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오송희,남경연,김성훈,Gerald Nelson 대한영상치의학회 2020 Imaging Science in Dentistry Vol.50 No.1
Purpose: The purpose of this study was to evaluate vertical bone loss and alveolar bone thickness in the maxillary and mandibular incisors of patients with skeletal class III malocclusion. This study also aimed to evaluate the periodontal condition of class III malocclusion patients who had not undergone orthodontic treatment. Materials and Methods: The sample included cone-beam computed tomography scans of 24 Korean subjects (3 male and 21 female). Alveolar bone thickness (ABT), alveolar bone area (ABA), alveolar bone loss (ABL), and fenestration of the maxillary and mandibular incisors were measured using 3-dimensional imaging software. Results: All incisors displayed an ABT of less than 1.0 mm from the labial surface to root level 7 (70% of the root length). A statistically significant difference was observed between the mandibular labial and lingual ABAs and between the maxillary labial and mandibular labial ABAs. The lingual ABA of the mandibular lateral incisors was larger than that of the mandibular central incisors. ABL was severe on the labial surface. A statistically significant difference was observed between the maxillary and mandibular labial ABL values (21.8% and 34.4%, respectively). Mandibular lingual ABL (27.6%) was significantly more severe than maxillary lingual ABL (18.3%) (P<0.05). Eighty-two fenestrations were found on the labial surfaces of the incisors, while only 2 fenestrations were observed on the lingual surfaces. Fenestrations were most commonly observed at root level 6. Conclusion: Careful evaluation is needed before orthodontic treatment to avoid iatrogenic damage of periodontal support when treating patients with class III malocclusion.
Go, Taek-Su,Kim, Seong-Hun,Nelson, Gerald Korean Academy of Dental Science 2011 Journal of korean dental science Vol.4 No.1
Purpose: To describe the newly developed Film image transfer system (FITS) for proper positioning of the orthodontic mini-implant in the narrow interdental space and considerations for better application. Materials and Methods: A patient who was planning to have orthodontic mini-implant treatment on the posterior maxilla was recruited to assess the feasibility of FITS. Dental radiographic film and bite record was taken. And then the film image was transferred on the photographic emulsion coated model using transfer light through film projector (enlarger). After exposing the photo emulsion coating on the model, the image was developed with a working solution for a paper developer and fixed. The surgical guide for the mini-implant was fabricated from the transported FITS data. Results: The completed surgical guide was easily placed intraorally, and allowed a simple and rapid placement of the mini-implant. The site of the implant placement was accurate as planned position. Conclusion: In the reported case, The FITS technique represents an effort to minimize risk to the patient and produce consistently good results based upon accurate information about the anatomy of the implant site.
Hyo-Won Ahn,Kyu-Rhim Chung,Suk-Man Kang,Lu Lin,Gerald Nelson,Seong-Hun Kim 대한치과교정학회 2012 대한치과교정학회지 Vol.42 No.5
In the correction of dental Class III molar relationship in skeletal Class II patients, uprighting of the mandibular posterior segments without opening the mandible is an important treatment objective. In the case reported herein, a C-tube miniplate fixed to the lower labial symphysis and connected with a nickel-titanium reversecurved archwire provided effective uprighting of the lower molars, without the need of orthodontic appliances on the mandibular anteriors. Using this approach, an appropriate magnitude of force is exerted on the molars while avoiding any negative effect on the mandibular anteriors.
Oh, Song Hee,Nahm, Kyung-Yen,Kim, Seong-Hun,Nelson, Gerald Korean Academy of Oral and Maxillofacial Radiology 2020 Imaging Science in Dentistry Vol.50 No.1
Purpose: The purpose of this study was to evaluate vertical bone loss and alveolar bone thickness in the maxillary and mandibular incisors of patients with skeletal class III malocclusion. This study also aimed to evaluate the periodontal condition of class III malocclusion patients who had not undergone orthodontic treatment. Materials and Methods: The sample included cone-beam computed tomography scans of 24 Korean subjects (3 male and 21 female). Alveolar bone thickness (ABT), alveolar bone area (ABA), alveolar bone loss (ABL), and fenestration of the maxillary and mandibular incisors were measured using 3-dimensional imaging software. Results: All incisors displayed an ABT of less than 1.0 mm from the labial surface to root level 7 (70% of the root length). A statistically significant difference was observed between the mandibular labial and lingual ABAs and between the maxillary labial and mandibular labial ABAs. The lingual ABA of the mandibular lateral incisors was larger than that of the mandibular central incisors. ABL was severe on the labial surface. A statistically significant difference was observed between the maxillary and mandibular labial ABL values(21.8% and 34.4%, respectively). Mandibular lingual ABL (27.6%) was significantly more severe than maxillary lingual ABL (18.3%) (P<0.05). Eighty-two fenestrations were found on the labial surfaces of the incisors, while only 2 fenestrations were observed on the lingual surfaces. Fenestrations were most commonly observed at root level 6. Conclusion: Careful evaluation is needed before orthodontic treatment to avoid iatrogenic damage of periodontal support when treating patients with class III malocclusion.
