ortho the international C.E. magazine of orthodontics

18 I I C.E. article_ Bent Wire System ortho2_2012 Fig. 9c Fig. 9d Fig. 9a Fig. 9b was finalized with the Myobrace Regular™ from MRC,fixedappliancesontheupperarchwouldpossi- bly have delivered quicker results following the BWS OrthodonticSystem.Theassistanceofcorrectingthe forces delivered by the muscles of the cheek (bucci- nator)andlips(orbicularisoris)atswallowingcannot beignoredandisakeypartofthemodusoperandiof this expansion system. After two years of treatment and observation, alongwithnight-timeretentionusingthei-2Trainer for 12 months after treatment, the BWS produced enoughupperarchdevelopmenttonotonlyaccom- modate the erupting canines but also achieve lower anterior alignment with minimal intervention and minimal retention (Fig. 9a–9d). This case was a more extreme example that orthodontists will face in the future as more parents demand the non-extraction option with minimal use of multi-bracket systems. _Conclusions Maxillary and mandibular expansion has been shown to be an excellent alternative to increase the arch perimeter and, thus, to avoid the need for extractions to properly align teeth. This paper has presented two cases treated using the BWS Ortho- dontic System, which involves the combination of two appliance systems: the Trainer, a pre-fabricated functional appliance, and the BWS. Bothappliances,TrainerandBWS,havetobeused in order to get the results reported in this paper. The BWS Orthodontic System, as shown in these two cases and in many cases treated by the authors, is an excellent means to produce arch development in both upper and lower dental arches in a short time. The effect of the BWS Orthodontic System on arch development does not change the inter-maxillary relationship when a Class I occlusion exists at the beginning of treatment. However,whenaClassIImalocclusionassociated to a crowded dentition is present, the BWS Ortho- ‘Maxillary and mandibular expansionhasbeenshownto be an excellent alternative to increase the arch perimeter.’