He paused for a moment, turned around, and looked at the young doctor who asked the question.
"What I mean is that the millimeters are just for convenience in explanation. Every patient is different, and seven millimeters and two millimeters are averages, not absolutes. You need to find the 'Resident's Ridge' first and then use a probe to confirm. Within a one-millimeter range around the planned tunnel location, gently press with the probe. The bone texture of the original footprint is slightly denser than the surrounding area, providing different feedback when pressed. You need to find the hardest point, which is the real center."
In the meeting room, some people were taking notes, some were staring at the diagram on the whiteboard, and some were gesturing in the direction of "seven millimeters, two millimeters." The old professor sat in the corner, with his arms crossed over his chest and eyes slightly squinting, showing no expression, but his right hand was resting on his knee.
