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Transverse effect of Haas and Hyrax appliances on the upper dental arch in patients with unilateral complete cleft lip and palate: A comparative study
Façanha, Anna Júlia de Oliveira; Lara, Tulio Silva; Garib, Daniela Gamba; Silva Filho, Omar Gabriel da.
  • Façanha, Anna Júlia de Oliveira; São Paulo University.
  • Lara, Tulio Silva; São Paulo University.
  • Garib, Daniela Gamba; São Paulo University.
  • Silva Filho, Omar Gabriel da; São Paulo University.
Dental press j. orthod. (Impr.) ; 19(2): 39-45, Mar-Apr/2014. tab, graf
Article in English | LILACS | ID: lil-714620
ABSTRACT

Objective:

The aim of the present study was to evaluate the transverse effect of rapid maxillary expansion in patients with unilateral complete cleft lip and palate while comparing the Haas and Hyrax appliances.

Methods:

The sample consisted of 48 patients divided into two groups Group I - 25 patients treated with modified Haas appliance (mean age 10 years 8 months); and Group II - 23 patients treated with Hyrax appliance (mean age 10 years 6 months). Casts were taken during pre-expansion and after removal of the appliance at the end of the retention period. The models were scanned with the aid of the 3 Shape R700 3D scanner. Initial and final transverse distances were measured at cusp tips and cervical-palatal points of maxillary teeth by using the Ortho Analyzer(tm) 3D software.

Results:

The mean expansion obtained between cusp tips and cervical-palatal points for inter-canine width was 4.80 mm and 4.35 mm with the Haas appliance and 5.91 mm and 5.91 mm with the Hyrax appliance. As for first premolars or first deciduous molars, the values obtained were 6.46 mm and 5.90 mm in the Haas group and 7.11 mm and 6.65 mm in the Hyrax group. With regard to first molars, values were 6.11 mm and 5.24 mm in the Haas group and 7.55 mm and 6.31 mm in the Hyrax group.

Conclusion:

Rapid maxillary expansion significantly increased the transverse dimensions of the upper dental arch in patients with cleft palate, with no significant differences between the Hass and Hyrax expanders. .
RESUMO

Objetivo:

avaliar o efeito transversal na arcada dentária superior do procedimento de expansão rápida da maxila em pacientes com fissura transforame incisivo Aunilateral, comparando os expansores tipo Haas modificado e de Hyrax.

Métodos:

a amostra constou de 48 pacientes divididos em dois grupos grupo I, 25 pacientes que utilizaram o aparelho expansor tipo Haas modificado, com média de idade de 10 anos e 8 meses; e grupo II, 23 pacientes que utilizaram o Hyrax, com média de idade de 10 anos e 6 meses. Modelos de gesso foram realizados na fase pré-expansão e após 6 meses de contenção, após a remoção do aparelho. Os modelos foram digitalizados com auxílio do scanner 3Shape R700 3D e as distâncias transversais iniciais e finais foram medidas entre as pontas de cúspides e pontos cervicopalatinos de dentes superiores pelo método digital no software OrthoAnalyserT 3D.

Resultados:

a média de expansão obtida entre as pontas de cúspides e entre os pontos cervicopalatinos, respectivamente, para a distância intercaninos, foi de 4,80mm e 4,35mm para o Haas e de 5,91mm e 5,91mm para o Hyrax; 6,46mm e 5,90mm para os primeiros molares decíduos ou primeiros pré-molares no grupo Haas, 7,11mm e 6,65mm no grupo Hyrax; e 6,11mm e 5,24mm para os primeiros molares no grupo Haas e 7,55mm e 6,31mm no grupo Hyrax.

Conclusão:

o procedimento de expansão rápida da maxila produziu aumentos significativos das dimensões transversais da arcada dentária superior em pacientes com fissura, sem diferenças significativas entre os expansores Haas modificado e Hyrax. .
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Palatal Expansion Technique / Cleft Lip / Cleft Palate / Orthodontic Appliance Design / Dental Arch / Maxilla Type of study: Controlled clinical trial / Observational study Limits: Adolescent / Child / Humans Language: English Journal: Dental press j. orthod. (Impr.) Journal subject: Orthodontics Year: 2014 Type: Article Affiliation country: Brazil

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Full text: Available Index: LILACS (Americas) Main subject: Palatal Expansion Technique / Cleft Lip / Cleft Palate / Orthodontic Appliance Design / Dental Arch / Maxilla Type of study: Controlled clinical trial / Observational study Limits: Adolescent / Child / Humans Language: English Journal: Dental press j. orthod. (Impr.) Journal subject: Orthodontics Year: 2014 Type: Article Affiliation country: Brazil