[Treatment of lateral cross-bite with active plates in conditions of raised dental occlusion and by the quad-helix method].

The purpose of the paper was to estimate the effects of the fixed elevation of occlusion on lateral cross-bite treatment. There was also comparative studies in the group of children treated with the quad-helix appliances. Own results were obtained from the studies of 36 children with lateral cross-bite whose occlusions were regulated. The children were divided into 3 groups:--in the first group 13 children had the occlusion arised with the metal dental crowns widened by metal flat surface on the buccal side. They were cemented on first permanent upper molars (Fig. 1);--in the second group 12 children had the occlusion arised by the mass type "Composite" covering first permanent lower molar teeth (Fig. 2); in both groups children were treated by upper active plate;--in the third group 11 children had the appliance quad-helix used to widen the upper dental arch (Fig. 3). The obtained results (Tax. 1-4) show that stable elevation of the occlusion makes the treatment shorter, especially in the children where the cooperation is worse. For the patients with bigger narrowness of the upper dental arch it is directed to raise the occlusion with the metal dental crowns with flat widened surfaces. In the cases when the narrowness is smaller it is sufficient to raise the occlusion by the mass type "Composite" (Fig. 2). The quad-helix appliance is the most effective method of the treatment in the case of deciduous and mixed teeth, because the time of treatment is short. In the treatment of lateral cross-bites the most important matter is to liquidate the disproportion between the width of the upper and lower dental arches (by widening the maxillae) and to obtain the regular bite.