• Original Article

    Minimal Electrocautery as an Alternative Approach for Implant Removal: A Preliminary Animal Study
    Bo-Ah Lee, Sung-Ho Lee, Min-Sun Lee, Ho-Kyung Lim, Sang-Hoon Kang
    Purpose: This study aimed to introduce electrocautery for failed implant fixtures removal and to compare the results of this technique according to ... + READ MORE
    Purpose: This study aimed to introduce electrocautery for failed implant fixtures removal and to compare the results of this technique according to electrocautery time.Materials and Methods: Implants were placed in the femoral condyle of 12-week-old male New Zealand white rabbits. Five implants in three rabbits were used as the experimental group, and two implants in one rabbit were used as the control group. Six weeks later, electrocautery was performed at 30 W for 10 sec and 15 sec in the experimental group, whereas electrocautery was not performed in the control group. One week later, the implants were removed by hand wrench, and histological analysis was performed.Results: At six weeks af ter implant placement, histological analysis confirmed osseointegration of the fixtures. As a result of electrocautery, the removal torque of implant fixtures was reduced, and osseointegration broke down. There was no difference in the histologic images of the specimens af ter removal of the fixture between the experimental and control groups.Conclusion: This study showed that minimal electrocautery with low output for a short time can be utilized for implant removal with minimal damage to the surrounding bone. - COLLAPSE
    September 2021
  • Original Article

    The Measurement of Dimensional Ridge Contour Changes after Tooth Extraction Using Intraoral Scanner: A Clinical Pilot Study
    Yun-Jeong Kim, Mi Young Lee, Jang-Hyun Kim, Ji-Man Park, Young Ku
    Purpose: This study aimed to identif y the trend of horizontal sof t tissue contour changes in extraction sockets using data obtained ... + READ MORE
    Purpose: This study aimed to identif y the trend of horizontal sof t tissue contour changes in extraction sockets using data obtained by intraoral scanners, and to investigate the effect of ridge preservation.Materials and Methods: In nine patients, 18 teeth were extracted, including both premolars, and ridge preservation with deproteinized bovine bone mineral and an absorbable collagen membrane was performed on only one side, and a linear change in width was observed. Intraoral scanning was performed immediately before extraction and at 30- and 90 days af ter extraction. Superimposition and measurements of the three-dimensional scan images were performed.Results: In the experimental group, a decrease in the horizontal width of 0.845 mm buccally and 0.307 mm lingually at 4 mm below the baseline was observed 90 days af ter tooth extraction, and in the control group, an average decrease of 0.73 mm and 0.21 mm was observed, respectively. The vertical decrease in gingival height measured 90 days af ter tooth extraction was 0.8 mm in the experimental group and 0.46 mm in the control group.Conclusion: The horizontal ridge contour during the healing process of healthy mandibular premolar tooth extraction showed a tendency to decrease over time, and a greater change was observed as the height of the measurement point was closer to the reference gingival margin. The effects of ridge preservation were not evident. - COLLAPSE
    September 2021
  • Clinical or Case Report

    Alveolar Bone Preservation Using an Orthodontic Mini-implant in an Adolescent Patient with Multiple Missing Teeth
    Bum-Jun Lee, Young-Taek Kim, Jin-Joo Yoo, Ji-Yeon Lee
    Af ter tooth extraction, the alveolar ridge undergoes a series of structural changes, including the inevitable vertical and horizontal loss of alveolar ... + READ MORE
    Af ter tooth extraction, the alveolar ridge undergoes a series of structural changes, including the inevitable vertical and horizontal loss of alveolar bone. In this case, growth modif ication was performed on an 11-year-old patient with skeletal Class II malocclusion with multiple congenitally missing teeth and early loss of a deciduous tooth without succedaneous replacement using an intraoral orthopedic appliance. The space f rom the lost deciduous teeth was effectively maintained. At the age of 14 years, an orthodontic mini-implant with a diameter and length of 1.6 and 7 mm, respectively, was inserted into the alveolar bone to prevent additional alveolar bone resorption and maintain alveolar bone height until growth completion. At the age of 18 years, the second phase of orthodontic treatment was started to properly set the time of dental implant placement and the completion of orthodontic treatment. At the age of 19 years, the alveolar bone height was properly maintained until dental implant placement. The dental implant was successf ully placed without additional vertical bone augmentation. Therefore, we successf ully preserved the alveolar bone by inserting an orthodontic mini-implant into the site of early deciduous tooth loss without succedaneous replacement in an adolescent patient. - COLLAPSE
    September 2021
  • Clinical or Case Report

    Severe Maxillofacial Infection After Implant Crown Recementation: A Case Report
    Sung-Ouk Kim, Kwan-Soo Park
    Maxillofacial infections f rom odontogenic or non-odontogenic causes can extend to the fascial space, a potential space formed by the fascia. Although ... + READ MORE
    Maxillofacial infections f rom odontogenic or non-odontogenic causes can extend to the fascial space, a potential space formed by the fascia. Although morbidity due to infection has been considerably reduced because of modern antibiotic therapy, it can be life-threatening when the infection invades the deep fascial space. There are various causes of infection in the maxillofacial region, mostly following odontogenic or invasive dental treatments. We report a case of severe infection of the fascial spaces and deep neck af ter non-invasive dental treatment involving recementation of the implant crown in a male in his 60s, with reporting on its causes and treatment options. - COLLAPSE
    September 2021
  • Dental Technique

    Modeling Compound to Rigidly Seal the Occlusal Window on Open Trays for Multiunit Implant Impression
    Jin-Joo Yoo, Joon-Ho Yoon
    Despite digitalization in dentistry, conventional impression techniques are still generally used for fabricating multi-unit implant prostheses. Among these techniques, the open-tray impression ... + READ MORE
    Despite digitalization in dentistry, conventional impression techniques are still generally used for fabricating multi-unit implant prostheses. Among these techniques, the open-tray impression technique is known to be accurate. Open trays have occlusal windows to access impression coping, and the space might cause inaccurate impressions due to a lack of supporting structures. This technical report introduces a simple method to rigidly seal the occlusal window on open trays with type II modeling compounds. - COLLAPSE
    September 2021