IADR Abstract Archives
Evaluation of changes in the nasal airway after conventional hyrax versus maxillary distalization with or without expansion Retrospective CBCT Study
Objectives: To evaluate the volumetric changes in the nasal airway after rapid maxillary expansion (RME) using conventional hyrax versus maxillary distalization with or without expansion using cone beam computed tomography (CBCT).
Methods: Sixty CBCT (30 pre-treatment T1 and 30 after 6 months T2) of adolescent patients were divided into three groups, depending on whether they had a constricted maxilla, reduced intermolar width. Group 1 was a traditional hyrax (E) with an average age of 13.27 years (Yrs.), group 2 was a distalization assisted by expansion (DE) with an average age of 13.38 Yrs., and group 3 was a distalization without expansion (D) with mean age 13.25 Yrs. CBCT records were taken before and after six months of RME and/or distalization, so a total sixty CBCT was analyzed. The Airway was segmented and quantified using Romexis software (version 5.3.4.39USA).
Results: The intragroup difference between T1 and T2 showed that all groups showed a significant increase in total airway, nasopharynx, retropalatal airway, and nasal cavity, but all groups showed a non-significant increase in SNA, or Position of maxilla, which was represented by ANV in groups 1&3, but not in group 2. In the case of the retroglossal airway, group 3 exhibited a non-significant increase, whereas groups 1 and 2 showed a significant increase.
Conclusions: Expansion and distalization have a role in increasing total air way volume. Distalization with expansion doesn’t occur as a pure backward skeletal movement hence, it does not decrease the volume of the airway.
Methods: Sixty CBCT (30 pre-treatment T1 and 30 after 6 months T2) of adolescent patients were divided into three groups, depending on whether they had a constricted maxilla, reduced intermolar width. Group 1 was a traditional hyrax (E) with an average age of 13.27 years (Yrs.), group 2 was a distalization assisted by expansion (DE) with an average age of 13.38 Yrs., and group 3 was a distalization without expansion (D) with mean age 13.25 Yrs. CBCT records were taken before and after six months of RME and/or distalization, so a total sixty CBCT was analyzed. The Airway was segmented and quantified using Romexis software (version 5.3.4.39USA).
Results: The intragroup difference between T1 and T2 showed that all groups showed a significant increase in total airway, nasopharynx, retropalatal airway, and nasal cavity, but all groups showed a non-significant increase in SNA, or Position of maxilla, which was represented by ANV in groups 1&3, but not in group 2. In the case of the retroglossal airway, group 3 exhibited a non-significant increase, whereas groups 1 and 2 showed a significant increase.
Conclusions: Expansion and distalization have a role in increasing total air way volume. Distalization with expansion doesn’t occur as a pure backward skeletal movement hence, it does not decrease the volume of the airway.
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