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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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    • Reader’s Forum l 2019-09-25

      Reader's Forum

      Mohammed Alfaifi
    • Original Article l 2019-07-25

      Alveolar restoration following rapid maxillary expansion with and without corticotomy: A microcomputed tomography study in sheep

      My Huy Thuc Le , Abu Kasim Noor Hayaty, Zuraiza Mohamad Zaini, Sulaiman Md Dom, Norliza Ibrahim, and Zamri Bin Radzi

      Abstract : ObjectiveThis study examined bone microstructure restoration after rapid maxillary expansion (RME) with and without corticotomy over multiple retention periods.MethodsEighteen male Dorper sheep were randomly distributed into three groups (n = 6 each group): group 1, RME with corticotomy on the buccal and palatal sides; group 2, conventional RME treatment; and group 3, no treatment. Post-RME, trabecular bone microstructure and new bone formation were evaluated by using microcomputed tomography (microCT) and histomorphometry after a 4- or 12-week retention period. Intergroup differences in bone quality and bone remodeling were analyzed by using two-way analysis of variance with Bonferroni post-hoc test.ResultsThe bone volume fraction (bone volume [BV]/total volume [TV]) values relative to the control in groups 1 and 2 were 54.40% to 69.88% after the 4-week retention period and returned to approximately 80% after the 12-week retention period. The pooled BV/TV values of the banded teeth in groups 1 and 2 were significantly lower than those of the control after the 4-week retention period (p < 0.05). However, after the 12-week retention period, the pooled BV/TV values in group 2 were significantly lower than those in groups 1 and 3 (p < 0.05). Histomorphological analysis showed that the new bone formation area in group 1 was approximately two to three times of those in group 2 and control.ConclusionsCorticotomy significantly enhanced the restoration of bone quality after the retention periods for banded teeth. This benefit might result from the increased new bone formation after corticotomy.

      Abstract  
    • 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  
    • Reader’s Forum l 2020-01-25

      Reader's Forum

      Il-Hyung Yang
    • Reader’s Forum l 2019-07-25

      Reader's Forum

      Seung-Youp Lee

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