Influence of Manual Screwdriver Design in Combination With and Without Predrilling on Insertion Torque of Orthodontic Mini-Implants.

Purpose: The study focused on the influence of screwdriver design in combination with and without predrilling a pilot hole of inner implant diameter on insertion torque of orthodontic mini-implants, controlling for cortical thickness and vertical insertion force as cofactors.

Methods: One hundred twenty mini-implants (Forestadent) of 1.7 mm in diameter and 6 and 8 mm in length were manually inserted into 120 swine rib bone samples.

The Comparison of Malocclusion Prevalence Between Children with Cerebral Palsy and Healthy Children.

This study sets out to examine the prevalence of malocclusion and habits in a group of children with cerebral palsy and to compare it with a control group of healthy children. The presence of an anterior open bite was statistically significantly higher in the cerebral palsied group. The presence of aposterior crossbite was not significantly different between the examined groups, as was the case for a lingual crossbite.

Minor physical anomalies in children with hearing impairment and normal controls.

The aim of this research was to assess differences in the frequency of individual minor physical anomalies (MPA) between healthy controls and children with hearing impairment (HI) and to find out whether some MPAs are more informative in discriminating between two groups than cumulative Waldrop's scores. The aim was also to investigate the influence of gender on MPA in children with HI and those with normal hearing (NH). The study was carried out on a sample of 424 children (121 children with hearing impairment (82 boys and 39 girls) aged from 5 to 18 and 303 healthy schoolchildren with normal hearing (152 boys and 151 girls) aged from 8 to 16).