The effects of salivas on occlusal forces SUMMARY Contacting surfaces of opposing teeth produce friction that, when altered, changes the contact force direction and/or magnitude. Since friction can be influenced by several factors, including lubrication and the contacting materials, the aim of this study is to measure the occlusal load alterations experienced by teeth with the introduction of different salivas and dental restorative materials. Pairs of molar teeth were set into occlusion with a weighted maxillary tooth mounted onto a vertical sliding assembly and the mandibular tooth supported by a load cell. The load components on the mandibular tooth were measured with three opposing pairs of dental restorative materials (plastic denture, all-ceramic and stainless steel), four (human and 3 artificial) salivas, and 16 occlusal configurations. All lateral force component measurements were significantly different (P<0.0001) from the dry (control) surface regardless of the crown material or occlusal configuration, while the effects of the artificial salivas compared to each other and to human saliva depended on the crown material.