Acknowledgement
The authors wish to express their gratitude to Dr. Hiroshi Iwata and Dr. Kazuto Koresawa of the Nippon Dental University Hospital, as well as Dr. Madoka Nagaura of the Nippon Dental University School of Life Dentistry at Tokyo, for their invaluable assistance with the image acquisition and observation. The authors would also like to thank Dr. Keiichi Nishikawa of Tokyo Dental College for his considerable aid with the preparation of this study.
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