Effects Of Maxillary Molar Distalization On Dental And Maxillofacial Vertical Dimension

It is well known that Class Ⅱ malocclusion is one kind of common malocclusion for its incidence in Chinese juvenile is 23%. According to etiopathology, it can be classified into two types: dental and skeletal malocclusion. Nowadays, distalization of maxillary molar is an important and effective technique to correct Class Ⅱ dental malocclusion and moderate space deficiency in upper arch. At present, the sagittal changes caused by distalization of maxillary molar are highlighted by domestic and foreign orthodontists. However , the study of vertical effects of maxillary molar distalization is rare. In fact , the vertical relationships of occlusion and jaws are as important as sagittal and horizontal relationships in clinical treatment. ObjectiveRetrospective study and clinical study were conducted to examine whether distalization of maxillary molar can change vertical relationships of occlusion and jaws and also explore the relative mechanism, in this way to provide theoretical foundations for clinical indication and treatment principle.Methods and Results Part 188 patients (48 females, 40males) with Class Ⅱ malocclusions treated by distalization of maxillary molar were collected, and matched t-test was used to compare 5 cephalometric vertical indexes of pretreatment and posttreatment. Then F-test and two group t-test were carried out to verify the factors mentioned by present documents.The results were that the overbite of the 88 patients showed statistically significant decreases of 2.86±2.69mm with no significant...