in Japanese]1997 Volume 64 Issue 2 Pages 384
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (161K) -
[in Japanese]1997 Volume 64 Issue 2 Pages 385
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese], [in Japanese]1997 Volume 64 Issue 2 Pages 386
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (163K) -
[in Japanese], [in Japanese], [in Japanese]1997 Volume 64 Issue 2 Pages 387
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (127K) -
[in Japanese], [in Japanese]1997 Volume 64 Issue 2 Pages 388
Published: June 30, 1997
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (193K)
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