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    Evaluation of the biomechanical effects and stability of titanium and carbon fiber-reinforced polyetheretherketone mini plates in Le Fort I advancement osteotomy fixation using finite element analysis
    (Elsevier, 2025) Yakut, Kubra; Ciftci, Sezai
    Aim: This study aimed to investigate the biomechanical properties of 60 % carbon fiber-reinforced polyetheretherketone (Cfr-PEEK), which exhibits high mechanical strength and can address the limitations of titanium mini plates used in Le Fort I osteotomy. Material and Method: Models were created using the FEA method based on tomography images of adult individuals. A 5 mm maxillary advancement was applied to the models following Le Fort I osteotomy. Mini plates made of titanium and 60 % Cfr-PEEK were used. Support was provided by the nasomaxillary and zygomaticomaxillary buttresses to fix a total of four l-shaped mini plates. Oblique loads of 125 N, directed from palatal to buccal, and a total of 250 N compression loads were applied to the central fossa of the premolar and molar teeth in the maxillary model at a 30 degrees angle relative to the long axis of the teeth. Displacement values at the osteotomy line, Von Mises stresses in the mini plate-screws, and principal stresses in the bone were compared. Results: Examination of stress values in the fixation systems of the models revealed higher stress values in the Cfr-PEEK model compared to the titanium model. However, these stresses did not reach levels that would deform the Cfr-PEEK fixation systems. Stress and displacement values in the bone were lower in the CfrPEEK model compared to the titanium model. Conclusion: According to the findings of our study, Cfr-PEEK represents a viable alternative to titanium for mini plate material in Le Fort I osteotomy, offering biomechanical advantages. (c) 2024 Elsevier Masson SAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
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    Reconstruction of Oronasal Fistulas with Multiple Techniques: A Case Series Including an Orthodontic Appliance-Induced Defect
    (Springer India, 2026) Ciftci, Sezai; Cetiner, Yunus; Ozden, Samet
    Purpose To assess the effectiveness of various surgical techniques for repairing oronasal fistulas (ONFs) and to present clinical cases utilizing multilayer closure and tongue flap combinations. Materials Four ONF patients underwent different repairs: three-layer closure for an orthodontic appliance-induced fistula, double palatal flap with buccal fat pad for a congenital fistula, anteriorly based tongue flap for a recurrent fistula, and autogenous bone grafting with flap reconstruction for dual fistulas. Results Complete closure was achieved in three patients (75%), with one small asymptomatic residual fistula. No major complications were observed during 6-12 months of follow-up. The appliance-induced fistula appears to be the first reported case linked directly to orthodontic devices. Conclusion ONF repair remains complex, with outcomes influenced by defect size and tissue quality. Local flaps are adequate for small defects, whereas larger or recurrent cases benefit from advanced reconstructive methods. Long-term orthodontic appliance use may increase fistula risk, highlighting the need for close monitoring.
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    Treatment of a class III patient with maxillary retrognathia and amelogenesis imperfecta using a surgery-only orthognathic approach
    (Elsevier, 2025) Ciftci, Sezai; Simsek, Mehmet Sait; Ozden, Samet
    Amelogenesis imperfecta (AI) is a rare disorder characterized by structural irregularities of enamel and may be associated with various oral-craniofacial features. The compromised surface of the teeth creates an unsuitable area for the application of orthodontic appliances. The aim of this study is to present the prosthetic rehabilitation of an 18-year-old male patient diagnosed with amelogenesis imperfecta and skeletal Class III malocclusion due to maxillary retrognathia, following a surgery-only approach (SOA) with virtually planned Le Fort I and bilateral sagittal split ramus osteotomies (BSSRO). (c) 2025 Elsevier Masson SAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.