“…Experimental periodontitis was performed with intramuscular solution of 2% xylazine hydrochloride (15 mg/Kg) (Rompum‐Bayer ® , São Paulo, SP, Brazil) and ketamine (40 mg/Kg) (Francotar‐Virbac ® , Roseira, SP, Brazil). A nylon ligature 3‐0 (Shalon ® , Goiania, GO, Brazil), was inserted around the 1st lower molar of each animal bilaterally . After 20 days, rats were euthanized and blood was collected for biochemical tests.…”