Three-dimensional Changes Of Maxilla After Rapid Maxillary Expansion

Objective:Rapid maxillary expansion is more commonly used as a clinical treatment approach, which uses mechanical separation of Orthopedic Force raphe palate, maxillary arch expansion to the treatment of maxillary arch stenosis, before and after crossbite combined, maxillary protrusion and crowding of teeth and so on. Previous research on the RME are generally lateral skull X-ray measurement and model combination methods, and should not view on the side RME jaw after treatment at three-dimensional direction on the location and angle changes. Previous research on the RME are generally lateral skull X-ray measurement and model combination methods, and should not view on the side RME jaw after treatment at three-dimensional direction on the location and angle changes.Methods:Select All eight patients with permanent teeth, the average age of 12.3 years old, 11.2-year-old one of the smallest, the largest 14,0 years old, single, bilateral posterior crossbite combined or crowded teeth. Through the wearing of spiral Express expansion device to correct posterior crossbite combined or crowded teeth. Through the use of multi-storey Hopewell CT3D imaging in patients with permanent teeth (RME) of mandible before and after treatment on the measurement points at missing-like direction, vertical direction and horizontal direction on the location and angle changes. Pairs signed rank test using the comparative analysis of the data.Result:After RME treatment, the measurement points on mandible ANS, PNS ', PNS and Or in the Shaped the direction of missing on both forward and downward movement; Maxilla palatal angle did not change significantly. Palatine raphe showed before and after the Department of narrow, wide between similar spindle shape. Coronal plane from the observation, on the expansion of the upper mandible 0.92 mm.Conclusion:On mandibular position at RME before and after the loss of shape to the vertical to the competent happened to the three directions are the corresponding changes. 1. Maxilla after RME treatment, the measurement points at the median sagittal plane occurred forward, downward displacement on the hard palate and jaw on a horizontal plate at the middle sagittal plane clockwise happen. 2.RME after treatment of the upper jaw on the extent of the expansion of the lower mandible is less than the expansion of the degree. Observation from the coronal plane, showing the pyramid-shaped. At the level of the surface of observation, before and after palatal raphe widening a lesser extent, parts of central parts of the palate orthognathic raphe widening slightly larger extent, showing spindle- shaped.