Metric Space. A metric space is a set with a global distance function (the metric) that, for every two points in, gives the distance between them as a nonnegative real number. A metric space must also satisfy. 1. iff, 2. , 3. The triangle inequality.
PAYING FOR INVISALIGN TREATMENT. Many dental insurance plans cover Invisalign treatment just as they would other orthodontic treatments like metal braces. Plans may cover up to $3,500 of Invisalign treatment. Talk to your Invisalign-trained doctor or insurance provider to find out how much youâre covered for.
Disadvantage of Invisalign in comparison to conventional orthodontic treatment include cost and technical limitations in handling complex cases. In a typical case, conventional braces may cost $4,000 in the United States, while Invisalign would cost $5,600; insurance may cover $1,000 of either treatment.