A case is described of application of the immediate overdenture technique to restore function, speech and aesthetics in a patient with extreme resorption of the maxillary anterior residual ridge. In the opinion of the authors, retention of the roots of the remaining teeth most definitely contributed to the retention, stability and overall success of the denture (Figs. 9, 10).
Marginal leakage is the penetration of fluids, bacteria and ions into the space existing between all restorative materials and cavity walls. It can cause pulp irritation, colour changes in the tooth and secondary caries, and may result in failure of the restoration. The margins of a fresh amalgam restoration invariably leak. As time passes there is a decrease in marginal leakage related to the production of corrosion products and the spreading of certain materials into the space between the tooth and the restoration. Correct cavity margin preparation and proper condensation of the restorative material minimize marginal leakage round fresh amalgam restorations. Varnish coated on the cavity walls is most important and an indispensable method for preventing marginal leakage.
A modified technique for recording tissue and abutment relationships in one session has been presented. Using the technique chair-tite and discomfort for the patient are significantly reduced.
The role of the bitewing roentgenogram in dentistry is reviewed, including the roentgenographic techniques used, accessories for stabilisation of the film, and execution of the roentgenograph. Common errors in application of the technique are listed. The literature on the bitewing roentgenogram is surveyed and the conclusion stated that this roentgenographic technique is a diagnostic instrument that has no substitute for the purpose of detecting incipient interproximal carious lesions and periodontal diseases in the early stages of affecting the alveolar bone. No dental examination can provide complete diagnosis without bitewing roentgenograms.
For patients with certain oral and nasopharyngeal tumors irradiation therapy, alone or combined with surgical procedures, can be a life-saving treatment. The professionals involved should be aware of the clinical and histological changes brought about by the therapy so that they may better assist the patient at this difficult time through education and relief of discomfort. Treatment of the irradiated patient is a challenge to the knowledge and skills of any dentist and office staff.
Teeth that are unsuitable as abutments for a fixed bridge or removable partial denture may be retained as roots under an overdenture. While these roots remain, the vertical height of the bony ridge is preserved. In addition, the roots give support to the denture and reduce stress on the alveolar ridge.
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