• Original Article

    Directional Prosthesis–Implant Geometry as a Correlate of Eccentric Load Sensitivity Across Axial Inclination–Driven Access-Hole Positions: A Finite Element Analysis
    Young K. Kim, Jermaine Eow, Dung Dinh Luong
    Purpose: To evaluate the associations of axial inclination–driven access-hole position and directional prosthesis–implant geometry with peri-implant biomechanics under eccentric loading, and to … + READ MORE
    Purpose: To evaluate the associations of axial inclination–driven access-hole position and directional prosthesis–implant geometry with peri-implant biomechanics under eccentric loading, and to assess the prosthesis–implant arch area ratio (PIAAR) as a geometric index of eccentric load sensitivity.Materials and Methods: Standardized 3D finite element models of a posterior molar implant restoration were constructed to isolate geometric effects. Using controlled axial inclination while maintaining a fixed prosthetic reference, the access-hole position was altered. Directional geometry was quantified using sectorial PIAAR derived from occlusal projections. Models were evaluated under centric axial and 30-degree oblique loading.Results: Despite a lower aggregate loading magnitude, the localized oblique loading configuration was associated with greater peri-implant stress, which indicated that the interface stress response was not proportional to nominal load magnitude alone but was substantially influenced by load directionality. Higher weakest-direction PIAAR values were consistently associated with greater eccentric stress amplification and greater absolute eccentric stress difference, whereas greater directional spread showed an inverse relationship with both measures. However, this global measure does not establish whether sector-specific stress vulnerability was correspondingly reduced or absent.Conclusion: Eccentric load sensitivity varied with directionally limiting prosthesis–implant geometry, which suggests that conventional access-hole centricity may incompletely characterize the modeled biomechanical behavior. PIAAR may provide a geometric index for defining directional prosthesis–implant relationships under non-axial loading. - COLLAPSE
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    30 September 2026

  • Original Article

    Stability of Immediately Placed Single Molar Implants: A Comparison of Damping Capacity and Resonance Frequency Analysis
    Seung-Hoon Cha, Kwan-Soo Park, Jae-An Park, Young-Min Kim, Won-Suk Jo, Hye-Ran Choi
    Purpose: This study aimed to compare implant stability measured by resonance frequency analysis (RFA) and damping capacity analysis (DCA) at implant placement … + READ MORE
    Purpose: This study aimed to compare implant stability measured by resonance frequency analysis (RFA) and damping capacity analysis (DCA) at implant placement and prosthetic impression taking in patients who underwent immediate implant placement following molar extraction.Materials and Methods: From 2020 to 2022, 45 patients (52 implants) who underwent immediate single-implant placement after molar extraction using a flapless technique at Inje University Sanggye Paik Hospital were evaluated. Implant stability was assessed at implant placement and prosthetic impression taking, using Osstell ISQ (RFA) and AnyCheck (DCA) to obtain implant stability quotient (ISQ) and implant stability test (IST) values, respectively. Linear regression and Bland–Altman analyses were performed to evaluate the relationship and agreement between the two measurement approaches.Results: All implants were clinically successful without complications during the follow-up period. Both ISQ and IST values increased significantly from implant placement to prosthetic impression taking (ISQ: 76.0 ± 6.8 to 81.8 ± 5.2; IST: 77.6 ± 6.0 to 82.5 ± 3.7; both p < .001), with large effect sizes (Cohen’s d = 1.09 and 0.75, respectively). A positive linear association was observed between ISQ and IST values at both time points. Categorical agreement increased from 69.2% at implant placement to 92.3% at prosthetic impression taking. Bland–Altman analysis showed mean biases of ‒1.54 and ‒0.65 at implant placement and prosthetic impression taking, respectively, neither of which was statistically significant, with the 95% limits of agreement narrowing over time.Conclusion: Both Osstell ISQ and AnyCheck demonstrated increasing implant stability over time, with improved agreement as osseointegration progressed. The two devices provided consistent and clinically comparable measurements, suggesting that AnyCheck, like Osstell ISQ, may reliably assess implant stability once osseointegration is established, thereby offering clinicians a broader range of diagnostic options. - COLLAPSE
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    30 September 2026

  • Clinical or Case Report

    Simultaneous Implant Placement with Surgical Management of Adjacent Compromised Sites: Case Reports with 3-Year Follow-Up
    Seung-Ju Lee, Young-Chang Ko, Ki-Tae Koo, Yong-Moo Lee, Dongseob Lee, Jungwon Lee
    Compromised sites due to periodontal or peri-implant disease adjacent to a planned implant site may increase the risk of peri-implant disease and … + READ MORE
    Compromised sites due to periodontal or peri-implant disease adjacent to a planned implant site may increase the risk of peri-implant disease and complicate implant therapy. Conventional management generally involves staged treatment, in which the adjacent periodontal or peri-implant lesion is treated before implant placement, resulting in additional surgical procedures and a prolonged treatment period. This report presents two cases in which implant placement was performed simultaneously with the surgical treatment of compromised adjacent sites. In the first case, an implant was placed adjacent to a tooth with a residual periodontal intrabony defect following non-surgical periodontal therapy. In the second case, an implant was placed adjacent to the existing implant affected by peri-implantitis. Following flap elevation, thorough debridement of the adjacent lesions and implant placement were performed, and the defects were grafted with collagenated deproteinized bovine bone mineral. Prosthetic rehabilitation was completed after a 5-month healing period. At the 3-year follow-up, both patients demonstrated stable peri-implant conditions without signs of inflammation or progressive bone loss. Radiographic bone fill was observed at the treated adjacent sites, while the newly placed implants remained functionally stable. Within the limitations of these two cases, simultaneous implant placement and surgical treatment of adjacent periodontal or peri-implant lesions may represent a feasible treatment strategy for selected patients. - COLLAPSE
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    30 September 2026

