Search Results 1-20 of 222

  • A Nonsurgical Approach to a C-shaped Mandibular Second Molar with Chronic Apical Periodontitis: A Case Report  [in Japanese]

    Yuzo KAWANISHI , Hazuki MAEZONO , Mikako HAYASHI

    … <p> Purpose: A C-shaped root canal has a complex configuration and sources of infection remaining in it make nonsurgical root canal treatment difficult. … Dental radiography and CBCT of the mandibular left second molar revealed a radiolucent area at the apex, poor root canal filling and separated file-like radiopacity in the root canal. … Also, a C-shaped root canal was curved distobuccally at the apex area. …

    The Japanese Journal of Conservative Dentistry 63(5), 461-466, 2020

    J-STAGE 

  • Evaluation of Root Canal Wall Displacement and Working Time in Simulated Curved Root Canals Using Various Reciproc Files  [in Japanese]

    Miki SEKIYA , Munehiro MAEDA , Taro NISHIDA , Masaru IGARASHI

    … <p> Purpose: To compare the shaping ability of the combination of the R-PILOT (RP) Reciproc glide path file and the conventional Reciproc (RC) or the more flexible Reciproc Blue (RC Blue) by investigating root canal wall displacement on the inner and outer sides of the curvature and the working time.</p><p> Methods: The curvatures of J-shaped curved root canal model blocks were scanned as image files. …

    The Japanese Journal of Conservative Dentistry 63(5), 405-413, 2020

    J-STAGE 

  • A report of a mandibular first premolar with two root canals  [in Japanese]

    Toshihiko OBARA

    … <p><b>Abstract : </b>When treating a mandibular first premolar, an important point to consider is the potential existence of two root canals. … Double root canals appear at a rate of about 20%. … Clinicians should take care to avoid ledge formation due to a fracture caused by the tip of the file biting into a severely curved root canal or excessive rotational torque. … Ledge formation can prevent cleaning to the root apex. …

    The Journal of Japan Endodontic Association 41(3), 198-204, 2020

    J-STAGE 

  • Consideration of Bending Stress at Fillet in Curved Tooth of Small Size and High Strength Spiral Bevel Gear Fabricated by Five Axis Controlled Machining Center  [in Japanese]

    SAITO Masahiro , TOYOTA Shinya , HIROGAKI Toshiki , AOYAMA Eiichi

    … We investigate the influence of the rib width and height on the maximum stress at the curved tooth root and rib joint part. …

    The Proceedings of Conference of Kansai Branch 2020.95(0), 01_106, 2020

    J-STAGE 

  • Comparative Evaluation of the Shaping Ability of Nickel-titanium Rotary and Stainless Steel Hand Root Canal Instrumentation Performed by Undergraduate Students  [in Japanese]

    Keiichiro MAKI , Arata EBIHARA , Taro NAKATSUKASA , Shunsuke KIMURA , Takashi OKIJI

    … <p> Purpose: This study aimed to evaluate the canal-centering ability, working time and frequency of procedural errors of nickel-titanium (NiTi) rotary and hand stainless-steel root canal instrumentation performed by undergraduate students who were inexperienced in NiTi rotary instrumentation.</p><p> Methods: Fifty-nine undergraduate students with no experience of NiTi rotary instrumentation participated in this study. …

    The Japanese Journal of Conservative Dentistry 63(4), 305-311, 2020

    J-STAGE 

  • A study on the shaping ability of root canal preparation using RECIPROC<sup>®</sup> blue  [in Japanese]

    Kyoko ARAI , Hanae MINATO , Kota SHIMIZU , Kayoko KITAJIMA , Takashi YOKOSUKA , Tomonori SATOH , Koichiro MATSUDA , Masaru IGARASHI

    … <p><b>Abstract : </b>Purpose : The purpose of this study was to compare the total preparation times, the pushing and pulling forces and the amount of canal transportation after preparation of resin curved root canal models using the following two kinds of files : RECIPROC<sup>®</sup> … (RE : conventional file).</p><p> Methods : Resin models that had curved root canals of 30 degrees were used (n=8, each). …

    The Journal of Japan Endodontic Association 41(2), 103-109, 2020

    J-STAGE  Ichushi Web 

  • Comparison of Obturation Ratios between the Thermafil Obturator and NT Condenser with Obturation Gutta NT Using Micro-CT Analysis  [in Japanese]

    Kohei SHIMIZU , Hiroshi KOBAYASHI , Yoriyuki HIRANO , Bunnai OGISO , Takuya YASUKAWA , Keisuke HATORI , Yusuke SUZUKI , Osamu TAKEICHI , Makoto HAYASHI , Hisashi SUGURO , Takeshi NAKAMURA , Takahito TAMURA

