Artículos de Investigación

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Author: search.filters.author.Fernando Jose DiasLanguage: search.filters.language.English

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    Assessment of Maxillary Premolar Region in Relation to Maxillary Sinus Floor and Buccal Bone Plate: A Cone Beam Computed Tomography Study
    (2019)
    Ramón Fuentes
    ;
    Manuel Arellano Villalón
    ;
    Soto-Faúndez, Natalia
    ;
    Alain Arias
    ;
    Montiel, Ignacio
    The maxillary sinus floor location and the buccal bone plate are factors to be considered in the long-term success with implant treatments mainly in the premolar region. the aim of this study was to establish morphometric characteristics of the buccal cortical bone (BCB) thickness of maxillary premolars and its relation to maxillary sinus floor through CBCT. In this study 350 first and second maxillary premolars were analyzed from 110 CBCT images and the buccal cortical bone (BCB) was measured in a coronal view at the major axis level of each premolar. In addition, in 200 first and second maxillary premolars CBCT images were measured the distance from premolar apex to maxillary sinus floor (MSF) in both frontal and sagittal plane. The type of relationship between the apex and MSF was classified according to Ok et al. (2014). The second premolar was observed with higher values of BCB (p<0.001). In first premolar, higher values were observed in the male sex (p>0.05). In second premolar, only significantly higher values were observed in the male sex in MA-MB-MC (p>0.05). Regarding to MSF and its relation to premolar roots, it was observed that 10 % of the sample was classified as type I, 19 % as type II, 55.5 % as type III and 15.5 % as type IV. The BCB of the upper premolar region is thicker in the apical region and decreases toward the coronal region. Almost 50 % of apex of second premolars are closely and risky related MSF (Type I and II).
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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.
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    Review of the Tanaka Ligament in the Temporomandibular Joint. Analyzing its Scientific Validity
    (2018)
    Ramón Fuentes
    ;
    Fernando Jose Dias
    ;
    Carlos Salamanca Figueroa
    ;
    Borie-Echevarría, Evelyn
    ;
    Ottone, Nicolás Ernesto
    The temporomandibular joint (TMJ) is composed of bony structures, cartilage, capsule, articular disc, synovial membrane and ligaments. Some authors consider the "Tanaka ligament" described in the 1980s by Terry Tanaka as an intra-capsular ligament of the TMJ that unites medially the articular disc and mandibular fossa. The aim of the present study was to analyze the use of the term "Tanaka ligament" in the literature evaluating the scientific support of its existence. A literature review was carried out under the terms "Tanaka Ligament [AND] TMJ" and "Ligamento Tanaka [AND] ATM" (Spanish and Portuguese) in the search engines: MEDLINEPubmed, Science Direct, Google Scholar, LILACS-Bireme and SciELO. Scientific articles and theses were considered in English, Spanish and Portuguese. A total of 1,355 studies were found, summing up the results of all the search engines, of which 8 studies (5 articles and 3 theses) were selected after applying inclusion and exclusion criteria, selection by title, abstract and content. Most of these studies were discarded because they had contents related to the TMJ and/or ligaments wherein an author used the surname "Tanaka", that were not related to the Tanaka ligament. Among the 8 selected studies, 6 of them cite text books, 1 cites a video published by Terry Tanaka and 1 cites a thesis. Most of these textbooks cited also refer to videos by Terry Tanaka and his books. Moreover, most of the anatomical literature does not consider this ligament as an individualized structure. Although there are descriptions of Tanaka's ligament in textbooks, the scientific support of its existence is based only on videos and texts by Terry Tanaka. The dissemination of knowledge associated with this ligament must be cautious, as there is a need for further morphological and functional studies to confirm its existence.