Impacted Teeth under a Dental Prosthesis
When a patient has an edentulous area restored, there are several reasons that impacted teeth in the area should be removed before the prosthetic appliance is constructed. After teeth are extracted, the alveolar process slowly undergoes resorption. Thus the impacted tooth becomes closer to the surface of the bone, giving the appearance of erupting. The denture may compress the soft tissue .on the impacted tooth, which is no longer covered with one; the result is ulceration of the overlying soft tissue and initiation of an odontogenic infection (Fig. 9-8). Impacted teeth should be removed before prosthesis is constructed because, if the impacted tooth must be removed after construction, the alveolar ridge may be so altered by the extraction that the prosthesis becomes unattractive and less functional (Fig. 9-9). In addition, if removal of impacted teeth in edentulous areas is achieved before the prosthesis is made, the patient is
probably in good physical condition. Waiting until the overlying bone has resorbed and ulceration with infection occurs does not produce a favorable situatio-n for extraction. If extraction is postponed, the patient will be older and more likely to be in poorer health. Furthermore, “the mandible mayhave become atrophic, which increases the likelihood of fracture during tooth removal (Fig. 9-10). ‘ -.
HG. 9·6 Root resorption of second molar as result of impacted third molar.
FIG. 9-7 Root resorptiori of maxillary lateral incisors as result of