Class III Interceptive Orthodontics — MFDS Part 1 MCQ

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ModerateOrthodontic PrinciplesClass III Interceptive OrthodonticsMFDS Part 1

A child has a developing skeletal Class III relationship caused predominantly by maxillary retrusion and is suitable for interceptive treatment with a protraction facemask. When is this treatment generally most appropriately commenced?

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Correct answer: B — Before 10 years of age, during the early mixed dentition

The correct answer is B. Protraction facemask therapy is an interceptive orthopaedic treatment for a growing child whose Class III relationship is caused predominantly by maxillary retrusion. UK randomised-trial evidence supports treatment before 10 years of age, corresponding commonly to the early mixed dentition. This permits modification of the developing maxillary relationship and early correction of a reverse overjet. Routine treatment in the primary dentition is not required merely to start as early as possible. Commencement at 12–14 years offers less remaining opportunity for orthopaedic modification, while treatment near or after growth completion is too late for conventional growth modification. Residual or progressive skeletal discrepancy may subsequently require comprehensive orthodontic treatment or, in severe cases, orthognathic surgery.

Reference: Mandall NA et al. Is early Class III protraction facemask treatment effective? A multicentre, randomized, controlled trial: 3-year follow-up. Journal of Orthodontics. 2012;39:176–185. https://pubmed.ncbi.nlm.nih.gov/22984102/