[Research on anatomy of posterior tooth in the Beagle dog and mini-screw implant implantation].

Objective: The morphological characteristics of posterior tooth in the Beagle dog were investigated in order to provide reference to mini-screw implant (MSI) implantation in the root furcation site.

Methods: Seventy posterior teeth of five Beagle dogs were collected and measured as follows: First, the greatest mesio-distal diameter AB of the crown was measured, which was perpendicular to the tooth long axis. Second, mesial cusp of maxillary posterior tooth or central cusp of mandibular was marked as the piont C, and CD which was equal and perpendicular to AB was drawn.