RESUMEN
OBJECTIVE: The aim of this study was to compare the occlusal changes of rapid maxillary expansion (RME) and slow maxillary expansion (SME) in patients with unilateral complete cleft lip and palate (UCLP), by means of digital dental models. METHODS: Group RME was composed by 22 patients (13 males and 9 females), with mean age of 9.9 years, treated with rapid maxillary expansion with Hyrax appliance in Center 1. Group SME was composed by 29 patients (14 females and 15 males), with mean age of 10.7 years, treated with slow maxillary expansion with quad-helix appliance in Center 2. Digital dental models of the maxillary dental arch were obtained immediately pre-expansion (T1) and 6-month post-expansion (T2). Transversal distances, arch perimeter, arch length, palatal depth, palatal volume and posterior tooth inclination were digitally measured. Interphase and intergroup comparisons were performed with paired t-test and independent t-test, respectively. RESULTS: Intercanine expansion was 4 to 5mm in both groups, and increase in the intercanine distance was similar for both groups. RME group showed a greater increase in arch distances at the region of permanent premolar and molars, compared to SME group. Arch perimeter increase was greater for RME group, compared to SME. No differences were found for arch length, palatal depth, palatal volume and posterior tooth buccal tipping. CONCLUSION: RME and SME produced similar dentoalveolar outcomes, with greater amount of expansion on RME group.
Asunto(s)
Labio Leporino , Fisura del Paladar , Niño , Labio Leporino/diagnóstico por imagen , Labio Leporino/terapia , Fisura del Paladar/diagnóstico por imagen , Fisura del Paladar/terapia , Femenino , Humanos , Masculino , Diente Molar , Técnica de Expansión PalatinaRESUMEN
ABSTRACT Objective: The aim of this study was to compare the occlusal changes of rapid maxillary expansion (RME) and slow maxillary expansion (SME) in patients with unilateral complete cleft lip and palate (UCLP), by means of digital dental models. Methods: Group RME was composed by 22 patients (13 males and 9 females), with mean age of 9.9 years, treated with rapid maxillary expansion with Hyrax appliance in Center 1. Group SME was composed by 29 patients (14 females and 15 males), with mean age of 10.7 years, treated with slow maxillary expansion with quad-helix appliance in Center 2. Digital dental models of the maxillary dental arch were obtained immediately pre-expansion (T1) and 6-month post-expansion (T2). Transversal distances, arch perimeter, arch length, palatal depth, palatal volume and posterior tooth inclination were digitally measured. Interphase and intergroup comparisons were performed with paired t-test and independent t-test, respectively. Results: Intercanine expansion was 4 to 5mm in both groups, and increase in the intercanine distance was similar for both groups. RME group showed a greater increase in arch distances at the region of permanent premolar and molars, compared to SME group. Arch perimeter increase was greater for RME group, compared to SME. No differences were found for arch length, palatal depth, palatal volume and posterior tooth buccal tipping. Conclusion: RME and SME produced similar dentoalveolar outcomes, with greater amount of expansion on RME group.
RESUMO Objetivo: O objetivo do presente estudo foi comparar, por meio de modelos digitais, as alterações oclusais após a expansão rápida da maxila (ERM) e após a expansão lenta da maxila (ELM) em pacientes com fissura labiopalatina completa unilateral (FLPU). Métodos: O grupo ERM foi composto por 22 pacientes (13 homens e 9 mulheres), com idade média de 9,9 anos, tratados com expansão rápida da maxila com aparelho Hyrax no Centro 1. O grupo ELM foi composto por 29 pacientes (14 mulheres e 15 homens), com idade média de 10,7 anos, tratados com expansão lenta da maxila com aparelho quadri-hélice no Centro 2. Modelos digitais da arcada dentária superior foram obtidos imediatamente pré-expansão (T1) e seis meses pós-expansão (T2). Distâncias transversais, perímetro da arcada, comprimento da arcada, profundidade do palato, volume do palato e inclinação dos dentes posteriores foram medidos digitalmente. As comparações interfases e intergrupos foram realizadas com teste t pareado e teste t independente, respectivamente. Resultados: A expansão da arcada na região dos caninos foi de 4 a 5 mm em ambos os grupos, e o aumento na distância intercaninos foi semelhante nos dois grupos. O grupo ERM apresentou maior aumento nas distâncias entre pré-molares e molares permanentes, em comparação ao grupo ELM. O aumento do perímetro da arcada foi maior para o grupo ERM, em relação ao ELM. Não foram encontradas diferenças para comprimento da arcada, profundidade do palato, volume do palato e inclinação vestibular dos dentes posteriores. Conclusão: ERM e ELM produziram resultados dentoalveolares semelhantes, com maior quantidade de expansão no grupo ERM.