Abstract
A convenience sample of 154 edentulous patients referred for implant provision at a Regional National Health Service Dental Hospital in the North West of England were identified. The cephalometric radiographs that were taken as part of the patient baseline investigation were assessed. Digital tracing was used to measure the anterior maxillary and mandibular bone height and ridge angle with respect to the maxillary and mandibular planes. The mean height of the bone in the maxilla was found to be 14 mm, and the mean ridge angle for the anterior maxillary residual ridge is 104°. The mean height of bone in the mandible was 18 mm, while the mean ridge angle for the anterior mandibular residual ridge was 77°. Using the Cawood and Howell classification demonstrated that class VI mandibles were the most common. The cross-sectional shape of the mandible varied, with the triangular shape most common. Although there was adequate bone stock for implant placement in these cases, the mandibular residual ridge resorption presents a lingual inclination to the residual bone. The limited residual ridge position and inclination would dictate that conventional implant placement could be challenging.
Highlights
The number of patients in the UK that are edentulous is falling
Dentists will continue to need conventional complete denture skills for the foreseeable future [2]. It is well established in the classical studies by Tallgren and Carlsson that tooth extraction results in alveolar bone resorption [3,4]
Subsequent studies have failed to agree on the rate, volume and distribution of this resorption, and there appears to be a high degree of variation between individuals
Summary
The number of patients in the UK that are edentulous is falling. The Adult Dental Health Survey in 2009 revealed that 94% of adults in England, Wales and Northern Ireland retained at least one natural tooth. Dentists will continue to need conventional complete denture skills for the foreseeable future [2] It is well established in the classical studies by Tallgren and Carlsson that tooth extraction results in alveolar bone resorption [3,4]. This standard of care has not been achieved for most In those complete denture wearers that do receive dental implants, the use of prosthetic componentry to attach a denture to the implant will increase its retention. At Manchester dental hospital, patients who are referred after failing to tolerate conventional denture construction will be assessed at a Joint Implant Clinic. The aim of the study was to assess the residual bone morphology that was present in the anterior maxilla and mandible in a cohort of patients who had failed to tolerate conventional complete dentures and were seeking NHS dental implant provision
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