The effect of rapid maxillary expansion on pharyngeal airway pressure during inspiration evaluated using computational fluid dynamics

Iwasaki, Tomonori; Takemoto, Yoshihiko; Inada, Emi; Sato, Hideo; Suga, Hokuto; Saitoh, Issei; Kakuno, Eriko; Kanomi, Ryuzo; Yamasaki, Yuichi

doi:10.1016/j.ijporl.2014.05.004

Cited by 52 publications

(45 citation statements)

References 26 publications

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“…Accordingly, much attention has been paid to the influence of maxillofacial form on respiratory function during growth. [2][3][4][5] Some studies have suggested that a vertical growth pattern, with obstruction of the pharyngeal airway, is associated with mouth breathing. 6 Pharyngeal airway obstruction is expected to improve with forward jaw movement such as that after maxillomandibular advancement surgery 7 or the use of a mandibular advancement oral appliance.…”

mentioning

confidence: 99%

Three-dimensional cone-beam computed tomography analysis of enlargement of the pharyngeal airway by the Herbst appliance

Iwasaki

Takemoto

Inada

et al. 2014

American Journal of Orthodontics and Dentofacial Orthopedics

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mentioning

confidence: 99%

Three-dimensional cone-beam computed tomography analysis of enlargement of the pharyngeal airway by the Herbst appliance

Iwasaki

Takemoto

Inada

et al. 2014

American Journal of Orthodontics and Dentofacial Orthopedics

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“…Several studies have exposed the effects of the RME in the nasal cavity (FARRONATO et al, 2008;GARIB et al, 2005;IWASAKI et al, 2014). Additionally, this study performed measurements of nasal cavity in stages T1 and T2 of treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have addressed the dentoskeletal effects of these expander appliances (AKYALCIN et al, 2013;ASANZA et al, 1997;BAYSAL et al, 2013;FARRONATO et al, 2008;GARIB et al, 2005;GARRETT et al, 2008;IWASAKI et al, 2014;LAGRAVÈRE et al, 2010;REED et al, 1999;RODRIGUES et al, 2012;SARVER;JOHNSTON, 1989), however, the comparison between them still remains controversial, especially regarding to the vertical effects. Some authors concluded that the bonded expander increases the transverse dimension of the maxilla, but limits or even eliminates changes in vertical dimension (ASANZA et al, 1997;SARVER;JOHNSTON, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Most evaluations of dentoskeletal effects of RME with bonded expander were performed through the analysis of dental casts and cephalometric radiographs (ASANZA et al, 1997;IWASAKI et al, 2014;REED et al, 1999;SARVER;JOHNSTON, 1989). However, these methods are not appropriate for examining the changes during and after RME therapy because they are based on a two-dimensional representation of a three-dimensional object (AKYALCIN et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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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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“…Using computational fluid dynamics, Iwasaki et al demonstrated significant reductions in nasal resistance and maximal negative pressure in the pharyngeal airway during inspiration [62]. These observed reductions are thought to contribute to the alleviation of paediatric OSAS.…”

Section: Rapid Maxillary Expansionmentioning

confidence: 99%

Dental Treatment for Paediatric Obstructive Sleep Apnea

Ngiam

Cistulli

2015

Paediatric Respiratory Reviews

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The effect of rapid maxillary expansion on pharyngeal airway pressure during inspiration evaluated using computational fluid dynamics

Cited by 52 publications

References 26 publications

Three-dimensional cone-beam computed tomography analysis of enlargement of the pharyngeal airway by the Herbst appliance

Three-dimensional cone-beam computed tomography analysis of enlargement of the pharyngeal airway by the Herbst appliance

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

Dental Treatment for Paediatric Obstructive Sleep Apnea

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