Bone changes on lateral cephalograms and CBCT during treatment of maxillary narrowing using palatal osteodistraction...

The most common problem in surgical and orthodontic treatment involves abnormal transverse dimension of the maxilla. Behaviour of the facial skeleton in its anterior-posterior dimension during treatment of maxillary narrowing using surgical assist is interesting to observe. Assessment of bone changes of the maxillary location assessed on lateral cephalograms and CBCT during surgically assisted maxillary expansion with bone-anchored appliances. The analysed material included documentation of 78 patients, the mean age of 16.86±2.65, treated with transverse maxillary distraction using a bone-anchored appliance. The software (Dolphin Imaging) was used to measure parameters on lateral cephalograms. Results obtained analysis of correlation between planes, angles and diameters between teeth before and after treatment. Simple Regression - SNA vs. SN-OCCL change of the anterior height with regard to changes in the occlusal angle refer to the opening and dropping of the maxilla in the anterior section. Simple Regression - SNA vs. S-PNS-ANS describe changes in the anterior section such as opening of the S-PNS-ANS angle, and in a correlation with the SNA angle opening it indicates maxillary dropping and protrusion. Dropping and protrusion of the maxilla can be observed during surgically assisted maxillary expansion with bone-anchored appliances. Maxillary anterior movement may depend on a surgical procedure.