Abstract
AimTo evaluate the maxillary dentition effects of the extrusion arch for anterior open bite (AOB) correction in mixed dentition patients.Materials and methodsFourteen subjects with an initial mean age of 9.17 ± 1.03 years presenting with dentoalveolar AOB (mean − 1.28 ± 1.46 mm) and normal facial pattern (FMA = 25.76°) were treated with an extrusion arch. The mean treatment period was 7.79 ± 2.58 months. Lateral cephalograms and dental models were taken before (T0) and after the correction of AOB (T1). Data were analyzed using paired t test to evaluate differences between T0 and T1. For all tests, a significance level of P < .05 was used.ResultsAll patients achieved positive overbite at T1, with a mean increase of 3.07 mm. The maxillary incisors extruded 1.94 mm. Retroclination of the maxillary incisors (− 6.15°) and an increase in the interincisal angle (5.57°) were observed. There was a significant decrease in the distance between the incisal edge of the maxillary incisors and the molars (− 2.21 mm). There was significant mesial tipping of the maxillary molar (− 11.49°). Significant reductions of overjet (− 1.65 mm), arch perimeter (− 3.02 mm), and arch length (− 2.23 mm) were noted. The transverse maxillary intermolar distance did not change significantly.ConclusionsThe use of a maxillary extrusion arch was effective in the treatment of AOB. Overbite increased due to incisor extrusion, as well as retroinclination and overjet reduction. However, side effects, such as mesial molar tipping and decreases in arch perimeter and length might occur.
Highlights
Anterior open bite (AOB), defined as the absence of positive vertical overlap between the upper and lower incisors [1], is a major concern for orthodontists due to the psychological, esthetic, speech, and functional impairments it causes, in addition to having various etiologic factors [1]
There was a significant decrease in the distance between the incisal edge of the maxillary incisors and the molars (− 2.21 mm)
The use of a maxillary extrusion arch was effective in the treatment of AOB
Summary
Anterior open bite (AOB), defined as the absence of positive vertical overlap between the upper and lower incisors [1], is a major concern for orthodontists due to the psychological, esthetic, speech, and functional impairments it causes, in addition to having various etiologic factors [1]. Among the oral habits most often associated with this malocclusion are thumb and pacifier sucking [3, 4, 5]. Due to this strong association with the occurrence of oral habits, it is more prevalent during. The majority of these appliances require patient cooperation and can cause some discomfort. Approaches with fixed devices that do not rely on patient compliance have been increasingly adopted, such as the extrusion arch [10, 11, 12]
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