The International Journal of Microdentistry
Online ISSN : 2436-3219
Print ISSN : 2151-4143
Current issue
Displaying 1-5 of 5 articles from this issue
  • Seiki Toda
    2023 Volume 14 Issue 2 Pages 76-80
    Published: 2023
    Released on J-STAGE: February 29, 2024
    JOURNAL FREE ACCESS

    The effects of overgrown gingiva, bleeding, and exudate can interfere with the treatment of caries extending below the gingival margin. Deep margin elevation is a method of restoring caries that has progressed below the gingival margin in which the restoration margin is elevated above the gingival margin. We conducted deep margin elevation using a microscope and a semiconductor laser, carrying out ceramic inlay restoration with an intra-oral scanner (CEREC Omnicam, Dentsply Sirona) for the successful conduct of precise, minimally invasive restoration.

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  • Yoshinori Nokame
    2023 Volume 14 Issue 2 Pages 82-91
    Published: 2023
    Released on J-STAGE: February 29, 2024
    JOURNAL FREE ACCESS

    Conventionally, matrix use is required for Class 2 cavity fillings. However, it entails a number of problems, including the fact that there are many circumstances under which matrix placement itself is difficult, as well as the difficulties of achieving a fit that can be described as perfect under microscope observation and of reproducing proximal surface morphology that comprises anything but a single contour. Filling methods using flow control have recently been described for use in cavities that occupy a relatively restricted area, but this method is more difficult to achieve when extensive filling is required. I have devised a novel technique that enables the filling of extensive Class 2 cavities without the use of a matrix. This method uses microscope illumination to start the gradual hardening of flow resin while reproducing the proximal surface morphology by building up layers of resin in three dimensions in the same way as a material-jetting 3D printer. The use of this method enables the recreation of the shape of the proximal surface and the contact point for even comparatively large proximal surface cavities without the use of a matrix.

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  • Kazuo Kitamura, Jumpei Iizuka, Tatsuroh Atumi, Shuntaro Nakayama, Kato ...
    2023 Volume 14 Issue 2 Pages 92-98
    Published: 2023
    Released on J-STAGE: February 29, 2024
    JOURNAL FREE ACCESS

    The radix entomolaris (RE) is difficult to treat because the distolingual root is remarkably thin and extremely curved. In general, dental X-ray examinations tend to be insufficient due to confirm the complex root canal morphology. However, the cone-beam computed tomography (CBCT) can strongly support clinicians who want to treat these complex unusual cases, as it allows for accurate detection of root and root canal morphologies in three dimensions. In a recent case, we performed the root canal treatment on the mandibular left first molar using the dental operative microscope. Prior to the procedure, we detected three roots /five root canals, including the RE, and the second distobuccal root canal (DB2) through pre-clinical examination utilizing CBCT. When clinicians encounter complex root canals including the RE or DB2, micro-endodontic treatments with proper diagnosis based on a pre-treatment planning, as well as an adequate cleaning and shaping protocols are crucial points that lead to success.

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  • Takenori Uto
    2023 Volume 14 Issue 2 Pages 100-108
    Published: 2023
    Released on J-STAGE: February 29, 2024
    JOURNAL FREE ACCESS

    Recent years have seen the widespread adoption of digital technology in dentistry, and this is proving convenient not only for the creation of prosthetic devices, but also for impression-taking. In dental restoration treatment, the restoration must be of the correct thickness to prevent it breaking or chipping. This means that the right amount of clearance must be secured during abutment tooth preparation. Lingual-side preparation is particularly susceptible to insufficient preparation volume. The use of a dental intraoral scanner (IOS) in addition to conventional analog methods such as wax impressions to secure the right amount of clearance enables digital visualization. After checking the digital view during abutment tooth preparation, analyzing the data thus obtained and using this information to carry out preparation in the magnified view provided by a microscope helps improve the accuracy and precision of the restoration.

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  • Aoi Ide, Tatsuya Hasegawa, Katofumi Koyanagi, Keisuke Saigusa, Koyuki ...
    2023 Volume 14 Issue 2 Pages 110-117
    Published: 2023
    Released on J-STAGE: February 29, 2024
    JOURNAL FREE ACCESS

    Access cavity preparation is a crucial step which can influence the clinical prognosis in the root canal treatment entirely. Iatrogenic events during this procedure occasionally cause the irreversible condition. Moreover, less experienced dentists tend to more induce these situations than the experienced. Our hypothesis is that recognition of orifice locations by the less experienced has specific biases and tendencies. In a current study, X and Y coordinates were determined by location of circle stickers and drawings on blank figures of an occlusal surface at the maxillary right first molar and second molar from dental residents (n=73) and general dentists (n=75). The recognition of orifice locations and access outlines was evaluated by difference between coordinates based on the central reference point in each group and typical access criteria. Our results showed a significant difference in orifice recognition between the resident group and the general dentist group. Moreover, because of this bias, a shape of the access outline was set excessively on the distal side in the resident group compared to the general dentist group. Therefore, less experienced dentists should consider that revision of their deviation, especially in the distal direction, which can contribute to higher probability of success.

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