This article has been retracted at the request of the Editor-in-Chief, because the authors plagiarized a previously published paper that had appeared in: Int J Oral Maxillofac Implants, 26 (2011) 101–107.
An important obligation when submitting a paper for publication is that the authors should explicitly declare the originality of their work.
This article presented the same table and figures as the original study, and changed 2 of the tables to figures. This article reflects severe abuse of the scientific publishing system, and has therefore been retracted. Journal of Periodontal & Implant Science takes this situation very seriously and apologizes to the authors of the original article and the readers of the journal.