منابع مشابه
formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
15 صفحه اولThe Lower Canine Tooth
Odontogenic infection may be dangerous; especially when life-threatening complications occur. Infection spreads through the bone and periosteum toward nearby or more distant structures and spaces. Canine fossa abscess is an odontogenic infection that can lead to life-threatening complications. Successful treatment requires early recognition, determination of etiological factors, and proper medi...
متن کاملTooth microstructure tracks the pace of human life-history evolution.
A number of fundamental milestones define the pace at which animals develop, mature, reproduce and age. These include the length of gestation, the age at weaning and at sexual maturity, the number of offspring produced over a lifetime and the length of life itself. Because a time-scale for dental development can be retrieved from the internal structure of teeth and many of these life-history va...
متن کاملDetermination of the centre of resistance in an upper human canine and idealized tooth model.
The purpose of this investigation was to analyse the influence of geometric and material parameters of a human canine on initial tooth mobility, and the stress and strain profiles in the periodontal ligament. While the material parameters of tooth and bony structures are known within an uncertain limit of approximately a factor of 10, values reported for the elasticity parameters of the periodo...
متن کاملHuman Evolution Inferred from Tooth Growth and Development
To study human evolution [4], researchers sometimes use microstructures found in human teeth and their knowledge of the processes by which those structures grow. Human fetuses begin to develop teeth in utero. As teeth grow, they form a hard outer substance, called enamel, through a process called amelogenesis. During amelogenesis, incremental layers of enamel form in a Circadian rhythm. This rh...
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ژورنال
عنوان ژورنال: American Anthropologist
سال: 1971
ISSN: 0002-7294,1548-1433
DOI: 10.1525/aa.1971.73.3.02a00100