cross bite การใช้

• A quad helix expander is usually given to those who have a narrow top jaw, a cross bite and / or crowded teeth.
• They are often used to correct underbites, as well as malocclusions, overbites, open bites, deep bites, cross bites, crooked teeth, and various other flaws of the teeth and jaw.
• While there are some cases in which early intervention is useful _ particularly in correcting cross bites like William's _ in other cases waiting until a child is older works just as well, the critics say.
• "There was this key and my dad had to turn it every night, " said William, a third grader at the Trevor Day School in Manhattan, as he recalled the " palatal expander " he had to correct a cross bite _ his upper jaw fit inside his lower jaw.