Artículos de Investigación

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Author: search.filters.author.will be referenced::ORCID::0000-0002-8869-7601Language: search.filters.language.English

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    Analysis of mandibular movements and chewing cycles in patients with Skeletal Class III: a preliminary study using 3D electromagnetic articulography
    (2018)
    Ramón Fuentes
    ;
    Diana Constanza Farfán Melo
    ;
    Fernando J. Dias
    ;
    Alain Arias-betancur
    ;
    María Florencia Lezcano
    Background. Study of mandibular movements (MM) was introduced into oral physiology to increase knowledge of the stomatognathic system and achieve better results in treatments. Electromagnetic Articulography (EMA), specifically the most recent equipment, AG501, plays an important role in these objectives, since it permits description of movements in 3 dimensions by recording the position of body parts at a high sampling frequency. Aim. The aim of the present study was to report an exploratory analysis of the geometrical characteristics (area, trajectory, ranges) and the velocity of border and functional MM in patients with Skeletal Class III by the use of EMA AG501. Material and methods. Two individuals with skeletal class III, patients at the Dental Teaching Clinic of the Dental Faculty of Universidad de La Frontera, Chile, were assessed and the results were processed with computer scripts developed specifically for this study. Results. The result produced from border MM was Posselt's envelope in the frontal and sagittal planes, allowing analysis of the morphology and area. The result obtained from the mastication movements was an assessment of the area of each chewing cycle, which was compared with the area of the envelopes in the various planes. We also analysed the number, frequency and velocity of cycles, comparing them with available data.
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    Morphological variations of the mandibular canal in digital panoramic radiographs: a retrospective study in a Chilean population
    (2018)
    Ramón Fuentes
    ;
    Alain Arias-betancur
    ;
    Constanza Farfán
    ;
    Nicolás Astete
    ;
    Ivonne Garay
    Background: Morphological variations of the mandibular canal (MC) have been described in literature, so the clinician must be able to recognise them and adapt their treatment accordingly. The aim of this study was to determine the prevalence of morphological variations of the MC using digital panoramic radiographs (DPR) of Chilean patients. Materials and methods: A retrospective study in which 1400 DPR were analysed to identify cases of bifid, trifid and retromolar MC. The radiographs were analysed independently by two examiners who had previously been trained by a specialist in oral and maxillofacial radiology. Inclusion and exclusion criteria were applied to reach a final sample. Results: Nine hundred and twenty-five radiographs were included (599 female, 326 male; mean age 36.1 ± 15.54 years). The prevalence of bifid MC was 11% (n = 102), with no significant differences by sex (p = 0.069). Proportion of bifid MC was higher among younger patients (p = 0.038). Prevalence of morphological variations of type 1 bifid MC was 7.4% (n = 69), type 2 was 2.3% (n = 23), type 3 was 0% (n = 0) and type 4 was 1.1% (n = 10). Prevalence of retromolar canal was 0.9% (n = 8), with no significant differences by sex (p = 0.893) or age (p = 0.371); of these, 2 (0.2%) cases were forward type and 6 (0.6%) cases were retromolar type. No cases of trifid MC were found. Conclusions: Digital panoramic radiographs are useful for detecting morphological variations of the MC; we were able to identify three types of bifid MC as well as retromolar canals. Proper identification of these variations by an easily accessible examination is important for avoiding possible complications in clinical-surgical practice. (Folia Morphol 2019; 78, 1: 163–170)