Dental students should be able to perform adequate endodontic treatments upon graduation. The purpose of the presented study was to determine the influence of the preliminary diagnosis on the outcomes of endodontic treatment performed by undergraduate students. Material and methods: The study sample consisted 827 teeth endodontically treated by students from the Faculty of Dental Medicine in Sofia, Bulgaria. They were divided into 3 groups according to the preliminary diagnosis. The distance between the end of the root canal filling and the radiographic apex was used to evaluate the quality of the root canal filling. Results: Good filling length was found in 68.95% of the teeth with preliminary diagnosis Pulpitis, 56.4% of the teeth with chronic periodontitis and 49.9% in the retreatment cases. Worst results were achieved in the retreatment of molars (26.2%). A statistically significant difference was observed when comparing premolars and molars for all diagnoses, as well as when comparing front teeth and molars with Irreversible pulpitis and Retreatment cases. For front teeth and premolars were proved to be with no statistically significant difference of the diagnosis. Conclusions: Based on the results of the study we might recommend the students to be allowed to do retreatment on molars only in strictly limited cases.

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