Sagittal and vertical maxillary effects after surgically assisted rapid maxillary expansion (SARME) using Haas and Hyrax expanders

Sagittal and vertical maxillary effects after surgically assisted rapid maxillary expansion (SARME) using Haas and Hyrax expanders

Author Bretos, José Luis Gonçalves Autor UNIFESP Google Scholar
Pereira, Max Domingues Autor UNIFESP Google Scholar
Gomes, Heitor Carvalho Autor UNIFESP Google Scholar
Hino, Claudia Toyama Autor UNIFESP Google Scholar
Ferreira, Lydia Masako Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract The purpose of this study was to evaluate the effect of surgically assisted rapid maxillary expansion on the sagittal and vertical maxillary planes. Thirty-three adult patients aged between 18 and 40 years who required surgically assisted rapid maxillary expansion were included in this study. They were divided into two groups: the Haas type expander (16) and the Hyrax type expander (17). All patients were subjected to subtotal LeFort I osteotomy with pterygomaxillary disjunction. Lateral cephalometric radiographs were taken during the preoperative assessment (T1), soon after completion of the expansion (T2), and 4 months after the end of the expansion (T3) The following cephalometric measures were obtained in each of the three radiographs for all the patients: SNA, SN palatal plane, Frankfurt horizontal plane. NA, CF-A, CF-NA, Nperp-A, CF-A, Frankfurt horizontal plane-ANS, and Frankfurt horizontal plane-PNS. Statistically significant changes were observed in the cephalometric measures: SNA, Frankfurt horizontal plane, NA, Nperp-A in the patients in the Haas group, and CF-A in the patients in the Hyrax group, demonstrating anterior displacement of the maxilla. The cephalometric measures SN.palatal plane, CF-A, CF-NA, Frankfurt horizontal plane-ANS, and Frankfurt-PNS plane that evaluated vertical displacement did not show changes in either group. The surgically assisted rapid maxillary expansion caused anterior displacement of the maxilla in both groups, but only the Haas group had statistical significance. Neither the Haas group nor the Hyrax group showed vertical displacement of the maxilla. When Hyrax and Haas groups were compared, there were no statistically significant differences for sagittal and vertical changes.
Keywords surgically assisted rapid maxillary expansion
rapid palatal expansion
Haas appliance
Hyrax appliance
Language English
Date 2007-11-01
Published in Journal Of Craniofacial Surgery. Philadelphia: Lippincott Williams & Wilkins, v. 18, n. 6, p. 1322-1326, 2007.
ISSN 1049-2275 (Sherpa/Romeo, impact factor)
Publisher Lippincott Williams & Wilkins
Extent 1322-1326
Origin http://doi.org/10.1097/scs.0b013e3180a772a3
Access rights Closed access
Type Article
Web of Science ID WOS:000251517500012
URI http://repositorio.unifesp.br/11600/44339

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