• Original Article

    Evaluation of Linear and Volumetric Changes in Bone Grafts after Sinus Floor Elevation using a Lateral Approach
    Yeon-Jae Lee, Sung-Jo Lee
    Purpose: The purpose of this study was to analyze the volume, height, and mesiodistal length of the bone graft material after maxillary … + READ MORE
    Purpose: The purpose of this study was to analyze the volume, height, and mesiodistal length of the bone graft material after maxillary sinus elevation using the lateral approach by performing virtual three-dimensional (3D) reconstruction of the bone graft.Materials and Methods: Eleven patients underwent maxillary sinus elevation using the lateral approach in 11 cases. In all patients, deproteinized bovine bone mineral (DBBM) was used as the bone graft material, and the window formed on the side wall of the maxillary sinus was covered with a collagen membrane. Immediately after surgery (T1) and an average of 5.81 ± 1.40 months after surgery (T2), CBCT was taken and the absorption volume, height, and mesio-distal width of the graft material were measured at two time points. At T1 and T2, the average bone graft material volumes were 3,864 ± 698 mm³ and 2,878 ± 350 mm³, respectively.Results: The volume of the bone graft material decreased by an average of 21.8%, showing a statistically significant difference. The average height of the bonegraft material was measured to be 14.4 ± 2.83 mm in T1 and 13.19 ± 1.47 mm in T2 , but it was not statistically significant. After maxillary sinus elevation using the lateral approach, the volume of grafted bone decreases over time. The rate of absorption of the bone graft material at an average of 5.81 months after surgery was measured to be 21.8%. Conclusion: There was no significant decrease in the height of the bone graft material at an average of six months after surgery. These results indicate that DBBM is a reliable and predictable material for maxillary sinus elevation. - COLLAPSE
    30 June 2022
  • Original Article

    Effect of Indented Structures on the Retention of Cement-Retained Implant-Supported Crowns by Provisional Cement
    Jung-Hoon Choi, Seong-Joo Heo, Jai-Young Koak, Seong-Kyun Kim, Ji-Man Park, Jin-Soo Ahn
    Purpose: The objective of this study was to investigate the effect of indented structures, such as dimples and retention groove formations, on … + READ MORE
    Purpose: The objective of this study was to investigate the effect of indented structures, such as dimples and retention groove formations, on the retention of titanium abutment walls when cementing cobalt-chromium (Co-Cr) alloy crowns with zinc oxide-eugenol cement. Materials and Methods: Forty-eight titanium abutments (n = 6) were prepared, of which 24 abutments were 4.0 mm and the other 24 were 6.0 mm in height. These 4.0 mm and 6.0 mm abutments were organized into eight groups: no-dimple, 2-dimple, 4-dimple, and axial retention groove groups. The position and dimensions of the dimples and axial retention grooves were the same for all prepared abutments. Laser-sintered cobalt-chromium (Co-Cr) alloy crowns were cemented using a provisional cement. After thermocycling, a retention test was performed using a universal testing machine. Statistical analysis was performed using the nonparametric Kruskal–Wallis test and post-hoc Mann–Whitney U test (𝛼= .05) to compare the mean retentive force.Results: The lowest retentive force recorded was from the 4.0 mm no-dimple group (112.03 ± 20.30). Forming dimples and retention grooves increased the retentive force for the 4.0 mm groups, but the difference was not statistically significant (p > .05). A statistically significant difference was displayed by the 6.0 mm abutment with the 4-dimple group compared to the 6.0 mm no-dimple group (p < .05).Conclusion: Within the limitations of this in vitro study, the mean retentive force was higher with dimples and axial retention grooves for 4.0 mm titanium abutments but was statistically insignificant (p > .05). An increase in abutment height was statistically correlated with an increase in retentive force within the same number of dimple-groups (p < .05). - COLLAPSE
    30 June 2022
  • Original Article

    Complications of Teeth and Implants Adjacent to Canine Implants: A Retrospective Study
    Bo-Ah Lee, Joon-Ho Yoon, Young-Taek Kim
    Purpose: This study aimed to investigate the prevalence of complications in adjacent teeth and implants when the occlusal scheme changed from canine … + READ MORE
    Purpose: This study aimed to investigate the prevalence of complications in adjacent teeth and implants when the occlusal scheme changed from canine guidance to group function due to implant placement in canine sites and to compare them according to prosthesis type.Materials and Methods: This study included 41 patients, in whom 52 implants were placed at canine sites by the same clinician. The biological and prosthetic complications of canine implants, adjacent teeth, and implants were recorded. Fractures or mobility due to the traumatic force of occlusion in adjacent teeth were also recorded. The implants were divided into three groups according to the prosthesis type: (1) single crown (SC); (2) fixed partial denture splinted with anterior implants (SA); and (3) fixed partial denture splinted with posterior implants (SP). The prevalence of complications was compared between the three groups using the chi-square test.Results: Nine implants were restored with a single crown, 26 implants were splinted with anterior implants, and 17 were splinted with posterior implants. The prevalence of complications in canine implants was not significantly different between the three groups. Fracture of the adjacent teeth and biological complications of the adjacent implants occurred only in the SP group.Conclusion: The results of this study suggest that changes in the occlusion scheme due to canine implants can affect adjacent teeth and implants. Canine implants splinted with posterior implants could be more harmful than single and canine implants splinted with anterior implants. - COLLAPSE
    30 June 2022
  • Clinical or Case Report

