Bracket placement in lingual vs labial systems and direct vs indirect bonding

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Abstract

Objective: To examine the ultimate accuracy of bracket placement in labial vs lingual systems and in direct vs indirect bonding techniques. Materials and Methods: Forty pretreatment dental casts of 20 subjects were selected. For each dental cast, four types of bracket placement were compared: labial direct (LbD), labial indirect (LbI), lingual direct (LgD), and lingual indirect (LgI). Direct bonding was performed with the casts held in a mannequin head. Labial brackets were oriented with a Boone gauge, and lingual brackets were oriented with the Lingual-Bracket-Jig System. Torque error (TqE) and rotation deviation (RotD) were measured with a torque geometric triangle and a toolmaker's microscope, respectively. Both torque and rotational measurements were evaluated statistically as algebraic and absolute numeric values, using analysis of variance with repeated measures. Results: Absolute TqE and RotD were significantly (P < .001) higher in direct than in indirect bonding techniques higher in both the labial and lingual bracket systems by twofold and threefold, respectively (LbD = 7.26°, 1.06 mm; vs LbI = 3.02°, 0.75 mm; LgD = 8.42°, 1.13 mm; vs LgI = 3.18°, 0.55 mm). No statistically significant difference was found between labial and lingual systems for the same bonding technique. Maxillary incisors demonstrated the largest RotD angle (eg, right lateral: 12.04°). A distal off-center RotD was predominant in the mandibular dentition. Conclusions: Labial and lingual systems have the same level of inaccuracy. For both systems, indirect bonding significantly reduces absolute TqE and RotD. The TqE found can cause transverse discrepancy (scissors or crossbite) combined with disclusion with antagonist teeth. The RotD found can result in irregular interproximal contact points.

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalAngle Orthodontist
Volume77
Issue number3
DOIs
StatePublished - May 2007

Keywords

  • Bracket placement
  • Labial brackets
  • Lingual brackets
  • Rotation
  • Torque

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