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| industry report rapid overbite correction Fig. 7a Fig. 7b Fig. 7c Fig. 7d Fig. 7e Figs. 7a –e: BT2s in Class III treatment are bonded to the lingual of the lower incisors to increase the vertical dimension and to permit the placement incisors. This makes use of reduced resistance in vitro and active seating of archwires for tooth control including torque (future publication). of the active self-ligating appliance on Summary of BT2 application: [6] Engel G, Damerell JM, McAlpine J, Walters R. Treatment of deep- bite cases. Am J Orthod 1980;77:1–13. [7] Storey AT. Physiology of a changing vertical dimension. J Pros Dent 1962;12:912–21. [8] Manns A, Miralles R, Guerrero F. The changes in electrical activity of the postural muscles of the mandible upon varying the vertical dimension. J Prosthet Dent 1981;45:438–4. [9] Rugh JD, Drago CJ. Vertical dimension: a study of clinical rest position and jaw muscle activity. J Prosthet Dent 1981;45: 70–5. [10] Bjork A. Variability and age changes in overjet and overbite. Am J Orthod 1953;39:779–801. [11] Bjork A. The use of metallic implants in the study of facial growth in children: method and application. Am J Phys An- the labial of the upper incisors that were 1. Metal BT2s are highly effective chairside for Rapid thropol 1968;29:243–54. previously in contact with the lower Bite Correction (RBC) for a minimum of 6 months incisors and subject to shear force debonding. Note the opening of the occlusion posteriorly. 2. Efficiency chairside is gained by ready-made, bondable BT2s, that do not wear, and have bulbous rounded ends for tongue comfort in both children and adults 3. BT2s were easier to bond with a positioning instru- ment due to the new vertical groove (split) that made them also significantly easier to debond. The specialised curvature also developed early anterior guidance at a new vertical 4. BT2s are directly bonded to the palatal of the upper central incisors replacing prior plastic moulds of bite ramps that required packed, light-cured resin that wears and is swallowed by patients through- out treatment 5. BT2s permit differential eruption of the molar teeth and are a significant improvement to bonded molar resin supports used for vertical correction in the past. The reason is prior molar resin supports are contraindicated since they have been shown to clinically intrude molars._ References [1] Kim T, Little RM. Postretention assessment of deep overbite correction in Class II division 2 malocclusion. Angle Orthod 1999;69:175–86. [2] Berg R. Stability of deep overbite correction. Eur J Orthod 1983;5:75–83. [3] Haynes S. The distribution of overjet and overbite in English chil- dren aged 11-12 years. Dent Pract Dent Rec 1972;22:380–383. [4] Hirschfelder U, Fleischer-Peters A. The functional treatment of deep bite—the results of a long-term study. Fortschr Kiefer or- thop 1992;53:313–21. [5] Hirschfelder U, Hertrich K. The treatment of deep bite in adults. Fortschr Kiefer orthop 1990;51:36–43. about Dr John C. Voudouris maintains teaching positions at the University of Toronto, as Associate in Orthodontics, Discipline of Orthodontics for 31 years teaching functional appliances, and at New York University, as Visiting Scholar, Division of Biological Sciences for 18 years, teaching Siamese twin active self-ligation that he developed in 1994. He is a full member of the Edward H. Angle East Society, and the recipient of the University of Toronto, Department of Orthodontics, Aaron Posen Award for Clinical Excellence. Dr Voudouris received the prestigious American Association of Orthodontist’s Milo Hellman Research Award for condylar growth modifications and glenoid fossa remodelling with Herbst appliances applying electromyographic, cephalometric, and histological investigations. Dr Vittorio Gaveglia is a private orthodontic specialist in Rome and addition- ally a graduate of the University G. D’Annunzio, at Chieti, Italy, in the field of Orthodontics, Gnathology and Orofacial Pain. Dr Gaveglia is a member of SIDO Italian Society of Orthodontics, and co-inventor and developer of several innovations including the i-Arch wire system in partnership with SIA Orthodontic Manufacturer (Italy). James John Poulos is a research student at The University of Toronto working with Dr Voudouris for over 2.5 years, and a senior in the Doctor of Dental Medicine Program at The Ohio State University, College of Dentistry, in Columbus, Ohio. 36 ortho 1 2017