The Korean Journal of Orthodontics.2017;47(1):1-2. doi:10.4041/kjod.2017.47.1.1
No abstract available.
The Korean Journal of Orthodontics
1970 to Present ISSN: 2234-7518
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Scar formation and revision after the removal of orthodontic miniscrews.
The Korean Journal of Orthodontics.2015;45(3):146-150. doi:10.4041/kjod.2015.45.3.146
Many clinicians expect complete healing after the removal of temporary anchorage devices, but clinical examination may reveal scar-like tissue. This report presents the typical features of scarring detected after the removal of miniscrews, and the clinical outcome of scar revision along with its pathologic features.
Cicatrix* ; Wound Healing
Cicatrix* ; Wound Healing
The Korean Journal of Orthodontics.2015;45(3):136-145. doi:10.4041/kjod.2015.45.3.136
This case report describes the orthodontic treatment performed for open bite caused by internal derangement (ID) and osteoarthritis (OA) of the temporomandibular joint (TMJ). A Japanese woman, aged 31 years and 11 months, referred to our department by an oral surgeon had an open bite with clockwise rotation of the mandible and degeneration of the condyle. The overbite was corrected through intrusion of the maxillary and mandibular molars using mini-screw implants to induce counterclockwise rotation of the mandible. Then, the mandibular second premolars were extracted and comprehensive orthodontic treatment was performed to establish a Class I molar relationship with distalization of the maxillary arch and to eliminate anterior crowding. Following treatment, her facial profile improved and a functional and stable occlusion was achieved without recurrence of the TMJ symptoms. These results suggest that orthodontic intrusion of the molars is one of the safer and less stressful alternatives for the management of open bite due to degeneration of the condyles caused by ID and OA of TMJ.
Asian Continental Ancestry Group ; Bicuspid ; Crowding ; Female ; Humans ; Mandible ; Molar ; Open Bite* ; Osteoarthritis* ; Overbite ; Recurrence ; Temporomandibular Joint*
Asian Continental Ancestry Group ; Bicuspid ; Crowding ; Female ; Humans ; Mandible ; Molar ; Open Bite* ; Osteoarthritis* ; Overbite ; Recurrence ; Temporomandibular Joint*
Color stability of laboratory glass-fiber-reinforced plastics for esthetic orthodontic wires.
The Korean Journal of Orthodontics.2015;45(3):130-135. doi:10.4041/kjod.2015.45.3.130
OBJECTIVE: In our previous study, glass-fiber-reinforced plastics (GFRPs) made from polycarbonate and glass fibers were prepared for esthetic orthodontic wires using pultrusion. These laboratory GFRP wires are more transparent than the commercially available nickel-titanium wire; however, an investigation of the color stability of GFRP during orthodontic treatment is needed. Accordingly, in the present study, the color stability of GFRP was assessed using colorimetry. METHODS: Preparation of GFRP esthetic round wires (diameter: 0.45 mm [0.018 inch]) using pultrusion was described previously. Here, to investigate how the diameter of fiber reinforcement affects color stability, GFRPs were prepared by incorporating either 13-microm (GFRP-13) or 7-microm glass (GFRP-7) fibers. The color changes of GFRPs after 24 h, and following 1, 2, and 4 weeks of coffee immersion at 37degrees C, were measured by colorimetry. We evaluated the color stability of GFRPs by two evaluating units: the color difference (DeltaE*) and National Bureau of Standards (NBS). RESULTS: After immersion, both GFRPs showed almost no visible color change. According to the colorimetry measurements, the DeltaE* values of GFRP-13 and GFRP-7 were 0.73-1.16, and 0.62-1.10, respectively. In accordance with NBS units, both GFRPs showed "slight" color changes. As a result, there were no significant differences in the DeltaE* values or NBS units for GFRP-13 or GFRP-7. Moreover, for both GFRPs, no significant differences were observed in any of the immersion periods. CONCLUSIONS: Our findings suggest that the GFRPs will maintain high color stability during orthodontic treatment, and are an attractive prospect as esthetic orthodontic wires.
