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Table 3 Formula for the CBD

From: Peri-implant bone changes in immediate and non-immediate root-analog stepped implants—a matched comparative prospective study up to 10 years

Implant diameter and length Formula for the calculation of the CBD
(CBD = coronal bone defect)
(DD = defect depth)
3.8 × 13 mm CBD = DD + 5 mm
3.8 × 15 mm CBD = DD + 7 mm
All other diameters CBD = DD + 3.2 mm