Effects of Miniscrew-assisted Rapid Palatal Expansion on Three-dimension Position of Maxilla
Objective:To research the sagittal and vertical changes of the maxilla after miniscrew-assisted rapid palatal expansion(MARPE)in adult patients.Methods:A retrospective study was performed on 45 adult patients who underwent miniscrew-assisted rapid palatal expansion,including 38 females and 7 males,with an average age of(21.7±3.4)years.By importing patients'CBCT data before and immediately after the expansion into the Dol-phin11.9 software and MIMICS21.0 software,after correcting the head position through Dolphin,the 3D recon-struction of the CBCT data is generated in MIMICS.The model was registered,and then the anterior nasal spines before and after the expansion of the palatal,the most anterior and inferior nasal bone end of the nasofrontal suture,the most anterior and inferior end of the nasal bone,the uppermost jaw end of the zygomaticomaxillary suture,the innermost frontal bone end of the zygomatic frontal suture,and the lowermost zygomatic bone end of the temporal zygomatic suture were fixed.The sagittal and vertical changes of above points before and after palatal expansion were measured and calculated.Results:After palatal expansion,in the sagittal and vertical direction,the anterior nasal spine was(0.52±0.58)mm forward and(0.49±0.93)mm downward on the left side,and(0.70± 0.86)mm forward and(0.41±0.97)mm downward on the right side,both of which were statistically significant(P＜0.05).The most anterior and inferior nasal bone end of the nasofrontal suture,the most anterior and inferior end of the nasal bone,the uppermost jaw end of the zygomaticomaxillary suture,the innermost frontal bone end of the zygomatic frontal suture,and the lowermost zygomatic bone end of the zygomatic temporal suture were general-ly backward 0.06 mm to 0.30 mm and upward 0.10 mm to 0.55 mm,most of which were statistically significant.Conclusion:When adult patients are treated with MARPE,the maxilla is moved forward and downward,and the adjacent structures above the maxilla are moved upward and backwards.
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