External cervical resorption (ECR) describes the loss
of dental hard tissue beginning at the cervical region of
the root surface as a result of odontoclastic action.
Studies have shown a prevalence of post traumatic
injuries to permanent teeth that range from 3.9% to 58.6%.
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https://medwinpublishers.com/OAJDS/OAJDS16000221.pdf
Kindly follow the link for full length article
https://medwinpublishers.com/OAJDS/OAJDS16000221.pdf