PubMed · 1999572
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N Cranin. 1991. Dental implants.. https://pubmed.ncbi.nlm.nih.gov/1999572/
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A patient presenting with bilateral intermittent mental paraesthesia on wearing a lower denture on a very atrophic ridge was treated with an implant-retained overdenture which resolved her symptoms.
In a beagle dog study, the peri-implant bone changes around flexible (Polyactive) and rigid hydroxyapatite (HA) implants were investigated radiographically by quantitative digital subtraction analysis and by assessment of marginal bone height, with the aid of a computerized method. A loss of approximately 1 mm of marginal bone height was observed for both the dense Polyactive and the HA implants, after 6 months of loading. This value appeared to be stable from 12 weeks of loading onward. Along the total length of the implant during the first 6 weeks of loading, both the flexible (dense Polyactive) and the rigid (HA) implants showed a decrease in density. However, after this 6-week period, the bone density around the implants increased, and after 18 weeks the original bone density was reached. The flexible Polyactive implants provoked less decrease in density than the rigid HA implants, although not to a statistically significant level. This finding sustains the hypothesis that flexible implant materials may transfer stresses to the surrounding bone more favorably.
A study was carried out on 104 mandibles and 96 maxillae from anthropologic collections to challenge or support the studies of Cawood & Howell (1988, 1991). The data provided reveal considerable individual variations that cast some doubt on the practical use of the classification. It is suggested that the use of individual three-dimensional models will largely replace current modes of depicting resorbed jaws.