S-clasp with Apron Spring: A Single Tooth Crossbite Correction in Mandibular Arch

Posterior crossbite is one of the most prevalent malocclusions in the primary and early mixed dentition. Different techniques have been used to correct anterior and posterior crossbites in maxillary arch, for example quad helix and removable appliance with expansion screw. This article aims at correcting the single tooth crossbite in mandibular arch in cases where the mandibular molar is buccally positioned by a modified appliance, which includes a modified clasp and an apron spring that helps in correcting the abovementioned problem.