• Original Article

    Histologic Analysis of Ridge Preservation Using Deproteinized Porcine Bone: A Retrospective Human Study
    Park, Eun-Sik1, Park, Jeong-Cheol2, Choi, Seong-Ho3 and Lee, Dong-Woon4*
    Purpose: In this retrospective study a histomorphometric analysis was conducted of sites where alveolar ridge preservation was performed using deproteinized porcine bone ... + READ MORE
    Purpose: In this retrospective study a histomorphometric analysis was conducted of sites where alveolar ridge preservation was performed using deproteinized porcine bone mineral.Materials and Methods: Twenty-five patients who underwent ridge preservation after extraction were selected in this study. Histomorphometric analysis was performed according to the healing period (24 weeks) and socket location. The proportions of new bone, residual bone graft material, and fibrovascular tissue were calculated. The demographic characteristics of the two groups were compared using the t-test for continuous variables.Results: The healing duration groups showed no significant differences between the proportions of new bone (p = .692), residual graft (p = .875), and fibrovascular tissue (p = .619). The non-molar and molar area groups showed no significant differences between the proportions of new bone (p = .999), residual graft (p = .638), and fibrovascular tissue (p = .723). The maxilla and mandible groups showed no significant differences between the proportions of new bone (p = .185), residual graft (p = .736), and fibrovascular tissue (p = .125).Conclusion: No significant differences were observed between the results of the histomorphometric analysis of the two groups based on the healing duration and location. - COLLAPSE
    March 2021
  • Original Article

    Bone Regeneration Using Collagenated Synthetic Bone Graft Attached to Collagen Membrane with 3, 4-dihydroxy-L-phenylalanine (DOPA)
    Hong, Inpyo1**, Dolgorsuren, Renchindorj2**, Jeon, Su-Hee1, Song, Young Woo3, Cha, Jae-Kook4, Lee, Jung-Seok5, Paik, Jeong-Won6 and Choi, Seong-Ho7*
    Purpose: The stability of graft material and membrane is crucial for successful guided bone regeneration. As 3,4-dihydroxy-L-phenylalanine (DOPA) is known to ... + READ MORE
    Purpose: The stability of graft material and membrane is crucial for successful guided bone regeneration. As 3,4-dihydroxy-L-phenylalanine (DOPA) is known to contribute to the adhesiveness of natural mussel adhesive proteins, the aim of this study was to evaluate the biocompatibility and bone regeneration using collagenated synthetic bone graft attached to the collagen membrane with DOPA in the rabbit calvaria model.Materials and Methods: Four circular bone defects of 8 mm diameter were created in the rabbit calvarium. Each defect in the calvarium was randomly allocated to 1) sham control group, 2) bone graft using a particle-type synthetic bone substitute (OP) group, 3) bone graft using collagenated synthetic bone block (OC) group, or 4) bone graft using the collagenated synthetic bone graft attached to collagen membrane with DOPA (OC-DOPA) group. A total of 10 rabbits were sacrifced at either 2 or 8 weeks post-surgery.Results: During histometric analysis, new bone formation in the OC-DOPA group was signifcantly greater than that in sham control at 8 weeks. On the contrary, there was no statistically signifcant difference in new bone area (NBA) between OC-DOPA and OC. Histologic analysis revealed infltrations of infammatory cells in the OP, OC, and OC-DOPA groups at 2 weeks. At 8 weeks, there were no remarkable infammatory cells in the OP and OC groups. However, multinucleated giant cells (MNGC) were observed till 8 weeks in the OC-DOPA group.Conclusion: The collagenated synthetic bone graft attached to the collagen membrane using DOPA showed its potential for guided bone regeneration. However, MNGC were observed until the late healing period. - COLLAPSE
    March 2021
  • Clinical or Case Report

    Vertical Ridge Augmentation with Mandibular Ramus Block Bone for Implant Surgery
    Chee, Youngdeok1*
    Vertical alveolar bone loss can occur over a long period after tooth loss. When the amount of alveolar bone is insufficient, installing ... + READ MORE
    Vertical alveolar bone loss can occur over a long period after tooth loss. When the amount of alveolar bone is insufficient, installing implants of appropriate length becomes difficult. To solve this problem, guided bone regeneration, ridge splitting, alveolar bone distraction osteogenesis, and autogenous onlay block bone graft are used. With these methods, the foundation for implantation is properly formed. The purpose of this study was to establish implants using autogenous block bone grafts taken from the same site in the vertically atrophied mandibular alveolar bone. Block bones were harvested from the same sites, and the surgical site was reduced to one place, which reduced post-operation complications leading to rapid healing. Compared to guided bone regeneration, the block bone graft is well maintained so that implant surgery can be performed adequately. It can be applied in various situations and cases because it is selected depending on the amount of bone required for grafting. - COLLAPSE
    March 2021
  • Clinical or Case Report

    Implant-supported Full Mouth Rehabilitation Using Customized Non-precious Metal Casting Abutments: A Case Report
    Kim, Seulgi1 and Lee, Jae-In2*
    When treating an edentulous patient, it is difficult to rehabilitate and maintain long-term functionality with an implant-supported fixed prosthesis. This is because ... + READ MORE
    When treating an edentulous patient, it is difficult to rehabilitate and maintain long-term functionality with an implant-supported fixed prosthesis. This is because resorption of the remaining alveolar bone may cause dissonance with the opposite arch. We present a case involving customized abutments made using a conventional casting system with cobalt-chromium (Co-Cr) alloy, used to compensate for the shortcomings of prefabricated abutments. The customized abutment, used in conjunction with a cement-retained prosthesis, has shown satisfying result in both function and aesthetics during an eight-year follow-up of this particular patient. - COLLAPSE
    March 2021
  • Clinical or Case Report

    Occlusal Overload May Affect the Recovery of Peri-implant Bone: A Report of Two Cases
    Ji, Jung-Gu1, Yoo, Mi-Kyung2, Choi, Seong-Ho3 and Lee, Dong-Woon4*
    Peri-implantitis is an inflammatory process involving the soft and hard tissues around an osseointegrated implant, characterized by bleeding, suppuration, pocket formation, and ... + READ MORE
    Peri-implantitis is an inflammatory process involving the soft and hard tissues around an osseointegrated implant, characterized by bleeding, suppuration, pocket formation, and loss of supporting bone. The relationship between the resorption of the peri-implant supporting bone and traumatic occlusal forces remains unclear. We reviewed two cases of successful peri-implant bone recovery with improved clinical parameters after non-surgical and prosthetic treatment. This study demonstrates that long-term success of dental implants requires a multidisciplinary approach, including periodontal evaluation, maintenance of adequate oral hygiene, prosthodontic assessment, and optimal occlusion free from occlusal interferences and overload. - COLLAPSE
    March 2021