A method of an implant-prosthetic treatment of a patient with residual dentition in the maxilla by fabricating an overdenture using a bar and locator as retention elements has been presented. Since conventional removable dentures, often the first treatment choice for patients with missing teeth, can provoke poor retention complaints, clinicians have been prompted to seek an alternative solution - an implant-supported overdenture (ISOVD – implant-based overdenture). In the presented case, the ISOVD eliminated issues with retention and stability, improved aesthetics, enhanced the patient’s quality of life, and contributed to greater patient satisfaction. Today, implants are widely used for replacing missing teeth or as support for denture retention. The use of an implant-supported overdenture is a well-established alternative to a fixed implant-supported prosthesis and is more economically acceptable for the patient. The case of a 56-year-old patient highlights the importance of an individualized treatment plan tailored to the patient’s specific needs and anatomical conditions, after all possible therapeutic options had been presented and discussed. The approved treatment plan represents a compromise solution that does not hinder the possibility of expanding prosthetic work in the future. The goal was to develop a treatment plan that combines functionally correct prosthetic design while also considering the patient’s preferences – an essential factor for therapeutic success. Of all the available types of retention systems on the market, the patient’s treatment plan involved the use of a bar and locator system.