Coffee ; Colorimetry ; Esthetics ; Glass ; Immersion ; Orthodontic Wires* ; Plastics*
Coffee ; Colorimetry ; Esthetics ; Glass ; Immersion ; Orthodontic Wires* ; Plastics*
The Korean Journal of Orthodontics.2015;45(3):121-129. doi:10.4041/kjod.2015.45.3.121
OBJECTIVE: This study aimed to assess three-dimensional changes in the temporomandibular joint positions and mandibular dimensions after correction of dental factors restricting mandibular growth in patients with Class II division 1 or division 2 malocclusion in the pubertal growth period. METHODS: This prospective clinical study included 14 patients each with Class II division 1 (group I) and Class II division 2 (group II) malocclusions. The quad-helix was used for maxillary expansion, while utility arches were used for intrusion (group I) or protrusion and intrusion (group II) of the maxillary incisors. After approximately 2 months of treatment, an adequate maxillary arch width and acceptable maxillary incisor inclination were obtained. The patients were followed for an average of 6 months. Intraoral and extraoral photographs, plaster models, and cone-beam computed tomography (CBCT) images were obtained before and after treatment. Lateral cephalometric and temporomandibular joint measurements were made from the CBCT images. RESULTS: The mandibular dimensions increased in both groups, although mandibular positional changes were also found in group II. There were no differences in the condylar position within the mandibular fossa or the condylar dimensions. The mandibular fossa depth and condylar positions were symmetrical at treatment initiation and completion. CONCLUSIONS: Class II malocclusion can be partially corrected by achieving an ideal maxillary arch form, particularly in patients with Class II division 2 malocclusion. Restrictions of the mandible in the transverse or sagittal plane do not affect the temporomandibular joint positions in these patients because of the high adaptability of this joint.
Cone-Beam Computed Tomography ; Humans ; Incisor ; Joints ; Malocclusion* ; Mandible ; Palatal Expansion Technique ; Prospective Studies ; Temporomandibular Joint*
Cone-Beam Computed Tomography ; Humans ; Incisor ; Joints ; Malocclusion* ; Mandible ; Palatal Expansion Technique ; Prospective Studies ; Temporomandibular Joint*
The Korean Journal of Orthodontics.2015;45(3):113-120. doi:10.4041/kjod.2015.45.3.113
OBJECTIVE: This study compared occlusal contact areas of ideally planned set-up and accomplished final models against the initial in class I and II molar relationships at finishing. METHODS: Evaluations were performed for 41 post-orthodontic treatment cases, of which 22 were clinically diagnosed as class I and the remainder were diagnosed as full cusp class II. Class I cases had four first premolars extracted, while class II cases had maxillary first premolars extracted. Occlusal contact areas were measured using a three-dimensional scanner and RapidForm 2004. Independent t-tests were used to validate comparison values between class I and II finishings. Repeated measures analysis of variance was used to compare initial, set up, and final models. RESULTS: Molars from cases in the class I finishing for the set-up model showed significantly greater contact areas than those from class II finishing (p < 0.05). The final model class I finishing showed significantly larger contact areas for the second molars (p < 0.05). The first molars of the class I finishing for the final model showed a tendency to have larger contact areas than those of class II finishing, although the difference was not statistically significant (p = 0.078). CONCLUSIONS: In set-up models, posterior occlusal contact was better in class I than in class II finishing. In final models, class I finishing tended to have larger occlusal contact areas than class II finishing.
Bicuspid ; Molar* ; Tooth Movement
Bicuspid ; Molar* ; Tooth Movement
The Korean Journal of Orthodontics.2015;45(3):105-112. doi:10.4041/kjod.2015.45.3.105
OBJECTIVE: A recently developed facial scanning method uses three-dimensional (3D) surface imaging with a light-emitting diode. Such scanning enables surface data to be captured in high-resolution color and at relatively fast speeds. The purpose of this study was to evaluate the accuracy and precision of 3D images obtained using the Morpheus 3D(R) scanner (Morpheus Co., Seoul, Korea). METHODS: The sample comprised 30 subjects aged 24-34 years (mean 29.0 +/- 2.5 years). To test the correlation between direct and 3D image measurements, 21 landmarks were labeled on the face of each subject. Sixteen direct measurements were obtained twice using digital calipers; the same measurements were then made on two sets of 3D facial images. The mean values of measurements obtained from both methods were compared. To investigate the precision, a comparison was made between two sets of measurements taken with each method. RESULTS: When comparing the variables from both methods, five of the 16 possible anthropometric variables were found to be significantly different. However, in 12 of the 16 cases, the mean difference was under 1 mm. The average value of the differences for all variables was 0.75 mm. Precision was high in both methods, with error magnitudes under 0.5 mm. CONCLUSIONS: 3D scanning images have high levels of precision and fairly good congruence with traditional anthropometry methods, with mean differences of less than 1 mm. 3D surface imaging using the Morpheus 3D(R) scanner is therefore a clinically acceptable method of recording facial integumental data.
