http://www.intechopen.com/books/issues-in-contemporary-orthodontics/class-iii-high-angle-malocclusion-treated-with-orthodontic-camouflage-meaw-therapy-
Article (not public):
Evaluation of root resorption after the multiloop edgewise archwire (MEAW) appliance in patients with anterior open bites
Early in the 1970s, Young H. Kim, DDS, DMD, MS, developed the Multi-Loop Edgewise Archwire (MEAW) appliance in his Weston, Mass, practice. This appliance allowed him to treat open bites and other severe malocclusions with excellent clinical results.1
Meanwhile, in the Department of Orthodontics at Kanagawa Dental College, Sadao Sato, DDS, DDSc, was investigating the etiology of different malocclusions and concluded that the posterior occlusal plane was the primary determinant of mandibular position. However, Sato could not find an appliance that would control the occlusal plane in the manner he wanted. When he attended a course in 1985 given by Kim in Tokyo, he realized that with the MEAW appliance he could apply his principles of occlusal plane control to influence mandibular position. Sato and his colleagues developed mechanics with the MEAW appliance in which they were able to efficiently treat even the most severe malocclusions by controlling the maxillary occlusal plane in three dimensions.2
http://www.orthodonticproductsonline.com/2012/11/meaw-therapy/
MEAW negatives:
We commend the authors for their efforts in documenting their technique and agree that MEAW therapy appears to be an effective and efficient method to treat open bite. However, we feel that their conclusion that “correction of open bite obtained by the MEAW therapy was proven to be very stable” is overstated. http://www.ajodo.org/article/S0889-5406(01)70164-3/fulltext
The prevalence of severe root resorption based on the number of teeth was significantly higher in the group with extractions (P < 0.01). Longer use of a MEAW appliance and elastics also produced a significantly higher prevalence of root resorption (P < 0.05). On the other hand, the prevalence of severe root resorption was not significantly different between the subjects treated with or without surgery, but there was a significant increase when treatment time was prolonged (P < 0.05). A significant difference was found in the amount of root movement of the upper central incisors and the distance from their root apices to the cortical bone surface (P < 0.05). These are regarded as essential factors in the onset of root resorption. These results indicate that orthodontic treatment with extractions, long-term use of a MEAW appliance and elastics, treatment time, and distance of tooth movement are risk factors for severe root resorption. http://www.jove.com/visualize/abstract/21811005/association-between-root-resorption-incident-to-orthodontic-treatment
MEAW negatives:
We commend the authors for their efforts in documenting their technique and agree that MEAW therapy appears to be an effective and efficient method to treat open bite. However, we feel that their conclusion that “correction of open bite obtained by the MEAW therapy was proven to be very stable” is overstated. http://www.ajodo.org/article/S0889-5406(01)70164-3/fulltext
The prevalence of severe root resorption based on the number of teeth was significantly higher in the group with extractions (P < 0.01). Longer use of a MEAW appliance and elastics also produced a significantly higher prevalence of root resorption (P < 0.05). On the other hand, the prevalence of severe root resorption was not significantly different between the subjects treated with or without surgery, but there was a significant increase when treatment time was prolonged (P < 0.05). A significant difference was found in the amount of root movement of the upper central incisors and the distance from their root apices to the cortical bone surface (P < 0.05). These are regarded as essential factors in the onset of root resorption. These results indicate that orthodontic treatment with extractions, long-term use of a MEAW appliance and elastics, treatment time, and distance of tooth movement are risk factors for severe root resorption. http://www.jove.com/visualize/abstract/21811005/association-between-root-resorption-incident-to-orthodontic-treatment
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