Root resorption of mandibular deciduous canines by Micro-CT

Objectives: The aim of this study was to elucidate root resorption in mandibular deciduous canines in relationship to the development of permanent canines by Micro-CT. Methods: We observed mandibles obtained from the dry skulls of Indian children which were classified into eruption stages by using Micro-CT, and measured distance between the root surface of the deciduous canine and the bony crypt of the canine. Results: In this observation, the bony crypt of the mandibular canine which was situated at the lingual side of the root apex of the mandibular deciduous canine, showed superoinferior growth and moved to distal, lingual side as dental eruption proceeded. When the central incisors and first molars erupted, root resorption was clearly seen and proceeding from the root surface towards the root canal. During this dentition stage, the distance between the root surface of the deciduous canines and the bony crypt of the canines shortened. Conclusions: Micro-CT provided clear evidence that the relationship between growth of the bony crypt of the canines and root resorption in the deciduous canines.