Blood supply in bone and periodontal ligament tissue surrounding mandibular fourth premolars in dogs--a morphological study.

Abstract

In a previous study it was demonstrated that orthodontic movement of lower fourth premolars in a mesial direction, resulted in more resorption on the distal root than on the mesial root. The present study was undertaken in order to determine whether there are differences in the blood supply to the bone and periodontium surrounding the two roots before orthodontic movement, but after extraction of other lower premolars (3P or P3). Histological sections from seven beagle dogs were used. The blood vessel area in the bone and periodontal ligament was measured mesial and distal to the two roots. The results indicate that there is greater vascularity in the bone surrounding the distal root than around the mesial root.