%0 Journal Article %T Investigating the effect of photoinitiator ratio on the polymerization shrinkage in dental composites by two comparative methods %A TEKEREK, B.S. %A YÜCEL, S. %A AYDIN, Ä. %A ÜNAL, A. %J Sigma Journal of Engineering and Natural Sciences %D 2015 %V 33 %P 33-40 %R