BackgroundRe‐implantation of failed implants is common to maintain the original prosthetic plan; however, it may not always be ideal due to various factors. Few studies have thoroughly investigated the outcomes of re‐implanted implants, while considering factors that can enhance their survival rates. Therefore, this study aimed to identify the risk factors that may contribute to the refailure of implants placed the second time by analyzing previously failed implants and evaluating their survival.MethodsOf 10,666 dental implants placed in 4063 patients at the Department of Periodontics of the Gangneung–Wonju National University Dental Hospital between December 1999 and March 2021, 259 failed implants in 170 patients were evaluated through clinical and radiographic records for patient‐, surgical‐, implant‐, and prosthesis‐related factors; survival analysis was conducted for implants that met the inclusion criteria.ResultsOf the 259 failed implants, 80 second‐time–placed implants met the inclusion criteria. Survival analysis showed that the 1‐year survival rate of second‐time–placed implants was 88.1%. Smoking (hazard ratio [HR] = 5.066, p = 0.081), implant surface (HR = 18.776, p < 0.01), and timing of reimplantation (HR = 0.086, p < 0.01) were identified as risk factors influencing the refailure of second‐time–placed implants.ConclusionsThe survival rate of second‐time–placed implants was lower than that of first‐time–placed implants. The risk factors for second‐time–placed implant failure were smoking, implant surface, and timing of reimplantation. To prevent further failure, previous failure factors should be analyzed and modifiable risk factors must be controlled before reimplantation.

中文翻译：

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种植牙再植失败的危险因素：20年回顾性研究


背景为了维持原来的修复计划，重新植入失败的种植体是很常见的；然而，由于各种因素，它可能并不总是理想的。很少有研究彻底调查重新植入种植体的结果，同时考虑可以提高其存活率的因素。因此，本研究旨在通过分析先前失败的种植体并评估其存活率，确定可能导致第二次种植体再次失败的风险因素。方法对江陵原州牙周病科的 4063 名患者植入的 10,666 颗牙种植体进行研究国立大学牙科医院在 1999 年 12 月至 2021 年 3 月期间，通过临床和放射学记录对 170 名患者的 259 例种植体失败的患者、手术、种植体和修复体相关因素进行了评估；对符合纳入标准的种植体进行生存分析。结果在 259 个失败种植体中，80 个第二次植入的种植体符合纳入标准。生存分析显示，第二次种植的1年生存率为88.1%。吸烟（风险比 [HR] = 5.066， p = 0.081），种植体表面（HR = 18.776， p < 0.01），以及再植时机（HR = 0.086， p < 0.01）被确定为影响二次种植种植体再次失败的危险因素。结论二次种植种植体的存活率低于首次种植种植体的存活率。第二次种植失败的危险因素是吸烟、种植体表面和再种植时机。为了防止进一步失败，应分析以前的失败因素，并在再植入前控制可改变的风险因素。