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Since the sinus floor is relatively flat at #4, Magic Lifter will be used with guide in place (Fig.2), whereas the one at #12 is oblique, the Lifter will be free hand (Fig.3). Take PA after PRF membrane and bone graft, before implant placement.
Xin Wei, DDS, PhD, MS 1st edition 02/01/2019, last revision 02/01/2019