Myriam Hamieh, Laura R Iwasaki, Elizabeth Palmer, Dongseok Choi, Jeffrey C Nickel, Hongzeng Liu
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引用次数: 0
Abstract
Objective: Mandibular growth is influenced by function. This study tested for correlation amongst nocturnal autonomic nervous system (ANS) and jaw muscle activities and mandibular ramus height.
Materials and methods: According to Institutional Review Board oversight, children with skeletal Class II malocclusions were enrolled in this observational study. Subjects had cone-beam computed tomography images, participated in protocols to quantify jaw muscle activity per bite-force, and were trained to use portable recorders to collect jaw muscle and heart rate variability (HRV) data over four nights at home. Night-time ultradian cycling of ANS activity was characterised by fitting a polynomial to the HRV measures of sympathovagal tone (low/high frequency spectral powers, LF/HF). Twenty-minute windows around each inflection point of this polynomial were identified, within which HRV measures and jaw muscle activities (Duty Factor, DF) were quantified. DF versus HRV measures (DF/HRV) were plotted for each subject, and regression slopes calculated. Non-linear regression analysis was used to test for correlation between DF/HRV slopes, age (years), and ramus height (mm).
Results: Thirteen (eight males, five females) of 15 children enrolled completed protocols. DF versus LF/HF had average R2 values of 0.66 ± 0.22 for masseter muscles (left and right), and 0.57 ± 0.19 and 0.55 ± 0.17 for left and right temporalis muscles, respectively. Regression analysis demonstrated that approximately 42% of the variance in mandibular ramus height could be explained by the combined effects of age and masseter muscle DF versus LF/HF.
Conclusions: Mandibular ramus height may reflect the influence of sympathovagal tone on nocturnal jaw muscle activity in children.
期刊介绍：
Orthodontics & Craniofacial Research - Genes, Growth and Development is published to serve its readers as an international forum for the presentation and critical discussion of issues pertinent to the advancement of the specialty of orthodontics and the evidence-based knowledge of craniofacial growth and development. This forum is based on scientifically supported information, but also includes minority and conflicting opinions.
The objective of the journal is to facilitate effective communication between the research community and practicing clinicians. Original papers of high scientific quality that report the findings of clinical trials, clinical epidemiology, and novel therapeutic or diagnostic approaches are appropriate submissions. Similarly, we welcome papers in genetics, developmental biology, syndromology, surgery, speech and hearing, and other biomedical disciplines related to clinical orthodontics and normal and abnormal craniofacial growth and development. In addition to original and basic research, the journal publishes concise reviews, case reports of substantial value, invited essays, letters, and announcements.
The journal is published quarterly. The review of submitted papers will be coordinated by the editor and members of the editorial board. It is policy to review manuscripts within 3 to 4 weeks of receipt and to publish within 3 to 6 months of acceptance.
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