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ePaper created 2016-04-19, 11:44:05 | version 1.38.0
orthodontic brackets design industry report | 41 ortho 1 2016 andoverwiththeidenticalvelocity,feedandlocation, without any varying components, including human fatigue. This control enables me to produce bracket slots less than a thousandth of an inch, every run and every year for the past 25 years. For orthodontists striving for excellence, it is im- portant to understand that different manufacturing techniquesproducedifferentresults.Avoidthemind- setthatallbracketsystemsaremoreorlessthesame. Physical principles always stay the same Inaccurate slots and inaccurate geometry will result in an incomplete transmission of the bracket prescription—itissimplephysics.Movementofteeth requiresapplicationofforces,andperiodontaltissue responds to these forces. Force mechanics are gov- erned by physical principles such as the laws of Newton and Hooke. Newton’s Laws1 · · The law of inertia · · The law of acceleration · · The law of action and reaction What does inaccuracy mean to you? Inaccuracy within the bracket slot is fully experi- encedwhenthree-dimensionalcontrolisrequired.For example, during a case when you require incisor incli- nation correction, additional root torque would need to be added to overcome the inaccurate slot. Sadly or- thodontistshavecometoaccept,andfullyexpectover- sizedslotsandlackofprecisionwithinthebracketsys- temtheyuse. Howeveracceptingthislackofprecision assomethingthatcan'tbecontrolledisincorrect. You should know how to solve these unexpected tooth movements, but you should not have to due to manufacturing inadequacies. I always liked Alexan- der’s2 simpleexplanationregardingtheclinicaltorque problem,forevery0.001inchoffreedombetweenthe archwire and the vertical bracket slot, approximately 5 degrees of effective torque is lost (Fig. 3). Think about when you apply this explanation to brackets withsingledigittorquevaluesmanufacturedwithin- accurate slot sizes, they have little, if any, advantage over a standard edgewise bracket. Physics helps you choose The principals of physics will never change; if your slot is inaccurate it will produce inaccurate results. This foundation of knowledge will help you navigate yourwaythroughthemanybracketchoicesavailable in the market. Accuracy within the slot is just one of the bench- marks met during the manufacturing of orthodontic brackets, but we cannot underestimate the signifi- cant role it plays for you, the orthodontist. My role and goal as an engineer and manufacturer is to provide you with true and accurate tools, elimi- nating the guess work and need to always compen- sate for a lack of precision, and enabling you to achieve optimal tooth movement and high-quality predictable results (Fig. 5)._ References [1] Biomechnics in orthodontics, Ram S. Nanda, BDS, DDS, MS, PHD – Yahya S. Tosun, DDS, PHD. [2] Alexander R.The 20 Principles ofAlexander Discipline.Chicago,Il: Quintessence Publishing: 2008. Fig.4:Profilebracketslotrepresentation ofmeasurementguides. Fig.5: Microscopic x400 picture of CNC slot—adjusted for publication— non-photoshopped bracket slot. Fig.4 Fig.5 contact Dipl.Ing.Claus Schendell President ofAdenta GmbH Adenta GmbH Gutenbergstraße 9 82205 Gilching Germany info@adenta.com www.adenta.com 12016