【Yang Yeh】評論

Ch13. Treatment of Skeletal Transverse and Class III Problems p444Class III Elastics to Maxillary and Mandibular MiniplatesIn the timing of treatment, two related factors are important. First, adequate bone density to retain the screws does not develop until approximately age 11; second, the mandibular bone plates should not be inserted until the permanent mandibular canines have erupted, which should not be a problem because they usually erupt at approximately 9 years of age. This means treatment with this method cannot begin until the patient is already too old for a good response to facemask therapy—but it also means that now there is a way to obtain excellent maxillary protraction for patients who are too old to hope for a good response to facemask therapy. With the skeletally anchored Class III elastics, a favorable growth response can be obtained throughout the adolescent growth spurt, so treatment for about 1 year between the ages 12 and 14 is the best plan.