Risk factors for the failure of re-implanted dental implants: A 20-year retrospective study

Area of Science:

• Dental Implantology
• Periodontics
• Prosthodontics

Background:

• Re-implantation of failed dental implants is a common procedure to maintain prosthetic plans.
• However, re-implanted implants may not always achieve ideal outcomes due to various contributing factors.
• Limited research exists on the survival rates and influencing factors of re-implanted dental implants.

Purpose of the Study:

• To identify risk factors associated with the re-failure of second-time placed dental implants.
• To evaluate the survival rates of implants that have been previously placed and subsequently re-implanted.
• To analyze previously failed implants to understand factors contributing to their secondary failure.

Main Methods:

• A retrospective analysis of 10,666 dental implants placed in 4063 patients was conducted.
• 259 failed implants in 170 patients were evaluated using clinical and radiographic records.
• Survival analysis was performed on 80 second-time placed implants that met inclusion criteria, examining patient-, surgical-, implant-, and prosthesis-related factors.

Main Results:

• The 1-year survival rate for second-time placed implants was 88.1%.
• Identified risk factors for re-failure included smoking (Hazard Ratio [HR]=5.066), implant surface (HR=18.776), and timing of reimplantation (HR=0.086).
• Smoking and specific implant surface characteristics were significantly associated with increased re-failure risk.

Conclusions:

• Second-time placed implants demonstrate a lower survival rate compared to first-time placed implants.
• Key risk factors for re-failure are smoking, implant surface characteristics, and the timing of reimplantation.
• Pre-reimplantation analysis of failure factors and control of modifiable risks are essential to improve outcomes.