Abstract
The objective of this study was to evaluate a sagittal variation on the lower incisors with the use of the lingual arch on the transition from mixed to permanent dentition. The sample was constituted of 44 Caucasian patients (26 girls and 18 boys), divided in two groups: CG, control group, monitoring the lower arch space with no orthodontic/orthopedic treatment during the rated period (n = 14); EG, experimental group, presenting anterior inferior mild crowding and installation of the lingual arch for space maintenance (n = 30). The position of the lower incisors was analyzed on computerized cephalometric tracings performed at the beginning of the monitoring (T1) and at the end, on the permanent dentition (T2). In order to evaluate the position of the incisors it was used Tweed and Steiner measurements: IMPA, 1.NB and 1-NB. The alterations were analyzed through the "t" test for paired samples, while the differences between the groups were analyzed through the "t" test for independent samples, as for sexual dimorphism. The values in T2 were greater in relation to T1 for all measurements on EG (IMPA, p = 0.038; 1.NB, p = 0.007 and 1-NB, p < 0.0001). On comparing the differences (T2-T1) between CG and EG, it can be gauged differences significantly superior for measure 1.NB (p = 0.002) and 1-NB (p < 0.0001) on EG. There was no statistically significant difference between genres. It was concluded that the lower incisors were projected after using the lingual arch to control the space on the transition from mixed to permanent dentition, however, within acceptable standards, not having difference between genres.
Highlights
ObjectiveThe objective of this study was to evaluate a sagittal variation on the lower incisors with the use of the lingual arch on the transition from mixed to permanent dentition
The transition period from mixed dentition to permanent was monitored in two ways: Control group (CG, n = 14), space monitoring with no orthodontic/orthopedic treatment during the rated period; Experimental group (EG, n = 30), presenting anterior inferior mild crowding and installation of the lingual arch, previously to exfoliation of deciduous second molar, for space maintenance (Fig 1A)
The data show the projection on the lower incisors with the utilization of the passive lingual arch
Summary
The objective of this study was to evaluate a sagittal variation on the lower incisors with the use of the lingual arch on the transition from mixed to permanent dentition. Conclusion: It was concluded that the lower incisors were projected after using the lingual arch to control the space on the transition from mixed to permanent dentition, within acceptable standards, not having difference between genres. The transition period from mixed dentition to permanent was monitored in two ways: Control group (CG, n = 14), space monitoring with no orthodontic/orthopedic treatment during the rated period; Experimental group (EG, n = 30), presenting anterior inferior mild crowding and installation of the lingual arch, previously to exfoliation of deciduous second molar, for space maintenance (Fig 1A). To verify the normality of the data it was used the Kolmogorov-Smirnov non-parametric test, concluding that they have normal distribution
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