• Original Article

    Retrospective Observational Study of Narrow Diameter Implants

    좁은 직경 임플란트의 후향적 관찰 연구

    Jung-Gon Lee, Dong-Woo Kang, Pil-Young Yun, Young-Kyun Kim

    이중곤, 강동우, 윤필영, 김영균

    Purpose: To Analyse clinical treatment outcomes and prognosis of patients who have received narrow diameter implants due to anterior tooth loss, and ... + READ MORE
    Purpose: To Analyse clinical treatment outcomes and prognosis of patients who have received narrow diameter implants due to anterior tooth loss, and to assess long-term success measured through radiological examination. Material and Methods: From December 2006 to June 2017, Thirty-six patients were selected, and fifty-two narrow diameter implants were inserted by 1 surgeon. All prosthetic appliance were fabricated by the two prosthodontist. The dental records of each patient were reviewed. Measuring of marginal bone loss and accessing implant success rate were performed. Results: Thirty-nine NR lines (Dentium, Suwon, Korea) and thirteen Slim lines (Dentium, Suwon, and Korea) were inserted. The implant used was 2mm to 4.3mm in diameter and 9mm to 12mm in length. NR line implant success rate was 87.2%, survival rate was 92.1%, and Slimline line implant success rate was 92.3%, and survival rate was 92.3%. The average marginal bone loss was 0.22±0.4 mm and 0.07 ± 0.23 mm respectively. Conclusion: The narrow diameter implant is a reliable implant treatment that can be used in patients with problems with tooth loss. The success rate between the NR line and the slim lines implant was not significantly different and was clinically acceptable. - COLLAPSE
    September 2019
  • Original Article

    Mechanical Complications of Posterior Implant Restorations using CAD/CAM Titanium Customized Abutments: A Retrospective Study

    CAD/CAM 티타늄 맞춤 지대주로 수복한 구치부 임플란트에서의 기계적 합병증에 대한 후향적 연구

    Minyoung Yang, Jae-Seung Chang, Woon Ji, Sunjai Kim

    양민영, 장재승, 지운, 김선재

    Purpose: The purpose of this retrospective study was to evaluate the incidence of mechanical complications of the posterior implant-supported fixed dental prosthesis ... + READ MORE
    Purpose: The purpose of this retrospective study was to evaluate the incidence of mechanical complications of the posterior implant-supported fixed dental prosthesis (p-ISFDP) using computer-aided design and computer-aided manufacturing (CAD/CAM) titanium customized abutments and to evaluate the influencing factors on complications. Material and Methods: The incidence and consequences of mechanical complications in p-ISFDPs over a mean follow up period of 54.43 ± 6.24 months were assessed based on electronic documentations from 138 patients with 266 implants. All p-ISFDP utilized CAD/CAM titanium customized abutments, and were fabricated with cement-retained prostheses with occlusal screw access holes. Statistical analyses were performed to identify the risk factors of mechanical complications. Results: During the observation period (3 - 5 years), implant survival rates were 100%. Major mechanical complications were 8 abutment fractures (3.01%), 8 screw loosenings (3.01%), 2 screw fractures (0.75%), 11 chipping or fractures of veneering materials (5.58%), 23 decementations of the superstructure (11.68%). The relationship between the incidence of mechanical complications and the possible factors were not statistically significant(p > .05). Conclusion: There is no significant difference between each mechanical complication and the risk factors. P-ISFDP fabricated with CAD/CAM titanium abutments is a clinically acceptable treatment. - COLLAPSE
    September 2019
  • Original Article

    Comparison of Mechanical Properties of Milled and Casted Cobalt-Chromium Alloys Using Three-point Bending Test

    밀링 방법과 주조 방법으로 제작한 코발트-크롬 합금의 3점 굽힘 시험을 통한 기계적인 특성 비교

    Joon-Ki Hong1, Seong-Kyun Kim1*, Seong-Joo Heo1, Jai-Young Koak1 and Jin-Soo Ahn2

    홍준기, 김성균, 허성주, 곽재영, 안진수

    Purpose: The objective of this study was to investigate the mechanical properties of Cobalt-Chromium (Co-Cr) alloys made by conventional casting method and ... + READ MORE
    Purpose: The objective of this study was to investigate the mechanical properties of Cobalt-Chromium (Co-Cr) alloys made by conventional casting method and Computer-Aided Design/Computer –Aided Manufacturing (CAD-CAM) milling method. Material and Methods: Co-Cr alloy specimens (n=8) were made by casting and milling methods. The size of the specimens was 34 mm × 13 mm × 1.5 mm, according to ISO 22674: 2016. Three-point bending test was conducted by universal testing machine, stress and strain values were obtained. Statistical significance was tested using the t-test. Results: Flexural strength of the milled sample was significantly lower than of casted (p < 0.05). Similarly, 0.2% yield strength of milled sample was also lower than of casted (p < 0.05). Conclusion: Although there is a significant difference in mechanical properties of milled and casted Co-Cr alloy, they are both are clinically acceptable. - COLLAPSE
    September 2019
  • Clinical or Case Report

    Orocutaneous Fistula after Implant Placement with Sinus Floor Elevation via Transalveolar Approach: A Case Report

    치조정 접근법을 통한 상악동 거상술을 동반한 임플란트 식립 후 발생한 구강피부누공의 치험례

    Ji-Hyun Kim and Kwan-Soo Park

    김지현, 박관수

    There have been several case reports about a formation of orocutaneous fistula associated with odontogenic or implant infection. This case is about ... + READ MORE
    There have been several case reports about a formation of orocutaneous fistula associated with odontogenic or implant infection. This case is about a rapid formation of an orocutaneous fistula, which hardly can be seen, only 7 days after implant placement with sinus floor elevation via transalveolar approach. It was completely healed after incision and drainage, followed by administration of suitable antibiotics without removal of implant fixture. Trauma during the operation and opportunistic infection by normal oral flora might be the cause of the fistula. It is important to maintain an aseptic environment before and during an operation with minimal invasive approach for prevention of complications including an orocutaneous fistula. - COLLAPSE
    September 2019
  • Clinical or Case Report

    Atraumatic Removal of Displaced Implant in the Fatty Bony Marrow
    Buyanbileg Sodnom-Ish, Mi Young Eo, Truc Thi Hoang Nguyen, Yun Ju Cho, Myung Joo Kim, Soung Min Kim
    A 53-year-old Korean female was referred to the Department of Oral and Maxillofacial Surgery at the Seoul National University Dental Hospital. The ... + READ MORE
    A 53-year-old Korean female was referred to the Department of Oral and Maxillofacial Surgery at the Seoul National University Dental Hospital. The patient’s chief complaint and concern involved the occasional feeling of discomfort and pain in the region of the lower right second molar. Panoramic radiograph revealed a #47 implant fixture that was dislocated horizontally deep in the fatty degenerated area of the posterior mandible. A rare case of implant displacement into the fatty degenerated area of the posterior mandible caused inferior alveolar nerve (IAN) compression. Fatty degeneration is a condition that occurs in mostly elderly female patients due to aging and is inevitable. We recommend accurate preoperative evaluation using radiographic imaging techniques such as computer tomography and histopathological analysis for differential diagnosis. Endoscopic intraoperative examinations can reduce the invasiveness of the surgery and provide accuracy in examining the intactness of the IAN. This case report suggests the efficacy of the selected method of treatment and, the removal of the displaced implant and decompression of the IAN using endoscopic visualization followed by 8 months of healing and two-stage implant installation with guided bone regeneration in cases of related implant complications. - COLLAPSE
    September 2019