    … <p> Purpose: To compare the obturation ratio in curved root canals filled with a Thermafil obturator (Dentsply Sirona, Tokyo, Japan) or NT condenser (SybronEndo, Orange, CA, USA) with Obturation Gutta NT (Toyo, Tokyo, Japan) using micro-CT analysis.</p><p> Methods: Twelve curved root canal models in a Thermafil training block were prepared using the Protaper system, from size S1 to F2. …

    The Japanese Journal of Conservative Dentistry 63(2), 181-187, 2020

    J-STAGE  Ichushi Web 

  • How to enlarge and then obturate curved root canals successfully  [in Japanese]

    北村 和夫

    日本歯科医師会雑誌 71(12), 1023-1032, 2019-03

    Ichushi Web 

  • Investigation on Effective Education Methods for Preparing Curved-root Canal with FKG Race:Part 2. Proficiency of J- and S-shaped Root Canal Preparation by Using Nickel-titanium File FKG Race  [in Japanese]

    Jun OHSHIMA , Katsuaki NAITO , Shoutaro ABE , Reo UEMURA , Yusuke TAKAHASHI , Shousaku ITOH , Mikako HAYASHI , Yuzo KAWANISHI , Shintaro OKA , Tomomi YAMADA , Mikiyo YAMAGUCHI , Yoko ASAHI , Maki SOTOZONO , Takumi KAGIOKA , Masakatsu WATANABE

    … <p> Purpose: Nickel-titanium (NiTi) rotary files are becoming more popular and an important part of the equipment for root canal treatment. … The superelasticity and shape memory of the instruments have improved the shaping procedures in root canal preparation, making it easier and faster. …

    The Japanese Journal of Conservative Dentistry 62(6), 263-270, 2019

    J-STAGE 

  • Consideration of Bending Stress in Curved Tooth of Small Size and High Strength Spiral Bevel Gear Fabricated by Five Axis Controlled Machining Center  [in Japanese]

    TOYOTA Shinya , SAITO Masahiro , SHIBATA Takashi , HIROGAKI Toshiki , AOYAMA Eiichi

    … We investigate the influence of the rib on the bending stress at the curved tooth root and demonstrate the effect of rib reinforcement at the proposed spiral bevel gear.</p><p>As a result, a novel guideline is found to design the small size and high strength spiral bevel gear with the rib at the end of face width.</p> …

    The Proceedings of Conference of Kansai Branch 2019.94(0), 110, 2019

    J-STAGE 

  • Comparison of Multi- and Single-File System of Ni-Ti Rotary File on Shaping Ability  [in Japanese]

    Kyoko ARAI , Koichiro MATSUDA , Rie YAMADA , Kayoko KITAJIMA , Yoshie KITANO , Takeo ASAHINA , Masaru IGARASHI

    … <p> Purpose: The purpose of this study was to compare the total preparation time, the amount of canal transportation and the pushing and pulling forces of the following four files: the single Ni-Ti file system (RECIPROC: RE), multi Ni-Ti files system (Twisted File: TF and ProTaper: PT) and stainless steel multi-file system (K-file: SSK).</p><p> Methods: Thirty-six transparent resin models which had curved root canals of 30 degrees were used (n=9, each). …

    The Japanese Journal of Conservative Dentistry 61(1), 40-47, 2018

    J-STAGE  Ichushi Web 

  • A novel technique for negotiating root canals  [in Japanese]

    Norihiro SAWADA , Kazunari MATOBA

    … <p><b>Abstract : </b>Nickel-titanium files can be used to prepare curved canals, but cannot penetrate the original canals if a previous dentist modified the root canal morphology. … This case report introduces a novel technique for negotiating root canals. …

    The Journal of Japan Endodontic Association 38(2), 107-113, 2017

    J-STAGE 

  • Investigation on Effective Education Methods for Preparing Curved Root Canals with FKG RaCe  [in Japanese]

    Mikiyo YAMAGUCHI , Motoki OKAMOTO , Yoko ASAHI , Tomomi YAMADA , Shousaku ITOH , Mikako HAYASHI , Yuki ITO , Naoko SUZAKI , Chihiro KATATA , Maki SOTOZONO , Yuzo KAWANISHI , Kouichi MASUDA , Yoshihiro ITOH , Naomichi YONEDA

    … <p> Purpose: Nickel-titanium (NiTi) files are becoming more popular for root canal treatments, since they have the clear advantage of maintaining the original shape of curved root canals because of their low elastic modulus and flexibility. … The present study assessed the educational effectiveness of preparing curved root canals with FKG RaCe in dental students' …

