RESUMO
The tooth mortality of 400 Egyptian persons aged 15 years and older was studied in terms of missing teeth as well as teeth requiring extraction. The mean number of missing teeth per person was 7.1. A pattern relating actual tooth loss and tooth loss adjusted to take account of teeth needing extraction was observed. Such adjustment increased the mean number of missing teeth per person by about one or two teeth and this difference was constant over the various age groups excepting the oldest category, the mean missing teeth per person increased by about four teeth. The age specific pattern of tooth loss was calculated. The age specific tooth mortality for Egyptian group was consistently less than for people in several western countries
Assuntos
Fatores EtáriosRESUMO
The exploration of the relationship between the bearing of blood groups and caries susceptibility begins with an observation reported by Aitcheson and Carmichael[1] who reported a high percentage of blood group "O" and low percentage of blood group "A" in caries-resistant subjects and the converse in caries-rampant persons. Conflicting results have been obtained from a study of a large group of Chilean children. The study failed to demonstrate an association between ABO and MN blood groups and caries scores. Similar trend was also evident for the ABO an MN blood groups and caries scores relationship in a different age group[3,4 and 5]. On the other hand the study of O'Roark and Leyshon[6] in a group of young adults aged 15-16 year, showed that the MN blood group was associated significantly with increased caries activity. In the present study it was decided to overlook the accepted predisposing factors of dental caries and to investigate the relationship, if any, between blood mutations and dental caries among a group of young adult Egyptian population among whom caries is a less acute problem in comparison with the western populations