Assessment of Failed Dental Implants and Reimplantation at Sites of Previous Implant Failure: Survival Rates and Risk Factors

Abstract

Objective: To evaluate the survival rates of dental implants reimplanted at sites of previous implant failure and 
identify key risk factors influencing their outcomes. 
Study Design: This retrospective study Place and Duration of Study: This study was conducted at the Khyber Teaching Hospital Peshawar during June 2022 to June 2024. 
Methods: Data were collected on patient demographics, causes of previous failures, timing of reimplantation 
(immediate, delayed, or extended delay), surgical techniques, and postoperative outcomes. Kaplan-Meier survival analysis and multivariate logistic regression were performed to assess survival rates and risk factors. 
Results: The overall survival rate of reimplanted implants was 87.1% after a minimum follow-up period of 12
months. Survival rates were highest in extended-delay reimplantation (92%), followed by delayed (88.9%) and 
immediate (80%) procedures. Significant risk factors for implant failure included smoking (Odds Ratio [OR]: 3.2, 
p=0.002), poor bone quality (OR: 2.7, p=0.004), and a history of peri-implantitis (OR: 2.4, p=0.01). Protective factors included the use of bone augmentation (OR: 0.4, p=0.008) and advanced implant surfaces (OR: 0.3, p=0.01). 
Peri-implantitis was the most common complication (8.2%). 
Conclusion: Reimplantation at sites of previous failure is a viable option with favorable survival rates when 
appropriate protocols are followed. Extended healing periods, site preparation with bone augmentation, and the use of advanced implant designs significantly improve outcomes. Clinicians must address patient-related risk factors, such as smoking and systemic health, to optimize reimplantation success.