Tehran University of Medical Sciences Journal of Craniomaxillofacial Research 2345-5489 7 1 2020 08 01 21 25 Seyed Hadi Hosseini Department of Oral and Maxillofacial Surgery, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran. Zahra Mazareii Fard DDS, Private Practice. Donya Maleki Student Research Committee, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran. 2020 04 26 2020 06 18 Aim: As the patterns of impaction can affect the treatment plan of removing or remaining the impacted tooth, the difficulty of surgery, and the post-surgical complications, this survey aimed for assessment of the mandibular wisdom tooth impaction patterns in terms of angulation and depth in the north population of Iran. Materials and Methods: 196 Panoramic radiographs were gathered from patients attending to the department of oral and maxillofacial surgery of GUMS in 2018-2019. To perform this retrospective study the prevalence of impaction, angulation, and the level of the eruption were assessed. The data were analyzed by SPSS 16. Results: This study found that the most common pattern of impacted mandibular third molars was level B in terms of depth and mesioangular in terms of angulation. Conclusion: The current study notes the importance of determining the angulation and level of wisdom tooth in designing the pre-surgical treatment and in post-surgical complaints. Keywords: Impacted teeth; Panoramic radiography; Retrospective study; Third molar. https://jcr.tums.ac.ir/index.php/jcr/article/view/318 https://jcr.tums.ac.ir/index.php/jcr/article/download/318/285