Winter Classification — MFDS Part 1 MCQ

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EasyOral Surgery PrinciplesWinter ClassificationMFDS Part 1

The Winter classification describes the angulation of an impacted mandibular third molar relative to the adjacent second molar. What is meant by a mesioangular impaction?

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Correct answer: B — The crown is tilted mesially towards the second molar

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

A is correct. Winter classification describes the inclination of the impacted third molar relative to the long axis of the adjacent second molar. In a mesioangular impaction, the crown of the third molar is inclined mesially, towards the distal surface of the second molar. A distoangular impaction has the opposite inclination, with the crown directed distally. Horizontal and vertical describe the corresponding orientation of the tooth's long axis, while an inverted impaction has the crown directed inferiorly. Angulation alone should not be used to predict extraction difficulty, which also depends on depth, available ramus space, root morphology and proximity to the inferior alveolar canal.

Reference: Gokalp H, Erdem MK. Assessing position changes of impacted third molars in treatment of class II malocclusion with premolars extraction. Acta Odontologica Scandinavica. 2024; Figure 2: Winter's classification. https://pubmed.ncbi.nlm.nih.gov/39382487/