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There is plenty of apical bone at #30 (Fig.9). It is safe to place a 4.5x11 mm IBS implant. But the apical bone at #31 is not a lot. It is better to place 4.5x9 or 10 (UF?) mm implant at #31.
Xin Wei, DDS, PhD, MS 1st edition 04/12/2021, last revision 07/11/2021