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dentistry dental last 4 cranial nerves last four cranial nerves crest module implant body external hex internal hex antirotation threads screw retained abutment pitch design implant polysulfide polyether addition silicone condensation silicone speejector retraction cord tissue management custom tray dental impressions computed topography ct scan claustrophobia gantry radiofrequency pulse tesla magnetic resonance imaging mri vinyl gloves nitryl gloves latex gloves latex allergy types of gloves mixed nerve motor nerve branches of spinal part of accessory nerve branches of glossopharyngeal nerve branches of vagus nerve branches of hypoglossal nerve cranial nerves illustration hypoglossal nerve spinal root of accessory nerve cranial root of accessory nerve vagus nerve