SM will be chosen because it has abutments with the longest cuff (6 mm (Fig.11) vs. 5 mm (UF, Fig.12)).  Since the unipost (6 mm 0°) is cemented with Ketac, removing it may be difficult.  Still the crown will be sectioned after local anesthesia.  Cavitron will be used to remove cement from the Unipost access.  Then use Unipost driver to remove the Unipost and Implant driver to reverse the implant.

If the latter fails, make an incision as shown in Fig.4-6 and use elevators to loosen the implant, supplemented by surgical handpiece to deepen the trough.  Prepare serrated curette to remove granulation tissue, followed by Metronidazole.

Load SM extra wide taps (5.9-6.9 mm) to form threads and test stability.  If the largest tap fails to achieve stability, try UF largest one (7 mm).  Note the apical diameter of UF implant is larger than that of SM one (compare Fig.11, 12).  

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Xin Wei, DDS, PhD, MS 1st edition 02/12/2016, last revision 02/26/2017