| Morphology of the palate with normal occlusion is the bases of the treatment methods for almost every kind of malocclusion with abnormal palate sharp. But there are several problems in the former studies. First , the exact stop time of palate growth is not sure. Second , the former researches study the sharp of palate only from two dimensions ,that is not full-scale. Third ,there are differences between different races in palate sharp. At last, methods of former researches have many faults such as not exact enough, destroy the model, can not repeat and so on. So, it is important to study the morphology of the palate of chinese people from three dimensions. Permanent anterior open bite is not a minority in malocclusion, and it has serious influence on mastication, deglutition , cutting, pronunciation and many other functions. On the other hand, the complicated etiology and mechanism, difficult diagnosis and therapy ,high relapse rate make open bite to be a big trouble in orthodontic clinic. But there are few researches about morphology of the palate with anterior open bite, and the results of these researches are much different from each other.So it will be profound to study the characteres of the palate with anterior open bite and its differerces with normal palate.Objective: To study the morphology characteristics in growth of palatal and provide standard datum in Xi'an residents with early normal permanent occlusion and open bite malocclusion in order to be helpful for clinical practice.Methods:We builded 3D model of normal permanent occlusion and open bite malocclusion with reverse energine technique,then measured them with Geomagic10.0 software on sagittal plane,frontal plane and horizontal plane. At last we compared each group by statistics method.Results:①In normal permanent occlusion groups,the intermolar distance was larger in males than in females.The hight of palate was increased with age increasing in males until 17 years old about 1.36mm.The palate size of female is stable. The angle of dissymmetry is about 2.14±1.74o.②In anterior open bite groups , we found that the palate inclination of the 15 to 17 years old male is bigger than the female with the same age about 3.3o.The palate inclination of the male increased from 29.9oto 35.5o. In the male groups, the hight of palate between canines decreased, but between premolars and first molars increased.In the female group, the maximal hight of palate increased about 2.3mm,and the inclination of palate increased about 3o.The hight of female palate between canines decreased, but between premolars and first molars increased. The changes of longth and width of both male and female palate have no statistical significance.③Both male and female with antirior open bite have the similar differences with the children who have normal occlusion in palate sharp:the palatal inclinasion is bigger in antirior open bite group; the maximal hight and the hight of palate between canines, premolars and first molars are bigger in the age of 16 -17 in antirior open bite group; the width between canines, premolars and first molars is smaller in antirior open bite group.Conclusions:①The size and the shape of the palate with normal occlusion was influenced by gender and age, especially in males. The maximal palate hight of male increased with age about 1.36mm.②The size and the shape of the palate with anterior open bite was influenced mainly by age.The palate inclination and hight of both male and female increased.③In sagittal plane,the palate with anterior open bite had bigger hight and bigger inclination than palate with normal occlution.In coronal plane, higher palatal vault and smaller palate width had been founded in anterior open bite malocclusion group. |
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