Luis Huanca Ghislanzoni; Roberta Lione; Lorenzo Franchi; Paola Cozza
Abstract
Background: The effects of rapid maxillary expansion (RME) have been widely studied with classic bidimensional imaging.Objectives: The study aimed to determine immediate post-expansion effect of RME with three-dimensional imaging.Methods: Computed tomography (CT) low dose scan records were taken for ...
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Background: The effects of rapid maxillary expansion (RME) have been widely studied with classic bidimensional imaging.Objectives: The study aimed to determine immediate post-expansion effect of RME with three-dimensional imaging.Methods: Computed tomography (CT) low dose scan records were taken for three patients before applying RME (T0), and immediately after the end of the active expansion phase (T1). For one patient a CT scan was available also at T2, at time of RME removal. Image analysis was done in 4 steps: segmentation of the face skull, model construction and exportation of .stl surface shells, cranial base superimpositions and colorimetric maps overlay. Results: There were differences in the bone adaptations to RME, but it was possible to identify some common trends in the three patients. All of the three patients showed a pattern of forward movement of the maxilla associated to the suture opening. Patients 1 and 3 demonstrated also a downward movement of the maxilla, which was not visible on patient 2. As a sagittal advancement of almost 6 mm, as visible in patients 1 and 3, was not possible due to growth in only two weeks, all bony changes could be attributed to the RME. For patient 1, the bony changes present at T1, were still present at T2, while the suture was closed.Conclusions: A pattern of forward immediate displacement of the maxilla with respect to the cranial base was consistently noticed in three patients. The vomer bone maintained a connection with one half of the maxilla when the suture opened.
Luis Huanca Ghislanzoni; Frederick Berardinelli; Costanza Tagliatesta; Alessandra Lucchese
Abstract
Introduction: Mesiodens is the most common type of supernumerary tooth with proportion of males: females of 2: 1. The etiology of this anomaly is various and includes both genetic and environmental factors, syndromic conditions and disturbances in dental development.Case Presentation: A palatally positioned ...
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Introduction: Mesiodens is the most common type of supernumerary tooth with proportion of males: females of 2: 1. The etiology of this anomaly is various and includes both genetic and environmental factors, syndromic conditions and disturbances in dental development.Case Presentation: A palatally positioned maxillary midline mesiodens was incidentally found during x-ray check-up in a 14-year-old female. It was associated with major crowding and a huge upper midline shift. The oral surgeon did not deem prudent a surgical access due to crowding. Patient was treated with screw-borne active anchorage, all four first bicuspids extracted, braces bonded on both arches and consequent mesiodens surgery removal. After alignment a safe palatal surgical access was available. Satisfactory functional and esthetic results were achieved and stable at a 2-year follow-up.