"UCLA" crowns are a term for implant crowns that screwed directly into an implant without any intermediate abutment. They can fabricated as temporary or permanent implant crowns. In my practice, when I am restoring an implant in the "esthetic zone"(Premolar- Pemolar) I utilize these as interim restorations in order to help develop a gingival contour around the crown. When the gingiva is mature, I will then take a fixture level impression and have a custom abutment and a permenent crown fabricated.
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