Objective: The aim of this study to evaluate the knowl edge levels of dentists trained in two different specialties about the clas sification of third molar tooth positions. Material and Methods: Totally30 volunteer dentists, including 12 oral and maxillofacial radiologists(Group 1), 18 oral and maxillofacial surgeon (Group 2), were included inthe study. The participants were answered the 46-question survey form.Information questions were included in the first part, and visual ques tions in the second part of the survey form. In the visual questions, the po sitions of third molar teeth belonging to Pell and Gregory and Winterclassification were asked. In the first stage, visual questions were askedwithout drawing the planes/measuring angle valid in these classifications.In the second stage, the same images were asked again in a mixed orderby making the necessary plane drawings/angle measurements. The cor rect answers were statistically analyzed by Pearson chi-square test andpaired t-test. Results: A statistically significant difference was found be tween two groups in the number of correct answers given before and afterthe required plane drawings of the lower third molar tooth positions, ac cording to the ramus relationship of the Pell and Gregory classification(p<0.05). Conclusion: Although these classifications are the most knownand used classifications, third molar tooth positions should be decidedby making necessary plane drawings and angle measurements.