A prospective CBCT study of upper airway changes after rapid maxillary expansion

Zeng, Jiang; Gao, Xuemei

doi:10.1016/j.ijporl.2013.07.028

Cited by 61 publications

(64 citation statements)

References 25 publications

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“…Previous studies, assessing the effects of RME on airway morphology and function, showed an increase of nasal size when maxilla was expanded [4–6, 26]. …”

Section: Discussionmentioning

confidence: 99%

“…The effects of RME on craniofacial structures have been extensively studied in the literature [1, 2] and are referred not only to anatomical structures close to the maxillary bone, but also to cranial base and temporomandibular joint [3]. Several authors suggested that RME affected the whole naso-maxillary complex, increasing nasal width and volume, also reducing the resistance of nasal airflow [4–6]. However, scientific evidence does not seem to recommend RME for the sole purpose of restoring the respiratory function [1].…”

Section: Introductionmentioning

confidence: 99%

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Digital evaluation of nasal changes induced by rapid maxillary expansion with different anchorage and appliance design

et al. 2017

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BackgroundScientific evidence showed that rapid maxillary expansion (RME) affects naso-maxillary complex, increasing nasal width and volume. This study aimed to evaluate nasal changes induced by rapid maxillary expansion with different anchorage and appliance design by using low dose and cone beam computed tomography.MethodsA total of 44 patients (20 males, mean age 8y 8 m ± 1y 2 m; 24 females mean age 8y 2 m ± 1y 4 m) were included in the investigation and divided into three groups according to the appliance: Hyrax-type expander anchored to permanent teeth, modified Hyrax-type expander anchored to deciduous teeth, modified Haas-type expander anchored to deciduous teeth. Maxillary expansion was performed until overcorrection and the expander was passively kept in situ for 7 months at least. All patients had three-dimensional imaging before expansion (T0) and after the retention period (T1). Nasal floor width, nasal wall width, maxillary inter-molar width were measured by means of Mimics software. The paired sample t-test was employed to assess the significance of the differences between the time points; the analysis of variance test (ANOVA) was used to compare differences between groups.ResultsThe statistical analysis revealed significant differences between T0 and T1 for each recorded measurement in each group; no significant differences were found by comparing groups.ConclusionsRapid maxillary expansion produces a significant skeletal transverse expansion of nasal region in growing patients. No significant differences in nasal effects are expected when the appliance is anchored onto deciduous teeth, with or without the palatal acrylic coverage.

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“…Previous studies, assessing the effects of RME on airway morphology and function, showed an increase of nasal size when maxilla was expanded [4–6, 26]. …”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Digital evaluation of nasal changes induced by rapid maxillary expansion with different anchorage and appliance design

et al. 2017

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“…While the effect of expansion was not accounted for in the present study, it may not have a significant influence. Several studies have used CBCT scans to evaluate airway changes following palatal expansion, finding no statistically significant effect on OA volume, [30][31][32][33][34] although significant effects have been demonstrated in the nasopharyngeal airway. 35 Lastly, CBCT scans were obtained in the current study with subjects in a seated position.…”

Section: Discussionmentioning

confidence: 99%

Changes in the oropharyngeal airway of Class II patients treated with the mandibular anterior repositioning appliance

Rizk¹,

Kulbersh

Al-Qawasmi

2015

The Angle Orthodontist

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Objective: To evaluate the effects of functional appliance treatment on the oropharyngeal airway volume, airway dimensions, and anteroposterior hyoid bone position of growing Class II patients. Materials and Methods: Twenty Class II white patients (mean age, 11.7 6 1.75 years) treated with the MARA followed by fixed appliances were matched to an untreated control sample by cervical vertebrae maturation stage at pretreatment (T1) and posttreatment (T2) time points. Cone beam computed tomography scans were taken at T1 and T2. Dolphin3D imaging software was used to determine oropharyngeal airway volume, dimensions, and anteroposterior hyoid bone position. Results: Multivariate ANOVA was used to evaluate changes between T1 and T2. Oropharyngeal airway volume, airway dimensions, and A-P position of the hyoid bone increased significantly with functional appliance treatment. SNA and ANB decreased significantly in the experimental group (P # .05). Changes in SNB and Sn-GoGn failed to reach statistical significance. Conclusions: Functional appliance therapy increases oropharyngeal airway volume, airway dimensions, and anteroposterior hyoid bone position in growing patients. (Angle Orthod. 2016;86:955-961.)

