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Al-kalaly A. A., Dyson J. E., Wong R. W. K., Schatzle M., Cheung L. K, Rabie A. B. M. Effect of different advancement positions on the maximum retrusive force of the mandible Orthod Craniofac Res 2013; 16:56–64. © 2012 John Wiley & Sons A/S Structured Abstract Introduction – Functional appliances lead, in different degrees, to loss of anchorage in the lower arch. By anchoring them to the mandibular bone, any dental side effects may be avoided and the skeletal effect enhanced. Stability of bone-borne fixation would be affected by forces created by the pull of the masticatory muscles. We aimed to identify mean maximum forces produced by mandibular retrusive muscles, at different degrees of advancement. Subjects and methods – Eighteen healthy adult volunteers participated in the study. Maximum retrusive force was measured using a splint/load cell system. Readings of the maximum forces of retrusion were taken from five mandibular positions: unstrained retruded position, and 4, 5, 6, and 7 mm anterior to the unstrained position. Data were presented as means ± SD and anova was performed to examine statistical significant differences between means of the maximum retrusion force. Results – Mean maximum retrusion force ranged between 63.3 and 198.2 newtons at the unstrained and 7 mm positions, respectively. It increased as the distance of advancement increased, being statistically significantly (p |
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