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Dental wear is an irreversible loss of dental hard tissues under the action of physical and chemical factors that may come from the external or internal environment of the body. Dental wear is the consequence of three mechanisms: biocorrosion, friction and stress. The purpose of the study was to determine the impact of risk factors on the severity of erosive dental wear in children using factorial analysis. In this context, we used data from a statistical survey conducted between 2017-2018 on 456 rural and urban children aged 6 to 11 years, where dental wear was analyzed according to a series of diet-related factors, oral hygiene and behavioral patterns (bruxism). The major impact was caused by energy drinks, yoghurt and carbonated beverages. Through the associations resulting from the factorial analysis, the mechanisms involved in the erosive dental wear were also highlighted, and the main was biocorrosion, followed by friction and stress.

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This paper presents a new conception and analyzes a hyperredundant continuous robot (continuous style manipulator), drive system, and control strategy. The robot includes ten flexible segments and can be extended to several components as needed. The chosen hyper-redundant robot has a continuous infinite hybrid structure (HHRIC), based on hydraulic control with a rheological element. This system combines the advantage of a joint-level drive with a lightweight construction similar to the base-driven robots. It is suitable for tasks such as wiring in hard-toreach areas (caves, subaccounts, steep areas), transportation of fluids or food to areas affected by natural disasters (people buried under ruins), exploration in difficult areas (speleological research). Generally, the control algorithms for hyper-redundant robots are specific to the robots’ constructive particularities to which they have applied and the environment in which they operate. Experimental results validate the proposal robot design and control strategies in virtual reality. As a result, it is concluded that hyper-redundant robots and immersive technologies should play an essential role soon in automated and teleoperation applications.

Abstract:This paper analyses the communications and social structure of whale pods and tries to apply their principles on cooperative robot structures which can be guided to perform a certain task. The communication patterns and social structure are presented at first in order to define real, natural phenomena which can then be translated through cooperative robotic structures. Whale communication has suffered modifications in the latter years mostly because of the increase of noise in the ocean. Problems regarding communications between the cooperative structures chosen for modelling whale behavior are solved by data fusion techniques. In the last part of the paper the problem of dynamic compensation of disturbances is studied with regard to cooperative structures.