Statement of problem. Regardless of the type of indirect restoration being fabricated, optimizing fit at cementation is a challenge. Several disclosing agents have been recommended to identify intaglio surface contacts that may result in incomplete seating and poorly adapted margins. The International Organization for Standardization has established a standard of 25 pm for the maximum film thickness for water-based cements. To accurately predict the clinical behavior of a luting cement, the disclosing agents themselves should have a film thickness no greater than 25 pm.
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