Effect of Postsurgical Systemic Doxycycline After Regenerative Periodontal Therapy

The patients of the doxycycline group will take 200 mg doxycycline once a day for 7 days after regenerative therapy of an infrabony defects.

The patients of the doxycycline group will take 200 mg placebo once a day for 7 days after regenerative therapy of an infrabony defects.

Following an intra-crevicular incision a mucoperiosteal flap was reflected to a height of 5 mm exposing the bony margin of the defect and allowing complete visualization of the infrabony lesion. The flap was designed according to the modified or simplified papilla preservation technique to obtain primary closure of the wound and the membrane respectively. The flap was extended at least one tooth mesially and distally of the defect side. After complete removal of inflammatory granulation tissue, the root surfaces were thoroughly scaled and root planed.

When using EMD the root surfaces facing the infrabony defect were conditioned with EDTA (prefgel; Institut Straumann AG, Basel, Switzerland) for 2 min. first. Then the EDTA was washed out with plenty of saline. After drying the surfaces EMD was applied starting at the bottom of the defect and proceeding coronally.

Furthermore, all patients were advised to rinse with a 0.12% chlorhexidine gluconate solution (ParoEx; Butler, Kriftel, Germany) for 2 min. twice daily for 5-7 weeksafter surgery.

400 mg ibuprofen qd was prescribed for patient's comfort if necessary.

If soft tissue dehiscence was noted the patient was advised to use a 1% chlorhexidine gluconate gel (Chlorhexamed 1% Gel; GlaxoSmithKline, Bühl, Germany) twice daily