Issues‎ > ‎Vol 7, issue 1‎ > ‎


Reliability of Expected Root Position in Two Different Bracket Bonding and Positioning Techniques (A Comparative Ex-Vitro Study)

Zhwan J. Rashid*, Omer F. Chawshli**

*Pedodontic, Orthodontic, and Preventive Dentistry Department, College of Dentistry, University of Sulaimani, Sulaimani, Iraq.
**Pedodontic, Orthodontic, and Preventive Dentistry Department, College of Dentistry, Hawler Medical University, Erbil, Iraq.

Submitted: 03/09/2020; Accepted: 28/10/2020; Published 01/12/2020



Objective: To measure the reproducibility of expecting root position (ERP) in various brackets bonding and positioning techniques.          

Methods: Twenty Angle’s Class-I typodont models were divided into four groups of five models each. The first two groups were bonded directly, and the other two groups were bonded indirectly. Intraoral scanning and CBCT were taken before and after simulation orthodontic treatment for each model. The pre-treatment CBCT of models was matched to the digital crown of the post-treatment intraoral scanner of the models in order to put the root in the expected position. At the same time, the true root position was obtained from the CBCT of post-treated models. Finally, the true and ERPs were superimposed by part comparison analysis function in 3-Matic software to measure mm displacement between two compared parts. The intra-examiner reliability was tested by the Bland-Altman method. One-way ANOVA was used to compare the displacement means of true and ERP.      

Results: There was no significant difference between the mean of true and ERP among the study groups for maxillary and mandibular arches (P>0.05).  

Conclusions: Combining data from CBCT and the digital models, simulation of the root positions was statistically validated with direct and indirect techniques of bracket positioning and bonding.


Keywords: Expected root position, CBCT, Bracket bonding, Bracket positioning.                                                                                                                                                                                                                Full Article - PDF                                                                                                                                                                                                                                   


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