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Original Article
- Dental Implant Fractures: A Report of 43 Implant Fixtures in 33 Patients
- Sangjun Park, Kang-Min Ahn
- Purpose: Implant-supported restorations have become the standard treatment for edentulous patients. However, several complications have been reported, including implant-fixture fracture. This study …
- Purpose: Implant-supported restorations have become the standard treatment for edentulous patients. However, several complications have been reported, including implant-fixture fracture. This study aimed to determine the risk factors for dental implant-fixture fracture by evaluating 43 fractured implant fixtures in 33 patients. Materials and Methods: This study included patients referred from local clinics owing to implant fracture between 2006 and 2023. The implant type and location, method for removal, and risk factors for implant fracture were investigated.Results: This study included 22 men and 11 women (mean age, 60.8 years; range, 33–82 years). Implant fracture was twice as common in men than in women. Fractures were more common in fixtures with internal connections rather than in those with external connections. More implant fractures were observed in patients with single implants than in those with multiple implants.Conclusion: Since the only solution to implant fracture is removal, regular follow-up and biomechanical and biological considerations to reduce dental implant fracture are necessary. - COLLAPSE
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Original Article
- Implants Removal Due to Abutment or Screw Fracture: Report of 13 Cases
- Tae-Wook Kwak, Kang-Min Ahn
- Purpose: This study aimed to report dental implant removal due to various instances of implant abutment and screw fractures. In this study, …
- Purpose: This study aimed to report dental implant removal due to various instances of implant abutment and screw fractures. In this study, the indications for implant removal due to mechanical failure were documented.Materials and Methods: This study investigated patients referred to the Department of Oral and Maxillofacial Surgery of our hospital for implant removal surgery due to abutment screw fractures between 2010 and 2024. The study included 13 patients with 15 implants. Patient age, sex, implant location, fracture site, and implant system type were investigated. Results: Fifteen implants were removed in 13 patients with abutment and screw fractures. The mean age of the patients was 63.4 years. Moreover, a total of 11 men and two women were included in the analysis. The implants were most commonly placed in the molar region, with a maxilla-to-mandible ratio of 9:6. The screw fracture locations were categorized into the cervical, middle, or apical thirds. Their corresponding numbers were two, eight, and four, respectively. The implant system and manufacturer demonstrated no significant correlation with screw fractures.Conclusion: When a screw fracture occurs in the lower third of a dental implant, removal is often difficult. Regular check-ups and periodic screw tightening are mandatory to prevent severe complications such as screw or abutment fractures. Failed implants should be removed and replaced with new dental implants. - COLLAPSE
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Original Article
- Implant Thread Shape Classification by Placement Site from Dental Panoramic Images Using Deep Neural Networks
- Sujin Yang, Youngjin Choi, Jaeyeon Kim, Ui-Won Jung, Wonse Park
- Purpose: In this study, we aimed to classify an implant system by comparing the types of implant thread shapes shown on radiographs …
- Purpose: In this study, we aimed to classify an implant system by comparing the types of implant thread shapes shown on radiographs using various Convolutional Neural Networks (CNNs), particularly Xception, InceptionV3, ResNet50V2, and ResNet101V2. The accuracy of the CNN based on the implant site was compared.Materials and Methods: A total of 1000 radiographic images, consisting of eight types of implants, were preprocessed by resizing and CLAHE filtering, and then augmented. CNNs were trained and validated for implant thread shape prediction. Grad-CAM was used to visualize class activation maps (CAM) on the implant threads shown within the radiographic image.Results: Averaged over 10 validation folds, each model achieved an AUC of over 0.96: AUC of 0.961 (95% CI 0.952–0.970) with Xception, 0.973 (95% CI 0.966-0.980) with InceptionV3, 0.980 (95% CI 0.974-0.988) with ResNet50V2, and 0.983 (95% CI 0.975-0.992) with ResNet101V2. Accuracy was higher in the posterior region than in the anterior area in all four models. Most CAMs highlighted the implant surface where the threads were present; however, some showed responses in other areas.Conclusion: The CNN models accurately classified implants in all areas of the oral cavity according to the thread shape, using radiographic images. - COLLAPSE
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Original Article
