Korean J Orthod.  2017 May;47(3):158-166. 10.4041/kjod.2017.47.3.158.

Effects of bracket slot size during en-masse retraction of the six maxillary anterior teeth using an induction-heating typodont simulation system

Affiliations
  • 1Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea. hmkyung@knu.ac.kr
  • 2Department of Orthodontics, Faculty of Dental Science, Sri Ramachandra University, Chennai, India.

Abstract


OBJECTIVE
To investigate how bracket slot size affects the direction of maxillary anterior tooth movement when en-masse retraction is performed in sliding mechanics using an induction-heating typodont simulation system.
METHODS
An induction-heating typodont simulation system was designed based on the Calorific Machine system. The typodont included metal anterior and resin posterior teeth embedded in a sticky wax arch. Three bracket slot groups (0.018, 0.020, and 0.022 inch [in]) were tested. A retraction force of 250 g was applied in the posterior-superior direction.
RESULTS
In the anteroposterior direction, the cusp tip of the canine in the 0.020-in slot group moved more distally than in the 0.018-in slot group. In the vertical direction, all six anterior teeth were intruded in the 0.018-in slot group and extruded in the 0.020- and 0.022-in slot groups. The lateral incisor was significantly extruded in the 0.020- and 0.022-in slot groups. Significant differences in the crown linguoversion were found between the 0.018- and 0.020-in slot groups and 0.018- and 0.022-in slot groups for the central incisor and between the 0.018- and 0.022-in slot groups and 0.020- and 0.022-in slot groups for the canine. In the 0.018-in slot group, all anterior teeth showed crown mesial angulation. Significant differences were found between the 0.018- and 0.022-in slot groups for the lateral incisor and between the 0.018- and 0.020-in slot groups and 0.018- and 0.022-in slot groups for the canine.
CONCLUSIONS
Use of 0.018-in slot brackets was effective for preventing extrusion and crown linguoversion of anterior teeth in sliding mechanics.

Keyword

Tooth movement; Appliances; Heat induction typodont; Bracket slot size

MeSH Terms

Crowns
Incisor
Mechanics
Tooth Movement
Tooth*

Figure

  • Figure 1 Schematic diagram of the new induction-heating typodont simulation system devised in this study.

  • Figure 2 Three brackets, each with a different slot size (0.018, 0.020, and 0.022-inch from left to right). Except for the different in slot size, all other dimensions were the same.

  • Figure 3 The new typodont simulation system. A, The overall set-up; B, the coil box; C, six aluminum anterior teeth and six resin posterior teeth.

  • Figure 4 Typodont model constructed of sticky wax.

  • Figure 5 Set-up of the new typodont model. A first premolar extraction case model consisting of sticky wax alveolar bone, aluminum anterior and resin posterior teeth, anterior hook, posterior anchorage bar, and Niti coil spring for retraction.

  • Figure 6 Linear measurements. A, Occlusal view; B, sagittal view (+: anterior and extrusion directions).

  • Figure 7 Angular measurements. Resin cap with index wire (+: crown labial tipping).

  • Figure 8 Effects of bracket slot size for the canine. *p < 0.05.

  • Figure 9 Effects of bracket slot size for the lateral incisor. *p < 0.05.

  • Figure 10 Effects of bracket slot size for the central incisor. *p < 0.05.

  • Figure 11 Movement of anterior teeth. A, 0.018-inch (in) slot bracket; B, 0.020-in slot bracket; C and D, 0.022-in slot bracket.


Cited by  2 articles

Treatment of Class I crowding using simple tubes bonded with customized resin coverings: A case report
Seo-Rin Jeong, Hye-In Kim, Sung-Hoon Lim
Korean J Orthod. 2019;49(2):116-123.    doi: 10.4041/kjod.2019.49.2.116.

Comparison of inclination and vertical changes between single-wire and double-wire retraction techniques in lingual orthodontics
Bui Quang Hung, Mihee Hong, Wonjae Yu, Hee-Moon Kyung
Korean J Orthod. 2020;50(1):26-32.    doi: 10.4041/kjod.2020.50.1.26.


