混合牙列前牙开合横向的骨骼特点.pdfVIP

Original Article Transverse Dentoskeletal Features of Anterior Open Bite in the Mixed Dentition A Morphometric Study on Posteroanterior Films a b c Fabiana Ballanti ; Lorenzo Franchi ; Paola Cozza ABSTRACT Objective: To apply both conventional cephalometric analysis and morphometric analysis (thin- plate spline analysis) to posteroanterior (PA) cephalograms to test the hypothesis that the den- toskeletal features of subjects with anterior open bite in the mixed dentition are no different from those of normal controls. Materials and Methods: A group of 22 white subjects (6 males, 16 females; mean age, 8.7 0.7 years) with anterior open bite (AOBG) was compared with a control group (CG) of 22 white subjects (11 males, 11 females; mean age, 9.2 0.8 years) with Class I occlusal relationships, and without anterior open bite and sucking habits. Subjects of both groups were in the mixed dentition and had no history of orthodontic treatment. Between-group statistical comparisons were performed with independent sample t-tests and permutation tests. Results: AOBG exhibited statistically significant shape differences with respect to CG that con- sisted of a transverse contraction of the zygomatic region, of the maxilla (at both skeletal and dentoalveolar levels), and of the mandible (in both condylar and gonial regions), with a downward dislocation of point menton. With conventional cephalometrics, AOBG showed a statistically sig- nificant transverse defic