Occlusion on implants---Is there a problem? / 实用口腔医学杂志

Oral rehabilitation restores form and function and impacts on general health.Teeth provide a discriminating sense of touch and directional specificity for occlusal perception,management of food with mastication and swallowing,and awareness of its texture and hard-ness.Peripheral feedback for control of jaw muscles includes the enamel-dentine-pulp complex and mechanoreceptors in the periodontal tis-sues.The implications of feedback from periodontal and other intra-oral mechanoreceptors as well as changes in central representation are significant for function and adaptation to oral rehabilitation.With implants,in the absence of the periodontium and periodontal mechanore-ceptor feedback,fine motor control of mastication is reduced,but patients are still able to function adequately.Further,there is no signifi-cant difference in function with full-arch fixed prostheses on teeth in comparison with implants.Predictable implant outcomes depend on bone support.Optimum restoration design appears to be significant for bone remodelling and bone strains around implants with occlusal loading. Finite element analysis data confirmed load concentrations at the coronal bone around the upper section of the implant where bone loss is com-monly observed clinically.Load concentration increased with steeper cusp inclination and broader occlusal table and decreased with central fossa loading and narrower occlusal table size.It is recommended that occlusal design should follow a narrow occlusal table,with central fossa loading in intercuspal contact and low cusp inclination to minimise lateral loading in function and parafunction.Acknowledging these features should address potential problems associated with the occlusion in implant therapy.

Estudio descriptivo de forma y función del juego libre del niño(a) en etapa preescolar / Descriptive study of the form and function of the unstructured play of the child in pre-school stage

La investigación tiene como principal objetivo conocer la forma y función del juego libre de 7 niños (as) en etapa de transición (4 a 5 años) de la ciudad de Punta Arenas, considerados en establecimientos educacionales pre-escolares en la región de Magallanes y Antártica Chilena. Bajo los fundamentos teóricos de la ciencia de la ocupación, se pretende identificar, a través del juego libre, aspectos relevantes de la conducta del menor, que favorezcan o dificulten su desempeño escolar. La metodología usada es de carácter cualitativo, siendo su método el estudio de caso. Los principales resultados demuestran similitud en la función del juego libre de cada niño(a), siendo estos predominantemente motor-social, los cuales repercuten en su desempeño escolar. Se concluye que, cada juego significa un momento para el aprendizaje y, como herramienta diagnóstica, entrega la posibilidad de visualizar ciertas conductas adaptativas en los niños(as) o, por el contrario, determinar signos de alerta según su edad de desarrollo.

The objective of the this research is to investigate the form and function of the unstructured play of seven children in transition stage (4 to 5 year-old) in the city of Punta Arenas. The children considered in this study are from preschool educational institutions living in the region of Magallanes and the Chilean Antartica. Under the theoretical foundations of occupational science it is expected to identify the relevant aspects of the children’s behavior in unstructured play, especially those that may help, or having negative effects in the school performance. The methodology used in this case is qualitative, being its method the case study. The main results demonstrate similarities regarding the functions of the children’s unstructured play, being these mainly “motor-social” functions that have an effect in the school performance. It can be concluded then, that unstructured play helps to develop the children’s learning strategies. It can be used as a diagnosis tool because it permits the observation of adaptive behaviors in children, and also allows determining signs of alert considering the child’s age of development.

TONGUE THRUST HABIT - A review.

There is interrelation ship between the form and function. The different abnormal habits may effect the form of orofacial structures. The presence of one oral habit may induce the other. In this review article a new induction chart is prepared to show the interrelation between different abnormal habits and their effect on form. The chart also in turn explains how form can lead to development of different habits. Thus there is interrelation ship between form and function.