PGCEE MDS 2022: The most unwanted side effect seen with Herbst appliance is:

 # The most unwanted side effect seen with Herbst appliance is:

A. Lower incisor proclination

B. Frequent breakage of the appliance

C. Downward rotation of palate

D. Mandible rotate anticlockwise

The correct answer is A. Lower incisor proclination.

The most unwanted side effects seen with Herbst appliance are: 

- More chance of labial tipping as well as proclination of mandibular incisors

- Retrusion of maxillary incisors

Reference: Pancherz H. Treatment of Class II malocclusions by jumping the bite with the Herbst appliance. A cephalometric investigation. Am J Orthod. 1979;76(4):423–442.