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For example at #11, a long implant has to be placed a little more outside the bone (Fig.4 green area), since the longest cuff of the abutment (red area) is 5 mm for UF implant system. The longer the cuff, the less amount of the implant will be outside the bone with less chance of periimplantitis. When the coronal implant threads are exposed, a large amount of bone graft has to be placed (yellow circles).
Xin Wei, DDS, PhD, MS 1st edition 01/29/2017, last revision 01/29/2017