Estimation of the Safe Distance Between the Implant and an Adjacent Tilted Implant Using Trigonometry

Simulation of All-on-4 surgical guide in place. Each scored section forms a rectangle 10 mm in height and 7 mm in width. Therefore, the diameter of the rectangles indicates the angulation of 35° (tan⁻¹ 0.7). The direction defined in black indicates 45°. Grading the upper edge enhances accuracy in placing tilted implant.

The sides of the triangle are the distance between and the lengths of the 2 implants. Beta is the angulation of the tilted implant.