Kim, Kyung A.,Seo, Kyung Won,Kim, Seong-Hun,Chung, Kyu-Rhim,Nelson, Gerald by Mutaz B. Habal, MD. 2014 JOURNAL OF CRANIOFACIAL SURGERY - Vol.25 No.5
INTRODUCTION: This article introduces the modification of 4-miniplate-assisted orthopedic protocol for class III correction. Instead of bilateral mandibular miniplates between lateral incisors and canine, the single modified Y-type C-tube with extension arms can replace 2 miniplates for temporary skeletal anchorage with advantages. METHODS: Y-type C-tube was modified to have 2 extension arms for the application of class III elastics to replace 2 separate miniplates on either side of the mandible. A patient who declined a facemask therapy was selected to receive the modified protocol using only 3 C-tubes for bone-anchored maxillary orthopedic traction. The modified Y-type C-tube was inserted at the mandibular symphysis, and the bifurcation of the extension arms exited the tissue near the mucogingival junction. RESULTS: The modified Y-type C-tube was placed on the mandibular symphysis, and this provided 3 advantages compared with conventional miniplates: (1) 1 C-tube placement warrants less surgical sites than 2-miniplate installation, (2) placing the C-tube in between mandibular incisors prevents damage to developing or erupting permanent canines and allows early treatment start, and (3) the characteristic bendability of extension arms permits easy alteration on position and results in the vertical and sagittal vector controls of class III elastics. When the treatment is finished, it can be also simply removed like any other C-tubes with simple detachment of extension arms. CONCLUSIONS: The modification of 4-miniplate-assisted orthopedic protocol for class III correction provides easier surgical placement of miniplates by minimizing complications, early initiation of treatment, and more vector control with bendable extension arms of the modified Y-type C-tube.
Effects of a new type of clear overlay retainer on occlusal contacts
Kyoung Yeon Kim,Hyo-Won Ahn,Seong-Hun Kim,Gerald Nelson 대한치과교정학회 2017 대한치과교정학회지 Vol.47 No.3
The popularity of clear overlay retainers (CORs) has increased recently because of their advantages such as better esthetics, cost effectiveness, easy fabrication, and good compliance. However, a deficiency in posterior occlusal settling is a reported limitation of CORs. The aim of this study was to evaluate the posterior occlusal contact changes in a new type of clear orthodontic retainer called Oral-treaper (OTP), which consists of three layers and has stronger mechanical characteristics than do conventional retainers. Three patients who completed fixed orthodontic treatment received OTP as a removable retainer. Cast models were fabricated after the removal of fixed appliances (T1) and after 4 to 11 months of using the retainers (T2). We evaluated all the cast models to compare the post-orthodontic settling pattern during the use of the OTPs. The depth of occlusal contacts was evaluated using color maps. The OTP did not prevent vertical settling in all patients but resulted in an improvement in posterior occlusal contact points.
Ahn, Hyo-Won,Chung, Kyu-Rhim,Kang, Suk-Man,Lin, Lu,Nelson, Gerald,Kim, Seong-Hun The Korean Association Of Orthodontists 2012 대한치과교정학회지 Vol.42 No.5
In the correction of dental Class III molar relationship in skeletal Class II patients, uprighting of the mandibular posterior segments without opening the mandible is an important treatment objective. In the case reported herein, a C-tube miniplate fixed to the lower labial symphysis and connected with a nickel-titanium reverse-curved archwire provided effective uprighting of the lower molars, without the need of orthodontic appliances on the mandibular anteriors. Using this approach, an appropriate magnitude of force is exerted on the molars while avoiding any negative effect on the mandibular anteriors.