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Objective: To find an association between the position of the head and neck and malocclusions in patients of the Universidad Autónoma de Nayarit (México) Orthodontics Specialty. Method: A descriptive, cross-sectional, retrospective and observational study was carried out, taking into account a total of 120 lateral skull radiographs. Results: In class I patients, the craniovertebral angle had an average of 102.05°, the hyoid triangle had an average of -0.63 mm, the C0-C1 distance obtained an average of 7.22 mm and the C1-C2 distance had an average of 4.95 mm. In class II patients, the craniovertebral angle presented an average of 100.02°, the hyoid triangle with -0.52 mm, the C0-C1 distance its average was 7.05 mm and the C1-C2 distance obtained an average of 5.7 mm. In class III patients, the craniovertebral angle presented an average of 101.83°, the hyoid triangle was -0.74, the C0-C1 distance averaged 7.07 mm, and the C1-C2 distance averaged 5.33 mm. Conclusions: Include biomechanical analysis of head and neck posture to obtain a more complete diagnosis. [ABSTRACT FROM AUTHOR]

The great development and progress of Transparent Orthodontics techniques has been possible thanks to biotechnology, based on clinical evidence and efficacy and research studies in bioengineering and software technology, making it possible for these techniques to become authentic Therapeutic Systems, without forgetting that the biology, the physiology, the biophysical, biomechanical, biochemical, bioelectrical concepts, that sustain the Orthodontics, as a specialty within the OdontoEstomatology, remain the same. In the present work, we review the biomechanical principles that support the orthodontic tooth movements necessary for the therapeutic correction of the different malocclusions. [ABSTRACT FROM AUTHOR]

Background. In regard to conditions of the oral cavity in children, malocclusions occur with a prevalence of 60%, whereas the most common speech disorder among school-age children are the changes in pronunciation known as dyslalias, with a prevalence of 70%. The aim of this study was to describe the prevalence of malocclusions and speech disorders in a 4- to 6-year-old preschool population in eastern Mexico City. Methods. We performed an observational, prospective, cross-sectional and descriptive study. Clinical assessment of malocclusion was performed at the base of the terminal planes and the diagnosis of speech disorders was made using the test of Melgar, considering the categories with and without speech disorders. Results. Data were processed using SPSS v.11 and descriptive statistics were obtained from the study variables. The results allowed the observation that the revised total number of preschool-age children, 61% (n = 48) presented malocclusions, whereas speech disorders occurred in 42% (n = 39). In our study, however, no association was demonstrated between malocclusions and speech disorders. Both conditions were present and 40% (n = 19) of preschool-age children showed the presence of malocclusions and speech disorders; 42% (n = 13) had no malocclusions but demonstrated speech disorders. Conclusions. The prevalence of malocclusion and speech disorders in preschool-age children in this community is considered as a health problem. [ABSTRACT FROM AUTHOR]