Related Experiment Video
Updated: Mar 12, 2026
Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
Published on: February 23, 2024
Influence of Preadjusted Bracket Shape and Positioning Reference on Angulation of Upper Central Incisor
Francielle Topolski1, Mauricio A de O Accorsi2, Hugo J Trevisi3
1Department of Pediatric and Community Dentistry, Dental School of Araçatuba, Universidade Estadual Paulista - UNESP (São Paulo State University), Araçatuba, São Paulo, Brazil,
Aim:
To verify the influence of different bracket shapes and placement references according to Andrews and MBT systems on the expression of angulation in upper central incisors (UCI).
Materials And Methods:
Bracket positioning and mesiodistal dental movement simulations were performed and the angulations produced in the dental crown were evaluated, based on computed tomography scan images of 30 UCI and AutoCAD software analysis. Rectangular (Andrews) and rhomboid (MBT) brackets were placed according to the references recommended by Andrews and MBT systems - long axis of the clinical crown (LACC) and incisal edge (IE) respectively.
Results:
Data showed that the use of LACC as reference for bracket positioning produced 5° and 4° UCI angulations in Andrews and MBT brackets respectively. The use of IE produced a 1.2° mean angulation in UCI for both brackets.
Conclusion:
When the LACC was used as reference for bracket positioning, the UCI crown angulation corresponded to the angulation built into the brackets, regardless of shape, while the use of IE resulted in natural crown angulation, regardless of bracket shape.
Clinical Significance:
This research contributes to guide the orthodontist in relation to the different treatment techniques based on the use of preadjusted brackets.