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“…(3)(4)(5)(6) Other in-vitro studies revealed the same results regarding nasal cavity widening specially the anterior and inferior parts. (7)(8)(9) Also the nasopharynx has expanded significantly as a result of inferio-anterior displacement of palatal shelves.…”

Section: Discussionmentioning

confidence: 74%

“…Last but not least, the average expansion amount was about not large enough to expand the pharyngeal airway according to the procedures of his study. (14) A recent study by Almuzian et al 2016 which investigated the effect of hyrax on upper and lower retropalatal spaces, revealed that The upper retropalatal space has reduced significantly which might be due to inferio-anterior displacement of palatal shelves secondary to RME, with subsequent stretch of palate-pharyngeus muscle leading to anterior displacement of the posterior pharyngeal wall, or due to trauma of the retropalatal tissue following midpalatine suture split. (10) Nevertheless, differences in compartmental segmentation were noticeable between the present method and the other-mentioned studies, especially those divided pharynx into upper and oropharyngeal airway, which might explain the different outcomes.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Two Different Palatal Expanders on Nasal and Pharyngeal Airway Volumes as Measured by CBCT

et al. 2017

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Objective: To evaluate and compare the effect of memory palatal split screw (Memorax) to that of conventional Hyrax rapid palatal expanders on nasal and pharyngeal airway volumes, which were measured and recorded by Cone beam computed tomography (CBCT). Materials and Methods: This study was conducted over 14 subjects of adolescent patients with bilaterally constricted maxillary arches, the sample contained 12 females and 2 males, with age ranged from 12ys to 15ys, with a mean of 13.6 ± 1.4. The sample was divided into two age matched groups, the Memorax group (N=7) subjects with a mean age of 13.5 ± 0.4, received the memory palatal split screw appliance (Memorax). The Hyrax group (N=7) subjects with a mean of 13.4 ± 1 were received the conventional Hyrax palatal expander. For all subjects taking part in the study, maxillofacial CBCTs and NOSE questionnaire records were taken before expansion (T 1 ) and after 3 months at the time of removal of the expanders (T 2 ). Data were explored for normality using Kolmogorov-Smirnov test of normality. Paired t test was used to compare mean values of before and after treatment. Independent (unpaired) test was used to compare between the two groups. Results: Memorax showed a significant increase in nasal airway volume as well as naso-, palato-and total pharyngeal airway volume. While Hyrax showed a non-significant decrease in the palatopharyngeal airway volume. Both groups showed a non-significant difference in the glossopharyngeal airway volume as well as in the NOSE questionnaire results. Conclusion: Memorax could be used in patients suffered from symptomatic nasal obstruction due to bilateral maxillary constriction, in order to improve their breathing as a primary purpose as well as treating malocclusion. It also may be advantageous because it shortens the maxillary expansion period, provides additional expansion in the retention period and generates light forces relative to the conventional Hyrax screw.

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A prospective CBCT study of upper airway changes after rapid maxillary expansion

Cited by 61 publications

References 25 publications

Digital evaluation of nasal changes induced by rapid maxillary expansion with different anchorage and appliance design

Digital evaluation of nasal changes induced by rapid maxillary expansion with different anchorage and appliance design

Changes in the oropharyngeal airway of Class II patients treated with the mandibular anterior repositioning appliance

The Effects of Two Different Palatal Expanders on Nasal and Pharyngeal Airway Volumes as Measured by CBCT

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