Anthropometry ; Seoul
Anthropometry ; Seoul
The Korean Journal of Orthodontics.2015;45(3):103-104. doi:10.4041/kjod.2015.45.3.103
No abstract available.
The Korean Journal of Orthodontics.2013;43(2):83-95. doi:10.4041/kjod.2013.43.2.83
OBJECTIVE: To evaluate the changes in cortical bone thickness, alveolar bone height, and the incidence of dehiscence and fenestration in the surrounding alveolar bone of posterior teeth after rapid maxillary expansion (RME) treatment using cone-beam computed tomography (CBCT). METHODS: The CBCT records of 20 subjects (9 boys, mean age: 13.97 +/- 1.17 years; 11 girls, mean age: 13.53 +/- 2.12 year) that underwent RME were selected from the archives. CBCT scans had been taken before (T1) and after (T2) the RME. Moreover, 10 of the subjects had 6-month retention (T3) records. We used the CBCT data to evaluate the buccal and palatal aspects of the canines, first and second premolars, and the first molars at 3 vertical levels. The cortical bone thickness and alveolar bone height at T1 and T2 were evaluated with the paired-samples t-test or the Wilcoxon signed-rank test. Repeated measure ANOVA or the Friedman test was used to evaluate the statistical significance at T1, T2, and T3. Statistical significance was set at p < 0.05. RESULTS: The buccal cortical bone thickness decreased gradually from baseline to the end of the retention period. After expansion, the buccal alveolar bone height was reduced significantly; however, this change was not statistically significant after the 6-month retention period. During the course of the treatment, the incidence of dehiscence and fenestration increased and decreased, respectively. CONCLUSIONS: RME may have detrimental effects on the supporting alveolar bone, since the thickness and height of the buccal alveolar bone decreased during the retention period.
Alveolar Bone Loss ; Bicuspid ; Cone-Beam Computed Tomography ; Incidence ; Molar ; Palatal Expansion Technique ; Periodontium ; Retention (Psychology) ; Tooth
Alveolar Bone Loss ; Bicuspid ; Cone-Beam Computed Tomography ; Incidence ; Molar ; Palatal Expansion Technique ; Periodontium ; Retention (Psychology) ; Tooth
Condylar repositioning using centric relation bite in bimaxillary surgery.
The Korean Journal of Orthodontics.2013;43(2):74-82. doi:10.4041/kjod.2013.43.2.74
OBJECTIVE: The purpose of this study was to evaluate displacement of the mandibular condyle after orthognathic surgery using a condylar-repositioning device. METHODS: The patient group comprised 20 adults who underwent bimaxillary surgery between August 2008 and July 2011. The degree of condylar displacement was measured by pre- and postoperative tomographic analysis using centric relation bite and a wire during surgery. A survey assessing temporomandibular joint (TMJ) sound, pain, and locking was performed. The 20 tomographs and surveys were analyzed using the Wilcoxon signed-rank test and McNemar's test, respectively. RESULTS: No significant changes were observed in the anterior, superior, or posterior joint space of the TMJ (p > 0.05). In addition, no significant change was observed in TMJ sound (p > 0.05). However, TMJ pain and locking both decreased significantly after surgery (p < 0.05). CONCLUSIONS: Due to its simplicity, this method may be feasible and useful for repositioning condyles.
Adult ; Bites and Stings ; Centric Relation ; Displacement (Psychology) ; Humans ; Joints ; Mandibular Condyle ; Orthognathic Surgery ; Temporomandibular Joint
Adult ; Bites and Stings ; Centric Relation ; Displacement (Psychology) ; Humans ; Joints ; Mandibular Condyle ; Orthognathic Surgery ; Temporomandibular Joint
Country
Republic of Korea
Publisher
Korean Association of Orthodontists
ElectronicLinks
http://e-kjo.org/Editor-in-chief
Hyoung-Seon Baik
office@e-kjo.org
Abbreviation
Korean J Orthod
Vernacular Journal Title
대한치과교정학회지
ISSN
2234-7518
EISSN
2005-372X
Year Approved
2007
Current Indexing Status
Currently Indexed
Start Year
1970
Description
The Korean Journal of Orthodontics (KJO) is an international, open access, peer reviewed journal published in January, March, May, July, September, and November each year. It was first launched in 1970 and, as the official scientific publication of Korean Association of Orthodontists, KJO aims to publish high quality clinical and scientific original research papers in all areas related to orthodontics and dentofacial orthopedics. Specifically, its interest focuses on evidence-based investigations of contemporary diagnostic procedures and treatment techniques, expanding to significant clinical reports of diverse treatment approaches.
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