Cardoso, Antônio Carlos, and Walter Lindolfo Weingaertner. “Comparative Analyses of the Rotational Freedom of UCLA-Type Abutments before and After Casting With Cobalt-Chromium Alloy and After Application of Porcelain”. Brazilian Dental Science, vol. 13, no. 3/4, Sept. 2011, pp. 4-9, doi:10.14295/bds.2010.v13i3/4.719.