title: Endodontic abutments and complete dentures.
abstract: In this in vitro study, 90% of maxillary single-rooted teeth, 89% of maxillary multirooted teeth, 82% of mandibular single-rooted teeth, and 92.5% of mandibular molars had root canals that terminated short of the radiographic root apex. dimensional variability was considerable. Mean measurements provide acceptable levels for underfilling canals and dictate generally applicable levels at which root canal fillings are best terminated. These measurements indicate that, when filling maxillary teeth and mandibular molars, the termination point of the filling should be approximately 0.89 mm short of the radiographic root apex. When filling mandibular single-rooted teeth, the terminal point of the filling material should be approximately 0.69 mm short of the radiographic root apex. Complete overdentures are a valuable alternative to extraction and conventional denture placement. The nonvital teeth that are used for stability, retention, preservation of alveolar bone, proprioception, and psychological support are of critical importance. Failure in endodontic selection and procedure immediately negates the concept of overdentures.
mesh_terms: D000328:Adult; D000368:Aged; D000044:Dental Abutments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D003781:Denture Retention; D003824:Denture, Complete; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012390:Root Canal Therapy / Q000379:methods*; D014092:Tooth Root / Q000033:anatomy & histology