- A Comparison of Scan Data Accuracy of Implant Scan Body and Encoded Healing Abutment
- Ga-Hee Kim, Eun-Jin Park, Young-Eun Cho
- Purpose: The precision of implant prostheses, which requires accurate impression acquisition, can significantly impact a patient’s treatment prognosis. This study therefore aimed …
- Purpose: The precision of implant prostheses, which requires accurate impression acquisition, can significantly impact a patient’s treatment prognosis. This study therefore aimed to compare the accuracy of the scan data obtained using an encoded healing abutment with a scan body for digital implant impressions.Materials and Methods: A resin model was constructed using an implant analog (ISLA500, Neobiotech) at sites #15, #17, and #21. After the scan body was connected to on the model, it underwent scanning using a model scanner to produce reference data. The scan body (IS D5, Neobiotech) and encoded healing abutment (IS 4004S, Neobiotech) were connected to the model, and 20 scans per each group were performed using an intraoral scanner (Trios®, 3Shape Dental Systems). The data obtained from these two groups were compared with the reference data using two-way analysis of variance and t-tests.Results: The mean distance from the reference point was 0.089 mm in the scan body group and 0.217 mm in the encoded healing abutment group, indicating that the scan body was closer to the reference value than the encoded healing abutment.Conclusion: Digital implant impressions obtained with the scan body were more accurate than those acquired with the encoded healing abutment when taking digital implant impressions. - COLLAPSE
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Original Article
- Endosinus Bone Gain after Osteotome Sinus Floor Elevation Without Bone Grafting: A Retrospective Study
- Hye In Keum, Hun Jun Lim
- Purpose: This retrospective study evaluated the radiographic and clinical outcomes of osteotome sinus floor elevation (OSFE) without bone grafts, and analyzed the …
- Purpose: This retrospective study evaluated the radiographic and clinical outcomes of osteotome sinus floor elevation (OSFE) without bone grafts, and analyzed the factors influencing endosinus bone remodeling.Materials and Methods: Radiographic and clinical data from 44 implants in 36 patients were collected after a follow-up period of 6 months to 6.5 years (mean, 2.04 years). Mean residual bone height (RBH) was 5.0 ± 1.3 mm. The length of the implant protruding into the sinus and endosinus bone gain (ESBG) on radiographs were measured.Results: All the 44 implants survived until the final follow-up period. Groups were divided according to an RBH of 5 mm at the time of implant placement, with 22 implants per group. Mean ESBG was 2.40 ± 1.48 mm in an RBH <5 mm group and 2.01 ± 0.87 mm in an RBH ≥5 mm group. Endosinus bone gain was significantly higher in the RBH <5 mm group for up to one year after the implant placement; however, there was no significant difference between the two groups at the final follow-up period.Conclusion: Osteotome sinus floor elevation without bone grafting is a predictable procedure for achieving endosinus bone remodeling when RBH is <5 mm. - COLLAPSE
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Clinical or Case Report
- Esthetic Rehabilitation of A Single-implant Prosthesis Using Software-based Virtual Trial Procedures Encompassing Visual Inspection and Quantitative Evaluation: A Case Report
- Hyeon Chae Kim, Kyung Chul Oh
- Shade selection is essential to achieving good esthetic outcomes of prosthodontic treatment. Visual inspection methods are easily performed but may feature inconsistent …
- Shade selection is essential to achieving good esthetic outcomes of prosthodontic treatment. Visual inspection methods are easily performed but may feature inconsistent outcomes. Digital shade-measuring devices require expert result interpretation and are expensive. In this case report, a practical clinical approach for shade selection was applied. After an impression was obtained, a single implant-supported crown was fabricated on a cast model. Intraoral photograph and the photograph of the cast model with the prosthesis placed upon it were uploaded into the software. The prosthesis part of the cast model photograph was cropped and superimposed over the intraoral photograph, enabling a virtual trial of the prosthesis to predict the expected esthetic outcomes. - COLLAPSE
Journal Informaiton
Journal of implantology and applied sciences
Journal of implantology and applied sciences
The Korean Academy of Oral & Maxillofacial Implantology
대한구강악안면임플란트학회
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Tel: +82-2-558-5966 / Fax: +82-2-558-5965 / E-mail: webmaster@implant.or.kr Copyright© The Korean Academy of Oral & Maxillofacial Implantology. Powered by APUB
Tel: +82-2-558-5966 / Fax: +82-2-558-5965 / E-mail: webmaster@implant.or.kr Copyright© The Korean Academy of Oral & Maxillofacial Implantology. Powered by APUB