THE JOURNAL OF THE STOMATOLOGICAL SOCIETY,JAPAN

Review and Outlook on Sports Dentistry

Takashi Ohyama

1992 Volume 59 Issue 4 Pages 607-612
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.607

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Effects of Local Anesthetics on Healing Process of Extraction Wound in Rats with Reference to Effects of Epinephrine

Takako Wakamatsu

1992 Volume 59 Issue 4 Pages 613-630
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.613

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Effects of local anesthetics on the healing processes of the extraction wound were investigated in the rats.
The study was performed on 5 experimental groups: control group (GA), 2% lidocaine without a vasoconstrictor (LEO) and 2% lidocaine with epinephrine 1/20, 000 (LE2), 1/80, 000 (LE8) and 1/200, 000 (LE20) . Under general anesthesia (GA) the mandibular 2nd molars were extracted after the injection of each local anesthetic. The control group GA) had the teeth extracted without a local anesthetic. The wounds were examined histopathologically at timed sequence from 1 day to 14 days after the operation.
Postextraction wounds of all the groups healed uncomplicatedly and these 5 groups could be classified into 2 types of healing process: epinephrine-free group (GA and LEO) and epinephrine group (LE2, LE8 and LE20) . The 14-day postextraction sockets of the epinephrine-free group were filled with callus, whereas those of the epinephrine group had progressed to the final stage of bony healing unexpectedly. There was no difference in the healing process of each wound in the same group.
These results suggest that a local anesthetic without a vasoconstrictor do not modify the postextraction wound healing process, and epinephrine does not prolong but will promote the wound healing.

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Studies on Reduction of Repelling Force of Rare Earth Magnets

Concerning Tooth Intrusion

Asahi Kitsugi

1992 Volume 59 Issue 4 Pages 631-642
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.631

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The purpose of this investigation was to evaluate the sealing effect of the repelling force of the magnets with ferromagnetic stainless steel and also to examine the reduction pattern along with the change of the relative position of the magnets.
The Nd-Fe-B magnet as rare earth magnet, and SUSXM 27, YEP-3, SUS 416 as ferromagnetic stainless steel were used in this experiment.
The findings were as follows:
1. There was a little decrease of the repelling force of the magnets sealed with ferromagnetic stainless steel. On the other hand, no significant differences in the repelling force sealed with any kind of ferromagnetic stainless steel were found.
2. Direct contact of the repelling force of the φ4. 0×1.5 mm magnets sealed with SUSXM 27 of 0.2 mm in thickness was 242 gf. According to relative horizontal 1. 2 mm movement keeping direct contact, the vertical and horizontal components of the repelling force were of the same value.
3. The repelling force of the. φ10.0. 1.8 mm magnets sealed with SUSXM 27 of O. 2 mm in thickness was 815 gf. It showed more than 300 gf of vertical component of the repelling force when the magnets shifted to 3. 0 mm horizontally when in contact.
4. It is suggested that the repelling force of the Nd-Fe-B magnets will be clinically useful for the intrusion of molar teeth.

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Clinical, Radiological and Histopathological Studies of Squamous Cell Carcinoma of Lower Gingiva

Hiroshi Iwaki

1992 Volume 59 Issue 4 Pages 643-680
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.643

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In order to improve the treatment results of the lower gingival carcinoma, the treatment results were analysed based on the X-ray views, histopathological findings and mode of treatment. A series of 152 cases of primary lower gingival carcinomas treated at the First Department of Oral and Maxillofacial Surgery, Tokyo Medical and Dental University, during the 25 years between 1964 and 1988 was surveyed.
The lesions with the invasive type of bone resorption on the X-ray picture often had unclear tumor margin histopathologically and those of the pressure type had a smooth front, with a small number of exceptions.
The five-year cumulative survival rate was 76. 7% forthe pressure type, 64.6% for those without bone resorption, 53. 9% for the invasive type.
The deeper the resorption was, the higher the death rate was in the invasive type. Grade II of WHO classification and Grade 3 of the mode of invasion had the least recurrence rate and the least frequency of delayed cervical metastases. Grade 4D showed the highest recurrence rate and Grade 4C a high frequency of cervical metastases.
Five-year cumulative survival rate was 77. 8% for the cases treated by surgery, 65.6% for those by the combination of surgery and radiation, 57.1% for those by chemotherapy and 29. 5% for those by radiation.

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Mechanical Response of Temporomandibular Joint Induced by Occlusal Change

Naoki Shinozaki

1992 Volume 59 Issue 4 Pages 681-699
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.681

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The purpose of this research was to investigate the mechanical effects on the temporomandibular joint influenced by the occlusal variations: the inclination of the upper incisor and the change of occlusal contacted position on the lower occlusal surface. For this purpose a theoretical study and a model experiment were performed.
In the theoretical study, the Rigid Body Spring Model was applied to the temporomandibular joint for analyzation of the stress distribution and movement of the condyle head under the various conditions of the joint. Furthermore, the model experiment could be performed to confirm three-dimensionally the findings attained by the theoretical study.
The results were as follows:
1. In the phase of the decreasing upper incisor inclination excessively, the direction of the temporomandibular joint force was be rotated counterclockwise and the magnitude of the joint force was be increased.
2. The movement of the condyle head (distance and direction) and the stress distri bution of the disk were influenced by the various shapes of the joint and the mechanical properties of the surrounding soft tissues.

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[title in Japanese]

[in Japanese]

1992 Volume 59 Issue 4 Pages 700
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.700

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[title in Japanese]

[in Japanese], [in Japanese]

1992 Volume 59 Issue 4 Pages 701
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.701

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1992 Volume 59 Issue 4 Pages 702
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.702

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

1992 Volume 59 Issue 4 Pages 703
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.703

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[title in Japanese]

[in Japanese], [in Japanese]

1992 Volume 59 Issue 4 Pages 704
Published: 1992
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.5357/koubyou.59.704

JOURNAL FREE ACCESS

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