    Tooth-implant-supported Double-crown-retained Removable Denture in a Patient with Cleft Palate: A Case Report
    Junhyub Park, Du-Hyeong Lee
    A 35-year-old man with left unilateral cleft palate visited our hospital for prosthetic treatment. After the existing maxillary 10-unit fixed prosthesis was … + READ MORE
    A 35-year-old man with left unilateral cleft palate visited our hospital for prosthetic treatment. After the existing maxillary 10-unit fixed prosthesis was removed, the severely carious teeth were extracted, and the remaining teeth were re-evaluated. Because the periodontal support of the anterior teeth was insufficient due to severe alveolar bone resorption, two additional implants were placed in the positions of the right and left canines, and a tooth-implant-supported hybrid telescopic double-crown-retained denture with friction pins was fabricated as the definitive prosthesis. Although the opposing dental arch comprised natural teeth and fixed prostheses, the patient adapted well to the new prosthesis and was satisfied with its function, esthetics, and ease of maintenance. - COLLAPSE
    30 June 2022
  • Clinical or Case Report

    Long-term Prognosis of Guided Implant Placement After Ridge Preservation using Platelet-rich Fibrin Membrane: A Case Report
    Jin-Un Yoon, Eun-Young Kwon, Ji-Young Joo, Ju-Youn Lee, Hyun-Joo Kim
    In the case of tooth extraction due to severe alveolar bone resorption, extensive bone grafting is often required, making implant treatment difficult … + READ MORE
    In the case of tooth extraction due to severe alveolar bone resorption, extensive bone grafting is often required, making implant treatment difficult and increasing the overall treatment time. We report the long-term prognosis of two cases in which these issues were successfully resolved. To reduce the treatment period and difficulty of the procedure, we performed ridge preservation using xenograft materials and platelet-rich fibrin membranes at the time of extraction. After approximately 3 months, we performed implantation using guided implant surgery. This procedure allowed us to shorten the overall treatment period and place the implant in the ideal location with adequate torque, without extensive bone grafting. Furthermore, implants placed using this procedure showed a stable clinical and radiographic prognosis for more than 6 years. - COLLAPSE
    30 June 2022
  • Clinical or Case Report

    Membrane Fixation using Healing Abutment during Guided Bone Regeneration: A Report of Two Cases
    Taek Kyun Kwon, Young Hoon Kang, Jun Ho Byun
    Guided bone regeneration, a dental surgical procedure, is used to promote growth of the alveolar hard tissue for bone defect with the … + READ MORE
    Guided bone regeneration, a dental surgical procedure, is used to promote growth of the alveolar hard tissue for bone defect with the help of membranes and other barrier techniques. The membrane fixation technique plays a significant role in the success of the bone graft. Several methods have been proposed for membrane fixation, such as the use of a holding suture and a tag pin. However, there are certain disadvantages as the procedures are cumbersome and often a secondary procedure is required. In this case report, we describe a simple method of membrane fixation using a healing abutments during guided bone regeneration, along with implant placement at the bone level. - COLLAPSE
    30 June 2022
  • Clinical or Case Report

    Oral Rehabilitation in An Adult Patient with Oligodontia with Retained Deciduous Teeth by Immediate Implant Placement
    Chang-Hee Han, Seung-Geun Ahn, Jae-Hoon Park, Kyoung-A Kim, Jae-Min Seo
    In the treatment of patients with oligodontia, factors such as patient age, developmental stage, and number of missing teeth should be considered. … + READ MORE
    In the treatment of patients with oligodontia, factors such as patient age, developmental stage, and number of missing teeth should be considered. If the number of missing teeth is less, the patient can be treated with minimally invasive treatments, such as remaining primary teeth, autogenous tooth transplantation, and orthodontic treatment. However, when the number of missing teeth is high, conventional treatment may be limited. In this case, after extraction of the deciduous teeth, implants can be placed in the edentulous area. We report a case of oral rehabilitation with orthodontic treatment, bilateral sinus floor augmentation, and immediate implant placement in a 20-year-old man with oligodontia. The treatment was succesful, and we achieved esthetically and functionally satisfactory outcomes. - COLLAPSE
    30 June 2022
  • Notice

    Erratum to: A Narrative Review of Contemporary Evaluation Methods for Root Analog Implants
    Jungwon Lee, Yang-Jo Seol, Yong-Moo Lee, Ki-Tae Koo
    This errata is described in the article [Vol. 26, No. 1] Change the affiliation of “A Narrative Review of Contemporary Evaluation Methods … + READ MORE
    This errata is described in the article [Vol. 26, No. 1] Change the affiliation of “A Narrative Review of Contemporary Evaluation Methods for Root Analog Implants”. - COLLAPSE
    30 June 2022