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Volume 65 (1998)
- Issue 4 Pages 369-
- Issue 3 Pages 291-
- Issue 2 Pages 155-
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Volume 65, Issue 3
Displaying 1-15 of 15 articles from this issue
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Hidehiko Sano1998 Volume 65 Issue 3 Pages 291-296
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
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Makoto Shiota, Yuichi Shigeoka, Osamu Iritani1998 Volume 65 Issue 3 Pages 297-301
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe object of this study was to discuss the occlusal force distribution on the dental arch before and after wearing implant-supported prostheses. The occlusal force was measured on four patients missing uni-lateral molars restored with 14 dental implants. The occlusal force distribution was represented as the occlusal force bearing rate (BR.) which is the percentage of occlusal force on each portion to the total occlusal force. B.R. of the implant portion, of the non implant side molar portion and of the anterior portion were calculated on four patients. B.R. of the premolar implant portion and of the molar implant portion were calculated on two patients. The pressure sensitive sheets and the image scanner (Dental Prescale 50H type R and Occluzer FPD 703, Fuji Photo Film Co.) were used in this study. The results were as follows
1. The corresponding occlusal force was also born with the implant portion. Therefore, the total occlusal force increased, and the occlusal force distribution was extended to the same degree as the natural dentition after wearing the implantsupported prostheses.
2. The occlusal force and B.R. on the molar implant portion were considerably large regardless of wearing premolar implants.
3. The occlusal force and B.R. on the most distal implant in any molar portion were almost constant.
These results suggested that the implant restoration should be useful for recovering occlusal functions, and that the most distal implant on the dental arch should have the sufficient bearing potential.View full abstractDownload PDF (748K) -
Yasushi Hirata1998 Volume 65 Issue 3 Pages 302-312
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSAs to postoperative scar formation of maxillofacial lesions, a number of authers have reported on the clinical classification and light or electron microscopic observations of hypertrophic scars. However, there has been no quantitative study to evaluate the surface of the postoperative scar and its relevance to changes in histopathology. The purpose of this study was to assess postoperative scar formation on patients with cleft lip quantitatively by using a non-contact 3-D measurement system and to compare the findings with the histopathologic changes.
Thirty-six specimens were obtained from patients when they underwent corrective surgery of the lip.
The depth of the scar was measured by using a non-contact 3-D measurement system. The results were compared with morphological findings of fibroblasts and collagen fibers of the scar tissues under a light microscope.
The results were following as follows:
1. The depth of the CLP group was 181.4±78.4μm, significantly higher than 55.7±24.8μm of the nonclef t group (p<0.05) .
2. Histologically, the scar, which formed a diffuse mass of irregularly arranged thick collagen fibers, showed a higher value in the depth of the scar than the one which formed a regular pattern.
3. The scar with mature spindle fibroblasts showed a higher value in the depth of the scar than the one with immature round fibroblasts.
In conclusion, it was suggested that a non-contact 3-D measurement system is useful for measuring the depth of the scar surface, and the histologic changes of the scar influence the depth.View full abstractDownload PDF (12639K) -
Ichiro Sakamoto, Tetsuya Yoda, Jinkyo Sakurai, Hiroyasu Tsukahara, Shi ...1998 Volume 65 Issue 3 Pages 313-318
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIn order to clarify the clinical significance of morphological bone changes of the mandibular Condyle in temporomandibular disorders, the relationship between radiographic bone changes and aging was clinically studied. The subjects of the study were 1, 120 patients (812 females and 308 males) . The average age was 33 years ± 15 years (from 10 to 81 years of age) . The 1, 120 patients were divided into six age brackets (10 to 19 years, 20 to 29 years, 30 to 39 yeras, 40 to 49 years, 50 to 59 years, 60 to 81 years) . According to radiograms taken by lateral oblique transcranial projection, orbitcondyle projection and orthopantomography, the morphological bone changes were classified into seven groups, erosion, osteophyte, eburnation, flattening, deformity, concavity and sclerosis.
The results were as follows.
1. The incidence of the patients with radiographic bone changes of the mandibular condyle increased with aging and showed significantly different age distribution from that without bone changes (Mann-Whitney U test : p<0.01) .
2. The incidence of erosion did not increase with aging and showed significantly different age distribution from osteophyte or eburnation (Mann-Whitney U test : p<0.01, 0.05) . The incidence of flattening also did not increase with aging and showed significantly different age distribution from osteophyte, eburnation or deformity (Mann Whitney U test : p < 0.01, 0.05, 0.05) .View full abstractDownload PDF (867K) -
Chie Shimizu, Shiro Mataki, Norimasa Kurosaki, Yoko Kawaguchi, Kayo Te ...1998 Volume 65 Issue 3 Pages 319-322
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSFaculty of Dentistry, Tokyo Medical and Dental University first introduced New Curriculum of Behavioral Dentistry in Japan. This curriculum has been established in consideration of the current social environments and dental clinical practice in our country, in addition to reference to Curriculum Guidelines in the USA.
