• Original Article

    Comparison of Healing of Allograft and Autogenous Bone Implanted in the Skull Defect of Beagle Dog: Preliminary Animal Study

    비글견의 두개골 결손부에 이식한 동종골과 자가골의 치유 비교: 예비 동물 실험

    Jung-Gon Lee, Sang-Yun Kim, Pil-Young Yun, Young-Kyun Kim

    이중곤, 김상윤, 윤필영, 김영균

    Purpose: The purpose of this study was to evaluate the healing process after autogenous and allogenous bone grafts for calvarial bone defects ... + READ MORE
    Purpose: The purpose of this study was to evaluate the healing process after autogenous and allogenous bone grafts for calvarial bone defects in beagles. Materials and Methods: Two defects were formed in the skulls of two beagles and then grafted with a freeze-dried bone allograft (Double-Oss) and an autogenous bone chip, respectively. The clinical, radiographic, and histomorphometric examination results of the specimens taken 4 and 8 weeks after bone grafting were analyzed. Results: The clinical, radiographic, and histological assessments revealed that 4 and 8 weeks after transplant, the beagle that received an autogenous bone graft was more likely to have high new bone formation than the beagle that had an allogenous bone. Four weeks after the transplant, the proportions of new bone formation were 11.5% and 35.8% in the allogenous and autogenous bones, respectively. Eight weeks after the transplant, the proportion of new bone formation with the allogenous bone increased significantly to 41.4% but was still less than the 65.6% with the autogenous bone. Conclusion: The amount of new bone formation was smaller and the formation rate was slower with allogenous bone graft than with autogenous bone graft. - COLLAPSE
    June 2018
  • Original Article

    Assessment of Bone Quality in Pre-dental Implant Site Using Periapical, Panoramic and Computed Tomography

    치근단 방사선사진, 파노라마 방사선 사진 및 전산화 단층 영상을 이용한 임플란트 시술 부위 골질의 평가

    Dongho Shin, Kyeong-Mee Park, Jae Joon Hwang, Wonse Park, Kee-Deog Kim

    신동호, 박경미, 황재준, 박원서, 김기덕

    Purpose: Radiological evaluation of bone quality as well as the shape of the alveolar bone of the edentulous part to be placed ... + READ MORE
    Purpose: Radiological evaluation of bone quality as well as the shape of the alveolar bone of the edentulous part to be placed is very important f or successf ul implant placement. Recently, three- dimensional analysis using computed tomography and cone beam computed tomography has been actively used before implant surgery, but periapical and panoramic radiographs have been used for a long time to evaluate alveolar bone using low radiation doses. The purpose of this study was to compare the Hounsfield unit value of CT after dividing maxillary, mandibular, anterior, and posterior teeth into whether periapical and panoramic radiographs could be effectively used for bone quality evaluation. Materials and Methods: The periapical x-ray, panoramic x-ray, and conventional CT were taken from a total of 100 patients who have undergone the implant treatment. For 3D analysis, the virtual implants with a diameter of 4 mm and a length of 10 mm were placed in the implant planning software and the bone quality of 1 mm circumference was measured by Hounsfield unit value. Periapical x-ray and panoramic x-ray were also evaluated for bone quality. The degree of agreement among them was evaluated. Results: In 3D image analysis, reformatted cross-sectional, panoramic image analysis, bony quality evaluation similar to CT analysis was possible in maxillary anterior/posterior teeth with periapical and panoramic radiographs. Conclusion: Periapical and panoramic radiographs could be used to evaluate the implant bone quality of the maxillary anterior and maxillary posterior. - COLLAPSE
    June 2018
  • Original Article

    Retrospective Study on Distortion of Alveolar Bone Height in Panoramic Radiographs of Edentulous Korean Male Patients

