Longitudinal evaluation of jaw muscle activity and mandibular kinematics in young patients with Class II malocclusion treated with the Teuscher activator

Objectives: A longitudinal study was performed to evaluate the jaw muscle activity and mandibular kinematics after Teuscher activator treatment and at 2 years after orthodontic treatment completion. Material and Methods: Twenty-seven children with Class II division 1 malocclusion were evaluated before treatment (T0; mean: 11.6 years), after functional treatment (T1; mean: 12.8 years), and 2 years after orthodontic treatment (T2; mean: 18 years). Bilateral surface electromyographic activities of the anterior temporalis, posterior temporalis, masseter, and suprahyoid muscle areas were analyzed at rest and during clenching, swallowing, and mastication. Kinematic recordings of the mandibular maximum opening, lateral shift, right and left lateral excursions, and protrusion were evaluated. Results: Compared to T0, the left masseter activity during clenching was decreased at T1 but increased at T2, similar to the other evaluated muscles. The suprahyoid activity during swallowing was increased at T1 but decreased at T2. The masseter activity during mastication was increased at T1 and further increased at T2. The left and right lateral excursions and protrusion did not show significant changes throughout the experiment. Conclusions: Teuscher activator and subsequent fixed orthodontic treatment improved jaw muscle function; however, a long period was needed to attain complete neuromuscular adaptation

Surface electromyographic evaluation of jaw muscles in children with unilateral crossbite and lateral shift in the early mixed dentition: sexual dimorphism

Objectives: To examine the activity of jaw muscles at rest and during maximal voluntary clenching (MVC) in children with unilateral posterior crossbite (UPXB) and functional lateral shift in the early mixed dentition and to evaluate sex differences. Material and Methods: The sample included 30 children (15 males, 15 females) aged 6 to 10 years old, with UPXB and functional mandibular lateral shift (>=1.5 mm) in the early mixed dentition. sEMG activity coming from the muscle areas (anterior temporalis [AT], posterior temporalis [PT], masseter [MA] and suprahyoid [SH]) were obtained from both the crossbite (XB) and noncrossbite (NONXB) sides at mandibular rest position. sEMG acti- vity of the bilateral AT and MA muscles sides was obtained during MVC. Asymmetry and activity indexes were calculated for each muscle area at rest and during MVC; the MA/TA ratio during MVC was also determined. Results: At rest, no differences were found between sexes for any muscle areas or asymmetry and activity indexes. No differences were found between XB and NONXB sides. During MVC, however, significant sex differences were found in AT and MA activity, with higher sEMG values in males than in females, on both XB and NONXB sides. Asymmetry indexes, activity indexes and MA/AT ratios did not show significant differences between the sexes. Activity was symmetric both in males and in females. Conclusions: At rest, no sex differences were found, but during MVC males showed higher activity than did females in both XB and NONXB AT and MA muscle areas. Muscular activity was symmetrical at rest and during MVC in both sexes. Sexual dimorphism should be considered in the diagnosis and treatment of UPXB and lateral shift in the early mixed dentition

Electromyographic activity of the jaw muscles and mandibular kinematics in young adults with theoretically ideal dental occlusion : reference values

A necessary step to use neuromuscular analysis as diagnostic tool is to establish normal reference values for the physiological range in a healthy population. Surface electromyographic (sEMG) activity of the jaw muscles and mandibular kinematics were measured in young adults with theoretically ideal dental occlusion to determine normal reference values during different tasks. Differences between the sexes were evaluated. Forty young adults (20 men, 20 women; mean age 22.8 ± 3.9 years) with theoretically ideal dental occlusion were selected using very restrictive criteria. sEMG activity of the anterior temporalis (AT), posterior temporalis, masseter (MA), and suprahyoid muscles were evaluated in the rest position and during swallowing, mastication, and clenching. Mandibular kinematics in the rest position and during maximum excursions were assessed. Asymmetry, activity, and torque indices and MA/AT ratios were calculated. For all muscles, sEMG values were 1.01-3.57 µV at rest, 3.50-10.85 µV during swallowing, and 41.04-86.59 µV during mastication. During clenching, values were 230.08-243.55 µV for the AT and MA muscles. Mean total asymmetry, activity, and torque indices at rest were 20.34 %, -15.04 %, and 19.02 %, respectively; during clenching, these values were 6.14 %, -2.62 %, and 4.46 %. MA/AT ratios were near 1. Kinematic measurements during lateral excursion, protrusive and maximum opening were 7.54, 8.44, and 37.38 mm respectively; lateral mandibular shift was 1.41 mm; free way and lateral displacement at rest were 1.40 and 0.26 mm. Right MA activity during mastication and clenching was higher in men than women. Reference values for sEMG activity and mandibular kinematics were determined. Some muscular asymmetry and torque were observed

