Soft tissue and dentoskeletal profile changes associated with maxillary expansion and protraction headgear treatment

Objective:To determine what therapeutic effects can be expected in the case of early treatment of Class III relations with removable appliances with or without face masks. Materials and Methods: Records available at the university clinic of Tü bingen for 41 patients who had undergone early treatment because of prognathic abnormalities were retrospectively evaluated. Lateral cephalograms taken and casts obtained at baseline and at the end of early treatment were included in the analysis. Two treatment strategies were compared. The first group included removable functional orthopedic appliances only (FOA group), while the second group was treated with removable appliances and with face masks mounted on a cemented maxillary expansion appliance (face mask group). Results: Positive changes were achieved in both groups for overjet (FOA group: ϩ1.3 mm; face mask group: ϩ2.2 mm) and Wits values (FOA group: ϩ0.4 mm; face mask group: 1.7 mm). Moreover, a change in mean ANB values was achieved in the face mask group (ϩ0.9Њ). The FOA group exhibited a reduction in mandibular angles. Changes in maxillary inclination with reduced inclination angles led to increases in overjet and overbite. The face mask group showed dorsal rotation of the mandible with reduced SNB values (Ϫ0.8Њ). Conclusion: Early treatment of prognathism is a meaningful option, as demonstrated by the dentoskeletal (and hence functional) improvements observed in the present study.

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Early Treatment to Correct Class III Relations with or without Face Masks

Godt

Zeyher

Schatz-Maier

et al. 2008

“…[4][5][6][7][8][9] Although a number of studies [10][11][12][13][14][15][16][17] have been published about the pharyngeal airway effects of maxillary protraction, there were conflicting findings. Significant changes for nasopharyngeal [10][11][12]14,15 and oropharyngeal 10,12 airway dimensions after maxillary protraction were reported by some clinicians, whereas the studies by Hiyama et al, 13 Mucedero et al, 17 and Baccetti et al…”

Section: Introductionmentioning

confidence: 99%

Changes in pharyngeal airway dimensions and hyoid bone position after maxillary protraction with different alternate rapid maxillary expansion and construction protocols: A prospective clinical study

Çelikoğlu

Büyükçavuş

2016

Objective: To evaluate the changes in pharyngeal airway dimensions and the position of the hyoid bone after maxillary protraction with different alternate rapid maxillary expansion and construction (Alt-RAMEC) protocols in patients with skeletal class III malocclusion as a result of maxillary retrusion. Material and Methods: The patients with skeletal class III malocclusions were consecutively divided into two groups. Group 1 consisted of 17 patients (11 boys and 6 girls, mean age 11.31 6 1.71 years) who had the Alt-RAMEC protocol for 5 weeks, and group 2 consisted of 17 patients (10 boys and 7 girls, mean age 11.64 6 1.24 years) who had the Alt-RAMEC procedure for 9 weeks. In this study, 4 angular and 13 linear measurements were performed to evaluate the skeletal and pharyngeal airway changes that occurred after maxillary protraction. Results: A significant increase in the maxillary growth, inhabitation of mandibular growth, and clockwise rotation of the mandible caused the improvement of the maxillo-mandibular relationship in both groups. Those changes caused a significant increase in the upper pharyngeal airway dimension (P , .01) and affected the vertical position of the hyoid bone in both groups (P , .05 and P , .01, respectively). However, changes that occurred in both groups were found to be similar for all airway variables (P . .05). Conclusion: Upper pharyngeal dimension and vertical position of the hyoid bone were affected by the maxillary protraction with different Alt-RAMEC protocols. There were no statistically significant differences between the groups. (Angle Orthod. 2017;87:519-525)

“…Clockwise rotation of the mandible, retroclination of the lower incisors, counterclockwise rotation of the palatal plane, and proclination of the upper incisors have been reported also. [4][5][6][7][8][9][10][11][12][13] Many studies have investigated the effects of the MPA on the dentofacial structures and the soft tissues of the face, [1][2][3][4][5][6][7][8][9][10][11][12][13] but only a limited number of studies have been reported on the relationships between maxillary protraction and pharyngeal size.…”

Section: Introductionmentioning

confidence: 99%

Maxillary Protraction Appliance Effect on the Size of the Upper Airway Passage

Oktay

Ulukaya

2008

Objective: To test the hypothesis that maxillary protraction appliances (MPA) have no effect on the size of the upper airway passage and craniofacial structures in adolescent patients. Materials and Methods: Twenty patients (5 male and 15 female; mean age 11.5 years) with skeletal Class III malocclusion were included in this study. The records of all patients who had maxillary protraction treatment and had lateral head radiographs taken before and after their protraction treatments were obtained from the files of treated cases. Treatment changes were determined by means of linear, angular, and area measurements. Data were analyzed statistically by means of paired t-test and correlation analysis. Results: Significant increases were observed in the width and area of the pharyngeal airway. Significant increases also occurred in the sagittal growth of the maxilla, while a clockwise rotation and inhibition of sagittal growth were observed in the mandible. Conclusions: The hypothesis was rejected. The size of the upper airway can be increased by means of MPA application.