cross bites 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.