  • Clinical or Case Report

    Immediate Anterior Implant Rehabilitation in a Patient with Bruxism: A Case Report
    Minseo Kim, Hyeonjong Lee
    This case report describes staged implant-supported rehabilitation of a dislodged tooth-supported 3-unit fixed dental prosthesis (FDP) in the maxillary anterior region of … + READ MORE
    This case report describes staged implant-supported rehabilitation of a dislodged tooth-supported 3-unit fixed dental prosthesis (FDP) in the maxillary anterior region of a 53-year-old man with bruxism. Both abutment teeth were deemed non-restorable, and considering the patient's deep overbite, immediate implant placement was planned at both sites. Following atraumatic extraction, two implants were immediately placed with simultaneous guided bone regeneration using a surgical guide. The following day, a polymethyl methacrylate (PMMA) interim 3-unit FDP and a maxillary hard occlusal stabilization splint were delivered. After 6 months, a second PMMA interim restoration was used for progressive emergence-profile development, and the final impression was made using a customized impression coping derived from the second interim restoration. The definitive restoration consisted of a screw-and-cement-retained monolithic zirconia 3-unit FDP supported by customized titanium abutments, with the occlusion adjusted according to the implant-protective occlusion (IPO) principle. At the 2-month follow-up, peri-implant tissue remained stable, with no prosthetic complications. In patients with bruxism, an integrated approach combining immediate implant placement and temporization, staged temporization, customized impression coping, IPO, and early occlusal splint therapy may support predictive outcomes in anterior implant rehabilitation. - COLLAPSE
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    30 September 2026

  • Clinical or Case Report

    Immediate Provisional Prosthetic Components for Maintaining Anterior Soft Tissue Contours Following Tooth Extraction: Two Case Reports
    Seri Kim, Yuseung Yi, Kwantae Noh, Ahran Pae, Hyeong-Seob Kim, Kung-Rock Kwon, Seoung-Jin Hong
    Post-extraction soft tissue collapse can compromise esthetic outcomes in anterior prosthetic restorations. This report describes two cases in which immediate provisional prosthetic … + READ MORE
    Post-extraction soft tissue collapse can compromise esthetic outcomes in anterior prosthetic restorations. This report describes two cases in which immediate provisional prosthetic components were used to support post-extraction soft tissue contours and transfer the established contours to definitive prostheses. In the first case, immediate implant placement was performed in the maxillary left central incisor region, and a customized healing abutment and provisional implant-supported prosthesis were used to shape the peri-implant soft tissue contour. In the second case, a provisional fixed dental prosthesis with an ovate pontic was delivered immediately after extraction of the maxillary right central incisor. In both cases, software-based superimposition (Exocad) demonstrated relatively maintained labial soft tissue contours after delivery of the definitive zirconia prostheses. Within the limitations of these cases, immediate provisional prosthetic components may be useful for maintaining anterior soft tissue contours following tooth extraction. - COLLAPSE
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    30 September 2026

  • Clinical or Case Report

    Severe Implant-Related Maxillofacial Infection Associated with Citrobacter Species: A Case Report
    Hyunmi Jo, Mikyung Gong, Jun-Young Kim
    This is a rare case of severe dental implant-related maxillofacial infection associated with Citrobacter spp. in the right submandibular space. An 85-year-old … + READ MORE
    This is a rare case of severe dental implant-related maxillofacial infection associated with Citrobacter spp. in the right submandibular space. An 85-year-old woman presented with facial swelling, extensive skin necrosis, and purulent discharge from a cutaneous fistula in the right mandibular region. Contrast-enhanced computed tomography revealed fenestration of the right mandibular lingual plate by a dental implant, with diffuse swelling and abscess formation in the submandibular space. The patient was immediately admitted, and empirical intravenous antibiotic therapy with cefoxitin (1 g t.i.d.) and metronidazole (500 mg t.i.d.) was initiated. Pus cultures identified Streptococcus constellatus, Citrobacter braakii, and C. freundii. Based on antimicrobial susceptibility testing, the antibiotic therapy was adjusted to ampicillin/sulbactam (3 g q.i.d.) and ciprofloxacin (400 mg b.i.d.). The patient improved significantly and was discharged on hospital day 7. The dental implant was removed under local anesthesia 3 d later and the infection continued to improve. This case highlights the rare involvement of Citrobacter spp. in implant-related maxillofacial infections and importance of microbial identification and susceptibility-guided antibiotic therapy in managing severe polymicrobial infections. - COLLAPSE
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    30 September 2026
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