Use of Acid for Oxide Layer Removal of Overcast UCLA Abutments: Influence on Fit and Roughness.

Purpose: The objective of this study was to evaluate the influence of the oxide layer removal procedure using acid on the roughness and internal fit of overcast universal castable long abutments (UCLAs) for a taper connection.

Materials And Methods: For this, maxillary first premolars were waxed on the plastic sleeve of 15 UCLAs with a premachined interface. The specimens were overcast using the NiCr alloy, and the frameworks were randomly distributed to undergo one of two different oxide layer removal methods: blasting with 100-μm particles of aluminum oxide at 0.