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BSI Class II Div 2 — ORE Part 1 MCQ

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EasyOrthodonticsBSI Class II Div 2ORE Part 1

A 12-year-old has a traumatic deep overbite: the lower incisors contact the palatal mucosa behind the upper incisors. The maxillary incisors are retroclined. Which British Standards Institute (BSI) incisor classification is most likely?

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Correct answer: B — Class II division 2

The correct answer is **Class II division 2**. Its defining incisor pattern is retroclined maxillary incisors with an increased, often deep, overbite. In this case, the overbite is severe enough for the lower incisors to traumatise the palatal mucosa, supporting a traumatic deep bite. Class II division 1 is the main distractor, but it is characterised by proclined rather than retroclined upper incisors, usually with increased overjet. Class I does not describe this characteristic Class II incisor pattern, while Class III would usually involve a negative overjet or anterior crossbite. The presentation is therefore classifiable and not unclassifiable.

Reference: Cochrane Oral Health. Orthodontic treatment for deep bite and retroclined upper front teeth in children. 2018. https://pubmed.ncbi.nlm.nih.gov/12071609/