Teeth aligners have different categories according to different classification standards, as follows:
1, according to the position of the bonding of the aligners: divided into lip side and tongue side, lip side of the aligners are mostly standardized aligners, a small portion of the personalized customized, and tongue side of the aligners are basically customized production, the cost is higher;
2, according to the material: metal and ceramic, metal aligners strength and ceramic, metal aligners strength and ceramic. and ceramic, metal aligners are stronger and smaller, with less friction between the bracket and arch wire, which is more conducive to tooth movement. Ceramic brackets have the advantage of being more beautiful, but the strength is relatively low, the volume is larger, and the friction between the brackets and the archwires is larger than that of metal brackets;
3, according to the fixation method of the archwires: fixed orthodontic appliances can be divided into self-ligating brackets and non-self-ligating brackets.
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