Stabilographic examinations of the crewmembers of the orbital station Salyut-4 demonstrated that one of the most characteristic manifestations of posture-tonic deconditioning induced by a prolonged exposure to weightlessness was an emergence of high-frequency oscillations (with a cycle of 0.1--0.15 sec) of the common center of body gravity, the fraction of the oscillations decreasing during the first weeks of the postflight period. After flight all the crewmembers showed signs of postural hypotension: an increase in the cardiac rhythm and a decrease in the pulse arterial pressure.
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BMC Oral Health
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Faculty of dentistry, Ain Shams University, Cairo, Egypt.
Objective: The purpose of this study was to evaluate the effect of different preparation depths (0, 2 and 4 mm) of different restoration designs (classic endocrown design versus overlay design) on marginal adaptation of restorations fabricated of two different restorative materials (lithium disilicate and PEEK).
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Sanitary Engineering Laboratory, Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, 9 Iroon Polytechniou St., Zographou Campus, 15773, Athens, Greece.
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