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Your search keyword '"Komazawa, Daigo"' showing total 29 results
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29 results on '"Komazawa, Daigo"'

21. Safety and short-term outcomes of basic fibroblast growth factor injection for sulcus vocalis.

Author

Takeharu, Kanazawa, Kurakami, Kazuya, Konomi, Ujimoto, Komazawa, Daigo, Misawa, Kiyoshi, Imayoshi, Shoichiro, and Watanabe, Yusuke

Subjects
AERODYNAMICS, HOARSENESS, INJECTIONS, ACADEMIC medical centers, HUMAN voice, VOCAL cord diseases, TREATMENT effectiveness, PATIENT safety
Abstract

Background: Sulcus vocalis (SV) is characterized by the appearance of a groove and fibrotic changes in the vocal fold mucosa and an often irrevocable loss of tissue viscoelasticity and vibratory potential. Although several surgical approaches have been proposed, none are ideal treatments. Basic fibroblast growth factor (bFGF) may stimulate fibroblasts in the superficial layer of the lamina propria (SLP) and increase the vibration of vocal fold mucosa. Aims/objectives: The aim of this study was to evaluate the safety and short-term outcomes of bFGF injection for SV. Materials and methods: This study was registered with the University Hospital Medical Information Network-Clinical Trials Registry (UMIN000019347). Twelve cases of pathological SV were treated using a method involving bFGF injection. The treatment regimen involved the injection of 50 µg of bFGF into the SLP. More than 3 months after the injection, aerodynamic and acoustic outcomes were examined. Results: No adverse events were recorded. Significant improvements were observed in the maximum phonation time (MPT) and Voice Handicap Index (VHI) after treatment. Multiple injections achieved additional effects. Conclusions and significance: bFGF injection may be a safe and suitable office-based surgery for the alleviation of hoarseness caused by SV based on this preliminary short-term study. [ABSTRACT FROM AUTHOR]

Published
2018
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28. Ultrasonography of the cricoarytenoid joint and its movements.

Author

Kunieda C, Mori T, Konomi U, Matsushima K, Komazawa D, and Kanazawa T

Abstract

Objective: Ultrasound provides real-time anatomical information and motion. We used ultrasound to image the cricoarytenoid joint and its rotating, rocking, and gliding movements., Methods: Between March and October 2023, 20 patients (10 males and 10 females) who visited our hospital underwent laryngeal ultrasonography. The joint cavity was delineated in four patients (20 %, two males and two females). Conversely, the other patients did not detect it because of acoustic shadows on ultrasonography. We also performed ultrasonography on five volunteers (three males and two females), but only two of them (two females) showed imaging of the joint cavity. Herein, we report the case of a female volunteer in her 30 s who had the best delineation of joint movements., Results: Joint movements were three-dimensional, whereas ultrasound images were two-dimensional. However, combined with scanning techniques, characteristic joint movements were successfully imaged using ultrasound. Initially, we performed a trans-thyroid cartilage transversal procedure to visualize the muscular process of the arytenoid cartilage and rotational movement. Subsequently, the probe was rotated to an oblique position, and the articular cavity of the cricoarytenoid joint was visualized. We then observed the rocking and gliding movements. In Addition, we demonstrated a seamless transition from gliding to rocking. Finally, we observed that the arytenoid cartilage was pulled toward the posterior cricoarytenoid muscle (PCA) during sniffing. The PCA is the only muscle opening the vocal cords, so the arytenoid cartilage shifts toward the PCA and tilts outward from the larynx., Conclusion: The presented probe scanning techniques and specific joint movements may help identify notable conditions such as arthritis or joint dislocation., Competing Interests: Declaration of competing interest The authors declare that they have no conflict of interest., (Copyright © 2024. Published by Elsevier B.V.)

Published
2024
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29. Evaluation of mechanical properties of esthetic brackets.

Author

Matsui S, Umezaki E, Komazawa D, Otsuka Y, and Suda N

Abstract

Plastic brackets, as well as ceramic brackets, are used in various cases since they have excellent esthetics. However, their mechanical properties remain uncertain. The purpose of this study was to determine how deformation and stress distribution in esthetic brackets differ among materials under the same wire load. Using the digital image correlation method, we discovered the following: (1) the strain of the wings of plastic brackets is within 0.2% and that of ceramic and metal brackets is negligible, (2) polycarbonate brackets having a stainless steel slot show significantly smaller displacement than other plastic brackets, and (3) there is a significant difference between plastic brackets and ceramic and stainless steel brackets in terms of the displacement of the bracket wing.

Published
2015
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