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Volume 38, Issue 11
Displaying 1-22 of 22 articles from this issue
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Longitudinal changes of morphology in medial edge epitheliumShoji INAGAKI1992 Volume 38 Issue 11 Pages 1587-1605
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSUltrastructural findings of secondary palatogenesis were investigated from days 14.0 to 17.5 in the fetuses of Wistar Imamichi rats by scanning electron microscopy.
The results are summarized as follows.
1. On day 15.0 when the palatal shelf began to bulge vertically, a distinct boundary was found between the lateral cobblestone shaped cells and the medial flattened cells along the ridge of the shelf.
2. On day 16.3 cobblestone shaped cells began to appear on the anterior third of the future nasal side of the shelf.
3. The boundary between the cobblestone shaped cells and the flattened cells translocated gradually from the future oral to the future nasal surface of the shelf during the reorientation of the palatal shelf. We are of the opinion that the epithelial movement interacts with proliferation of the underlining connective tissue. We assume that a gradual intrinsic force plays a very important role in the reorientation of the palatal shelves.
4. On day 16.6 just before the middle portion of the shelf came into contact all flattened cells on the nasal side of the shelf were replaced by cobblestone shaped cells. The cobblestone shaped cells began to degenerate into the form of cauliflower on the tip of the medial edge. This degeneration advanced on not only the oral side but also the nasal side of the shelf.
5. On day 16.6 the convex raised cells, which were smaller than the cobblestone shaped cells, were newly formed on the corner between the cobblestone shaped cells and flattened cells on the nasal base of the shelf. Many cilia and microvilli covered the convex raised cells.View full abstractDownload PDF (25124K) -
Masahiro KUMAGAI1992 Volume 38 Issue 11 Pages 1606-1616
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSTo investigate the feasibility of clinically using bone morphogenetic protein (BMP), BMP was implanted into artificial alveolar clefts of adult mongrel dogs. The crude BMP was obtained from bovine bone matrix. Bovine atherocollagen was also implanted into the clefts as control. The dogs were periodically examined by radiography. Four months after implantation, plaster study models of the maxillary arch were taken. The dogs were then killed and the specimens were examined histologically and radiographically. Moiretopography of the study models was analyzed to examine improvement in the alveolar defect. The results demonstrated that bone bridge formation was radiographically evident in the implanted site 3 months after implantation. At 4 months after implantation, new bone formation rimmed by osteoblasts was microscopically observed among the mature bone. Study model analysis by moiretopography suggested that the form of the alveolar ridges receiving BMP implants was significantly improved. These results indicate that the implantation of BMP is a useful procedure for the treatment of alveolar clefts.View full abstractDownload PDF (8744K) -
Hideyuki SHIBA, Fumihiro OHSAKA, Yutaka OKADA, Tanekuni NOMOTO, Souich ...1992 Volume 38 Issue 11 Pages 1617-1622
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSSkin abrasion wounds of the guinea pig back were irradiated by a CO2 laser beam (4.5 J/cm2) and the collagen and DNA content and type I and III collagenase activity in the wound tissue were determined to investigate biochemical effects on the metabolism of connective tissue components after low power CO2 laser irradiation.
The results of this experiment yielded three conclusions:
1. The hydroxyproline content of irradiated skin 14 days after inflicting the skin abrasion was higher than that of non-irradiated skin.
2. The enzyme activities of type I and II collagenase in irradiated skin were higher than those in non-irradiated skin 5 and 7 days after making the skin abrasion.
3. As there was no apparent increase in tissue temperature at the irradiation conditions of this experiment (4.5 J/cm2), the thermal and photochemical effects of low power CO2 laser irradiation (10.6μm) were ruled out. An other, new, biochemical effect was most liked involved in the observed phenomena.View full abstractDownload PDF (753K) -
Yoshiro MATSUI1992 Volume 38 Issue 11 Pages 1623-1635
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSThe purpose of this study was to evaluate the application of hydroxylapatite (HA) implants in 60Co irradiated bone. Fifty-two adult male rabbits were used for the experiment. HA was implanted in the mandible 3 months (3 M group), 6 months (6 M group) and 12 months (12 M group) after application of 15 Gy of irradiation from a 60Co source. Nonirradiated animals served as controls. The animals were sacrificed 7, 14, 30, 60 and 90 days after HA implantation. Healing processes were examined by contact microradiography, fluorescent labeling with bone markers (tetracycline and calcein), and histologically with HE stain.
