• Original Article

    Long-term Retrospective Study on Cumulative Survival Rate of Implants with Guided Bone Regeneration

    골유도재생술을 동반한 임플란트의 생존율에 대한 연구

    Suk-Hyun Jung†, Jun-Hwan Kim†, Da-Jeong Namgung, Yun-Jeong Kim, Jaeeun Chung, Young Ku*

    정석현†, 김준환†, 남궁다정, 김윤정, 정재은, 구 영*

    Purpose: The purpose of this study was to analyze the cumulative survival rate of dental implants installed with guided bone regeneration (GBR), ... + READ MORE
    Purpose: The purpose of this study was to analyze the cumulative survival rate of dental implants installed with guided bone regeneration (GBR), and also elucidate the factors related with the survival of dental implants. Material and Methods: This retrospective study was conducted on 148 dental implants installed in 76 patients by one specialist (Y.K.) at the Department of Periodontology and Implant Center, Seoul National University Dental Hospital from 2001 to 2010. The cumulative survival rates were obtained by the Kaplan-Meier method. The correlations between various factors and dental implant survival were analyzed by using the log-rank test and Cox proportional hazards model. Results: Among 148 dental implants installed in 76 patients, 8 implants in 7 patients were lost and the cumulative survival rates up to 5-years and 10-years were 97% and 89%, respectively. Gender, smoking status and location of implant were significantly associated with the cumulative survival rate of implants (p < 0.05). Age, history of hypertension and diabetes were not significantly associated with the cumulative survival rate of implants (p > 0.05). Conclusion: The dental implants installed with guided bone regeneration is predictable technique according to the results of cumulative survival rate over 10 years. - COLLAPSE
    December 2018
  • Original Article

    Soft Tissue Measurement Method Using Radiopaque Material on Cone-beam Computed Tomography: An Ex Vivo Validation Study
    Hae-Seok Lee, Jeong-Ho Yun, Dong-Won Lee*
    Purpose: The purpose of this study was to investigate the validity and reproducibility of a method based on cone-beam computed tomography (CBCT) ... + READ MORE
    Purpose: The purpose of this study was to investigate the validity and reproducibility of a method based on cone-beam computed tomography (CBCT) technology for the visualization and measurement of gingival soft-tissue dimensions. Material and Methods: A total of 66 selected points in soft-tissue of the ex vivo head of an adult pig were investigated in this study. For the measurement of radiographic thickness (RT), wet soft-tissue surfaces were lightly covered with barium sulfate powder using a powder spray. CBCT was taken and DICOM files were assessed for soft-tissue thickness measurement at reference points. A periodontal probe and a rubber stop were used for the measurement of trans-gingival probing thickness (TPT). After flap elevation, actual thickness of soft-tissue (actual thickness, AT) was measured. Correlation analysis and intraclass correlation coefficients analysis (ICC) were performed for AT, TPT, and RT. Results: All variables were distributed normally. Strong significant correlations of AT with RT and TPT values were found. The two ICC values between TPT vs. AT and RT vs. AT differed significantly. Conclusion: Our results indicated that correlation of RT was stronger than that of TPT with AT. We concluded that soft tissue measurement with CBCT could be a reliable method, compared to the trans-gingival probing measurement method. - COLLAPSE
    December 2018
  • Clinical or Case Report

    Alveolar Ridge Preservation of Maxillary Molars for Implant Placement Without Sinus Lift Surgery: Case series

    상악동 거상술을 동반하지 않는 치조제 보존술: 증례연구(Case series)

    Hag-Yeon Cho, Chang-Wan Suh, Hieu Pham Duong, Sung-Jo Lee, In-Woo Cho, Hyun-Seung Shin, Ki-Tae Koo, Stefan Fickl, Jung-Chul Park*

    조학연, 서창완, Hieu Pham Duong, 이성조, 조인우, 신현승, 구기태, Stefan Fickl, 박정철*

    Sinus lift procedure is frequently required for the maxillary molar implant placement. Previous studies have demonstrated alveolar ridge preservation (ARP) can maintain ... + READ MORE
    Sinus lift procedure is frequently required for the maxillary molar implant placement. Previous studies have demonstrated alveolar ridge preservation (ARP) can maintain the dimensions of ridge height and width. However, there is a lack of studies which evaluated the effect of ARP to avoid sinus lift procedure. Purpose of this study is to describe a method reducing the need of sinus lift surgery by ARP in maxillary molar areas and to assess the feasibility clinically, radiologically and histologically. Ten maxillary molars in ten patients had severe vertical bone resorption with minimal residual bone height. They were considered having the high possibility of the necessity of sinus lift procedure for dental implant after the extraction. After extraction, open healing ARP with deproteinized bovine bone mineral mixed with 10% collagen and resorbable collagen membranes was performed. After sufficient healing, dental implants were placed, and evaluated clinically and radiologically. Histological observation was conducted just before the implantation in one patient. Implants were successfully placed without sinus lift in all ten cases. All the implants were restored with no sign of complications, and patients are now in a close follow-up up to 20 months post-loading. Histological observation showed minimal inflammatory reaction and newly formed bone was substantially noted. The ARP technique has successfully avoided the sinus lift surgeries. It appears that this procedure may improve the simplicity of the clinical process for the clinicians and reduce the discomfort of patients. - COLLAPSE
    December 2018
  • Clinical or Case Report

