Changes in respiratory and cardiac functions of mandibular deficient patients after treatment with a removable functional appliance

Document Type : Original Article(s)


1 Assistant Professor, Department of Orthodontics, School of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

2 Assistant Professor, Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

3 Instructor, Department of Electrical Engineering, School of Engineering, Shohadaye Hoveizeh University of Technology, Susangerd, Iran

4 Dentist, Private Practice, Tehran, Iran



Background: There is no study on respiratory or cardiac function of mandibular deficient patients before or after treatment. This preliminary trial was conducted for the first time to assess respiratory/cardiac parameters of such patients before and after treatment (compared to healthy controls) with a removable functional appliance.
Materials and Methods: This before-after clinical trial was performed on 20 patients with Class II division 1 malocclusion (mandibular deficiency with normal maxilla) and 20 matched control subjects at the peak of the mandibular growth spurt. Bionator removable functional appliance was used for 9 months to treat Class II cases. Capnography and pulse oximetry were used to record respiratory parameters (end-tidal carbon dioxide (PETCO2)), respiration rate (RR), oxygen saturation (SPO2), and pulse rate (PR)). Groups were compared using paired and unpaired t tests (α=0.05).
Results: CO2 and O2 did not change significantly after treatment (P>0.5, paired t-test). However, respiratory rate and pulse rate reduced significantly after the treatment (P0.1). O2 in healthy subjects was not different from pre-treatment or post-treatment values in Cl II patients (P>0.2, independent-samples t-test). The respiratory rate in healthy controls differed from pre-treatment (P


Main Subjects

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