• Original Article

    Clinical Evaluation of Lithium Disilicate Pressed Zirconia and Monolithic Zirconia in Posterior Implant-Supported Prostheses
    Kyoung-Woo Roh, Dong-Seok Yang, Young-Chan Jeon, Chang-Mo Jeong, Mi-Jung Yun, So-Hyoun Lee, Jae-Won Choi, Jin-Ju Lee, Eun-Bin Bae, Jung-Bo Huh
    Purpose: The purpose of this study was to compare the clinical outcomes of lithium disilicate pressed zirconia prostheses and monolithic zirconia prostheses ... + READ MORE
    Purpose: The purpose of this study was to compare the clinical outcomes of lithium disilicate pressed zirconia prostheses and monolithic zirconia prostheses, which are widely used as posterior implant restorations, after 12 months of follow-up. Material and Methods: A total of 17 patients were treated with 60 implant-supported prostheses. After examination of implant survival rate, marginal bone loss, probing depth, plaque index, bleeding index, calculus index, and complications, independent T-test and chi-square test were performed to compare each group (Lithium disilicate pressed zirconia prostheses: n=30, Monolithic zirconia prostheses: n=30). Results: The implant survival rate was 100%. Marginal bone resorption was higher in the monolithic zirconia prostheses group (p<0.05). Probing depth, plaque index, calculus index, and bleeding index were higher in the lithium disilicate pressed zirconia prostheses group (p<0.05). Complications occurred in the monolithic zirconia prostheses group as connector fracture, and in the lithium disilicate pressed zirconia prostheses group as chipping. Conclusion: The periodontal index of lithium disilicate pressed zirconia was slightly worse, but the bone resorption was lower and only one chipping occurred on veneered layer. Therefore, lithium disilicate pressed zirconia is considered as a promising treatment option as much as monolithic zirconia in posterior implant-supported prostheses. However, long-term clinical studies are needed for reliable results (IRB No. PNUDH- 2014-001-MD). - COLLAPSE
    March 2019
  • Clinical or Case Report

    Implant-Supported Fixed Dental Prostheses with New Retention Type Using Zirconia Ball and Nickel-Titanium Spring

    지르코니아 볼과 니켈-티타늄 스프링을 이용한 새로운 유지 형태를 가진 임플란트 고정성 보철물 수복 증례

    Jae-Won Choi, Chan-Hong Song, Jung-Bo Huh

    최재원, 송찬홍, 허중보

    EZ Crown system (EZC), a new retention type implant prosthetic system that has not only easy retrievability but also no complication due ... + READ MORE
    EZ Crown system (EZC), a new retention type implant prosthetic system that has not only easy retrievability but also no complication due to residual cement, was developed to overcome the problems of conventional retention mechanisms (screw-retained, cement-retained, and combined screw-and cement-retained) of implant-supported fixed dental prostheses. In this case report, we introduce clinical experience with a 6-month follow-up of zirconia fixed dental prosthesis fabricated with EZC. Under normal oral function, no removal or fracture of the EZC prosthesis was observed and no inflammatory findings were observed in the peri-implant soft tissue due to residual cement. EZC is expected to be used in various clinical cases in the future. - COLLAPSE
    March 2019
  • Clinical or Case Report

    A Completely Cast-Free, Digital Workflow for Fabricating an Implant-Supported Prosthesis with a New Coded Healing Abutment
    Ju-Hyoung Lee
    The BellaTek Encode System introduced an innovative concept of a healing abutment-level impression. As the coded healing abutment is unscrewed only at ... + READ MORE
    The BellaTek Encode System introduced an innovative concept of a healing abutment-level impression. As the coded healing abutment is unscrewed only at the placement session, the mucosal barrier at an implant is preserved and the clinical process is simplified. The laboratory process is also streamlined, as the entire process of a definitive dental implant abutment is outsourced and a dental technician fabricates only a definitive crown on a modified cast by robotic drilling or a stereolithography additive cast. However, potential errors may occur in the fabrication process of the casts. In addition, this system is available to only a specific implant system. This article describes a fully integrated digital workflow to overcome the limitations with a newly developed coded healing abutment. With the merging of advanced digital technologies, an implant-supported prosthesis can be accurately fabricated in an hour with minimized abutment dis/reconnection and no physical cast. - COLLAPSE
    March 2019
  • Clinical or Case Report

    Strategy of Esthetic Implant Restoration in Maxillary Anterior Teeth with Severely Resorbed Labial Bone Plate: A Case Report

    순측 골판이 소실된 상악 전치의 임플란트 심미 수복 전략: 증례보고

    Eun-Young Kwon, So-Hyoun Lee, Hyun-Joo Kim, Ju-Youn Lee, Ji-Young Joo

    권은영, 이소현, 김현주, 이주연, 주지영

    As implant procedures become more common, many patients require more aesthetic restoration and shorter treatment periods. Maxillary anterior dentition is very challenging ... + READ MORE
    As implant procedures become more common, many patients require more aesthetic restoration and shorter treatment periods. Maxillary anterior dentition is very challenging site for esthetic final restoration. It becomes more difficult at the site of labial bone resorption. A strategy for esthetics is necessary before extraction. Nineteen years old girl had maxillary anterior teeth with external root resorption and severe resorbed labial plate due to inflammation. Before extraction, antibiotics and anti-inflammatory drugs were administered to relieve the infection and inflammation. Eight weeks after extraction, implant was placed using computer guided surgery. Guided bone regeneration with transmucosal healing was performed and then, fixed provisional restoration was delivered immediately. Soft tissue molding was performed with modification of provisional crown for 6 months. We achieved esthetic final implant restoration in compromised maxillary anterior teeth. - COLLAPSE
    March 2019
  • Review Article

    Considerations for Fabrication of CAD-CAM Abutments: Part I. Selection of Titanium Block and Fabrication Process

    CAD-CAM 맞춤 지대주 제작 시 고려사항: I. 환봉선택 및 제작과정을 중심으로

    Kyung-Ho Ko, Jong-Hyun Park, Lee-Ra Cho

    고경호, 박종현, 조리라

    Custom abutment fabrication using computer aided design–computer aided manufacturing (CAD-CAM) technology is an efficient method that can be used to overcome ... + READ MORE
    Custom abutment fabrication using computer aided design–computer aided manufacturing (CAD-CAM) technology is an efficient method that can be used to overcome complications associated with tilted implant installation and esthetics. This technology is becoming increasingly popular due to its convenience. However, CAD-CAM abutments are often misused because many clinicians did not consider the various factors involved in their use. Herein, we investigate the factors that must be considered during the fabrication of CAD-CAM abutments, problems using compatible abutments. - COLLAPSE
    March 2019