Abstract
The present study aimed at analyzing, with the use of dental casts, the transverse changes of the upper and lower dental arches, after non-extraction orthodontic treatment, with self-ligating brackets. The sample comprised 29 patients, all presenting Class I malocclusion with upper and lower crowding of at least 4 mm and treated only with a fixed appliance, without stripping, extraction or distalization. The dental casts were obtained before and after leveling with 0.019 x 0.025-in stainless steel archwires. The results indicated that the majority of transverse changes occurred at the premolar areas, both the first and the second, as well as on the upper and lower dental arches. The intercanine distance increased 0.75 mm, on average, in the upper arch and 1.96 mm in the lower arch. The molars also demonstrated a tendency towards an increase in their transverse dimension, however, at a lower intensity comparing to premolars. All measurements presented statistically significant differences with the exception of the maxillary second molars.
Highlights
ObjectiveThe present study aimed at analyzing, with the use of dental casts, the transverse changes of the upper and lower dental arches, after non-extraction orthodontic treatment, with self-ligating brackets
The results showed a strong tendency of intercanine width to return to its initial dimension and the length of the dental arch to substantially decrease in all cases during the post-retention period
There seemed to have a more uniform distribution of labial movement between the premolars and molars, but with even more intensity for the region of the premolars. This result challenges conventional orthodontics when it proposes that the passive property of the bracket system, allowing all bonded brackets to function as tubes and applying extremely light forces due to the use of light and superelastic wires, allowing for a slow expansion of the dental arches, in many cases eliminating the need for rapid expansion, especially surgically assisted for the maxilla
Summary
The present study aimed at analyzing, with the use of dental casts, the transverse changes of the upper and lower dental arches, after non-extraction orthodontic treatment, with self-ligating brackets. Shapiro[18] sought to identify the alterations that occur in between the intercanine, intermolar widths and the arch length in the pre- and post-treatment phases and 10 years after retention in the lower dental arch in patients orthodontically treated, with or without extractions. Lower dental casts of 80 treated subjects were evaluated, who initially presented Class I or Class II malocclusions, division 1 or 2, measuring the intercanine distance, having the cusp tips of the canines as reference, and intermolar distances, based on the cusp tips of the first molars. When they were reintroduced in orthodontics, self-ligating brackets promised tooth movement with a significant reduction of friction. With the caliper positioned parallel to the occlusal plane, it was measured the distance between the cusp tips of the canines, followed by the figure 1 - Transverse measurements performed on the upper and lower casts
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