Dental Materials Journal has retracted three papers by different groups of authors for “violation of our publishing policies and procedures” — which turns out to be a polite way of saying “they wouldn’t pay our fees.”
The articles are:
Morinda citrifolia leaves enhance osteogenic differentiation and mineralization of human periodontal ligament cells.
Boonanantanasarn K, Janebodin K, Suppakpatana P, Arayapisit T, Rodsutthi JA, Chunhabundit P, Boonanuntanasarn S, Sripairojthikoon W.
Dent Mater J. 2014;33(1):149.
In vitro osteoinduction of human mesenchymal stem cells in biomimetic surface modified titanium alloy implants.
Santander S, Alcaine C, Lyahyai J, Pérez MA, Rodellar C, Doblaré M, Ochoa I.
Dent Mater J. 2014;33(1):148.
A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown.
Mahmoudi M, Saidi A, Gandjalikhan Nassab SA, Hashemipour MA.
Dent Mater J. 2014;33(1):147.
In each case, the retraction notices read:
This article has been retracted by the Editorial Board of Dental Materials Journal due to violation of our publishing policies and procedures as of December 1, 2013.
They had been retracted because of the unpayment of publication charge.