PURPOSE: Analyze the possible alterations of mechanical properties of cobalt-chromium alloys measured through the Young’s module, when comaring new and/or recycled materials and casting techniques, in order to establish if those alloys can be resued to fabricate removable partial dentures. METHODS: For this experimental in vitro study, 60 specimens casted in Co-Cr alloys were assigned to two groups according to the type of alloy, Bego’s Wironit L.A® and Dentaurum’s Remanium® 800. The two groups were divided into 6 subgroups of 5 specimens each regarding state of the material and type of centrifuge used: new material with induction centrifuge, 50%-new-and-50%-recycled material with induction centrifuge, recycled material with induction centrifuge, new material with conventional centrifuge, 50%-new-and-50%-recycled material with conventional centrifuge, and recycled material with conventional centrifuge. FINDINGS: The state of the material is the factor that was more associated to the variation of the Young’s module, being the 50%-new-and-50%-recylced material that showed the highest variation. When comparing new and used materials, values were similar. Young’s module was less affected by the type of centrifuge used. There was not a significant association between the kind of Co-Cr alloy, Wironit® y Remanium®, and the variation in the Young’s module, in spite of presenting variations in composition (α=005).