Artículos de Investigación

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Author: search.filters.author.Diana Constanza Farfán MeloSubject: search.filters.subject.Medical and Health sciences

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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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    Delayed Diagnosis of a Supernumerary Tooth in an Adult Patient: Treatment Considerations As Regards One Case
    (2018)
    Ramón Fuentes
    ;
    Diana Constanza Farfán Melo
    ;
    Nicolás Astete Sepúlveda
    ;
    Nallely Ivonne Garay Arce
    ;
    Fernando Jose Dias
    (Background) Hyperdontia is an excess in the total number of teeth and if their morphology resembles a normal tooth, they are called supplementary teeth. Its etiology is not yet understood in its entirety but there are several hypotheses on the matter. (Aim) In this case report, we present the accidental finding of a supernumerary tooth in a 57-year-old woman through a digital panoramic x-ray and we discuss its approach. (Material and Methods) When the computed cone beam tomography was requested, the tooth was characterized with morphometric measurements. (Results) The mesiodens, small, with a conical crown and curved root, was observed in a palatal position relative to teeth 1 1 and 1 2, in distoversión (its crown was in contact with the root of tooth 1 2). It is noted slight root resorption and discontinuity of the palatal alveolar cortex. The cortex of the nasal cavity and the alveolar vestibular cortex were preserved. In this context, it was decided to maintain the supernumerary tooth and observe its evolution every 3 years. This approach was based on the fact that throughout the intraosseous progression of the tooth, it has never caused symptoms or complications for the patient. In addition, the benefits of extraction are not so clear. (Conclusion) As a rule, supernumerary teeth are extracted early to avoid possible complications; however, in cases like this, the treatment decision must be based on adequate clinical and imaging examinations, complemented by a risk-benefit analysis of the treatment, and considering the patient’s desires.
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    Application of 3D electromagnetic articulography in dentistry: Mastication and deglutition analysis. Protocol report
    (2018)
    Ramón Fuentes
    ;
    Fernando Jose Dias
    ;
    Giannina Álvarez
    ;
    Lezcano, María Florencia
    ;
    Diana Constanza Farfán Melo
    The Stomatognathic System (SS) is an integrated and coordinated morphofunctional unit, consisting of skeletal, muscular, angiological, nervous, glandular and dental structures that work in harmony to perform different functions such as chewing, swallowing, speaking, breathing, tasting and esthetics. The study of SS physiology is crucial to achieving a correct maintenance of its normal function or restoration. Thus, we developed a protocol to record mandibular movement, chewing and swallowing (saliva and water) by using the 3D-electromagnetic articulograph AG501 at the Oral Physiology Laboratory of the Research Centre for Dental Sciences (CICO). This tool has been used for decades in speech and phonetic research and it is able to record, present and evaluate articulated structure movement data in real time. The articulograph provides an ordered data matrix (values for the x, y, z axes, among others) for the recorded movement, which is stored in binary files that can be processed by different software. One of these is MATLAB¨, allowing us to perform a quick, clear and understandable analysis. The existence of a standardized methodology for recording allows an accurate description of the stages to perform different types of measurements according to the researcherÕs objective. This has opened the way for a new type of oral physiology analysis based on study reproducibility, which is considered one of the bases of scientific methodology.