The aim of this study is to evaluate the effect of the Boyle-Davis mouth opener, which is routinely used in cleft palate surgery, on intracranial pressure by USG-guided optic nerve sheath diameter measurement, which is a non-invasive method with proven effectiveness and reliability in recent years.
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change in optic nerve sheath diameter
Timeframe: After general anesthesia induction, after endotracheal intubation, after mouth gag insertion (primary timepoint), 20 minutes, 40 minutes, 60 minutes after mouth gag insertion