title: Effect of systemic matrix metalloproteinase inhibition on periodontal wound repair: a proof of concept trial.
abstract: BACKGROUND
  The adjunctive use of matrix metalloproteinase (MMP) inhibitors with scaling and root planing (SRP) promotes new attachment in patients with periodontal disease. This pilot study was designed to examine aspects of the biological response brought about by the MMP inhibitor low dose doxycycline (LDD) combined with access flap surgery (AFS) on the modulation of periodontal wound repair in patients with severe chronic periodontitis.
  
  
  METHODS
  Twenty-four subjects were enrolled into a 12-month, randomized, placebo-controlled, double-masked trial to evaluate clinical, biochemical, and microbial measures of disease in response to 6 months therapy of either placebo capsules + AFS or LDD (20 mg b.i.d.) + AFS. Clinical measures including probing depth (PD), clinical attachment levels (CAL), and bleeding on probing (BOP) as well as gingival crevicular fluid bone marker assessment (ICTP) and microbial DNA analysis (levels and proportions of 40 bacterial species) were performed at baseline and 3, 6, 9, and 12 months.
  
  
  RESULTS
  Patients treated with LDD + AFS showed more potent reductions in PD in surgically treated sites of >6 mm (P<0.05, 12 months). Furthermore, LDD + AFS resulted in greater reductions in ICTP levels compared to placebo + AFS. Rebounds in ICTP levels were noted when the drug was withdrawn. No statistical differences between the groups in mean counts were found for any pathogen tested.
  
  
  CONCLUSIONS
  This pilot study suggests that LDD in combination with AFS may improve the response of surgical therapy in reducing probing depth in severe chronic periodontal disease. LDD administration also tends to reduce local periodontal bone resorption during drug administration. The use of LDD did not appear to contribute to any significant shifts in the microbiota beyond that of surgery alone.
authors.affiliation: Center for Craniofacial Regeneration and Department of Periodontics/Prevention/ Geriatrics, School of Dentistry, University of Michigan, Ann Arbor, MI 48109-1078, USA.
authors.forename: R
authors.initials: R
authors.lastname: Gapski
authors.forename: J L
authors.initials: JL
authors.lastname: Barr
authors.forename: D P
authors.initials: DP
authors.lastname: Sarment
authors.forename: M G
authors.initials: MG
authors.lastname: Layher
authors.forename: S S
authors.initials: SS
authors.lastname: Socransky
authors.forename: W V
authors.initials: WV
authors.lastname: Giannobile
mesh_terms: D000328:Adult; D000368:Aged; D001419:Bacteria / Q000187:drug effects; D024042:Collagen Type I; D004311:Double-Blind Method; D004318:Doxycycline / Q000008:administration & dosage / Q000627:therapeutic use*; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D005883:Gingival Crevicular Fluid / Q000737:chemistry; D006801:Humans; D008297:Male; D061965:Matrix Metalloproteinase Inhibitors; D008875:Middle Aged; D010446:Peptide Fragments / Q000032:analysis; D010455:Peptides; D017622:Periodontal Attachment Loss / Q000188:drug therapy / Q000601:surgery; D010514:Periodontal Pocket / Q000188:drug therapy / Q000601:surgery; D010518:Periodontitis / Q000188:drug therapy / Q000601:surgery*; D010865:Pilot Projects; D010919:Placebos; D011347:Procollagen / Q000032:analysis; D013524:Surgical Flaps; D014945:Wound Healing / Q000187:drug effects
chemical_list: D024042:Collagen Type I; D004791:Enzyme Inhibitors; D061965:Matrix Metalloproteinase Inhibitors; D010446:Peptide Fragments; D010455:Peptides; D010919:Placebos; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; D004318:Doxycycline