1.The ralationship between dental crowding and periodontal destruction. Research shows that people who have excellent oral or very poor have no correlation between the crowded teeth and the extent of the damage on periodontal. But for the person whoes oral health is not so good, then their irregular and crowded teeth will have a close relationship with the damaged periodontal, so for the person whose oral is health, dental orthodontic treatment will good for the protection of their periodontal health. 2.Effect of orthodontic braces on the gums. If orthodontic physicians can remove the excess adhesive that glued on the bracket carefully, and the patients can maintain their oral hygiene well, then the majority of using trends in patients with adhesive techology, their gums only have a mildly inflammation. When using fixed appliance in clinical, with possible conditions, try to use bonding directly can reduce the use of the band. 3.Effect of orthodontic force on periodontal health. When orthodontic force on teeth to move and pressure into move, the plaque of upper gingiva will move to subgingival, the junctional epithelium into periodontal pocket epithelium, leading to loss of adhesion. When the overall teeth move, the plaque of upper gingiva will not increase the process of gums infection, so the range of physiological in the orthodontic does not lead to teeth week, but some type of teeth movement will leading to the upper gingiva move to subgingiva, then damage teeth.
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