A. Differences in screw insertion direction due to differences in plate placement angle in the right image, the plate positioning angle is larger than the positioning surface; therefore, the screw is inserted anteriorly (*). On the left side, the plate positioning angle is smaller than the positioning surface; therefore, the screw is inserted posteriorly, allowing a longer screw to be inserted (†). B. With plates inserted from the medial side, the cortical surface is inclined, making it easier for the screw to be directed posteriorly to the optimal position (*); however, with plates inserted from the lateral side, the cortical surface is flat; therefore, it is important to be careful not to tilt the plate anteriorly. Implants with screws directed posteriorly may allow the screw to be inserted further (†).