Cementing systems have improved remarkably, the objectives pursued by the new cements is that the adhesion must be durable and always achieve a closed interface with a perfect seal. It has been possible to develop new techniques and new cementation materials that have perfected the bonding of the restorative material to the tooth. In the present study, the adhesion strength to dentin of self-etching cements and total etching cements is compared to verify the positive effects on dentin etching. For the study, two resin-based cements (RelyX U200 Clicker 3M and RelyX Ultimate 3M) were used. 40 molars were encapsulated in acrylic in two groups of 20 samples for the application of two cementitious systems of self-etching (group 1) and total etching (group 2) respectively, they were worn until the dentin was discovered, following the manufacturer's specifications, the cement in each group, and then shear tested on an Instron universal testing machine. The measure expressed in megapascals (MPa) was: group 1 = 7.5569 and group 2 = 12.6444. In this case, two groups were analyzed, taking the first bilateral significance. The Student t-test is performed, with a 95% confidence interval in the difference, thus demonstrating that RelyX Ultimate 3M cement has greater bond strength than RelyX U200 Clicker 3M cement. Our research was feasible and we reached our purpose, which was to verify the greater adhesion of total etching cements, which are subjected to a previous treatment of the tooth.
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