Review the photograph. A maxillary central incisor has been prepared with minimal proximal reduction, an indistinct finish line, and an open proximal contact, while the adjacent teeth are well aligned with good contacts. For which restoration was this tooth prepared?

Correct answer: C. A porcelain veneer

• A. A PFM crown requires the greatest reduction of all: a 1.2–1.5 mm facial shoulder to accommodate metal plus opaque plus porcelain, with a clearly defined margin.
• B. A full-ceramic crown requires circumferential reduction of 1–1.5 mm on all axial surfaces with a definite chamfer or shoulder margin and complete elimination of proximal contacts — far more aggressive than shown.
• C. CORRECT. The features are those of a VENEER preparation: reduction confined largely to the FACIAL surface, minimal proximal extension that stops short of breaking the contact, conservation of the lingual and incisal tooth structure, and a shallow, indistinct facial finish line. Typical facial reduction is only 0.3–0.7 mm, which is exactly why the margin appears so subtle.
• D. A resin-bonded bridge retainer is prepared on the LINGUAL surface with proximal wraparound, leaving the facial surface untouched — the opposite of what is shown.