A5090887721- Endodontics and Root Canal Treatments
- Dental Radiography and Imaging
- Dental Research and COVID-19
- Occupational health in dentistry
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Engineering Technology and Methodologies
- Drilling and Well Engineering
- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Hydraulic Fracturing and Reservoir Analysis
- Engineering Diagnostics and Reliability
- Advanced Fiber Laser Technologies
- Optical Coherence Tomography Applications
- Medical and Biological Sciences
- Advanced Measurement and Metrology Techniques
- Dental Trauma and Treatments
- Geophysics and Sensor Technology
- Education and Learning Interventions
- Analytical chemistry methods development
- Laser-induced spectroscopy and plasma
- Dental materials and restorations
- Healthcare Education and Workforce Issues
Kyushu Dental University
2015-2021
Waseda University
2016
Ritsumeikan University
2008
Tohoku University
2001
Hitachi (Japan)
1990
To suppress lasing in higher order transverse modes and improve kink levels ridge-type 980-nm fiber pump semiconductor lasers, a novel ridge structure with optical antiguiding layers for horizontal is proposed, characteristics are theoretically analyzed. In the proposed structure, improved by suppressing spatial hole burning lowering gains modes, an increase thickness of layers, which located at both sides active region below mesa. Also, threshold current reduced due to concentration injected into
The purpose of this study is to evaluate the effect a bioactive glass-based root canal sealer, Nishika Canal Sealer BG (CS-BG), on incidence postoperative pain (PP) after obturation (RCO). Eleven dentists performed pulpectomy or infected treatments for 555 teeth. During RCO, CS-BG was used. After rate PP and factors affecting (pain during RCO immediately RCO) were analyzed. observed in eight teeth (1.5%), within 7 days there no with pain. In these PP, significant difference occurrence but...
With the development of dental instruments, such as microscopes and cone beam computed tomography, precision current diagnosis treatment has greatly improved. However, observation deep periodontal pockets, fractures near root apex, collaterals canals is difficult using these instruments. To solve problems, we developed two types micro-image sensors that can be used for canals. The first image sensor an external-irradiation probe uses external light source. This high resolution a wide field...
In dentistry, dentists perform many treatments with a few visually magnified information. About deep area of root canals, it commonly relies on exploration carried out the fingers dentist, because canal entrance is very small to be observed. clinical practice, intraoral camera and endoscopic systems are separate devices, there no sensors capture both pictures whole tooth those inside canal. Objective this research combine system facilitating use practice.We propose an based thin image fiber,...
With the development of dental instruments such as microscopes and techniques like cone-beam computed tomography (CBCT), precision treatment has greatly improved. However, observation fractures near apex collateral root canals using these remains difficult. In this study, we developed two types probes that employ external internal irradiation, respectively. The external-irradiation probe comprises an image fiber a gradient-index (GRIN) lens, each with diameter 500 µm. internal-irradiation...
The entrance of a tooth root canal is very small to the naked eye, and in most cases, dentists operate blindly perform treatment using an instrument. Particularly, observation fractures near apex collaterals canals difficult even latest dental To solve these problems, we attempted develop novel endoscope. In this study, developed micro image sensors that can be used for evaluation sensor visibility. Previous methods have only single line visibility; however, new method enables sectional...
This study aimed to examine the resin polymerization of a fiber post/core construction system and interface between root canal sealers, which are important for sealing. We used i-TFC Luminus post LC flow (i-TFC-L), GC Unifil Core EM (GCF), FiberKor Build-It FR (FKP) as core systems, Nishika Canal Sealer BG (CS-BG), Metaseal Soft (META), EN (CS-EN) sealers. The light transmission posts (n = 5), adhesion sealer 10) were evaluated. was significantly higher than that other posts. Without...
A laser-based emission-type diagnostic technique using laser-induced breakdown spectroscopy (LIBS) for the in vivo analysis of tooth enamel is described. The system aims to improve promptness laser dental treatment and accuracy identifying early caries from healthy teeth. Our research group has been developing LIBS various applications. In addition on system, a novel microdental endoscope observe fractures near root apex developed recent study. dentistry presented this paper first attempt...
Summary form only given. A frequency-shifted feedback laser is a frequency-chirped light source with high chirp linearity and rate. Several applications based on optical frequency domain reflectometry using such lasers have been investigated. These include ranging, temperature pressure sensing, measuring the dispersion of fibers. In these applications, there was problem dynamic range measurement system, which caused by destructive interference between output comb components. As solution, we...
In dentistry, endodontic treatment becomes necessary when dental caries progresses deep into the tooth and reaches pulp or periapical tissue. A large part of this is performed without direct observation root canals. Previously, we reported a prototype endoscope. study, attempted to develop novel image sensor for diagnosis that allows capturing an fine constructions inside Our fabricated probe contains fiber, GRIN lens, optical fibers as light sources. These materials are encased stainless...
The paper describes performance of a novel Nd:YAG laser marker equipped with liquid crystal device(LCD) mask instead the conventional metal stencil. is characterized by its capability changing patterns, such as alphanumeric characters, freely using microprocessor terminal within short period.