Attrition vs Erosion — NDEB AFK MCQ
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Correct answer: D — Attrition is tooth-to-tooth contact wear; erosion is chemical dissolution of tooth structure by non-bacterial acids
Attrition is the loss of tooth substance due to direct tooth-to-tooth contact during mastication and parafunctional habits (bruxism). It produces flat, shiny wear facets on occlusal/incisal surfaces. Erosion is the chemical dissolution of tooth structure by non-bacterial acids (dietary acids, gastric acid in GERD/bulimia, acidic beverages). It produces smooth, scooped-out concavities. Abrasion is mechanical wear from an external agent (toothbrush, habits). Abfraction is stress-related cervical lesions.
Reference: Heymann – Sturdevant's Art and Science of Operative Dentistry, 7th ed., 2019