Abstract
BackgroundMaxillary protraction with facemask (FM) is an orthopedic approach for treatment of Class III growing patients. Aim of the present investigation was to analyze tension loads produced by two different facial mask (FM) designs on facial skin of subject with skeletal Class III.MethodsA three-dimensional (3D) geometry of Delaire and Petit FM models were reconstructed from the original Computer Aided Design (CAD) 3D prototype using software package (ANSYS 5.7). A traction load of 9.8 N inclined of 30° to the occlusal plane was applied combining analytical FM models with a 3D facial model. Resulting stresses and deformations on the skin layer were tested through the von Mises yield criterion.ResultsOverall tensions were mostly developed on the chin area, while lower stresses were observed on forehead area for both FM designs. When Delaire FM model was tested, maximum stresses were observed on the upper border of the chin cup corresponding to the inferior lip and to marginal gingiva of lower incisors. After Petit FM application, maximum stresses were more extensively localized at the level of both upper border and central area of the chin. Stresses measured on the chin area were significantly higher with Petit FM when compared with Delaire FM (44 KPa versus 29 KPa, respectively).ConclusionsDelaire FM determined lower stresses and tensile tensions than Petit FM model. Highest tensions were observed at the level of chin cup area for both Delaire and Petit FM. Stresses following Delaire FM application were mostly observed on the upper border of the chin cup, while Petit FM determined stresses more extensively distributed to the central area of the chin.
Highlights
Maxillary protraction with facemask (FM) is an orthopedic approach for treatment of Class III growing patients
Some of the major complications related to maxillary protraction treatment are due to poor adaptation and low fit of FM on the face and to skin irritation determined by the extra-oral cups
When Delaire FM was tested, maximum stresses were observed on the upper border of the chin cup corresponding to the inferior lip and to marginal gingiva of lower incisors (Fig. 3A)
Summary
Maxillary protraction with facemask (FM) is an orthopedic approach for treatment of Class III growing patients. Introduction Face-mask (FM) therapy is the most recommended orthopedic approach for early treatment of skeletal Class III malocclusion [1,2,3,4,5]. Tensile forces are applied on maxillary sutures allowing a forward displacement of the maxilla and an improvement of the sagittal dento-skeletal relationship [6, 7]. Orthopedic therapy requires the Gazzani et al BMC Oral Health (2019) 19:31 sutures. Some of the major complications related to maxillary protraction treatment are due to poor adaptation and low fit of FM on the face and to skin irritation determined by the extra-oral cups. The discomfort in wearing the FM device affects patients’ compliance with negative consequences on treatment effectiveness
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have