Two techniques of ridge augmentation using onlay bone graft alone or associated with a non-resorbable membrane have been previously described. This prospective, randomized study compared these two techniques at 6 months, in terms of bone gain, resorption and quality obtained at edentulous sites. Osseous measurements were taken using stents, callipers and CT-scans. Membrane exposure occurred at one site, 4 weeks after placement. Endosseous implants were successfully placed at all grafted sites. The mean graft thickness for all subjects was 4.7 mm (range: 2.3-6.2 mm). Overall mean resorption was 1.5 mm (range: 0-4.6 mm) whereas overall mean width gain was 3.2 mm (range: 0.8-6.2 mm). Six months following surgery, the membrane group experienced significantly less bone resorption than the graft alone group (P<0.01). Width augmentation did not differ significantly between the two groups. In conclusion, combining a membrane with an onlay graft demonstrates less bone resorption with a minimal risk of complications. Longer follow-up is needed to confirm the benefits of using a non-resorbable membrane.

Parce qu'elle utilise des générateurs électriques de rayons X pour le radiodiagnostic chez l'animal, la profession vétérinaire est également soumise à la réglementation concernant la radioprotection. Ainsi la législation impose à toutes les personnes travaillant à proximité de ces appareils des obligations techniques, d'organisation et administratives. Elle implique aussi la formation d'une personne compétente en radioprotection et en définit le rôle. La reconnaissance d'une spécificité vétérinaire par rapport aux activités nucléaires, industrielles et de médecine humaine est soulignée.