Active fixed appliances designed to widen the maxillary arch using a screw that is opened in prescribed daily increments. These appliances are usually utilized prior to treatment with braces to permanently correct narrow, crowded arches and create additional space into which the teeth can be moved.
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The following is about Expanders Sagittal Screw Appliance related, I hope to help you better understand Expanders Sagittal Screw Appliance.
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The use of an Rapid Palatal Expander is the most commonly used form of transverse arch development and can be fabricated by using either a 2 or 4 band design or can be bonded using acrylic or a bioformed material. The screw variations come in a variety of sizes, depending on the desired amount of expansion needed, and configurations, either 2 or 4 arms. Recent developments have even led to screws that provide an audible "click" sound or feel to let the patient know when the proper amount of activation has been made.
The following is about Pendulum Appliance related, I hope to help you better understand Pendulum Appliance.