Abstract: Objective: To observe the clinical effect of short implant in the posterior region with insufficient bone mass. Methods: 40 cases of bone deficiency in the posterior teeth were implanted with 58 implants.The secondary stage operation was performed with 3-6 months after operation, and the permanent fixation was completed in 4-6 weeks. After 5-10 years of follow-up, a comprehensive evaluation of implant ef-fects was conducted. Results: The clinical and imaging examinations were performed regularly. Accord-ing to the standard of implant success proposed by Albreksson and Zarb, the cumulative success rate was 96.6% with 5-10 years. Conclusion: Application of short implants in the posterior teeth with relatively insufficient bone mass not only avoids excessive injury of bone graft surgery, reduces complications, but also reduces the pain and fear of patients, and reduces the cost of operation.

Key words: short implant, insufficient bone mass, vertical distance, implant repair, clinical effect