PULPAL AND PERIODONTAL REACTIONS OF IMMATURE PERMANENT TEETH IN THE DOG TO INTRUSIVE TRAUMA

Pulpal and periodontal tissues of immature incisors of 10 dogs were ra diographically and histopathologically evaluated immediately, 7, 15, 3 0 and 60 days after experimental intrusion induced by mechanical blows . Forty upper central and mesial lateral incisors showing incomplete r oot formation on radiographs were submitted to intrusive force. After the observation periods, the dogs were killed, two at a time. The hemi -maxilas were removed and processed for histopathologic examination. T he traumatized teeth showed accelerated apical formation with reduced radicular length. Pulpal vitality was maintained and the subjacent tis sues did not present irreversible changes. All traumatized teeth re-er upted spontaneously.