• Original Article

    Implant Stability Change Measurement of Flaplessly Placed Immediate Implant on Mandibular First Molar
    Yang-Yeol Tae, Chan-Ho Jung, Kwan-Soo Park
    Purpose: This study aims to evaluate the stability change of implants placed immediately after extraction of the mandibular first molar with Resonance ... + READ MORE
    Purpose: This study aims to evaluate the stability change of implants placed immediately after extraction of the mandibular first molar with Resonance Frequency Analysis (RFA).Materials and Methods: For 24 patients, 25 implants with sandblasted, large grit, and acid-etched (SLA) surface were placed with flapless surgery. Implant stability at implant placement and impression taking procedure were measured with Osstell ISQ. The average interval between implant placement and impression taking was 1.82 months, and implants' success rate was 100%. The average follow-up period was 23.8 months.Results: The average RFA value of implants measured in all directions increased by 6.4, and the average RFA value measured in the buccolingual direction increased by 5.9. Moreover, the average RFA value measured in the mesiodistal direction increased by 6.9. There was a statistically significant difference between the buccolingual side's RFA value and the RFA value in the mesiodistal side at implant placement. There was not a completely linear relationship between the RFA value at implant placement and insertion torque.Conclusion: The change of RFA value can be a useful evaluation method for implant stability of the immediately placed implant after tooth extraction. It may help evaluate the healing of immediately placed implant and determine the appropriate loading time. - COLLAPSE
    September 2020
  • Clinical or Case Report

    Adjunctive use of Gel-type Desiccating Agent for Regenerative Surgical Treatment of Peri-implantitis in Patients with Inaccessible Implant Surface: A Case Report
    Do-Hyung Kim, Seong-Nyum Jeong, Jae-Hong Lee
    Peri-implantitis is a chronic inflammatory disease with alveolar bone loss, and one of the most common biological complications of dental implants. Various ... + READ MORE
    Peri-implantitis is a chronic inflammatory disease with alveolar bone loss, and one of the most common biological complications of dental implants. Various approaches have been introduced and developed for the treatment of peri-implantitis, but none of the them have clearly shown better treatment outcomes or fewer biological complications. Especially in cases of peri-implantitis around an implant with limited accessibility, non-surgical or surgical treatment with mechanical debridement is often insufficient to disinfect contaminated implant surface. To improve the result of implant surface disinfection, various mechanical and chemical decontamination agents have been introduced. In this case report, gel type desiccating agent was used to disinfect the inaccessible surface of dental implants. Both cases in this report showed successf ul clinical and radiographic outcome up to 6 months of follow up. - COLLAPSE
    September 2020
  • Clinical or Case Report

    Radiographic Evaluation of Surgical Treatment of Peri-implantitis with Bone Graft Procedure: Case Report
    Bo-Ram Nam, Yeon-Tae Kim, Jae-Hong Lee, Seong-Nyum Jeong
    The purpose of this case report was to radiographically evaluate the long-term effect of surgical treatment of peri-implantitis defects using bone graf ... + READ MORE
    The purpose of this case report was to radiographically evaluate the long-term effect of surgical treatment of peri-implantitis defects using bone graf t procedure for more than 3 years af ter operation. 2 cases of patients who had peri-implantitis induced intrabony defect were included in this study. Patients were treated by surgical procedure which consists of mechanical debridement with air abrasive system and titanium curette, chemical decontamination with tetracycline, and regenerative approach using synthetic bone or xenogenic bone. Clinical reduction of probing pocket depth and radiographic evidence of bone gain was observed and maintained in both patients for 3 years after surgery. Within the limitation of this case report, bony defects were managed effectively by surgical treatment with regenerative bone graft procedure. - COLLAPSE
    September 2020
  • Clinical or Case Report

    Abutment-Level Digital Impression Using Abutment Matching Algorithm, And Insurance-Covered Implant Prosthesis By Metal 3D Printing: A Case Report
    In-Ho Kang, Ji-Man Park, June-Sung Shim
    In the process of manufacturing implant-fixed prostheses, it has traditionally required complicated procedures such as impression taking, master cast fabrication, wax-up and ... + READ MORE
    In the process of manufacturing implant-fixed prostheses, it has traditionally required complicated procedures such as impression taking, master cast fabrication, wax-up and so on, but recently, digital impression with an intraoral scanner and workflow using computer-aided design/computer-aided manufacturing (CAD/CAM) make it possible to simplify the series of procedures mentioned above. This case report presents the implant-fixed prosthesis on posterior area using digital technology. The implant was placed in the planned position using a computer-guided implant surgical template on the first and second molars of lower right, and after 5 days of implantation, the customized abutments and provisional prostheses were delivered. The occlusal changes were evaluated through regular check-up, and the definitive prosthesis was fabricated using an intraoral scanner. A 3D images of provisional prostheses were acquired through a pre-op scan, and an automatic abutment matching algorithm on the intraoral scanner sof tware was used to acquire the scan data. The definitive impression on the second premolar area of upper left which was covered by implant insurance was obtained with intraoral scanner using scanbody. For insurance coverage, the prosthesis was made of porcelain-fused-to-metal crown, and the metal coping was designed by CAD program and then fabricated by metal 3D printing. The porcelain on the buccal side was built by the traditional procedure. By abutment-level impression with automatic abutment matching f unction, it was possible to precisely obtain the subgingival margin without the need for gingival retraction cord. Moreover, the metal coping made by metal 3D printing was clinically acceptable. - COLLAPSE
    September 2020
  • Review Article

    Application of Deep Learning in Dentistry and Implantology
    Dae-Young Kang, Hieu Pham Duong, Jung-Chul Park
    Artificial intelligence and deep learning algorithms are infiltrating various fields of medicine and dentistry. The purpose of the current study was to ... + READ MORE
    Artificial intelligence and deep learning algorithms are infiltrating various fields of medicine and dentistry. The purpose of the current study was to review literatures applying deep learning algorithms to the dentistry and implantology. Electronic literature search through MEDLINE and IEEE Xplore library database was performed at 2019 October by combining free-text terms and entry terms associated with ‘dentistry’ and ‘deep learning’. The searched literature was screened by title/abstract level and full text level. Following data were extracted from the included studies: information of author, publication year, the aim of the study, architecture of deep learning, input data, output data, and performance of the deep learning algorithm in the study. 340 studies were retrieved from the databases and 62 studies were included in the study. Deep learning algorithms were applied to tooth localization and numbering, detection of dental caries/periodontal disease/ periapical disease/oral cancerous lesion, localization of cephalometric landmarks, image quality enhancement, prediction and compensation of deformation error in additive manufacturing of prosthesis. Convolutional neural network was used for periapical radiograph, panoramic radiograph, or computed tomography in most of included studies. Deep learning algorithms are expected to help clinicians diagnose and make decisions by extracting dental data, detecting diseases and abnormal lesions, and improving image quality. - COLLAPSE
    September 2020