ortho - the international C.E. magazine of orthodontics

06 I I C.E. article_ self-ligating systems _Abstract The purpose of this study was to determine if various bracket clips are strong enough to provide a proper archwire/slot engagement. If yes, then we wanted to determine if the active clip shows lack of power after loading. _Introduction If a bracket system is not capable of offering an efficient and strong ligation to properly engage the archwire, the orthodontist will encounter varying degrees of difficulty during treatment. These prob- lems will not occur during the leveling phase, when the force delivered by the archwire deflection is not so powerful. Therefore, during the initial phase, the ligation system doesn’t need to exert the same level of force. However, during the phases that demand rectangular-geometry-archwires utilization for the torqueincorporation,wemustconsidertheability— or not — of the clip to press and hold the wire firmly engaged to the bracket slot, bringing the desired prescription details needed for ideal positioning. Therearemanyreasonscorrecttorqueexpression isimportant.Theuseofaninteractivebracketsystem, whoseclipsaremadeofareliablematerialthatoffers enough resilience and flexibility, is necessary for the applicationofconstantandphysiologicforces.These forces will guarantee proper control of the dental movements in the three planes of the space. By understanding the importance of the affirma- tionsabove,thisstudyaimstoevaluatefourdifferent models of interactive self-ligating brackets in order to verify which group will show the best perform- ance. In this case, “best” will be represented by the leastforcelossafterbeingsubmittedtoacertainload during a period of time. _Materials Inthistrial,bothmetallicandceramicself-ligation interactive brackets (second premolars, 0.022-inch by 0.028-inch slots, Roth prescription) were tested (Table 1). In all the groups, the clip is composed by Cr-Co stainless-steel alloy. A number of eight brack- ets composed each group. _Methods Specificmethodologywascreatedbasedonaload cell machine. A custom metallic cylinder that held all eight brackets was designed for this experiment, ortho1_2014 Biomechanical behavior of self-ligating interactive systemsAuthor_Dr. Celestino Nobrega This article qualifies for C.E. credit. To take the C.E. quiz, log on to www.dtstudyclub. com. Click on ‘C.E. articles’ and search for this edition (Ortho C.E. Magazine — 1/2014). If you are not regis- tered with the site, you will be asked to do so before taking the quiz. You may also access the quiz by using the QR code below. _c.e. credit

ortho - the international C.E. magazine of orthodontics

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