Text and Data Mining valid from 2018-11-07
Received: 19 September 2018
Accepted: 31 October 2018
First Online: 7 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The methods were carried out in accordance with the 1964 Declaration of Helsinki and the cadavers were legally donated for the research by the Nippon Dental University of Life Dentistry at Niigata in Japan.
: Informed consent was obtained from the families of all subjects.
: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.