Effect of Class III bone anchor treatment on airway

Abstract

Objectives: To compare airway volumes and minimum cross-section area changes of Class III patients treated with bone-anchored maxillary protraction (BAMP) versus untreated Class III controls. Materials and Methods: Twenty-eight consecutive skeletal Class III patients between the ages of 10 and 14 years (mean age, 11.9 years) were treated using Class III intermaxillary elastics and bilateral miniplates (two in the infra-zygomatic crests of the maxilla and two in the anterior mandible). The subjects had cone beam computed tomographs (CBCTs) taken before initial loading (T1) and 1 year out (T2). Twenty-eight untreated Class III patients (mean age, 12.4 years) had CBCTs taken and cephalograms generated. The airway volumes and minimum crosssectional area measurements were performed using Dolphin Imaging 11.7 3D software. The superior border of the airway was defined by a plane that passes through the posterior nasal spine and basion, while the inferior border included the base of the epiglottis to the lower border of C3. Results: From T1 to T2, airway volume from BAMP-treated subjects showed a statistically significant increase (1499.64 mm 2015;85:591-596.)

Comparison of short-term effects between face mask and skeletal anchorage therapy with intermaxillary elastics in patients with maxillary retrognathia

“…Similar to this study, many other studies have evaluated skeletal parameters only (16,24), but Angle's Class III molar relationship is also often used to indicate Class III malocclusion (25,26). In this study, Angle Class III molar relationship was not considered as an inclusion criterion because it could be affected by extractions, high vestibule canines, and dental crowding (27).…”

Skeletal Class III malocclusion treatment using mandibular and maxillary skeletal anchorage and intermaxillary elastics: a case report

“…Conventional orthopedic therapy for maxillary protraction (Facemask) is usually performed in early mixed dentition. Treatment results are usually limited and short-lived in patients, and there is a significant chance of relapse and return of reverse overjet once the mandibular growth is finished 14 15 In this case after the conclusion of orthopedic treatment and during the fixed orthodontic treatment, no change in overjet even during PHV could be detected.…”

Comparison of the effects on the pharyngeal airway space of maxillary protraction appliances according to the methods of anchorage

“…Nguyen et al [18]. applied initial force of 100 g on each side and increased force up to 200 g after 1 month.…”

“…Also, there have been studies on the maxillary protraction effects of such facemasks on pharyngeal airway dimensions [16–18]. However, there are few articles comparing the effects of the SAFM and the TBFM on pharyngeal airway dimensions.…”