Reference

1. Park HS, Bae SM, Kyung HM, Sung JH. Micro-implant anchorage for treatment of skeletal Class I bialveolar protrusion. J Clin Orthod. 2001; 35:417–422. PMID: 11494827.
2. Jee JH, Ahn HW, Seo KW, Kim SH, Kook YA, Chung KR, et al. En-masse retraction with a preformed nickel-titanium and stainless steel archwire assembly and temporary skeletal anchorage devices without posterior bonding. Korean J Orthod. 2014; 44:236–245. PMID: 25309863.
3. Lee J, Miyazawa K, Tabuchi M, Sato T, Kawaguchi M, Goto S. Effectiveness of en-masse retraction using midpalatal miniscrews and a modified transpalatal arch: Treatment duration and dentoskeletal changes. Korean J Orthod. 2014; 44:88–95. PMID: 24696825.
4. Park HS, Kwon TG. Sliding mechanics with microscrew implant anchorage. Angle Orthod. 2004; 74:703–710. PMID: 15529508.
5. Kim YC. Finite element analysis of the effect of wire thickness on tooth movement in sliding mechanics. MSD thesis. Daegu, Korea: Kyungpook National University;2003.
6. Ji MJ. The effect of amount of torquing curve and thickness of archwire on the angulation of the teeth in six anterior teeth retraction. PhD thesis. Daegu, Korea: Kyungpook National University;2005.
7. Song HS. Three-dimensional finite element analysis of tooth axis of maxillary anterior teeth during retraction with microimplant. MSD thesis. Daegu, Korea: Kyungpook National University;2006.
8. Seo KW, Kwon SY, Kim KA, Park KH, Kim SH, Ahn HW, et al. Displacement pattern of the anterior segment using antero-posterior lingual retractor combined with a palatal plate. Korean J Orthod. 2015; 45:289–298. PMID: 26629475.
Article
9. Lee HC, Chun YS. A photoelastic study on the initial stress distribution of 3 types TMA multi-vertical loop arch wire. Korean J Orthod. 1995; 25:73–85.
10. Chaconas SJ, Caupto AA, Miyashita K. Force distribution comparisons of various retraction archwires. Angle Orthod. 1989; 59:25–30. PMID: 2923318.
11. Caputo AA, Chaconas SJ, Hayashi RK. Photoelastic visualization of orthodontic forces during canine retraction. Am J Orthod. 1974; 65:250–259. PMID: 4521359.
Article
12. Chen J, Isikbay SC, Brizendine EJ. Quantification of three-dimensional orthodontic force systems of T-loop archwires. Angle Orthod. 2010; 80:566–570. PMID: 20482364.
Article
13. Kumar YM, Ravindran NS, Balasubramaniam MR. Holographic analysis of the initial canine displacement produced by four different retraction springs. Angle Orthod. 2009; 79:368–372. PMID: 19216610.
Article
14. Moss ML, Skalak R, Patel H, Sen K, Moss-Salentijn L, Shinozuka M, et al. Finite element method modeling of craniofacial growth. Am J Orthod. 1985; 87:453–472. PMID: 3859222.
Article
15. Chun YS, Row J, Jung SH, Kim HJ. A study on the effect of the magnitude of the gable bends on the tooth movement pattern during en-masse space closure in the maxillary dentition. Korean J Orthod. 2004; 34:33–45.
16. Jeon HJ, Park SH, Jung SH, Chun YS. Three dimensional analysis of tooth movement using different sizes of NiTi wire on NiTi scissors-bite corrector. Korean J Orthod. 2009; 39:43–53.
Article
17. Rhee JN, Chun YS, Row J. A comparison between friction and frictionless mechanics with a new typodont simulation system. Am J Orthod Dentofacial Orthop. 2001; 119:292–299. PMID: 11244423.
Article
18. Kim SJ, Chun YS, Jung SH, Park SH. Three dimensional analysis of tooth movement using different types of maxillary molar distalization appliances. Korean J Orthod. 2008; 38:376–387.
Article
19. Kyung HM, Kim JY, Kyung IK. Heat Induction Typodont System® (HITS) for simulating orthodontic tooth movement. Clin J Korean Assoc Orthod. 2013; 3:177–178.
20. Park HS. Orthodontic treatment using micro. Seoul: Daehan Nare Publishing;2006.
21. Sia S, Shibazaki T, Koga Y, Yoshida N. Experimental determination of optimal force system required for control of anterior tooth movement in sliding mechanics. Am J Orthod Dentofacial Orthop. 2009; 135:36–41. PMID: 19121498.
Article
Full Text Links
  • KJOD
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2024 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr