The Bermuda midline of digital dentistry
Enter the Bermuda Midline. You might be saying to yourself, “Leif, bit of an exaggeration, that bite scan line isn’t scary at all,” and yet, when you are recording bite scans across full arch quadrants, crossing that magical midline might be more important than you think. When I take bite scans with very few opposing teeth, I have found from experience that unless I scan past the midline in one full bite scan I will not hear that delightful tune.
The reason scanning past the midline is so difficult to do in one go is as you approach that point, your body and hand position starts to get very cramped and tied up. You might be thinking: well why don’t you just perform the old ‘scanner spin’ move? Well with cords, hardware, and real life, it isn’t always so easy. I have learnt from over 2,500 patient scans that taking the scanner out of the mouth and then relocating in a reverse hand position is the easiest way to continue scanning past the Bermuda Midline.
Why cross the line?
The primary reason I go past the midline in complex full arch bite record taking, is that you need to collect as much data as possible to aid the system in putting all the pieces of the bite puzzle together. This might mean taking the scanner out of the mouth (don’t push the button to stop recording though), repositioning your body - hand and scanner - and then putting it back in the mouth for additional record taking by picking up where you left off. If you go past the midline in the first stage, finding a re-reference point to continue the bite into the next quadrant is much easier.