2012
DOI: 10.2319/083112-702.1
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Effectiveness of twin-block and Mandibular Protraction Appliance-IV in the improvement of pharyngeal airway passage dimensions in Class II malocclusion subjects with a retrognathic mandible

Abstract: Objective: To test the hypothesis that twin-block and Mandibular Protraction Appliance-IV (MPA-IV) are not effective in improving the pharyngeal airway passage (PAP) dimensions among Class II malocclusion subjects with a retrognathic mandible. Materials and Methods: Eighty-three subjects ranging in age from 8 to 14 years were divided into four groups. Group I included 30 Class I malocclusion subjects (healthy controls); group II consisted of 16 Class II malocclusion subjects (Class II controls); group III had … Show more

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Cited by 82 publications
(95 citation statements)
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“…In relation to these, the hypothesis was rejected. Our findings were in contrast with previous studies [6,12,20]. This might be attributed to the fact that the patients in our treatment group were at the beginning of pubertal growth at the beginning of activator treatment, therefore significant changes in the airway size related to the growth process were not expected.…”
Section: Discussioncontrasting
confidence: 84%
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“…In relation to these, the hypothesis was rejected. Our findings were in contrast with previous studies [6,12,20]. This might be attributed to the fact that the patients in our treatment group were at the beginning of pubertal growth at the beginning of activator treatment, therefore significant changes in the airway size related to the growth process were not expected.…”
Section: Discussioncontrasting
confidence: 84%
“…Therefore, the inferior positioning might depend on the balance between the suprahyoid and infrahyoid muscles. Current measurements showed that hyoid bone tended to move anteriorly, which was more noticeable in the treatment group and were probably due to the more anterior displacement of the mandible, in line with the findings of Jena et al [20]. As the genioglossus muscle is the main protruder of the tongue, it acts as an accessory respiratory muscle, resulting in advancement of the base of the tongue and dilation of the airway [29,30].…”
Section: Discussionsupporting
confidence: 70%
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