ABSTRACT
This article presents a non-extraction orthodontic treatment case using mini-screws and a modified palatal anchorage plate (MPAP) to intrude the maxillary posterior teeth, and distalize the whole arch dentition and control the extrusion of the maxillary posterior dentition during distalization.
Subject(s)
Malocclusion, Angle Class II/therapy , Open Bite/therapy , Orthodontic Anchorage Procedures/instrumentation , Orthodontic Appliance Design , Adolescent , Bone Plates , Bone Screws , Cephalometry/methods , Child , Female , Humans , Miniaturization , Tooth Movement Techniques/instrumentation , Tooth Movement Techniques/methodsABSTRACT
The purpose of this study was to compare preferred facial profiles rated by different age groups. An average profile of each gender was constructed from subjects with normal occlusions. Each average profile was located in the centre, and then the lips were protruded or retruded in six 1mm increments in each direction. 70 lay people were divided into 3 groups: young adult (20-39 years); middle-aged (40-54 years); and senior (55-70 years). They were asked to rank their 3 most preferred profiles for each gender. The distribution of the most pleasing profile was compared according to age groups by the Kruskal-Wallis test and according to the rater's gender by the Mann-Whitney U-test. There was a significant difference between the three age groups regarding the preferred male and female profiles (P<0.001). Both the middle-aged and the senior groups tended to select a slightly more retruded lip/flat profile than the young adult group. There was no gender dimorphism in the selection of the preferred profile. The young adult group preferred the straight profile while the middle-aged and senior groups favoured the slightly retruded profile. This may provide useful information for treatment planning in orthodontics and orthognathic surgery.
Subject(s)
Esthetics , Face/anatomy & histology , Lip/anatomy & histology , Adult , Age Factors , Aged , Attitude , Cephalometry/methods , Chin/anatomy & histology , Female , Humans , Male , Middle Aged , Nose/anatomy & histology , Republic of Korea , Young AdultABSTRACT
Quantitative measurements of tumor volume becomes more realistic with the use of imaging- particularly specially when the tumor have non-ellipsoidal morphology, which remains subtle, irregular and difficult to assess by visual metric and clinical examination. The quantitative measurements depend strongly on the accuracy of the segmentation technique. The validity of brain tumor segmentation methods is an important issue in medical imaging because it has a direct impact on many applications such as surgical planning and quantitative measurements of tumor volume. Our goal was to examine two popular segmentation techniques seeded region growing and active contour "snakes" to be compared against experts' manual segmentations as the gold standard. We illustrated these methods on brain tumor volume cases using MR imaging modality.