Acknowledgement
The authors express their gratitude to the researchers in the Department of Periodontology, Yonsei University College of Dentistry, Seoul, Korea for supporting the experiment, and Dr. Kwang-Seok Lee in the Department of Periodontology, Kyung Hee University Dental Hospital for assisting with histomorphometry. The statistical support of Prof. Jurg Husler, University of Zurich is highly acknowledged.
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