TAD Assisted Retraction in A Lingual Appliance for Correction of Dentoalveolar Class II Malocclusion
Abstract
ABSTRACT
Orthodontics, in today’s contemporary world, is focused mainly on aesthetics. Most of the adult patients are reluctant to orthodontic treatment due to their un-aesthetic appearance. To answer such problems several options are available, ranging from aesthetic brackets, made from tooth-coloured plastic or ceramic, another option is Invisalign, which is restricted to the treatment of only certain kinds of simple malocclusions. Hence, the lingual appliance selected for this case is by far the best option available from the aesthetic outlook and mechanical aspect however torque control of anterior teeth in lingual orthodontic appliance has always been considered a major problem. For maintaining the torque value of anterior teeth either we have to apply direct moment and force to the lingual brackets or by using a different combination of lever-arm and mini-screws mechanics to deliver force in a line that passes through or near to the center of resistance. In the present case, we utilized the combination of long lever-arm and palatal mini-implant system to produce a controlled en-masse retraction of the anterior teeth. This customised long lever arm created by soldering one power to others such that the point of force application is close the center of resistance.
References
2. Echarri P. Lingual orthodontics: Patient selection and diagnostic considerations. SeminOrthod.2006;12:160-6.
3. Lin W, Fiona Pang KK, Sukie Wong UT, Doshi V. Mini-screws, a viable adjunct along with Incognito lingual appliance: A case series. APOS Trends Orthod.2015;5:275-8.
4. Hong RK, Heo JM, Ha YK. Lever-Armand mini-implant system for anterior torque control during retraction in lingual orthodontic treatment. Angle Orthod.2005;75:129-141.
5. Takemoto K. Sliding mechanics versus loop mechanics during en-masse retraction in extraction cases. In: Romano R, ed. Lingual Orthodontics. Hamilton, Ontario, Canada: BC Decker; 1998:109– 115.
6. Hong RK. Mushroom Archwire Technique and the Lingual Bracket. Seoul, South Korea: Jeesung; 2000:58–69.
7. Park YC, Choy K, Lee JS, Kim TK. Lever- arm mechanics in lingual orthodontics. J Clin Orthod.2000;34:601-605.
8. VandenBulcke MM, Burstone CJ, Sachdeva RCL, Dermaut LR. Location of the centers of resistance for anterior teeth during retraction using the laser reflection technique. Am J Orthod DentofacialOrthop.1987;91:375–384.
9. M. Aravind, G.Shivaprakash, G.C Ramesh. Torque control in lingual orthodontics with lever arm mechanics: A case report. ORTHODONTICS (CHIC) 2013;14:e186–e196.
10. Yoshida N, Brinkmann PGJ, Koga Y, Mimaki N, Kobayashi K. Experimental evaluation of initial tooth displacement center of resistance and center of rotation under the influence of an orthodontic force. Am J Orthod Dentofacial Orthop.2001;120:190-197.
11. Pendersen E, Isidor F, Gjessing P, Andersen K. Location of the center of resistance for maxillary anterior teeth measured on human autopsy material. Eur J Orthod.1991;13:452-458.
12. Creekmore TD, Eklund MK. The possibility of skeletal anchorage. J ClinOrthod. 1983; 17:266–269.
13. Kanomi R. Mini-implant for orthodontic anchorage. J ClinOrthod. 1997; 31:763–767.
14. Lee JS, Park HS, Kyung HM. Micro-implant anchorage for lingual treatment of a skeletal Class II malocclusion. J ClinOrthod. 2001; 35:643–647.
15. Karaman AI, Basciftci FA, Polat O. Unilateral distal molar movement with an implant-supported distal jet appliance. Angle Orthod. 2002; 72:167–174.
16. Kyung SH, Hong SG, Park YC. Distalization of maxillary molars with a midpalatal miniscrew. J ClinOrthod. 2003; 37:22–26.
17. Park YC, Lee SY, Kim DH, Jee SH. Intrusion of posterior teeth using mini-screw implants. Am J Orthod Dentofacial Orthop.2003;123:690–694.
18. Kim KH, et al. Finite element analysis of the effectiveness of lever arm in lingual sliding mechanics. Korean J Orthod. 2011;41(5):324–36.
19. Liang W, Rong Q, Xu B. Torque control of the maxillary incisors in lingual and labial orthodontics: a 3-dimensional finite element analysis. Am J Orthod Dentofacial Orthop. 2009; 135:316–22.
