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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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    • Original Article l 2021-01-25

      Part II. What drives Korean adults to seek orthodontic treatment: Factors contributing to orthodontic treatment decisions

      Min-Hee Oh , Ae-Hyun Park , MinSoo Kim, Eun-A Kim, Jin-Hyoung Cho

      Abstract : Objective: This study aimed to identify the perceptions of orthodontic treatment among Korean adults and determine the factors that drive them to seek orthodontic treatment. Methods: A total of 2,321 adults aged 19–64 years were surveyed using an internet research system from a specialized research company. The participants were divided into the following groups based on their experience of and willingness to undergo orthodontic treatment: experience, acceptance, and non-acceptance groups. The characteristics of the participants were compared using analysis of variance with post-hoc analysis. Multinomial logistic regression analysis was performed in all three models with the non-acceptance group as a reference. Results: In terms of demographic characteristics, age, gender, marital status, and education had significant influences on orthodontic treatment decisions in adults in the experience and acceptance groups (p < 0.001). When all the factors were analyzed, age, marital status, past dental treatment experience, regular oral examinations, demand for orthodontic treatment, optimal treatment period, health insurance coverage, information on orthodontic treatments, perceptions regarding orthodontic treatment, and psychosocial impact of dental esthetics significantly influenced orthodontic treatment decisions in adults in the experience and acceptance groups (p < 0.001). Conclusions: These findings suggest that various factors influence orthodontic treatment decisions in adults. Individuals who seek orthodontic treatment were found to undergo more regular dental treatment and oral examination than those who did not. They also had a better perception of orthodontic treatment and more negative values for the psychosocial impact of dental esthetics.

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    • Original Article l 2021-01-15

      Cephalometric Predictors of Future need for Orthognathic Surgery in Korean Patients with Unilateral Cleft Lip and Palate Despite Long-term Use of Facemask with Miniplate

      Sang-Hun Yu , Seung-Hak Baek, Jin-Young Choi, Jong-Ho Lee, Sukwha Kim, Sung-Woon On

      Abstract : Objective: To investigate the cephalometric predictors of the future need for orthognathic surgery in Korean patients with unilateral cleft lip and palate (UCLP) despite long-term use of facemask with miniplate (FMMP). Methods: The sample consisted of 53 UCLP patients treated by a single orthodontist using an identical protocol. Lateral cephalograms were taken before commencement of FMMP therapy (T0; mean age, 10.45 years), after FMMP therapy (T1; mean age, 14.72 years), and at follow-up (T2; mean age, 18.68 years). Twenty-eight cephalometric variables were measured. At T2 stage, the subjects were divided into FMMP-Nonsurgery (n = 33, 62.3%) and FMMP-Surgery (n = 20, 37.7%) groups according to cephalometric criteria (point A-nasion-point B [ANB] < –3°; Wits-appraisal < –5 mm; and Harvold unit difference [HUD] > 34 mm for FMMP-Surgery group). Statistical analyses including discrimination analysis were performed. Results: In FMMP-Surgery group, the forward position of the mandible at T0 stage was maintained throughout the whole stages and Class III relationship worsened with significant growth of the mandibular body and ramus and counterclockwise rotation of the maxilla and mandible at the T1 and T2 stages. Six cephalometric variables at T0 stage including ANB, anteroposterior dysplasia indicator, Wits-appraisal, mandibular body length, HUD, and overjet were selected as effective predictors of the future need for surgical intervention to correct sagittal skeletal discrepancies. Conclusions: Despite long-term use of FMMP therapy, 37.7% of UCLP patients became candidates for orthognathic surgery. Therefore, differential diagnosis is necessary to predict the future need for orthognathic surgery at early age.

      Abstract  
    • Brief Report l 2021-03-25

      Micro-computed tomography evaluation of general trends in aligner thickness and gap width after thermoforming procedures involving six commercial clear aligners: An in vitro study

      Mario Palone , Mattia Longo, Niki Arveda, Michele Nacucchi, Fabio De Pascalis, Giorgio Alfredo Spedicato, Giuseppe Siciliani, Luca Lombardo

      Abstract : Objective: To assess the effects of thermoforming on aligner thickness and gap width in six aligner systems with the same nominal thickness. Methods: Six passive upper aligners of different brands were adapted to a single printed cast. Each sample was evaluated with high-resolution micro-computed tomography. To investigate aligner thickness and gap width, two-dimensional (2D) analysis was conducted assessing the effects of the following variables: tooth type (central incisor, canine, and first molar), 2D reference points, and aligner type. Data were analyzed and compared using analysis of variance and Tukey’s post-hoc tests (p < 0.05). Results: Tooth type, dental region, and aligner type affected both the gap width and aligner thickness. The aligner thickness remained moderately stable across the arch only in the F22. Conclusions: All thermoformed samples displayed smaller aligner thickness and gap width at anterior teeth and both gingival and coronal centers than at posterior teeth and occlusal surfaces.

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    • Original Article l 2019-11-25

      Predictors of midpalatal suture expansion by miniscrew-assisted rapid palatal expansion in young adults: A preliminary study

      Hyerin Shin, Chung-Ju Hwang, Kee-Joon Lee, Yoon Jeong Choi, Sang-Sun Han, and Hyung Seog Yu

      Abstract : ObjectiveWe sought to determine the predictors of midpalatal suture expansion by miniscrew-assisted rapid palatal expansion (MARPE) in young adults.MethodsThe following variables were selected as possible predictors: chronological age, palate length and depth, midpalatal suture maturation (MPSM) stage, midpalatal suture density (MPSD) ratio, the sella-nasion (SN)-mandibular plane (MP) angle as an indicator of the vertical skeletal pattern, and the point A-nasion-point B (ANB) angle for anteroposterior skeletal classification. For 31 patients (mean age, 22.52 years) who underwent MARPE treatment, palate length and depth, MPSM stage and MPSD ratio from the initial cone-beam computed tomography images, and the SN-MP angle and ANB angle from lateral cephalograms were assessed. The midpalatal suture opening ratio was calculated from the midpalatal suture opening width measured in periapical radiographs and the MARPE screw expansion. Statistical analyses of correlations were performed for the entire patient group of 31 subjects and subgroups categorized by sex, vertical skeletal pattern, and anteroposterior skeletal classification.ResultsIn the entire patient group, the midpalatal suture opening ratio showed statistically significant negative correlations with age, palate length, and MPSM stage (r = −0.506, −0.494, and −0.746, respectively, all p < 0.01). In subgroup analyses, a strong negative correlation was observed with the palate depth in the skeletal Class II subgroup (r = −0.900, p < 0.05).ConclusionsThe findings of this study indicated that age, palate length, and MPSM stage can be predictors of midpalatal suture expansion by MARPE in young adults.

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    • Published online December 28, 2020 l

      Decreasing friction between orthodontic brackets and arch wires 

      Nursel Arici , Berat S. Akdeniz , Abdullah A. Oz , Yucel Gencer , Mehmet Tarakci , Selim Arici

      Abstract : Objective: The aim of this study was to decrease the friction between orthodontic brackets and arch wires by using aluminum oxide (Al2O3), titanium nitride (TiN), and chromium nitride (CrN) medical coating materials. The coatings’ resistance to intra-oral conditions was evaluated. Methods: Stainless steel canine brackets, 0.016’’ round nickel titanium and 0.019 x 0.025’’ stainless steel arch wires were coated with Al2O3, TiN, and CrN using the Radio Frequency Sputtering method. The coated materials were examined using scanning electron microscopy, an x-ray diffractometer, atomic force microscopy, and surface profilometry. A modified tribometer was used to measure the in vitro coefficients of friction (CoFs) of the coated and uncoated materials. Samples were subjected to thermal cycling and in vitro brushing tests, and the effects of simulated intra-oral conditions on the coating structure were evaluated with scanning electron microscopy. Results: Coating both the metal bracket and nickel titanium arch wire with Al2O3 reduced the CoFs of the bracket arch wire combination (p < 0.01). Coating the bracket and stainless steel arch wire with Al2O3 and TiN resulted in statistically significantly lower CoFs (0.207 and 0.372, respectively) compared to the uncoated bracket and arch wire combination (0.552) (p < 0.01). The frictional wear, thermal, and brushing tests did not deteriorate the overall quality of Al2O3 coatings, but some small peeled areas were evident for TiN coatings and comparatively larger peeling was observed for CrN. Conclusion: The CoFs between the metal brackets and arch wires could be decreased with Al2O3 and TiN thin film coatings.

