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Bilateral dentoalveolar asymmetries in female patients with adolescent idiopathic scoliosis

Lewandowska Joanna, Opydo-Szymaczek Justyna, Mehr Katarzyna, Głowacki Jakub

Acta of Bioengineering and Biomechanics

2019

Vol. 21, no. 4

53--62

The aim of this cross-sectional research was to quantify left–right dentoalveolar fluctuating (FA) and directional asymmetries (DA) in patients with adolescent idiopathic scoliosis and to assess the relationship between these asymmetries and the side, location, and severity of scoliosis. Materials and methods: The study group comprised of 60 females aged 12–16 years, with idiopathic scoliosis, and 54 healthy controls. Measurements were made with the use of digital caliper on full-mouth dental casts. The following variables were measured from each subject: a shift of the incisor midline, left and right incisor overjet, deviation of canine and buccal segment relation as well as maxillary and mandibular arch chords. The data were statistically analyzed with significance taken as p < 0.05. Results: Statistically significant differences in the mean shift of the incisor midline, buccal segment relation on the left and canine deviation on the left between the control group and the study group were detected ( p = 0.0419, p = 0.0.458 and p = 0.0204, respectively). FA of the midline deviation and canine deviation were statistically significantly higher for subjects with IS, compared to healthy controls ( p = 0.0315 and p = 0.0415, respectively). Neither direction of the curve nor apical vertebra’s location or apical translation significantly affected the magnitude of dentoalveolar asymmetries. Conclusions: Our results confirmed that bilateral asymmetries are a common feature of the young females’ occlusion. Individuals with IS show higher tendency to Angle Class II malocclusion, as well as higher FA of incisor midline discrepancy and canine deviation, compared to the controls.

An attempt to speed-up the examination of saccadic reaction time

Witkowska D., Ober J.

Biocybernetics and Biomedical Engineering

2012

Vol. 32, no. 3

79-94

One of possible ways to speed-up the prosaccadic latency examination is applying the target walk paradigm. The authors describe the physiological phenomena involved in carrying such paradigms, which may affect latency time and which should be balanced in this kind of task. Thirteen subjects were examined applying the newly designed target-walk paradigm and for comparison the standard prosaccade task. A significant reduction of the saccadic latency (p < 0.0l) was found on average by 21 ms, which probably resulted from an increased saccadic decision urgency forced by the new test design. Another reason can be different ways of capturing of the subject's attention achieved in this task.