Traumatic Deep Overbite — ORE Part 1 MCQ

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ModerateOrthodonticsTraumatic Deep OverbiteORE Part 1

A 50-year-old patient presents with a deep bite (increased overbite) and pain from the lower incisors contacting the palatal mucosa behind the upper incisors, causing traumatic ulceration. What is the term for this condition?

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Correct answer: C — Traumatic deep overbite

Explanation lettering: E = shown as A · A = shown as C · C = shown as D · D = shown as E

The correct answer is A: Traumatic deep overbite. A deep overbite is defined as vertical overlap of the upper and lower incisors exceeding half the lower incisal height. When this causes soft tissue trauma (as evidenced here by palatal ulceration), it is termed 'traumatic deep overbite' or 'deep traumatic overbite'—recognised in UK national guidance (NHS England Grade 4f). This is distinct from Class II Division 2 malocclusion (B), which is an Angle sagittal classification describing molar and incisor position relationship, not overbite depth or trauma. Anterior open bite (C) describes anterior vertical separation, the opposite of the deep bite presented. Prognathic mandible (D) refers to forward jaw position, and reverse overjet (E) denotes Class III anteroposterior relationship—neither relates to overbite trauma.

Reference: NHS England Orthodontic Assessment and Treatment Need Quick Reference Sheet (2014), Grade 4f: 'Increased and complete overbite with gingival or palatal trauma'; and Jain et al., British Dental Journal (2012), 'The restorative management of the deep overbite', confirming soft tissue trauma as a recognised sequela of deep overbite. https://www.england.nhs.uk/south/wp-content/uploads/sites/6/2014/09/ortho-referral-quick-reference-sheet.pdf