Telementoring Demonstration in Craniofacial Surgery with HoloLens, Skype, and Three-Layer Facial Models

Background: Telementoring is the technology for providing surgical instruction from a remote place via a network. To demonstrate the use of telementoring in craniofacial surgery, Skype and a mixed reality device HoloLens were adopted, and 3-layer facial models had been developed. Methods: A resident in hospital A used the model surgery under remote guidance by a mentor surgeon in hospital B 4 times on different dates. The straight-line between hospitals A and B is 250 km. The mentor gave the resident guidance via Skype and HoloLens, communicating by voice, and video of the surgical field, and providing reference data. Results: There was no delay in voice communication and a delay of

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