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After cementation for #19 and 20 crowns, the crown of #20 is removed for cement removal; attention is paid to cement removal around the crown at #19. In fact, the removal is ineffective with the crown of #20 is reseated and retightened (Fig.9 >). Repeated removal proves to be futile (Fig.10 >). The most effective method will be to take X-ray immediately after #20 crown/abutment removal for #19 and 20 cement removal and #20 crown/abutment reseating without torque so that it will be easier to remove the remaining cement at #19 if needed. Now it may be ok to have minimal cement in term of hygiene, since proximal brush is used daily.
Xin Wei, DDS, PhD, MS 1st edition 01/18/2018, last revision 08/15/2018