Summary: Objective: The aim of the present study was to analyze incidence of individual local factors participating in etiology of disorders in dentition of upper permanent canine tooth. Material and Methods: The examined cohort consisted of 190 patients (114 women and 76 men) with disorders in dentition of upper permanent canine tooth. The mean age of women was 17.9 years and that in men was 17.4 years. In these patients we analyzed a total of 240 (140 – unilaterally and 50 – bilaterally) retained or ectopic dentition took place. Individual factors were evaluated in orthopantomograms and CI findings which were available in all patients. Results: The occurrence of local etiological factors was recorded – insufficient space (20.8%) and completely lacking space for canine tooth dentition (10.8%), surplus of space (15-8%), hypodontia of lateral incisor (5.4%), uvular lateral incisor (7.5%), canine tooth transposition with lateral canine tooth(4.2%) and with the first premolar (6.7%), anomalous position (27.9%) and deformity in the root shape of the first premolar (3.7%), superfluous formation (3%) and a cyst (0.83%) preventing canine tooth dentition, primary ectopy (1.7%) and unknown cause (10%). Conclusion: The knowledge of etiology and early diagnosis of causal factors is necessary for initiation of interceptive therapy of disorders in dentition of upper permanent canine tooth. The work is a part of the project SVC No.1M0528

        Key words: upper permanent canine tooth – dentition disorders – impaction – etiology – lateral incisor – first premolar