Modification of the maxillary of children from 8 to 12 years after the use of Hyrax

Abstract

Transverse compression or hypoplasia of the maxilla is a common problem in children, which could be treated at an early age; however, when left untreated during growth and development, it would cause alterations in the cranio-cervical maxillofacial region, evidenced in the esthetics and function of the stomatognathic system. Therefore, the adequate treatment is the expansion of the maxilla, for which there are several published methods, in this sense, the hyrax disjunctor has been proposed since the early 1800's with different criteria on benefits and risks. The objective was to establish the changes in the maxilla of children from 8 to 12 years of age after the use of Hyrax. The literature was selected through a search in the electronic databases: Pubmed, Lilacs, Google Scholar, Proquest, Web of Science, the search was restricted to articles published from January 2011 to January 2023 with the inclusion of all languages. The review yielded a total of 499 articles, after applying the inclusion and exclusion criteria, 23 articles were obtained and reviewed. The available literature revealed that the main changes that occur after the use of Hyrax in children aged 8 to 12 years with transverse compression of the maxilla are a significant increase in the intercanine width and intermolar width, followed by a debated expansion of the maxilla (bony separation of the maxillary bones), however, the authors recommend caution about these results because they do not present homogeneity in the sample and methodological rigor in several of the studies analyzed.