Written by : Dr. Rania Alraddadi.
Another topic that we constantly discuss is the effect of rapid maxillary expansion on the vertical dimension.
It was shown that in the long term the side effects on the vertical dimension are actually minimum.
Here is a systematic review:
http://libdigi.unicamp.br/document/?down=32604 that argues the real long term benefits claimed by bonded RPE users.
According to them, even after the use of bonded RPE, some vertical adverse effects are inevitable. They explained that the vertical change is not caused by buccal tipping of maxillary molars only (which can be controlled by using bonded RPE) but also caused by the whole maxilla being displaced downward. So it was suggested that in cases where vertical dimension is critically sensitive, the use of vertical pull chin cup (or I would also add high pull HG) might be an option.