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:: Volume 21, Issue 4 (Winter (Special Issue) 2004) ::
J Dent Sch GYEAR__, 21(4): 622-633 Back to browse issues page
Effects of different methods of debonding on orthodontic bracket dimensions
Ladan Eslamian Corresponding Author: Dr. * 1, Behnam Eslami Dr., Pejman Hadi Sadegh Dr.
Abstract:   (6993 Views)

Aim: This study was performed to define the effect of three methods of debonding on three different metal brackets’ dimensions.

Method & Materials: 108 standard edgewise brackets (with 22 mil slot system), equally from three companies American Orthodontics (AO), 3M Unitek, Dentaurum were bonded on facial surface of extracted intact upper and lower premolars. 18 mil round wire was engaged in half of brackets. Teeth were put in 370C water and after 48 hrs, brackets were debonded with three methods respectively: 1- Cutting bracket base mesiodistally with slitting plier 2- Applying peeling type force with 45 degree angle outwardly by bracket removing plier and 3- Debonding with the help of Lift Off debracketting instrument (LODI). Bracket distortion was evaluated with macroscopic and microscopic methods (slot width, slot depth, bracket width). Olympus stereomicroscopic (x20 magnification) and Adobe Photoshop software were used for measuring dimensions of brackets. Multifactorial variance analysis and LSD test were used in this study.

Results: Cutting brackets from bases was destructive for foil mesh bases of AO, Dentaurum brackets (21%) and base distortions were distinguishable with unarmed eyes. Mean slot width of brackets after debonding were increased (not clinically significant) and Dentaurum brackets had the most changes (P<0.01). These changes with the increase in slot width after recycling can decrease the efficiency of brackets in applying effective torque (between 0 to 14 degrees). Mean bracket width was decreased in Dentaurum brackets (P<0.01) specially with peeling type force (P<0.001). Changes in bracket width were not significant clinically. Presence of 18 mil round wire in bracket slots, had no effect on changes observed after different methods of debonding of different brackets.

Conclusion: For AO and Dentaurum foil mesh brackets, the best method for debonding was applying a peeling type force with 45 degrees outwardly and for 3M Unitek integral brackets, cutting bases mesiodistally was the best method. Using LODI for one time debonding is an acceptable method for all different brackets.

J Dent Sch 2004 21(Special Issue): 622

Keywords: Debonding, Bracket width, Slot width
Full-Text [PDF 290 kb]   (1039 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2006/09/6
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Eslamian L, Eslami B, Hadi Sadegh P. Effects of different methods of debonding on orthodontic bracket dimensions. J Dent Sch. 2004; 21 (4) :622-633
URL: http://jds.sbmu.ac.ir/article-1-621-en.html

Volume 21, Issue 4 (Winter (Special Issue) 2004) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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