B ackground: Panoramic radiography is technique that includes images of the mandible, maxilla in a single image to complement the clinical examination of teeth. Panoramic radiography is technique that includes images of the mandible, maxilla, and supporting structures in a single image to complement the clinical examination of teeth. Panoramic radiography is frequently employed to assess third molar prevalence, impaction status, and the proximity of impacted mandibular third molars to the mandibular canal. Third molar impaction roots were measured based on the Rood and Shehab 's approach based on seven diagnostic signs of panoramic radio graphs. Objective: This study to determine prevalence of the position of the impacted mandibular third molar roots in relation to the mandibular canal using the rood and shehab 's classification. Methods: Descriptive research with a cross sectional approach. The sample was 210 left and right third molar impaction tooth mandibular on 105 secondary data of digital panoramic radiographs at the Radiology Installation, RSGM­p FKG Usakti and categorized according to the seven classifications of Rood and Shehab. The interobserver reliability test was conducted using Cohen's Kappa test. The data is presented as frequency and percentages for each type of root position classification. Results: Radiolucent tooth type on the root was the most prevalent at 104 (50%), white line interruption in 28 (13%), narrowing of the mandibular canal in 27 ( 13% ), deflection of the tooth root in 26 ( 12% ), deflection of mandibular canal in 11 (5%), narrowing of the root in 8 (4%), and bifid apex in 6 (3%). Conclusion: The highest prevalence of third molar impaction tooth root position was radiolucent type at the root and the lowest was bifid apex type.