    한국인 남성 무치악환자에서 파노라마 방사선사진상의 치조골 높이 왜곡에 대한 후향적 연구

    Joo-Hyun Baik, Young-Gyun Song

    백주현, 송영균

    Purpose: The purpose of this study was to analyze the mean residual alveolar bone height according to various measuring points of male ... + READ MORE
    Purpose: The purpose of this study was to analyze the mean residual alveolar bone height according to various measuring points of male edentulous patients. And to compare the residual alveolar bone height differences observed in panoramic and computed tomography images for analyzing the predictable distortion trends in panoramic radiography. Materials and Methods: The study used 40 images of the maxilla and mandible, excluding computed tomography and panoramic images. Based on the anatomical indices, the measurement values of each image were obtained by setting 7 measuring points of the maxilla and 9 measuring points of the mandible. The significant difference was statistically analyzed by paired t test comparing the measurement values observed on computed tomography and panoramic radiography (p<0.05). Results: The mean residual alveolar bone height was more than 15.5 mm in the maxillary anterior part, 8.2 mm in posterior part, 27.7 mm in the mandibular anterior part, and the mandibular posterior part was 11.1 mm. The result of paired t-test comparing the computed tomography and panoramic images showed that the maxillary right central incisor position, maxillary left second premolar, maxillary right second premolar, mandibular left first premolar, mandibular right first premolar, mandibular left second premolar, mandibular right second premolar, mandibular left first molar, mandibular right first molar positions of residual alveolar bone height were significantly different between two images.(p<0.05). Conclusion: It is considered that the reliability of the panoramic radiography is low because there is a significant difference in the residual alveolar bone height observed on computed tomography and panoramic radiography images. - COLLAPSE
    June 2018
  • Case Report

    Placement of a Retro-fitted Single Crown Restoration Under an Existing Denture by Employing Digital Technology: A Case Report
    Kyung Chul Oh, June-Sung Shim
    This article demonstrates a case that successfully placed a retro-fitted crown restoration under an existing denture by employing the characteristics of digital ... + READ MORE
    This article demonstrates a case that successfully placed a retro-fitted crown restoration under an existing denture by employing the characteristics of digital technology. Scanned data of the arch that involves edentulous area, and of the old denture itself were obtained and superimposed on each other. A virtual crown was modeled in computer-aided design software with marginally larger than the ideal size. The old denture was regarded as an adjacent tooth in the setting menu so that the portion of the virtual crown that extends over to the old denture could be automatically deleted by selecting the “Cut intersections” option. This retro-fitted crown was milled with a polymethylmethacrylate disc after a minor adjustment of its contour. The crown and the old denture were placed in the patient’s mouth, and resulted in favorable esthetic outcome and occlusion, showing proper relationship with the old denture. - COLLAPSE
    June 2018
  • Review Article

    Clinical Results for Maxillary Implant Overdentures with Prosthetic Systems: A Literature Review

    상악 임플란트 오버덴처의 보철적인 형태에 따른 임상적 결과의 문헌적 고찰

    Seonghee Choi, Sunjai Kim, Jae-Seung Chang

    최승희, 김선재, 장재승

    Background: The two-implant overdenture should be considered as the first treatment option for mandibular edentulous patients. But for the maxilla, there is ... + READ MORE
    Background: The two-implant overdenture should be considered as the first treatment option for mandibular edentulous patients. But for the maxilla, there is no widely accepted consensus yet. In this study, implant survival rate, clinical evaluations, marginal bone loss of the maxillary overdenture were investigated. Materials and Methods: “Maxillary overdenture” was the key word of this study, and with the combination of “attachment system”, “implant number”, “implant survival rate”, “clinical evaluation” and “marginal bone loss”, 21 journals were searched by “Pubmed”. Results: There were no differences in the survival rate according to the attachment systems and implant numbers. Especially, maxillary overdentures with four or more implants showed excellent results. Clinical parameters and marginal bone loss were not affected by attachment systems and implant numbers. Conclusion: For successful maxillary implant overdenture treatment, four or more implants can be considered using various attachment systems. - COLLAPSE
    June 2018