###### Abstract  
The study aimed to evaluate the survival and failure rate, in the short- and medium-term, in addition to its relationship with risk factors, in implants placed by postgraduate students of the Master of Medicine, Surgery, and Oral Implantology course from the University of Barcelona. The study was designed including 192 patients with 422 implants placed between 2015 and 2018. Variables of implant failure were evaluated and related. Failure was split into early failure and late failure. Qualitative data were compared using the chi-squared test, taking \(p\leq 0.05\) as a significant value. The comparison of quantitative variables was carried out using the Student's t-test for independent samples. The survival rate in a period of 6 months to 3 years was 97.87%. The mean age of the patients was (\(54.5\pm 13\)), and the largest number of implants were placed in the 51-60 age range. The failure rate was 2.13% (N = 9), 6 failed early and 3 failed after definitive prosthetic loading, with a \(p\) value < 0.0001. When comparing the failures according to their location in the anterior/posterior sector of the arch, the anterior sector showed statistically significant results (\(p\) = 0.027). Failed implants had a statistically significant relationship when they were placed in the anterior sector and were performed in the early stage.  
Keywords: dentistry; dental implants; survival rate; implant failure; implant success; oral surgery +
Footnote †: journal: Medical  
among other bone regeneration techniques, the success rate of fitted implants is similar to implants placed into native bone and close to 96.4% [12; 13; 14]. In other matters, a range of investigations have shown that the patient's systemic condition, including diabetes [15], hypertension [16], osteoporosis [17], allergies [18; 19], smoking [20], periodontitis [21], and different habits (oral hygiene [22] or parafunctions [23] among others), is a risk factor for treatment with implants [2; 4; 24; 25], particularly when not controlled.  
Most of the data referring to failure and survival percentages in the literature have been provided by experienced surgeons, expert teams with links to commercial brands, or private professionals [3; 26]. However, there are limited data on success, survival, and failure percentages of dental implants placed by postgraduate students. Prior studies have shown that operators skills influence implant osseointegration, with success rates of 84.0% during the first 50 implants, with the rate increasing to 94.4% among later implants [27]. Scientific investigations with undergraduate students have shown a success and survival rate with over 5 years' follow up of 88.0% and 97.2%, respectively [28], while the percentages for postgraduate students are 94.62% and 96.15%, respectively, at one year of follow-up [29].  
Based on the presented data, this investigation aims to evaluate the survival and failure rate in the short- and long term of Biohorizons(r) implants placed by postgraduate students of the Master of Medicine, Surgery, and Oral Implantology course of the University of Barcelona. In addition, it aims to evaluate the relationship between failure and the systemic status of patients.