The following results were obstained:
1. HA-bone fusion occurred on the 7th day in the control, 6 M and 12 M groups, and on the 30th day in the 3 M group.
2. Bone fusion with almost the entire HA surface occurred on the 30th day in the controls, 60th day in the 6 M and 12 M groups, and 90th day in the 3 M group.
3. Trabecular bone around the implant decreased from the 30th day in the control, 6 M and 12 M groups, and on the 60th day in the 3 M group.
4. These results indicate that the application of hydroxylapatite dental implants to irradiated bone should be performed as late as possible after tradiation. The healing period after implantation needs to be as long as possible. In addition, cortical bone should contribute more to the retention of HA than trabecular bone because a long healing period causes a decrease in travecular bone around the implant.View full abstractDownload PDF (11633K) -
Katsuaki MISHIMA, Toshio SUGAHARA, Yoshihide MORI, Katsuhiro MINAMI, Y ...1992 Volume 38 Issue 11 Pages 1636-1644
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSDetermination of facial landmarks is an essential process in facial measurement. In this investigation, this process, usually performed by hand, was accomplished automatically using a computer program in which landmarks were re-defined in a form allowing for computer analysis.
Further more, the stability and reliability of this method were compared with the manual technique. Data for a three-dimensional wire frame model, obtained from facial plaster models by 1 mm mesh automatic measuring by a contact-type, high accuracy, three dimensional measuring system, were sent to a personal computer.
The landmarks were then determined by a computer program which was written in “BASIC”, The results demonstrated that the landmarks can be obtained automatically except for a few special conditions. The standard deviations of almost all landmarks obtained by this automatic method were within 0.3-0.5 mm. In contrast, the corresponding values obtained manually were within 2-3 mm. Consequently, the usefulness of this method was demonstrated.View full abstractDownload PDF (4251K) -
Katsuaki MISHIMA, Toshio SUGAHARA, Yoshihide MORI, Katsuhiro MINAMI, Y ...1992 Volume 38 Issue 11 Pages 1645-1651
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSThere are two accurate methods to measure facial configurations, especially the external nose, as three dimensional objects. One is laser-scanning which can immediately measure faces directly and without contact. The other method, which we usually use, measures plaster models, obtained from facial impressions made with dental impression materials, by means of a contact-type, high accuracy three dimensional coordinate measuring system (contact measuring system).
This study was designed to assess the accuracy and stability of these two methods, an issue previously paid little attention. Four 25-year-old men without facial deformity were examined with these systems. Multiple plaster models were taken from each subject to investigate model stability. All data were integrated into three dimensional models, shown as computer graphics, and compared by the “best fit program, ” which can handle and superimpose the two sets of curved surface data to derive minimum differences in normal vector direction at every site of the surface.
The two sets of curved surface data obtained from the same plaster model by each system were almost identical except for areas of the alar groove. In data derived from the laser-scanning system, more than 1.0 mm of distortion was noted around areas of overhang. Facial and plaster model data obtained by the laser-scanning system showed very good fit, with deviation between data being 0.2-0.3 mm.
These results show the high accuracy of facial plaster models. The stability of plaster models was also examined with a contact measuring system and deviation between data was 0.1-0.2 mm. In conclusion, although the two systems employed in this study have different characteristics, both are highly accurate and useful for clinical measurement.View full abstractDownload PDF (7139K) -
Indications and timing fbr surgeryKen-ichi NOTANI, Hiroshi YAMAZAKI, Hiroshi FUKUDA1992 Volume 38 Issue 11 Pages 1652-1658
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSSixty cases of osteoradionecrosis of the mandible were retrospectively studied.
The primary sites of the tumor were 37 tongue, 12 floor of mouth, and 11 oropharynx. The majority of cases in the tongue received radiotherapy combining 60Co external irradiation with 137Cs interstitial irradiation. Most cases of the floor of the mouth and oropharynx received 60Co external irradiation.
