Crown Fracture — ORE Part 1 MCQ

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EasyRestorative DentistryCrown FractureORE Part 1

A patient presents with a fractured upper central incisor. The fracture involves enamel and dentine but the pulp is not exposed. There is no tenderness to percussion. What is the classification of this fracture?

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Correct answer: E — Uncomplicated crown fracture (Ellis Class II)

The patient's fracture involves enamel and dentine without pulp exposure, which defines Ellis Class II (uncomplicated crown fracture). Ellis Class I affects enamel only; Ellis Class II affects enamel and dentine without pulp exposure; Ellis Class III involves all three layers with pulp exposure. The absence of percussion tenderness suggests no pulp vitality compromise. The term 'uncomplicated' distinguishes this from 'complicated' (Class III) fractures that expose the pulp chamber. Crown-root fractures extend apical to the gingival margin and are classified separately. Enamel infraction is a microscopic crack without loss of tooth structure.

Reference: International Association of Dental Traumatology (IADT); Andreasen classification system as endorsed by WHO (Proposal #2130) and adopted in dental traumatology literature. Sources: PubMed 16499629, 36798551, 10234444. https://pubmed.ncbi.nlm.nih.gov/36643128/