Multi-stakeholder contribution to the identification of a core outcome set and measurements in implant dentistry (ID-COSM initiative) using the Delphi methodology

AIM: To obtain input from multiple stakeholders and generate agreement on essential outcomes in implant dentistry using the Delphi methodology and incorporate them into an international consensus defining a core outcome set. MATERIALS AND METHODS: Candidate outcomes in implant dentistry were generated from scientific evidence through five commissioned systematic reviews and from people with lived experience in dental implants (PWLE) through four international focus groups. A steering committee identified stakeholders among representatives from dental professionals, industry-related experts and PWLE. Participants underwent a three-round Delphi survey using a multi-stakeholder approach; they assessed candidate outcomes and additional outcomes identified in the first Delphi round. The process followed the COMET methodology. RESULTS: From the 665 potential outcomes identified in the systematic reviews and 89 in the PWLE focus group, the steering committee selected 100 and organized them into 13 categories, to be included in the first-round questionnaire as candidate outcomes. A total of 99 dental experts, 7 dental-industry-related experts and 17 PWLE participated in the first round, and 11 additional outcomes were added to the second round. There was no attrition between the first and second rounds, where 61 (54.9%) outcomes exceeded the pre-established threshold of agreement. PWLE and experts participated in the third round that applied "a priori" standard filters to distil a list of candidate essential outcomes. CONCLUSION: This Delphi study utilized a standardized, transparent and inclusive methodology and preliminarily validated 13 essential outcomes organized into four core areas. These results informed the final stage of the ID-COSM consensus

Effect of antibiotic prophylaxis for preventing infectious complications following impacted mandibular third molar surgery. A randomized controlled trial

The objective of this study was to determine the effect of antibiotic prophylaxis in preventing postoperative infections after extraction of impacted mandibular third molars. A Parallel-group, randomized, blind, placebo-controlled trial was performed. 154 patients were randomly allocated to 2 groups; experimental (n=77) receiving 2g amoxicillin 1 hour prior to surgery and control (n=77) receiving placebo. Primary outcome was postoperative infections and secondary outcome was the need for rescue analgesia. 4.5% of patients developed postoperative infections, five patients of the control group (4 alveolar osteitis, 1 surgical site infection) and two of the experimental group (1 alveolar osteitis, 1 surgical site infection). Difference between groups was not statistically significant, RR=0.4 (95%CI 0.08-1.99, ?=0.41) NNTB=26. Rescue analgesia intake was significantly higher in the control group (41 vs 18 patients of experimental group) RR=0.49 (95%CI 0.32-0.75, ?<0.05) NNTB=3. The use of 2g amoxicillin 1 hour before surgery was not effective in significantly reducing the risk of postoperative infections from impacted mandibular third molars extraction, when compared to placebo. Nevertheless, antibiotic prophylaxis was associated with a reduced need for rescue analgesia

