Resistance Form Definition — NDEB AFK MCQ
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Correct answer: E — Dislodgement of the restoration by oblique or lateral forces and fracture of either the tooth or the restoration
Resistance form comprises the features of a cavity preparation that resist dislodgement of the restoration by oblique/lateral forces (not along the path of insertion) and fracture of either the remaining tooth structure or the restoration itself. Key resistance form features include: flat pulpal/gingival floors perpendicular to occlusal forces, adequate bulk of remaining tooth structure, rounded internal line angles, and adequate preparation depth for material thickness. Retention form (distinct from resistance form) resists displacement along the path of insertion.
Reference: Heymann – Sturdevant's Art and Science of Operative Dentistry, 7th ed., 2019