#$%^&*AU2018201058A120190829.pdf#####20 ABSTRACT A method for preserving the alveolar ridge using partial extraction therapy. The method comprises de-coronating the tooth to leave a tooth root, de-coring a coronal portion of the tooth root to leave a tooth ring, severing an apical root portion of the tooth root from the tooth ring and removing the apical root portion. The tooth ring provides a ring of natural material that reinforces the coronal part of the tooth socket in the gum and reduces or obviates alveolar resorption.37a 35 41 33 39 FIG. 11B FIG. 11B.1 FIG. 11C
