implants - international magazine of oral implantology

_An adequate width and height of bone in an edentulousareaisessentialwhenplacinganimplantin order to obtain an ideal functional and an aesthetic prostheticreconstructionfollowingplacement. Histologicalinvestigationshavedescribedtheheal- ing of extraction sockets (Amler etal. 1960). Tooth ex- traction results in a loss of alveolar bone volume, both horizontally and vertically owing to resorption. The greatest amount of bone loss happens in the horizon- tal dimension and occurs on the facial aspect of the ridge.Thereisalsoalossofverticalridgeheight,which ismostpronouncedtowardsthebuccalarea.Asalveo- lar bone is a tooth-dependent structure, the normal post-extractionhealingisresorptive.Becausethecrest ofthebuccalboneiscomposedofbundlebone,thisre- modelling results in vertical reduction of the crest (Araújo & Lindhe 2005). The majority of the dimen- sional alterations of the alveolar ridge (two-thirds) takesplaceduringthefirstthreemonthsfollowingex- traction,andanaverageof40%oforiginalheightand widthisexpectedtobelostafterthreeyears(Lekovicet al.1997;Schroppetal.2003). The most predictable way to maintain the width, heightandpositionofthealveolarridgesistoperform ridgepreservationatthetimeoftoothextraction.This procedure requires an intra-socket osseous graft and the use of a membrane and should reduce the mor- phological changes in alveolar bone (Lekovic et al. 1998; Wang etal. 2004). In a six-month animal study, AraújoandLindhedemonstratedthattheplacementof a biomaterial in an extraction socket may modify the remodellingandridgeresorptionthatoccursfollowing I case report _ ridge preservation and GTR Figs. 1 & 2_The patient was referred for extraction of a right temporary mandibular second molar. Figs. 3 & 4_Image of the combined two- and three-walled bony defect of 6 mm and 5 mm, and the fenestration of the buccal plate. Figs. 5 & 6_A ridge preservation technique was performed using a xenograft material and a double layer of resorbable collagen membrane. Ridge preservation and GTR with a xenograft and resorb- able collagen membrane Author_Drs Mariana Baglivo, Prof Hugo Campos, Prof Miguel Angel Carrasco, Prof Andrés Pascual, Prof Paul Levi & Prof José Nart, Spain 14 I implants3_2011 Fig. 2Fig. 1 Fig. 3 Fig. 4 Fig. 5