Longitudinal evaluation of sEMG of masticatory muscles and kinematics of mandible changes in children treated for unilateral cross-bite

a b s t r a c t The aim of this study was to evaluate masticatory muscle activity and kinematics of mandible changes in children with unilateral posterior cross-bite (UPXB) after orthodontic treatment, and one year after retention. Twenty-five children with UPXB and functional mandibular shift were evaluated before treatment (mean age 12.5 years), after treatment (mean age 14.9 years), and one year after retention (mean age 16.8 years). The same data were collected in a control group of thirty age-matched normocclusive children. Simultaneous bilateral surface electromyographic (sEMG) activity from anterior temporalis (AT), posterior temporalis (PT), masseter (MA), and supra-hyoid (SH) muscle areas were evaluated at rest, during swallowing, mastication and clenching. Kinematic records of rest position, mandibular lateral shift, swallowing and mastication were analyzed. Results showed a lateral shift of the mandible present at rest. During swallowing, sEMG activity of SH predominated before and post-treatment and retention. High frequency of immature swallowing was maintained post-treatment and retention. During mastication, MA activity increased significantly and its asymmetry was corrected post-treatment. During clenching, cross-bite side AT and MA activity increased significantly posttreatment and remained stable after retention, and MA/AT ratio reversed. These findings reinforce the advantages of treating children with UPXB and functional shift as early as possible

Vive la música 1. Proyecto curricular, y guía didáctica y de recursos : primer ciclo de educación primaria

Material curricular elaborado según el proyecto editorial supervisado por el Ministerio de Educación y Ciencia y aprobado por Orden Ministerial de 29 de enero de 1993Se presenta un proyecto curricular de educación musical para el área de educación artística del primer ciclo de educación primaria desde una perspectiva globalizadora e integradora. Tras la fundamentación y contextualización psicopedagógica y didáctico-metodológica del proyecto se ofrecen numerosos recursos que contribuyen a facilitar el proceso de aprendizaje, dentro de la diversidad del alumnado, incidiendo en el desarrollo de capacidades cognitivas. Se han estructurado en seis unidades didácticas para cada curso del primer ciclo, conformadas en bloques didácticos entre los que existe interrelación. En cada unidad se concretan sus objetivos didácticos y contenidos conceptuales, procedimentales y actitudinales secuencializados y articulados. Igualmente, se han establecido conexiones interdisciplinares con el resto de las áreas curriculares y con los temas transversales. La metodología utilizada es fundamentalmente lúdica y basada en actividades recurrentes para facilitar los aprendizajes. Las actividades y propuestas de cada unidad ofrecen datos suficientes para realizar una evaluación continua y formativa .CataluñaBiblioteca de Educación del Ministerio de Educación, Cultura y Deporte; Calle San Agustín, 5; 28014 Madrid; Tel. +34917748000; [email protected]

Applied research in didactics of music and the curriculum of Primary Education

Desde el año 1990 estamos inmersos en una reforma educativa, por lo que consecuentemente con sus postulados, será ineludible "reformar" o cambiar los métodos en función de los procesos de enseñanza aprendizaje. En el marco general del Currículo de Educación Primaria se establecen unos principios psicopedagógicos en los que deberá fundamentarse toda acción docente, por tanto consideramos de suma importancia el que nuestra actividad en el campo de la investigación aplicada sea convergente con los mismos, encontrando en ellos la fundamentación necesaria para modificar y reformar las anteriores "formas de hacer" en el campo de la didáctica. Algunos de los rasgos característicos de este nuevo planteamiento curricular en los que hemos centrado nuestras investigaciones, dado que deben estar presentes en el marco de todas la áreas curriculares entre las que se encuentra el área de Educación Artística, son los siguientes: Concepción constructivista del aprendizaje y de la enseñanza; la actividad lúdica como principio fundamental en este nivel educativo; el alumno y la alumna como sujetos activos de la educación, los ámbitos perceptivo y expresivo.Since the year 1990 we are immersed in an educational reform, and consequently with its postulates, it will be inescapable to "reform" or change the methods according to the teaching-learning processes. In the general framework of the Primary Education Curriculum establishes psycho-pedagogical principles on which all teaching action should be based, therefore we consider it of utmost importance that our activity in the field of applied research is convergent with them, finding in them the Necessary basis for modifying and reforming the previous "ways of doing" in the field of didactics. Some of the characteristic features of this new curricular approach in which we have focused our researches, given that they must be present in the framework of all the curricular areas among which is the area of ??Artistic Education, are the following: Constructivist conception of learning And teaching; Ludic activity as a fundamental principle in this educational level; The student and the student as active subjects of education, the perceptive and expressive fields