Abstract
After radical operation of the maxillary sinus according to the Caldwell-Luc method, the scar tissue invaded into the maxillary sinus from the bone defect. The invaded scar tissue caused some complications. To prevent the invaded scar tissue, in 30 patients, the bone defect was closed by free reimplantation of anterior wall bone. The reimplantated bone remained and the scar tissue had not invaded the maxillary sinus. The drainage window into the lower nasal cavity remained, and the walls of the maxillary sinus had retracted. The reclosure of the bone defect in the anterior wall bone prevented the invasion of the scar tissue and enhanced favorable healing of the maxillary sinus.