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Where the broken root is taken out, an immediate implant is placed (Fig.4: #10), which is the largest (4.5 mm) among the four. The last 2 implants (#12, 13) are a little too small (2.5 mm) and short to have immediate crowns. In contrast, the front 2 implants (#10 and 11 (3 mm)) are big and long enough to support 2 temporary crowns.
Xin Wei, DDS, PhD, MS 1st edition 09/19/2015, last revision 09/19/2015