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Fig. 1 | Head & Face Medicine

Fig. 1

From: Success and complication rate of miniscrew assisted non-surgical palatal expansion in adults - a consecutive study using a novel force-controlled polycyclic activation protocol

Fig. 1

a-k Example of maxillary expansion with a MICRO-4 device in a 33.8 y a M4 and M5 positions for the orthodontic miniscrews b After placement, both screws on each side were connected with alastic chains. c This serves as a bridge to cover the screw heads with light curing resin to assure stability during 3 months of osseo-integration d MICRO-4 device with small hex nut e Initial occlusal x-ray f After reaching maximum opening of the jackscrew, the MICRO4 expander was removed and the small hex nut exchanged against a wider one g The same device was reinserted to continue the expansion procedure without the need of appliance reconstruction (in this case the right M5 orthodontic miniscrew needed to be relocated and the expander slightly adapted) h Final occlusal x-ray after expansion stop i Two year retention with bone-borne TPA. The orthodontic miniscrews in position M5 removed after insertion of TPA

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