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Sagittal parallelism of midpalatal suture opening obtained with MSE. a Borders of the midpalatal suture (yellow lines) moving almost perfectly parallel to each other; amount of split at PNS (4.3 mm) was 90% of that at ANS (4.8 mm). b Position of MSE in the posterior part of the palate, providing an expansion force (red arrows) in line with the zygomatic buttress bones, which represent a major resistance to the movement of maxillary halves
