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When a short (Fig.10 S, 3 mm) abutment is placed at #18, there is enough occlusal clearance. The latter is barely sufficient when a long (L, 5 mm) abutment is placed at #19. *: occlusal composite, which will be removed prior to impression.
Xin Wei, DDS, PhD, MS 1st edition 12/27/2016, last revision 12/27/2016