Orthodontic screw for a fast expansion on the anterior sector of the maxillary arch

摘要

The apparatus for obtaining an at least prevailing or even exclusive expansion in the anterior sector of the maxillary arch two substantially symmetrical components (1, 3) with arms (11, 12; 31, 32) fan-like stretching apart and to be combined with orthodontic bands (40); the two components (1, 3) are articulated to one another by means of a hinge (5); an expansion screw (7) acting between the two components (1, 3) is able to stretch them angularly apart by progressive actions to be exerted on the same screw.