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Dental Tribune United Kingdom Edition

United Kingdom Edition H istological investigations have described the heal- ing of extraction sockets (Amler et al. 1960). Tooth extrac- tion results in a loss of alveolar bone volume, both horizontally and vertically owing to resorption. The greatest amount of bone loss happens in the horizontal dimen- sion and occurs on the facial as- pect of the ridge. There is also a loss of vertical ridge height, which is most pronounced towards the buccal area. As alveolar bone is a tooth-dependent structure, the normal post-extraction healing is resorptive. Because the crest of the buccal bone is composed of bundle bone, this remodelling results in vertical reduction of the crest (Araújo & Lindhe 2005). The majority of the dimensional alter- ations of the alveolar ridge (two- thirds) takes place during the first threemonthsfollowingextraction, and an average of 40 per cent of original height and width is expected to be lost after three years (Lekovic et al. 1997; Schropp et al. 2003). The most predictable way to maintain the width, height and position of the alveolar ridges is to perform ridge preservation at the time of tooth extraction. This procedure requires an intra-sock- et osseous graft and the use of a membrane and should reduce the morphological changes in al- veolar bone (Lekovic et al. 1998; Wang et al. 2004). In a six-month animal study, Araújo and Lindhe demonstrated that the placement of a biomaterial in an extraction socket may modify the remodel- ling and ridge resorption that oc- curs following tooth extraction. They observed that there was an average of 35 per cent of ridge resorption in natural healing and only 12 per cent in the grafted sites (Araújo & Lindhe 2009). The materials and the surgical techniques in use today simplify ridge preservation before implant placement and enable clinicians to ensure the functional and aes- thetic outcome of the implants and subsequent restorations more predictably. Various natural and synthetic bone graft materials are available for the clinician to use for ridge preservation. Bone grafts in general are divided into four major categories: autogenous, al- lografts, xeno grafts and alloplasts. Although the gold standard is the autogenous graft, studies have proven the reliability and func- tionality of using either an allo- graft or xenograft, which avoids the creation of an additional surgi- cal site for bone harvesting. In ad- dition, there is rapid resorption of autogenous grafts, which is much slower with mineralised allografts or xenografts (Artzi et al. 2000; Vence et al. 2004; Irinakis 2006). The use of barrier membranes has become a standard of care in guided bone regeneration and for alveolar ridge preservation and/ or augmentation. The membrane excludes fast growing cells - epi- thelial and connective tissue cells Bib-Eze™ DUX Dental Zonnebaan 14, NL-3542 EC Utrecht, The Netherlands Tel. +(31) 30 241 0924, Fax +(31) 30 241 0054 Email: info@dux-dental.com, www.duxdental.com Bib-Eze™ - The hygienic solution to eliminate contamination risk! No Cleaning Never clean a bib chain again Stretches to Fit One size fits all Easy Application Peel and stick adhesive edge makes application easy Patient Comfort Soft crepe paper for patient comfort Easy application: peel & stick adhesive edge No Cleaning Never clean a bib chain again Stretches to Fit One size fits all Easy Application Peel and stick adhesive edge makes application easy Patient Comfort Soft crepe paper for patient comfort Patient comfort: soft crepe paper No Cleaning Never clean a bib chain again Stretches to Fit One size fits all Easy Application Peel and stick adhesive edge makes application easy Patient Comfort Soft crepe paper for patient comfort Stretches to fit: one size fits all No Cleaning Never clean a bib chain again Stretches to Fit One size fits all Easy Application Peel and stick adhesive edge makes application easy Patient Comfort Soft crepe paper for patient comfort No cleaning: never clean a bib chain again Call 01634 878787 www.kentexpress.co.uk sales@kentexpress.co.uk Fax 01634 878788 Recent study shows* bacterial contamination on 70% of bib holders: Use a hygienic, disposable bib holder with each patient! DISPOSABLE BIB HOLDERS For more information please visit www.duxdental.com * Study Uni Witten/Herdecke on file with DUX Dental For a freetrial box call: 01634 878787 DUX ad Bib-Eze 1-2p DT EN KENT apr12.indd 1 13-04-2012 10:33:14 Ridge preservation and GTR with a xenograft and re- sorbable collagen membrane Prof Nart provides a case study page 20DTà Fig 1 Fig 2 Figs 1 & 2_The patient was referred for extraction of a right temporary mandibu- lar second molar. ‘The most predictable way to maintain the width, height and position of the alveolar ridges is to perform ridge preservation at the time of tooth extraction’