Morphologic Characteristics of Bony Edentulous Jaws
- 14 March 2007
- journal article
- Published by Wiley in Journal of Prosthodontics
- Vol. 16 (2), 141-147
- https://doi.org/10.1111/j.1532-849x.2007.00165.x
Abstract
Purpose: The objective of this study was to examine bone tissue characteristics of edentulous arches and residual ridges in different regions of the human jaws. Materials and Methods : For the study, 24 maxillary and 99 mandibular completely edentulous dry specimens were examined macroscopically and by linear and caliper measurements. Width and length of the edentulous arches were registered from the molar regions to the crest of the incisor zone. Residual ridges were quantified at the incisor, premolar, and molar regions. Results : Arches and ridges varied in size and shape. A trabecular bone track was present at the edentulous surface. In the maxillary arch, trabecular tissue was external to the cortical palatal vault, and in the mandible, the trabecular bony stretch was inside the cortical plates along the entire edentulous surface of the jaw. Of the ridges, 38% were thin knife-edged. In the maxilla, bone resorption was centripetal, and the crest of the edentulous arch was external to the osseous base of the cranium. In the mandible, resorption was centrifugal, forming an edentulous crest lingual to the mental protuberance anteriorly and to the mandibular base posteriorly. This discrepancy produced a reverse horizontal overlap of the residual crests, where the edentulous maxilla was at the same level or internal to the facing edentulous mandible. Conclusions : This study, performed on 123 human edentulous dry bone specimens, indicates that the edentulous arch and the residual ridge take many forms. At the occlusal surface of the edentulous jaw a trabecular track is the remaining scar after tooth extraction. To accommodate an entire metal osseointegrated implant within the residual bone volume, crest reduction and bone grafts may be required as preprosthetic surgical measures. After tooth loss, maxillary resorption was centripetal and apical, whereas mandibular resorption was centrifugal and also apical, resulting in a reversed horizontal relationship in fully edentulous subjects.Keywords
This publication has 13 references indexed in Scilit:
- Responses of jawbone to pressure*Gerodontology, 2004
- Association of residual ridge resorption with systemic factors in home-living elderly subjectsActa Odontologica Scandinavica, 1997
- A review of residual ridge resorption and bone densityThe Journal of Prosthetic Dentistry, 1996
- A classification of the edentulous jawsInternational Journal of Oral & Maxillofacial Surgery, 1988
- Occlusion between removable dentures and natural teethJournal of Oral Rehabilitation, 1977
- The remodeling of the edentulous mandibleThe Journal of Prosthetic Dentistry, 1976
- The bony residual ridge in manThe Journal of Prosthetic Dentistry, 1975
- The continuing reduction of the residual alveolar ridges in complete denture wearers: A mixed-longitudinal study covering 25 yearsThe Journal of Prosthetic Dentistry, 1972
- Reduction of residual ridges: A major oral disease entityThe Journal of Prosthetic Dentistry, 1971
- The Minute Anatomy of the Lower Jaw in Relation to the Denture ProblemThe Journal of the American Dental Association, 1942