What are the possible reasons of occasional marginal discoloration?
• Do not use iron-containing liquids with translucent all-ceramic crowns. A gray discoloration may develop underneath the translucent restoration a few weeks after cementation. Do not use ferrous liquids at the impression appointment or seating appointment. • Avoid using desensitizers, disinfectants, hydrogen peroxide, dentin sealants, rinsing solutions containing EDTA, etc., after final cleaning with aqueous pumice slurry and water spray. Their residues may have a detrimental effect on the bond strength and setting reaction of the cement. Hydrogen peroxide is a strong oxidizing agent that decomposes chemical initiating systems. Hydrogen peroxide is not easily removed from the tooth surface by a water spray. Generally, its use should be avoided with resin cements. • Make sure to pretreat the restoration as described in the RelyX™ Unicem cement instructions for use. For details see also Q3 and Q4.
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