    The Japanese Journal of Conservative Dentistry 60(5), 255-261, 2017

    J-STAGE  Ichushi Web 

  • Micro computed tomography evaluation of the Self-adjusting file and ProTaper Universal system on curved mandibular molars

    SEREFOGLU Burcu , PİSKİN Beyser

    … <p>The aim of this investigation was to compare the cleaning and shaping efficiency of Self-adjusting file and Protaper, and to assess the correlation between root canal curvature and working time in mandibular molars using micro-computed tomography. …

    Dental Materials Journal 36(5), 606-613, 2017

    J-STAGE  Ichushi Web 

  • Evaluation of Curved-root Canal Preparation by ProTaper Next  [in Japanese]

    Kaori SHIMOJIMA , Ryoichiro WATANABE , Ikuya SATO , Noriko MUTOH , Nobuyuki TANI-ISHII

    …  Objective: File flexibility of the nickel-titanium (Ni-Ti) rotary file system was improved by M-Wire, which has made it possible to increase breakage resistance and shape severely curved root canals easily. … In the ProTaper Next system, which was used in the present study, files suitable for managing curved root canals were developed. …

    The Japanese Journal of Conservative Dentistry 59(3), 287-292, 2016

    J-STAGE  Ichushi Web 

  • The Study of Shaping Ability using WaveOne Gold:—Evaluation of Shaping between G-wire and M-wire Nickel-titanium File—  [in Japanese]

    Takeshi UEDA , Michiko HIRAMINE , Kaori SHIMOJIMA , Ryoichiro WATANABE , Ikuya SATO , Noriko MUTO , Nobuyuki TANI-ISHII

    … The enhancement of flexibility made with WaveOne Gold (Dentsply Maillefer, Switzerland) by G-wire makes quality endodontics available in curved root canals. … The purpose of this study was to analyze the shaping ability and working time in root canal shaping by the WaveOne Gold and WaveOne (Dentsply Maillefer) after glide path.<br> Methods: Seventy Endo-Training block canals (Dentsply Maillefer) were used, divided according to WaveOne Gold (Small, Primary, Medium & …

    The Japanese Journal of Conservative Dentistry 59(1), 111-118, 2016

    J-STAGE  Ichushi Web 

  • Usefulness of Cone-Beam Computed Tomography During the Endodontic Treatment of a Curved Root: A Case Report  [in Japanese]

    OKI EMI , WAKIMOTO NINA , MORI HIROSHI , UCHIDA KEIICHI , SUGINO NORIYUKI , TAGUCHI AKIRA , FUJII TAKEO

    … However, conventional intraoral radiography cannot display certain aspects such as the root canal morphology, status of the root apex, and anatomical relationships, and this may result in suboptimal treatment. … Here we report the use of cone-beam computed tomography (CBCT) to assess a mandibular right second premolar with a curved root, which provided accurate morphological information and aided in the establishment of an appropriate treatment plan. …

    Japanese Journal of Oral Diagnosis / Oral Medicine 28(3), 231-234, 2015

    J-STAGE  Ichushi Web 

  • A Power Output Estimate of Cylindrically-shaped Flexible Photovoltaic Module with Polygonal Approximation  [in Japanese]

    Shibasaki Mamoru , Yachi Toshiaki

    … In the present study, a new method is proposed for estimating the power output of a cylindrically-shaped flexible photovoltaic module, taking into account the uneven irradiation and temperature that occurs for a curved surface. … The temperature is calculated based on the root mean square of the irradiation over the area of the entire module. … The average and root mean square of the irradiation are calculated based on the directional dependence of the global horizontal irradiance. …

    IEEJ Transactions on Power and Energy 135(7), 454-461, 2015

    J-STAGE 

  • Developmental disturbance of a mandibular central incisor following trauma to the primary predecessor

    Tsurumachi Tamotsu , Hirano Yoriyuki , Hira Akiko , Aida Yasuyo , Ogiso Bunnai

    … Radiographic examination revealed crown dilaceration of the tooth, which had a curved root canal. …

    Journal of Oral Science 57(2), 157-160, 2015

    J-STAGE  Ichushi Web 

  • Analysis of Apical Foramen and Root Canal Morphology in Maxillary Lateral Incisor Using Micro-CT  [in Japanese]

    Ryoko AMANO , Ichiroh KATSUUMI

    …  Purpose: The maxillary lateral incisor is considered as a type of tooth, but it is difficult to treat because the prognosis after root canal filling is poor. … Effective treatment is also difficult because, even though it is a single-rooted canal anterior tooth, it is curved in the distal direction or in the lingual direction near the root apex. …

    The Japanese Journal of Conservative Dentistry 58(2), 117-123, 2015

    J-STAGE  Ichushi Web 

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