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Intra-maxillary elastics are elastics used in one arch only, either mandibular or maxillary. People using elastics for orthodontic correction change their elastics three to four times during the day. Elastic wear is recommend to be used in a rectangular wire to minimize side effects. Elastic wear depends on the compliance of the patient. A non ...
Components such as Palatal Finger Springs, Buccal Canine Retractor, Z-Spring, T-Spring, Coffin Spring, Active Labial Bows (Mill's Bow or Roberts retractor), Screws and Elastics are all considered to be active components of the removable functional appliances. If a spring is moving one tooth it is made of 0.5mm thick stainless steel wire.
As the elastics are flexible, up to six elastics may be used to provide various forward and sideways forces on the patient's teeth and arch, while still allowing the patient to open and close his or her jaw. Facemask or reverse-pull headgear shows preparation for fitting to a patient with a number of elastic bands into the patients mouth.
Their modification included creating construction bite which allowed the bite to open around 10-15mm beyond the postural rest position of the mandible. They believed that viscoelastic properties of soft muscles and elasticity of soft tissues were predominating ways of how muscular adaptation and changes in form happened.
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One of the earliest uses of anchorage came from Henry Albert Baker for his use of the intermaxillary anchorage or Baker's Anchorage. This type of anchorage involves using elastics from one jaw to the other, in the form of either Class 2 elastics (moving upper teeth back) where lower molar teeth serve as anchors, or Class 3 elastics (moving lower teeth back) where upper molars serve as anchors.
Proponents of tissue-borne expansion believe that more bodily movement and less dental tipping is produced when an acrylic palatal coverage is added to the appliance. They believe that forces are dissipated through the mucosa and teeth. One of the disadvantages of this type of appliance is it leading to irritation of palatal mucosa.
Anterior open bite resulted from tongue thrusting in a 24 y.o. patient. Anterior upper teeth are not touching their counterpart. Anterior open bite (AOB) is defined as a condition in which there is no contact and no vertical overlap of the lower incisor crown with the upper incisor crown when the mandible is in full occlusion. [19]
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