    Spontaneous Discharge of a Dental Implant Displaced Into Maxillary Sinus: A Case Report

    자발적으로 배출된 상악동 내 함입되었던 임플란트: 증례보고

    Seung-Yeon Cho, Su-Yeon Kim, In-Soo Kim, Won Lee*

    조승연, 김수연, 김인수, 이 원*

    This case report is to report an extraordinary case of the spontaneous discharge of a dental implant. A 45-year-old woman was referred ... + READ MORE
    This case report is to report an extraordinary case of the spontaneous discharge of a dental implant. A 45-year-old woman was referred to our department complaining of symptoms of acute Maxillary sinusitis. She underwent a computed tomography scan that revealed a dental implant dislocated in the maxillary sinus. A preoperative medical treatment [Amoxicillin - Clavulanate (375 mg) and Streptokinase-Streptodornase (12500IU)] three times a day for two weeks was administered in order to prepare her for surgery. Unexpectedly, she reported that she had discharged the implant from mouth in the early morning. Mucociliary clearance in combination with a local osteolytic inflammatory process and mucolytics therapy are the likely causes of this unusual discharge. - COLLAPSE
    December 2018
  • Clinical or Case Report

    Clinical Evaluation of Guided Bone Regeneration Using 3D-titanium Membrane and Advanced Platelet-Rich Fibrin on the Maxillary Anterior Area

    상악 전치부 3D-티타늄 차폐막과 혈소판농축섬유소를 적용한 골유도재생술의 임상적 평가

    Na-Yeon Lee†, Mi-Seon Goh1,†, Yang-Hun Jung, Jung-Jin Lee, Jae-Min Seo, Jeong-Ho Yun*

    이나연†, 고미선†, 정양훈, 이정진, 서재민, 윤정호*

    The aim of the current study was to evaluate the results of horizontal guided bone regeneration (GBR) with xenograft (deproteinized bovine bone ... + READ MORE
    The aim of the current study was to evaluate the results of horizontal guided bone regeneration (GBR) with xenograft (deproteinized bovine bone mineral, DBBM), allograft (irradiated allogenic cancellous bone and marrow), titanium membrane, resorbable collagen membrane, and advanced platelet-rich fibrin (A-PRF) in the anterior maxilla. The titanium membrane was used in this study has a three-dimensional (3D) shape that can cover ridge defects. Case 1. A 32-year-old female patient presented with discomfort due to mobility and pus discharge on tooth #11. Three months after extracting tooth #11, diagnostic software (R2 GATE diagnostic software, Megagen, Korea) was used to establish the treatment plan for implant placement. At the first stage of implant surgery, GBR for horizontal augmentation was performed with DBBM (Bio-Oss®, Geistlich, Switzerland), irradiated allogenic cancellous bone and marrow (ICB cancellous®, Rocky Mountain Tissue Bank, USA), 3D-titanium membrane (i-Gen®, Megagen, Korea), resorbable collagen membrane (Collagen membrane®, Genoss, Korea), and A-PRF because there was approximately 4 mm labial dehiscence after implant placement. Five months after placing the implant, the second stage of implant surgery was performed, and healing abutment was connected after removal of the 3D-titanium membrane. Five months after the second stage of implant surgery was done, the final prosthesis was then delivered. Case 2. A 35-year-old female patient presented with discomfort due to pain and mobility of implant #21. Removal of implant #21 fixture was planned simultaneously with placement of the new implant fixture. At the first stage of implant surgery, GBR for horizontal augmentation was performed with DBBM (Bio-Oss®), irradiated allogenic cancellous bone and marrow (ICB cancellous®), 3D-titanium membrane (i-Gen®), resorbable collagen membrane (Ossix plus®, Datum, Israel), and A-PRF because there was approximately 7 mm labial dehiscence after implant placement. At the second stage of implant surgery six months after implant placement, healing abutment was connected after removing the 3D-titanium membrane. Nine months after the second stage of implant surgery was done, the final prosthesis was then delivered. In these two clinical cases, wound healing of the operation sites was uneventful. All implants were clinically stable without inflammation or additional bone loss, and there was no discomfort to the patient. With the non-resorbable titanium membrane, the ability of bone formation in the space was stably maintained in three dimensions, and A-PRF might influence soft tissue healing. This limited study suggests that aesthetic results can be achieved with GBR using 3D-titanium membrane and A-PRF in the anterior maxilla. However, long-term follow-up evaluation should be performed. - COLLAPSE
    December 2018