Abstract
Aim: To demonstrate the main effects on maxillary and facial profile after treatment with expansion and face mask therapy in patients pattern III Class III. Material and Method: A cross-sectional study of maxillary expansion and reverse traction performed in 4 patients with maxillary deficiency, in the pre-peak pubertal growth stage and in the mixed dentition, with cephalograms before and after treatment, using angular measurements (SNA, SNENA, ANL and 1NA) and linear (S’-ENA, S’-A, 1-NA, OVERJET, S-LS and S-LI) and plot overlays. Results: Improvement in overjet was observed, going from negative to positive in all cases treated with incisor uncrossing, although it was not statistically significant. The upper and lower labial posture with respect to the base of the nose and the ment improved significantly, represented by the measurements S-LS and S-LI, with a change from the concave profile to slightly convex. Conclusion: Class III malocclusion with maxillary deficiency treated with rapid maxillary disjunction and reverse traction with facial mask was effective in both groups, with maxillary protraction and shifting in the concave to slightly convex profile.KeywordsFacial Mask; Rapid maxillary expansion; Class III.
Highlights
The pattern III of facial growth has genetic influences, which contribute to the determination of greater or lesser sagittal discrepancy of the bone bases
The objective of this research was to demonstrate the main effects on maxillary and facial profile after treatment with expansion and face mask therapy in patients pattern III Class III. This was a cross-sectional, quantitative, interventional study of a non-randomized clinical trial type previously approved by the Ethics and Research Committee (ERC) of the State University of Piauí with number 2.043.467 carried out in the orthodontic clinic of the orthodontics specialization course Federal University of Piauí (FUPI)
A clinical examination was performed to diagnose the previous cross-bite in the assisted children, with spontaneous demand, according to inclusion criteria, from June 2017 to May 2018 after signing the Free and Informed Consent Term (FICT) and the Term of Assent Free and Clarified (TAFC)
Summary
The pattern III of facial growth has genetic influences, which contribute to the determination of greater or lesser sagittal discrepancy of the bone bases. Due to its unfavorable facial characteristics, it is ideal that the diagnosis and interception be precocious to obtain greater orthopedic effects and smaller dental alterations [2,3]. For this reason, the best time to start treatment would be in the deciduous dentition, from the age of five or at the beginning of the mixed dentition, coinciding with the eruption of the upper central incisors [1,4,5,7]. The long-term success of treatment of Class III malocclusion by maxillary expansion and protraction therapy is associated with its onset prior to the pubertal growth spurt. The expansion mechanics is in opposition to the tendency of maxillary contraction during protraction [2,3,4,5,6]
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