Determining the short-term effects of different maxillary protraction methods on pharyngeal airway dimensions

Abstract

Objective: This study sought to evaluate the effects of different maxillary protraction methods on the pharyngeal airway in Class III patients with maxillary retrognathia. Setting and Sample Population: A total of 59 individuals (31 females and 28 males) with a mean age of 11.38 ± 1.24 years were included in this study. Material and Methods: Fifty- nine treated maxillary retrognathic patients who underwent different protraction methods were evaluated. Twenty patients treated with RME (Rapid Maxillary Expansion) made up the first group, and 20 patients treated with 5- week Alt- RAMEC (Alternate Rapid Maxillary Expansion and Constriction) protocol comprised the second group. Lastly, 19 patients on whom face masks with miniplates were applied were included in the skeletal anchorage (SA) group. Sixteen linear and four areal pharyngeal airway measurements were made on lateral cephalograms before and after treatment. Differences between the groups were assessed using analysis of variance (ANOVA) tests. Results: The mean maxillary protraction levels were determined as 2.7, 3.69 and 4.01 mm in the RME, Alt- RAMEC and SA groups, respectively. In the nasopharynx, AD1- PNS, AD2- PNS, PNS- Ba and PNS- Ho measurements revealed a significant increase in the SA group compared to the other groups (P < .05). In the oropharynx, PNS- Ep measurement increased significantly in the RME group (P < .05). In the total pharyngeal airway area, an increase was detected in the SA, Alt- RAMEC, and RME groups. Conclusion: The most effective protraction method in terms of pharyngeal airway dimensions, especially in the nasopharynx, is the application of the face mask with skeletal anchorage. A greater increase in vertical airway length (PNS- Ep) was observed with RME.