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23 results on '"Yohichiroh Soh"'

4. Study of Root Canal Filling after the Use of Ultrasonic Vibration for Root Canal Preparation and Irrigation : First Report : Evaluation of Lateral Condensation Method and Vertical Condensation Method

Author

Masatoshi Hitaka, Kohzoh Kubota, Hakubu Yamamoto, Yohichiroh Soh, Nobuyuki Minami, Takashi Hayashikawa, and Junroh Tahara

Subjects
Irrigation, medicine.anatomical_structure, Materials science, business.industry, Root canal, Ultrasonic vibration, Condensation, medicine, Dentistry, Report evaluation, Composite material, business, Lateral condensation
Published
1989
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8. Study of Root Canal Filling after the Use of Ultrasonic Vibration for Root Canal Preparation and Irrigation : The Second Report : Evaluation of Obtura and Thermomechanical Condensation Method

Author

Junroh Tahara, Yohichiroh Soh, Takashi Hayashikawa, Kohzoh Kubota, Masatoshi Hitaka, Hakubu Yamamoto, and Nobuyuki Minami

Subjects
Irrigation, medicine.anatomical_structure, Materials science, Root canal, Ultrasonic vibration, Condensation, medicine, Composite material, Report evaluation
Published
1989
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9. Scanning Electron Microscopic Study of Root Canal Filling after the Use of Ultrasonic Vibration for Root Canal Irrigation : The Second Report : Evaluation of Thermomechanical Condensation Method and Injection-molded Thermoplasticized Method

Author

Masatoshi Hitaka, Nobuyuki Minami, Tomoko Ohsumi, Hakubu Yamamoto, Junroh Tahara, Kayoko Kuroki, and Yohichiroh Soh

Subjects
Irrigation, Materials science, medicine.anatomical_structure, business.industry, Scanning electron microscope, Root canal, Ultrasonic vibration, Condensation, medicine, Dentistry, Composite material, Report evaluation, business
Published
1988
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16. Scanning Electron Microscope Observations on Influence of Ultrasonic Vibration on Root Canal Cleansing Effect : Comparison between the Middle and the Apical Areas

Author

Tomoko Ohsumi, Masatoshi Hitaka, Kohzoh Kubota, Hakubu Yamamoto, Yohichiroh Soh, Kayoko Kuroki, Junroh Tahara, and Kazuo Yasumoto

Subjects
medicine.anatomical_structure, Materials science, Scanning electron microscope, Root canal, Ultrasonic vibration, medicine, Biomedical engineering
Published
1987
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23. [Experimental study of periodontal tissue regeneration using biodegradable membranes]

Author

Yohichiroh Soh, Takao Okada, Tohru Naitoh, Reiko Ochi, Yuhzoh Tuge, Takashi Hayashikawa, Masatoshi Hitaka, Kohzoh Kubota, and Hakubu Yamamoto

Subjects
Dental Cementum, Bone Regeneration, Chemistry, Periodontal Ligament, Regeneration (biology), Epithelial Attachment, Membranes, Artificial, medicine.disease, Cementogenesis, Resorption, PLGA, chemistry.chemical_compound, Membrane, medicine.anatomical_structure, Dogs, Mole, medicine, Ankylosis, Animals, Cementum, Biomedical engineering
Abstract

This study was designed to investigate the effect on new attachment formation using a biodegradable membrane as a barrier to the regeneration of periodontal tissue. One-wall wide periodontal osseous defects with exposed root surfaces were prepared in three adult mongrel dogs. After surgical debridement of the periodontal defects, 3 types of biodegradable membranes, [Poly(L-lactic acid); (P-L-LA)] membrane, [Poly(lactic acid-co-glycolic acid); (PLGA)] (81: 19 mole%) membrane and PLGA (50: 50 mole%) membrane, were arranged to cover the denuded root surfaces. Specimen blocks were removed 8 weeks postoperatively for histological evaluation of their effect on the regeneration of periodontal tissue. The results were as follows: 1. Gingival regions containing P-L-LA or PLGA (81: 19 mole%) membranes showed delayed wound healing macroscopically. 2. Almost all P-L-LA membranes were present in the experimental sites failing to be resorbed during the 8-week experimental period. PLGA (81: 19 mole%) membranes were also present but showed with some degree of resorption and fragility, while PLGA (50: 50 mole%) membranes were completely resorbed. 3. This showed that the membranes used in this experiment are possible barriers to the generation of new attachment. It is important to make sure keeping the membrane. 4. There was no relationship between osteogenesis and cementogenesis. It seems that osteogenesis was depressed by membrane shrinkage and the gingival pressure which limited "the regenerative space of bone." 5. Moderate resorption was observed on the root surface, and new cementum was formed at the resorbed surface. 6. Ankylosis was observed between the new cementum and bone at the experimental sites. Newly formed cementum was seen on coronal sections of this area.

Published
1989

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