Abstract: PURPOSE: To investigate the clinical value of golden ratio in maxillary sinus augmentation and simultaneous implantation. METHODS: Fifteen patients were enrolled with missing maxillary molars and residual bone height(RBH) about 2.0-5.0 mm from Jul. 2016 to Oct. 2017 at the Department of Implantology in the Affiliated Hospital of Qingdao University of West Coast District. The patients underwent maxillary sinus augmentation and simultaneous implantation and followed up for 3-6 months. Golden ratio was used to select the length of implants about 11-12 mm. RESULTS: A total of 21 implants were placed in 15 patients. All patients had good osseointegration of the implants and the surrounding bony tissues on imaging, and none of them had complication, such as maxillary sinusitis, loose implant, peri-implantitis, etc. Six months after operation, restoration was performed, the patients had satisfactory masticatory function and normal soft tissues around the implants. CONCLUSIONS: Application of golden ratio in maxillary sinus floor elevation and simultaneous implantation can solve insufficient RBH in posterior maxillary area， and provide reliable reference for selection of implant length.

Key words: Maxillary sinus augmentation, Dental implant, Golden ratio