Objective: The aim of this research was to examine the attitudes and experiences of dental medicine doctors regarding the failure of implantoprosthetic treatment. Materials and methods: This cross-sectional study was based on a survey questionnaire that included doctors of dental medicine in the Republic of Croatia. The questionnaire was designed in a Google form and distributed to doctors at 466 e-mail addresses. The first part of the questionnaire examines general questions such as gender, age, years of work experience, level of education and experience working with implants. The second part of the questionnaire examines the past experiences of dental medicine doctors in relation to the failure of implantoprosthetic treatment and includes questions that assess clinical attitudes about the failure and complications of implantoprosthetic treatment. Results: A total of 160 doctors of dental medicine participated in the research. The majority of respondents, 69,4%, encountered the failure of implantoprosthetic treatment in their clinical work. Among the respondents, 58,8% of doctors encountered early and 57,5% with late implant failure. The most common failures were considered implant mobility, pain, dysesthesia, periimplantitis with suppuration, peri-implant radiolucency with bone resorption of more than 1,5 mm in the first year of loading (function) and more than 0,2 mm in subsequent years. There is no evidence that it is related to years of experience, nor to whether doctors install implants on their own. Conclusion: Dentists use different criteria to evaluate implant failure. The majority of doctors consider that a follow-up of 6 months is sufficient to assess implant failure. There is no evidence that different attitudes about implant failure are related to years of experience or whether doctors place implants themselves.