When students' impressions and assessments on the courses were researched and analyzed, the majority were found to be satisfied with this curriculum although several problems to be solved were also presented at the same time, such as timing of derivering lectures.View full abstractDownload PDF (512K) -
Tetsuo Suzuki1998 Volume 65 Issue 3 Pages 323-333
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSSkin color of free flaps can represent their vascular conditions after reconstructive surgery. Thus far, however, surgeons have subjectively inspected flap color changes. More precise and objective measurement is necessary for early detection of vascular insufficiency. In order to evaluate color changes of flaps we used a portable non-contact type colorimeter with a L*a*b* color space (L* is brightness and a*, b* are chromaticness) recommended by the CIE (Commission Internationale d'Eclairage) .
Initially, we successfully performed objective evaluation of flap color changes in rats with or without a tied femoral artery or vein. Vein failure showed a decrease in a* and b* soon after surgery, while the artery failure appeared as b* and L* after 12 and 24 hours, respectively.
Then, the color differences between sites of clinical free flaps were examined and considered to be relatively negligible against the time-dependent changes using Δa*, Δb*, ΔL*, which represents the difference in color of an objective point from a control point. Next, we demonstrated that the color of abdominal skin did not significantly differ from that of forearm skin using Δa*, Δb*, ΔL*.
The clinical free flaps were measured with these parameters pre-and post-operatively and their normal course of color changes was revealed. The findings showed that a* changed with characteristic ups and downs before and after elevation due to congestion.View full abstractDownload PDF (1653K) -
Shiro Mataki, Yoko Kawaguchi, Kayo Teraoka, Norio Shimura, Chie Shimiz ...1998 Volume 65 Issue 3 Pages 334-338
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this paper is to present an outline of student's practice of interviewing simulated patients at behavioral science in dentistry. This practice was initiated as part of a newly introduced behavioral science course at our school of dentistry, to enable students to acquire communication skills, comprehensive understanding, and a proper attitude vis-à-vis patients. Students as well as instructors involved in the practice evaluated it as highly relevant for clinical education. It is concluded that the development of such practices in dental education is a prerequisite for training students to dentists oriented toward patientcentered dental practice.View full abstractDownload PDF (2476K) -
Aki Sodeyama, Tatsuya Shinogaya, Makoto Matsumoto1998 Volume 65 Issue 3 Pages 339-343
Published: September 30, 1998
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSWe have reported that the analysis of the maximal bite force distribution over dentition was available for objective evaluation of prosthodontic treatment. The purpose of this study was to investigate the reproducibility of occlusal force disrtribution in maximal voluntary clenching. The maximal bite forces of 10 normal subjects with complete dentition were measured at close to intercuspation using Dental Prescale System. The measurements were performed two times with an interval of 3 years. The differences of the distributed occlusal force and the location of occlusal load center, i. e., the center of balance of distributed occlusal force, between 1st and 2nd measurement were evaluated by Mann-Whitney signed rank test (p<0.01) . The coefficient of variance was calculated from the results of two measurements in order to assess the measurement error.
The statistical significant differences were not found in all measurement protocol and the coefficient of variance of the location of occlusal load center showed a remarkably small value (4.0%) . The mean of absolute differences in the location of occlusal load center between two measurements were almost 4.0 mm anteroposteriorly and right-left.
These results suggested that the maximal bite force measurement and the analysis of occlusal force distribution using Dental Prescale System were useful for the longitudinal evaluation of masticatory function and prosthodontic treatment. The analysis of occlusal load center was shown to be the most reliable method for evaluation. The reliable range for the reproducibility of occlusal load center was also shown.View full abstractDownload PDF (3044K) -
Ken-ichi Tonami, Tohru Ohtani, Naohiko Iwasaki, Kazuo Motomura, Hideo ...1998 Volume 65 Issue 3 Pages 344-348
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate the mechanical properties of titanium casting obtained using short-time cast procedure. A commercial phosphate-bonded investment for titanium casting were used. And dumbbell-shaped specimens with φ 2 mm × 14 mm parallel portion were cast according to manufacture instruction and by way of three different short-time cast procedures. Then, micro vickers hardness test and tensile test were performed with these specimens.
In the hardness test, the micro vickers hardness of 50-250μm deep location from specimen surface was ranged from 192.8 to 259.0 Hv; there were significant difference among both the location factor and the casting procedure factor by the two-way ANOVA (p<0.05) .
In the tensile test, tensile strength, yield strength, elastic modulus and elongation were obtained; these tensile properties of short time cast procedures were not significantly different from those of manufacture instruction.
These results indicated that the short-time cast procedure for titanium casting was available in the point of mechanical properties. It was, however, not obvious that how the short-time cast procedures effected the dimensional accuracy of titanium casting. Therefore, further investigation was needed for the practical usage of this method.View full abstractDownload PDF (3081K) -
[in Japanese], [in Japanese]1998 Volume 65 Issue 3 Pages 349
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]1998 Volume 65 Issue 3 Pages 350
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]1998 Volume 65 Issue 3 Pages 351
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1998 Volume 65 Issue 3 Pages 352
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]1998 Volume 65 Issue 3 Pages 353
Published: September 30, 1998
Released on J-STAGE: October 08, 2010
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1998 Volume 65 Issue 3 Pages 366
Published: 1998
Released on J-STAGE: October 08, 2010
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