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The entrance of a tooth root canal is very small to the naked eye, and in most cases, dentists operate blindly to perform the treatment using an instrument. Particularly, the observation of fractures near the root apex and collaterals of root canals is difficult even using the latest dental instrument. To solve these problems, we attempted to develop a novel dental endoscope. In this study, we developed...
With the development of dental instruments such as dental microscopes and techniques like cone-beam computed tomography (CBCT), the precision of dental treatment has greatly improved. However, the observation of fractures near the apex collateral of root canals using these instruments remains difficult. In this study, we developed two types of probes that employ external and internal irradiation,...
To suppress lasing in higher order transverse modes and improve kink levels in ridge-type 980-nm fiber pump semiconductor lasers, a novel ridge structure with optical antiguiding layers for horizontal transverse modes is proposed, and lasing characteristics are theoretically analyzed. In the proposed ridge structure, kink levels are improved by suppressing spatial hole burning and lowering optical...
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