An important stage of orthopedic treatment is to study the problems of the clinical picture and possible consequences of treatment. The loss of the lateral group of teeth, despite their relative insignificance for aesthetics, affects the state of chewing function. However, often included defects with the loss of one tooth are underestimated by patients, which leads to a greater extent of the defect or to the appearance of a terminal defect and, consequently, to a greater decrease in chewing function. The complexity of orthopedic treatment increases with the length of defects. A study of the problem of orthopedic treatment of patients with free-end edentulous spaces on the gender and duration of secondary adentia and the impact of partial removable denture on the denture-bearing area, the function of the dentition system and supporting teeth. The study was performed using partial removable plate dentures with retaining klammers and a base made of polymethylmethacrylate. It was found that with an increase in the period of adentia, there is a decrease in the probability of successful treatment, an increase in the severity of complications on the mucosa of the denture-bearing area as well as faster wear of dentures.