skip to main content

Enamel Bevel Purpose — NDEB AFK MCQ

Instant feedback + full explanation. One question, done properly.

ModerateRestorative DentistryEnamel Bevel PurposeNDEB AFK

What is the primary reason for bevelling the cavosurface margin of an enamel preparation for a Class IV composite restoration?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: B — To increase the surface area and expose more enamel rod ends for bonding

Bevelling the enamel cavosurface margin (typically 0.5-2 mm at a 45° angle) in a Class IV composite preparation serves two purposes: (1) it increases the available enamel surface area for acid etching and bonding (exposing more enamel rod ends); and (2) it creates a graduated transition zone where the composite thickness tapers, improving the aesthetic blend between composite and enamel (reducing the visible margin line). Bevels are generally NOT placed in Class II preparations as they create thin, unsupported enamel at the gingival margin.

Reference: Heymann – Sturdevant's Art and Science of Operative Dentistry, 7th ed., 2019