Fig. 2. Spatial relationship. Mesioangulated (A), horizontal (B), vertical (C), distoangulated (D), reverse mesioangulated (E) was defined when the long-axis of the third molar was impacted between 11° to 79°. Horizontal and vertical were defined as cases where the angle between the adjacent second molar was 80° to 100° (almost perpendicular) and −10° to 10° (almost parallel), respectively. When the long axis was −11° to −79°, it was designated distoangulated. Reverse was defined when the crown of impacted third molar was more root-oriented than horizontal.