Cone-beam computed tomography evaluation of dentoskeletal effects produced by the bonded expander and hyrax: a pilot study

Authors

  • Guilherme de Araújo Almeida Universidade Federal de Uberlândia
  • Joana Cristina dos Santos Menezes Prática privada
  • Isadora Moraes Mundim Prado Universidade Federal de Uberlândia
  • Marina Guimaraes Roscoe Universidade de São Paulo
  • Asbel Rodrigues Machado Prática privada
  • Alfredo Júlio Fernandes Neto Universidade Federal de Uberlândia

DOI:

https://doi.org/10.14393/BJ-v32n3a2016-32319

Keywords:

Orthodontic Appliances, Palatal Expansion Technique, Malocclusion

Abstract

The dentoskeletal effects produced by the bonded expander, principally the vertical ones, are controversial in the literature when compared with the effects produced by the hyrax, and have also been scarcely studied by means of cone-beam computed tomography (CBCT). This study aimed to evaluate the horizontal and vertical dentoskeletal effects produced by the bonded expander and by the hyrax using CBCT. The study sample consisted of ten patients, divided equally into two groups according to facial and cephalometric features: group 1, vertical facial growth pattern (two males, three females; mean age,  7.7 years) and group 2, normal facial growth pattern (three males, two females; mean age, 8.3 years), treated by bonded expander and hyrax, respectively. The patients were subjected to a CBCT scan before expansion and another scan four months after the end of the activations, when the expander was removed. Within each group and between the groups the horizontal and vertical effects were assessed using Student's t-test. The sample size was predetermined, and 5 patients were needed in each group to detect the differences at P < 0.05 with 90% power. Among the horizontal changes assessed, the nasal floor width (P = 0.03) and the greater internal width in the posterior region (P = 0.00) showed a statistically significant increase only for group 1, and the mandibular molar verticality showed a statistically significant increase only for group 2. The vertical changes showed no statistical differences within groups (P > 0.05). Comparing the two groups there were no statistical differences for any assessed change (P > 0.05). Considering there were no differences of the effects between the appliances, the bonded expander produced no greater vertical control compared to the hyrax. Nevertheless, further study is recommended in a larger sample size using CBCT.

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Published

2016-06-01

How to Cite

ALMEIDA, G. de A., MENEZES, J.C. dos S., PRADO, I.M.M., ROSCOE, M.G., MACHADO, A.R. and FERNANDES NETO, A.J., 2016. Cone-beam computed tomography evaluation of dentoskeletal effects produced by the bonded expander and hyrax: a pilot study . Bioscience Journal [online], vol. 32, no. 3, pp. 796–804. [Accessed9 December 2022]. DOI 10.14393/BJ-v32n3a2016-32319. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/32319.

Issue

Section

Health Sciences