title: Five-year results of a prospective, randomized, controlled study evaluating treatment of intra-bony defects with a natural bone mineral and GTR.
abstract: BACKGROUND
  Treatment with a natural bone mineral (NBM) and a guided tissue regeneration (GTR) has been shown to promote periodontal regeneration. However, until now there are only very limited data on the long-term clinical results following this regenerative technique.
  
  
  OBJECTIVE
  To present the 5-year results of a prospective, randomized, controlled clinical study evaluating the treatment of deep intra-bony defects either with open flap debridement (OFD) and a combination of an NBM and GTR (test) or OFD alone (control).
  
  
  METHODS
  Nineteen patients diagnosed with advanced chronic periodontitis, and each of whom displayed one intra-bony defect, received randomly the test or the control treatment. Results were evaluated at baseline, at 1 and at 5 years following therapy.
  
  
  RESULTS
  No statistically significant differences in any of the investigated parameters were observed at baseline between the two groups. At 1 year after therapy, the test group showed a reduction in mean probing depth (PD) from 9.1+/-1.1 to 3.7+/-0.8 mm (p<0.001) and a change in mean clinical attachment level (CAL) from 10.4+/-1.3 to 6.4+/-1.2 mm (p<0.001). At 5 years, mean PD and CAL measured 4.3+/-0.8 and 6.7+/-1.6 mm, respectively. At 5 years, both PD and CAL were statistically significantly improved compared with baseline (p<0.001) without statistically significant differences between the 1- and 5-year results. In the control group, mean PD was reduced from 8.9+/-1.3 to 4.9+/-1.2 mm (p<0.001) and mean CAL changed from 10.6+/-1.4 to 8.8+/-1.5 mm (p<0.01). At 5 years, mean PD and CAL measured 5.6+/-1.1 and 9.1+/-1.3 mm, respectively, and were still statistically significantly improved compared with baseline (p<0.01). No statistically significant differences were found between the 1- and 5-year results. The test treatment, at both 1 and 5 years, yielded statistically significantly higher CAL gains than the control one (p<0.01). Compared with baseline, at 5 years a CAL gain of > or =3 mm was found in nine defects (90%) of the test group but in none of the defects treated with OFD alone.
  
  
  CONCLUSIONS
  It was concluded that (i) treatment of intra-bony defects with OFD+NBM+GTR may result in significantly higher CAL gains than treatment with OFD, and (ii) the clinical results obtained after both treatments can be maintained over a period of 5 years.
authors.affiliation: Department of Periodontology, Radboud University Medical Center, Nijmegen, The Netherlands. a.sculean@dent.umcn.nl
authors.forename: Anton
authors.initials: A
authors.lastname: Sculean
authors.forename: Frank
authors.initials: F
authors.lastname: Schwarz
authors.forename: Giovanni C
authors.initials: GC
authors.lastname: Chiantella
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Donos
authors.forename: Nicole B
authors.initials: NB
authors.lastname: Arweiler
authors.forename: Michel
authors.initials: M
authors.lastname: Brecx
authors.forename: Jürgen
authors.initials: J
authors.lastname: Becker
mesh_terms: D016301:Alveolar Bone Loss / Q000145:classification / Q000601:surgery*; D001672:Biocompatible Materials / Q000627:therapeutic use; D001857:Bone Matrix / Q000637:transplantation*; D018786:Bone Substitutes / Q000627:therapeutic use*; D003094:Collagen / Q000627:therapeutic use; D005260:Female; D005500:Follow-Up Studies; D005889:Gingival Recession / Q000145:classification / Q000601:surgery; D016557:Guided Tissue Regeneration, Periodontal / Q000379:methods*; D006801:Humans; D008297:Male; D008567:Membranes, Artificial; D008875:Middle Aged; D008903:Minerals / Q000627:therapeutic use*; D017622:Periodontal Attachment Loss / Q000145:classification / Q000601:surgery; D010514:Periodontal Pocket / Q000145:classification / Q000601:surgery; D010518:Periodontitis / Q000601:surgery; D011446:Prospective Studies; D013524:Surgical Flaps; D016896:Treatment Outcome
chemical_list: C106416:Bio-Gide; C077540:Bio-Oss; D001672:Biocompatible Materials; D018786:Bone Substitutes; D008567:Membranes, Artificial; D008903:Minerals; D003094:Collagen