The severity of disease was classified as Stage I, II A, II B, III A and II B. There was just 1 case in Stage I which had only bone exposure. In Stage II A there were 19 cases which were cured by sequestration. In Stage III B, 5 cases did not show signs of sequestration and were not cured. In Stage III A, there were 32 cases which healed in spite of pathological fractures and skin fitulae. In Stage III B, there were 3 cases with fractures and skin fistulae in which the disease was not resolved or progressed. Both Stage II and Stage III cases were found in the tongue group and mostly Stage III was noted in the floor of the mouth and oropharynx groups.
As for the initial time of bone exposure, Stage I was 13.0 months, Stage II 14.3 months and Stage III was 22.0 month on the average. All 6 cases showing bone exposure after 48 months were Stage III. Thus the time of bone exposure tended to be later in advanced disease.
Stage I and II received conservative therapy but Stage III was treated surgically. Stage III cases in the tongue group were treated conservatively and the prognosis was relatively good. Stage III cases in the floor of mouth and oropharynx groups showed a poor prognosis when treated conservatively.
The average duration of discomfort was 35 months in all cases. It was found that average duration of discomfort was longer in Stage III cases in the floor of mouth and oropharynx groups than in Stage II cases of the tongue group.View full abstractDownload PDF (1066K) -
Etsurou KAJIMURA, Yasuo OKUDA, Isao FURUTA, Sirou HOSOKAWA1992 Volume 38 Issue 11 Pages 1659-1660
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Hideo IMAMURA, Eiro KUBOTA, Takesi KATSUKI, Masaaki GOTO, Hiroyuki KUR ...1992 Volume 38 Issue 11 Pages 1661-1662
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Kenji KURASHINA, Akira OGISO, Hiroshi KURITA, Toshikazu MINEMURA, Koh- ...1992 Volume 38 Issue 11 Pages 1663-1664
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Masakazu HARADA, Nobuo MORITA, Takeshi WADA, Kazuyuki MIYATA, Shoji YU ...1992 Volume 38 Issue 11 Pages 1665-1666
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Kenichi SHIONOYA, Sadao OKABE, Kiyohiro MATSUKI, Takeshi ENDO, Toshiyu ...1992 Volume 38 Issue 11 Pages 1667-1668
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Akihiro KANEKAWA, Shunsuke UEMURA, Toshiaki KAMEI1992 Volume 38 Issue 11 Pages 1669-1670
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Masamichi IDA, Yoshikazu HAYATSU, Kasuke NAKASHIMA, Fumihiko SHINOZAKI1992 Volume 38 Issue 11 Pages 1671-1672
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Toshiyuki OSHITANI, Gaku YAMAMOTO, Yoshinori YAMAGUCHI, Mitsunobu MORI ...1992 Volume 38 Issue 11 Pages 1673-1674
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Angle fracture cases of the mandibleJunichiro NUKATA, Masahiro MICHIZAWA, Hiromi FUJISHIRO, Tadayuki INATA ...1992 Volume 38 Issue 11 Pages 1675-1676
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Akira TATEISHI1992 Volume 38 Issue 11 Pages 1677-1678
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Takashi MIMA, Masahiro URADE, Takashi UEMATSU, Yasuo FUKUDA, Tokuzo MA ...1992 Volume 38 Issue 11 Pages 1679-1680
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Takamasa SHIROZU, You MUKAI, Susumu IIDA, Noriaki IKEDA, Yoichiro KAME ...1992 Volume 38 Issue 11 Pages 1681-1682
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Norihiro MIYOSHI, Katsumi NISHIJIMA, Nobuyoshi MIZUKAWA, Takayuki MORI1992 Volume 38 Issue 11 Pages 1683-1684
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Kazumasa SUGIHARA, Makoto FUJISAKI, Kiyomi KAWASHIMA, Haruyuki IMAMURA ...1992 Volume 38 Issue 11 Pages 1685-1686
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
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Mayumi YAMAGISHI, Yutaka KITAMURA, Osamu IWAMOTO, Takahiro CHINO, Osam ...1992 Volume 38 Issue 11 Pages 1687-1688
Published: November 20, 1992
Released on J-STAGE: July 25, 2011
JOURNAL FREE ACCESSDownload PDF (3364K)
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