대한치과교정학회지 (The korean journal of orthodontics)

  • 제50권6호
  • /
  • Pages.401-406
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  • 2020
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  • 2234-7518(pISSN)
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  • 2005-372X(eISSN)
대한치과교정학회 (The Korean Association Of Orthodontists)
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Comparison of slot sizes and parallelism of metal brackets manufactured through metal injection molding and computerized numerical control

  • Park, Jae-Sung (Private Practice) ;
  • Song, In-Tae (Department of Orthodontics, College of Dentistry, Wonkwang University) ;
  • Bae, Jae-Hee (Department of Orthodontics, College of Dentistry, Wonkwang University) ;
  • Gil, Soo-Min (Department of Orthodontics, College of Dentistry, Wonkwang University) ;
  • Kang, Kyung-Hwa (Department of Orthodontics, College of Dentistry, Wonkwang University)
  • 투고 : 2020.04.29
  • 심사 : 2020.07.13
  • 발행 : 2020.11.30
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초록

Objective: To investigate and compare the slot sizes and parallelism of metal injection molding (MIM) and computerized numerical control (CNC) brackets. Methods: The following four MIM bracket series with 0.022-inch (in) slots were selected for investigation: Di MIM mini Twin (Ortho Organizers), Mini Diamond Roth (Ormco), Gemini MBT (3M Unitek), and Formula R Roth (Tomy). The following four CNC bracket series with 0.022-in slots were selected for investigation: Econoline MBT (Adenta), Legend mini MBT (GC Orthodontics), Crown mini MBT (Adenta), and Evolve MBT (DB Orthodontics). The slot dimensions were measured using an optical microscope (XTCam-D310M; Mitutoyo) with a resolution of 1 ㎛. The results were statistically analyzed using one-way analysis of variance and the Tukey post-hoc test with a significance level of 0.05. Results: The results indicated that all the investigated slot sizes were oversized with respect to the manufacturers' specifications (0.022 in). Among the eight bracket series, the Di MIM bracket (MIM) was the most oversized by 10.4%, whereas the Evolve bracket (CNC) was the least oversized by 2.6%. The slots in seven of the bracket series had divergent walls instead of parallel ones. The Evolve bracket alone had parallel slot walls. Conclusions: Regardless of the manufacturing method, all the slot sizes of the brackets investigated in this study were significantly oversized; most of the slot walls were nonparallel, except for those of the Evolve bracket. This study could not establish that the CNC method was more accurate than the MIM method in manufacturing bracket slots.

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참고문헌

  1. Silver M, Griffin AC Jr, Azzopardi L, Masoud MI, Tokede O, Griffin AC 3rd. Novel methods reveal that parallelism contributes to the functional vertical slot dimension in ceramic and metal brackets. Angle Orthod 2018;88:812-8. https://doi.org/10.2319/010518-10.1
  2. Proffit WR, Fields HW, Sarver DM. Contemporary orthodontics. 5th ed. St. Louis: Mosby Elsevier; 2013.
  3. Bennett JC. Fundamentals of orthodontic bracket selection: a user guide. 2nd ed. London: Le Grande Publishing; 2010.
  4. Alexander RG. The 20 principles of the Alexander discipline. Chicago: Quintessence Publishing; 2008.
  5. Brown P, Wagner W, Choi H. Orthodontic bracket slot dimensions as measured from entire bracket series. Angle Orthod 2015;85:678-82. https://doi.org/10.2319/042814-307.1
  6. Eliades T, Zinelis S, Bourauel C, Eliades G. Manufacturing of orthodontic brackets: a review of metallurgical perspectives and applications. Recent Pat Mater Sci 2008;1:135-9. https://doi.org/10.2174/1874464810801020135
  7. Zinelis S, Annousaki O, Makou M, Eliades T. Metallurgical characterization of orthodontic brackets produced by Metal Injection Molding (MIM). Angle Orthod 2005;75:1024-31.
  8. Cash AC, Good SA, Curtis RV, McDonald F. An evaluation of slot size in orthodontic brackets--are standards as expected? Angle Orthod 2004;74:450-3.
  9. Kusy RP, Whitley JQ. Assessment of second-order clearances between orthodontic archwires and bracket slots via the critical contact angle for binding. Angle Orthod 1999;69:71-80.
  10. Bhalla NB, Good SA, McDonald F, Sherriff M, Cash AC. Assessment of slot sizes in self-ligating brackets using electron microscopy. Aust Orthod J 2010;26:38-41.
  11. Major TW, Carey JP, Nobes DS, Major PW. Orthodontic bracket manufacturing tolerances and dimensional differences between select self-ligating brackets. J Dent Biomech 2010;2010:781321.
  12. Siatkowski RE. Loss of anterior torque control due to variations in bracket slot and archwire dimensions. J Clin Orthod 1999;33:508-10.
  13. Eliades T. Orthodontic materials research and applications: part 2. Current status and projected future developments in materials and biocompatibility. Am J Orthod Dentofacial Orthop 2007;131:253-62. https://doi.org/10.1016/j.ajodo.2005.12.029
  14. McLaughlin RP, Bennett JC. McLaughlin RP, Bennett JC. Evolution of treatment mechanics and contemporary appliance design in orthodontics: a 40-year perspective. Am J Orthod Dentofacial Orthop 2015;147:654-62. https://doi.org/10.1016/j.ajodo.2015.03.012