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NCT Number: NCT04529057

Evaluation of the Effect of Different Rapid Maxillary Expansion Appliances on Airway by Acoustic Rhinometry

Rapid maxillary expansion (RME) is an orthodontic treatment based on the principle of opening the midpalatal suture with the effect of orthopedic forces. The aim of this randomized clinical study was to evaluate and compare the effects of tooth-borne, tooth-tissue borne, and bone-borne rapid maxillary expanders on nasal airway by using AR. The null hypothesis was that there is no difference for the effect on nasal airway between the appliances.

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Key information

Conditions

Posterior Crossbite, Upper Airway

Age range

12 year–14 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

About this study

Introduction: The aim of this 3-arm parallel trial was to compare the effects of tooth-borne (Hyrax), tooth tissue-borne (KBME) and bone-borne (MIDME) rapid maxillary expansion (RME) appliances on nasal airway with acoustic rhinometry (AR).

Methods: Fourty-six 12- to 14-years-old patients with narrow maxilla were randomly allocated into 3 study groups according to the type of RME appliance: tooth-borne, tooth tissue-borne and bone-borne. Participants were recruited from the Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University, Turkey. During the RME treatment, the same protocol was applied to all patients and the expansion screws were activated twice a day (0.4 mm/day). Computer-generated randomization was used with group allocation concealed using opaque, sealed envelopes. The outcome assessor was blinded; however, it was not feasible to blind either operator or patients. The primary outcome of this study was the correction of posterior crossbite. Secondary outcomes included AR assessment of nasal airway dimensions as nasal volume, the minimal cross-sectional area (MCA) 1 and 2. AR measurements were obtained before treatment (T0), after active expansion (T1), and at 3 months-follow-up (T2). One-way analysis of variance (ANOVA) and a Bonferroni test was used for inter-group comparison and two-way ANOVA was used for intra-group evalaution.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • no previous tonsillar, nasal or adenoid surgery and orthodontic treatment,
  • Bilateral crossbite and need for RME,
  • maxillary and mandibular permanent teeth fully erupted,
  • willingness to participate in the study

Exclusion criteria

  • the presence of adenotonsillectomy due to tonsillar hypertrophy or adenoidal hypertrophy
  • having nasal/nasopharyngeal /oropharyngeal pathologies, craniofacial syndromes, systemic disease, poor oral hygiene,
  • history of previous orthodontic treatment.

Treatment and study plan

Rapid Maxillary Expansion Treatment

Procedure

The patients were treated with KBME, Hyrax and MIDME maxillary expansion appliances, respectively. All expansion appliances containing a Hyrax expansion screw positioned parallel to the second premolars and were used to correct the posterior crossbite. In the MIDME group, two mini-screws with a diameter of 1.6 mm and a length of 10 mm are located on the right and left sides between the roots of the 2nd premolar and 1st molar teeth with 60-70° angle. KBME and Hyrax expansion appliances were cemented with glass ionomer cement and MIDME was cemented with using the light-cured composite. Same protocol was applied to all patients during RME treatment. Expansion screws in all groups were activated by two turns a day.

Primary outcomes

  1. Correction of posterior crossbite

    Time frame: After active expansion (up to 3 weeks) (T1).

    The palatal cusps of the maxillary posterior teeth approximated the lingual cusps of the mandibular posterior teeth.

Secondary outcomes

  1. Increasing nasal cavity area-1

    Time frame: At baseline (T0), after active expansion (up to 3 weeks) (T1) and after 3 months retention period (T2)

    Increasing Minimum cross-sectional area1 (MCA1)

  2. Increasing nasal cavity area-2

    Time frame: At baseline (T0), after active expansion (up to 3 weeks) (T1) and after 3 months retention period (T2)

    Minimum cross-sectional area2 (MCA2)

  3. Increasing nasal cavity volume

    Time frame: At baseline (T0), after active expansion (up to 3 weeks) (T1) and after 3 months retention period (T2)

    Volume (Vol)

Sponsors and collaborators

Lead sponsor

Izmir Katip Celebi University

Other

Registry information

Official study title

Evaluation of the Effect of Different Rapid Maxillary Expansion Appliances on Airway by Acoustic Rhinometry: A Randomized Clinical Trial

Important dates

Study start
2016
Primary completion
2017
Study completion
2017
First posted
Aug 27, 2020
Registry last updated
Aug 27, 2020

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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