Cementum covers resected root end in:: (A) 12 days, (B) 20 days, (C) 28 days, (D) 8 weeks
Answer is C. Proliferation of granulation tissue from the severed PDL was observed at 4 days, and the tissue had completely encapsulated the root end at 8 days. In the experimental groups, cementum deposition was observed at 12 days, and by 16 days, cementum covered more than 50% of the surface areas of the resected root ends. 
The complete healing will take around 4 weeks.