Received: 23 August 2017
Accepted: 23 February 2018
First Online: 8 May 2018
Ethics approval and consent to participate
: The study design and consent forms for all procedures performed on the study subjects were approved by the ethics committee for human subjects at Japanese Society of Oral Implantology in accordance with the Helsinki Declaration of 1975 as revised in 2008.
: Not applicable
: Yuji Sato, Shigeto Koyama, Chikahiro Ohkubo, Shin Ogura, Ryutaro Kamijo, Satoru Sato, Jun Aida, Yuuichi Izumi, Mihoko Atsumi, Akio Isobe, Shunsuke Baba, Noriharu Ikumi, and Fumihiko Watanabe declare that they have no financial, commercial, academic, or any other competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.