      Abstract  
    • Original Article l 2021-03-25

      Reasons influencing the preferences of prospective patients and orthodontists for different orthodontic appliances

      Guido Artemio Marañón-Vásquez , Luísa Schubach da Costa Barreto, Matheus Melo Pithon, Lincoln Issamu Nojima, Matilde da Cunha Gonçalves Nojima, Mônica Tirre de Souza Araújo, Margareth Maria Gomes de Souza

      Abstract : Objective: To evaluate the reasons influencing the preferences for a certain type of orthodontic appliance over another among prospective patients (PP) and orthodontists. Methods: A total of 49 PP and 51 orthodontists were asked about their preferences for the following appliances: clear aligners (CA), lingual metallic brackets (LMB), polycrystalline and monocrystalline ceramic brackets, and buccal metallic brackets (BMB). The participants rated the importance of 17 potential reasons that would explain their choices. The reasons that contributed most to these preferences were identified. Non-parametric tests (Fisher’s exact, χ2 and Mann–Whitney tests) and multivariate analyses (regression and discriminant analysis) were used to assess the data (α = 0.05). Results: CA and BMB were the most chosen appliances by PP and orthodontists, respectively. LMB was the most rejected option among both groups of participants (p < 0.001). Rates of the importance of pain/discomfort, smile esthetics, finishing details, and feeding/speech impairment showed the highest differences between PP and orthodontists (p < 0.0005). Discriminant analyses showed that individuals who considered treatment time and smile esthetics as more important were more likely to prefer CA, while those who prioritized finishing details and cost were more likely to choose BMB (p < 0.05). Conclusions: Reasons related to comfort and quality of life during use were considered as more important by PP, while those related to the results and clinical performance of the appliances were considered as more relevant by orthodontists.

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    • Case Report l 2020-01-25

      Distalization with a modified C-palatal plate for severe upper crowding and a missing lower incisor

      Jae Hyun Park, Traci Saito, Sun Kyong Yoo, Mohammed Alfaifi, and Yoon-Ah Kook

      Abstract : This case report presents the orthodontic treatment of a 25-year-old patient with skeletal Class II and severe maxillary arch crowding, moderate mandibular arch crowding, anterior crossbite, and a missing lower incisor. He was treated with molar distalization using a modified C-palatal plate and temporary anchorage devices to create sufficient space for retraction. The total treatment duration was 21 months. After treatment, his occlusion and smile esthetics showed significant improvement. The modified C-palatal plate represents a treatment modality that enhances the prospects of non-extraction treatment and reduces the need for extraction.

      Abstract  
    • Case Report l 2020-03-25

      Protraction of mandibular molars through a severely atrophic edentulous space in a case of juvenile periodontitis

      Jian-chao Wu, Yu-ting Zheng, and Yi-jun Dai

      Abstract : Moving the mandibular posterior teeth into a severely atrophic edentulous space is a challenge. A carefully designed force-and-moment system that results in bodily protraction of the posterior teeth with balanced bone resorption and apposition is needed in such cases. This report describes the treatment of a 19-year-old woman with missing mandibular first molars due to juvenile periodontitis. Miniscrews were used as absolute anchorage during protraction of the mandibular second and third molars. Bodily mesial movement of the mandibular second and third molars was achieved over a distance of 11 to 17 mm after 39 months of orthodontic treatment.

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Journal Info.

March, 2021
Vol.51 No.2

Frequency: 6 times

Journal Impact Factor

  • 1.476
    2018 IF

  • 1.523
    5-Year IF

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Clinical Journal of Korean Association of Orthodontists