II. Risk factors for crown fractures of permanent incisors in children from Plovdiv.

Aim: The present study considers gender, age, overjet and lip competence as risk factors for children to sustain crown fractures to their permanent incisors.

Material And Methods: A total of 2572 children aged 7-11 years were included in the epidemiological study. They were randomly recruited from the schools in Plovdiv.

I. Prevalence of crown fractures of permanent incisors in schoolchildren aged 7-11 years from Plovdiv.

Unlabelled: The aim of the study was to determine the prevalence of crown fractures of permanent incisors in schoolchildren aged 7-11 years from the town of Plovdiv.

Material And Methods: The present study included 2572 children (1287 boys and 1285 girls) at the age of 7 to 11 years from Plovdiv. A modification of the WHO classification for reporting crown fractures was used.

Reproductive intentions of the newlywed Bulgarian families--artificial neural network approach.

Introduction: The aim of this study was to describe the reproductive intentions of newlywed Bulgarian families, build predictive models of the desired number of children by artificial neural networks (ANN) and compare these models' overall prediction accuracy with conventional statistical analyses.

Material And Methods: Data from a large cross-sectional study on family planning knowledge and habits of newlywed couples from the region of Plovdiv (Bulgaria) in the year 2000 were used. A subset of 17 variables was extracted from the database, in order to construct and train a back-propagation multilayer ANN.