Analysis of mesiodistal angulations of preadjusted brackets

Abstract

Manufacturers offer various prescriptions of preadjusted brackets for use in the "straight-wire" orthodontic technique. However, the need to incorporate bends in the rectangular wires during orthodontic finishing has led to concerns regarding the type of prescription chosen and the credibility of information provided by the manufacturer. The aim of this study was to compare the slot angulations of Roth prescription preadjusted metallic brackets for the maxillary left central incisor and maxillary left canine. For each tooth type, 10 brackets of three commercial brands (GAC, Forestadent and Morelli) were selected. Two individual metal matrices for brackets and tooth positioning were made for each group of teeth. Captured images were obtained by standardized ortho-radial photography with a digital camera. Images were exported and analyzed with the Image J software package. Oneway ANOVA and Tukey statistical analyses were performed at the 5% significance level. For brackets of the maxillary left central incisor, differences in mean angulation were observed between the Morelli and GAC groups (p < 0.01) and between the Forestadent and GAC groups (p < 0.01). For brackets of the maxillary left canine, differences in mean angulation were found between the Morelli and GAC groups (p < 0.01) and between the Morelli and Forestadent groups (p < 0.05). In conclusion, despite their same prescription name, the different brands exhibited significantly different angulation measurements.

Orthodontic Treatment in the Rehabilitation of Congenitally Maxillary Lateral Incisors Agenesis with Multiple Maxillary Anterior Diastema

“…Brackets with a predetermined angulation to guide tooth movement and prescriptions of pre adjusted brackets are widely used. 13 By using pre adjusted technique, there is no need for wire bending. So, patient will experience more comfort.…”

Shear Bond Strength of Metallic Brackets: An In Vitro Stud

“…The meshes of Standard, Ligth and Agile brackets have similar conformations, with small spaces among metal webs, which are welded on the bases of these accessories [21][22][23][24]. However, the sizes of these brackets differ, with Standard being larger than Ligth and Agile, which have similar sizes, highlighting the aesthetics of the fixed orthodontic appliance.…”

A Comparative Study of the In-Built Torque and Slot Size of MBT Prescription Bracket of Different Manufacturing Companies: A Stereo-Microscopic Study

“…In 1972, Lawrence F. Andrews first developed the fully programed, or "preadjusted," brackets with built-in first, second, and third-order bends corresponding to horizontal, vertical, and bucco-lingual movements, respectively, with the objective of using archwires without bends. 1 Torque is produced by torsion in an "archwire" that creates a couple upon interacting with a "bracket slot." Depending on the magnitude of the torsion, the size and the quality of the wire, and the deformability of the bracket, the archwire moves the tooth through the torsional tension induced in the activated state.…”

“…In 1972, Lawrence F. Andrews first developed the fully programed, or “preadjusted,” brackets with built-in first, second, and third-order bends corresponding to horizontal, vertical, and bucco-lingual movements, respectively, with the objective of using archwires without bends. 1…”