Stability determinants of bone-borne force-transmitting components in three RME hybrid expanders—anin vitrostudy

Abstract

Early OMI and single wire arm deformation in HEs are crucial for unsuccessful RME in more mature maxillae. Double wire arms should be obligatory. OMIs with inner diameter greater 1.36mm are recommended. One hundred per cent overlapping abutment attachments do not detach.

Mini-implant assisted rapid palatal expansion: New perspectives

“…Double steel arms and mini-implants at least 1.8 mm in diameter to counter the resistance force since the resistance center is at a distance from the expansion force exerted 68 .…”

“…-Prevents mesialization of the anchor molars until the premolars erupt. In fact, the rigid structure connected to both mini-implants serves as a space maintainer, and acts as a Nance arch, thus preventing the molars from undergoing mesialization and stunting the development of definitive premolars 68 .…”

What are the limits of microimplant-assisted palatal expanders?

“…According to this study, hybrid expanders with dental anchorage and the assistance of 2 to 4 mini-implants should be used only in adolescent patients, not in adults. 4 In a study of 33 adults with pure BAME, 90% of the patients between 23 and 33 years (n 5 11) had successful palatal widening without SARPE and no dental side effects. 8 In this letter, we have focused on different types of anchorage for palatal expanders.…”

“…Pure bone-borne expanders 3,4 do not show any translational dental movements or buccal tipping 5 because no teeth are involved. After the expansion, they even show minor spontaneous palatal tipping 5 of the buccal teeth, as Carlson et al described for the maxillary canines only.…”

“…6 How much higher is the anchorage loss in older adults (.25 y) with more resistance against expansion due to more mature bone? 7 According to the examinations by Walter et al, 4 directly loaded titanium mini-implants with a diameter of 1.5 mm under these circumstances will undergo major deformations with the risk of breakage. According to this study, hybrid expanders with dental anchorage and the assistance of 2 to 4 mini-implants should be used only in adolescent patients, not in adults.…”