in this issue: contents 42 Continuing Education Slop-py Work Drs. Elizabeth R. Michalczyk, Noam Green and Alise Senderak share research and a formula for calculating theoretical torque loss in rectangular and square-shaped archwires. MESSAGE BOARDS from orthotown.com DEPARTMENTS 8 Embrace Progress 2020 and the 4th Dimension As the year comes to a close, Orthotown editorial director Dr. Dan Grob reflects on the future of orthodontics, what orthodontists should look out for and the rising importance of understanding orofacial musculature. 14 Class II Div 1 Deep-Bite Teen Aligner Case A Townie shares an Invisalign case that utilized elastics to achieve a nice result. 12 41 Poll: Small Equipment and Supplies Ad Index 17 Extraction Mx 6 This Townie seeks some mechanics tips on a fairly straightforward extraction case. orthotown.com \\ DECEMBER 2020 OT1220_TOC.indd 5 5 11/24/20 11:29 AMhttp://www.orthotown.com