http://reply.papertrans.cn/1/73/7269/7269-31.png
http://reply.papertrans.cn/1/73/7269/7269-32.png
Submitted on: 15 September 2008.
Revised on: 27 October 2008.
Accepted on: 23 December 2008.
___________________Dentistry Journal---MDPI
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http://reply.papertrans.cn/1/73/7269/7269-35.png
Submitted on: 16 August 2008.
Revised on: 02 December 2008.
Accepted on: 22 December 2008.
___________________Dentistry Journal---MDPI