Journal Article

Cranial base considerations between apnoeics and non‐apnoeic snorers, and associated effects of long‐term mandibular advancement on condylar and natural head position

Christopher Robertson

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 24, issue 4, pages 353-361
Published in print August 2002 | ISSN: 0141-5387
Published online August 2002 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/24.4.353
Cranial base considerations between apnoeics and non‐apnoeic snorers, and associated effects of long‐term mandibular advancement on condylar and natural head position

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One hundred consecutively medically referred patients (58 apnoeic and 42 asymptomatic snorers) were reviewed cephalometrically at six‐monthly intervals (6–30 months) following treatment for obstructive sleep apnoea (OSA) and/or habitual snoring by mandibular advancement. Eighty‐seven males and 13 females (mean age 49 years, SD 8.5, range 33–74) were included in this study. Reference points and planes in the cranial base, nasopharynx, and mandibular condyle were digitized with a Reflex Metrograph and their means converted to linear and angular measurements.

No statistically significant differences were observed between the apnoeic and non‐apnoeic groups in either their skeletal or cranial base measurements. All linear cranial base dimensions were, however, reduced in the apnoeic group, with the exception of the distance (S–SE). Following mandibular advancement, statistically significant changes were observed in vertical condylar position (Cd–vert) with changes occurring at 6 (P < 0.012), 18 (P < 0.043), and 24 months (P < 0.007). No changes in horizontal condylar position (Cd–horiz) were found. Significant changes were observed in natural head position (NHP) with a reduction from an extended (NSL–vert 99.7 degrees) to a more upright NHP (NSL–vert 93.0, P < 0.001).

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Subjects: Restorative Dentistry and Orthodontics

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