CATEGORY AUSTRALASIAN DENTIST 53 LINICAL Classification 2. Intra-oral appliances ACCO appliance – acrylic cervical occipital anchorage u Intramaxillary u Palatal u Removable Bimetric distalizing arch with Class II elastics u Intermaxillary u Buccal u Fixed Cetlin appliance u Intramaxillary u Palatal u Removable Distal jet appliance u Intramaxillary u Palatal u Fixed Distalizing appliances One of the first appliances used for molar distalization was the Headgear, used by Angle in 1887. In 1968, Kloehn proposed the early treatment with the headgear to redirect the growth of the maxilla and exert a slight force on the teeth that must be moved. The objective of Kloehn was to distalize the upper molars in order to obtain a functional relation with the lower teeth. Graber noticed that, when extra-oral traction was used upon the first upper molar, considering the fact that the second upper molar had not fully erupted, the first molar inclined distally but did not move in a bodily manner. In order to prevent the inclination of the molar, Cetlin in 1983 combined the extraoral force with an intraoral force. He used the first force partially and the intraoral force (with removable appliances) was used full time. The force of the removable appliances, used constantly, inclines the crown distally and the headgear controls the position of the root, resulting in a bodily movement of the molar. The principle of extra-oral distalization is that the line of action must pass through the centreof resistanceof themolar. Inorder to accomplish a successful distalization treatment, the amount of force applied, and the time of use are very important. VARIOUS APPLIANCES USED FOR MOLAR DISTALIZATION 1. Extra-oral appliances Magnets u Intramaxillary u Buccal u Fixed Fixed piston appliance u Intramaxillary u Buccal and Palatal u Fixed First class appliance u Intramaxillary u Buccal and Palatal u Fixed Herbst appliance u Intermaxillary u Buccal u Fixed
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