Abstract: Objective To analyze the image of the implant cases after extracting inflammatory maxillary molar by CBCT, and discuss the relationship between the degree of inflammation and maxillary sinusitis and the effect of planting time on the survival rate of implants. Methods The study analyzed CBCT images of 73 patients with inflammatory teeth. According to the relationship between inflammation and the bottom of maxillary sinus, there were three groups(Group A: inflammation entered into the bottom; Group B: inflammation connected with the bottom; Group C: inflammation had a certain distance to the bottom), through the measurement of the vertical distance from inflammatory maxillary molar to maxillary sinus bottom to observe their correlation, by measuring the bone resorption degree of CBCT coronal plane to assess the efficacy of planting. Results The incidence of maxillary sinusitis in group A was 100%, the incidence rate of group B was 77.1%, and the incidence rate of group C was 42.9%. There were 2 implants off in the 73 implant cases, which were immediate implant cases. The other cases were good after CBCT image analysis. Conclusion The smaller the distance between inflammation and maxillary sinus, the greater the risk of maxillary sinusitis is. The removal of the diseased teeth is conducive to the recovery of maxillary sinusitis. The survival rate of immediate implant placement is lower than that of early implant placement and delayed implant placement.

Key words: [keyword] BCT, maxillary molar, dental implant