Nanofill compositeresinhasmechanical strengthaswell ashybridcompositeandaestheticvalueas well as mikrofil. Attachment betweenresincompositewiththetoothsurface occurs through the bonding material. There were two methods of application of thebonding material, which is total-etch and self-etch. Evaluation of the two materials is doneby knowing the difference between the tensile strength of self-etch and total-etch in the Class cavity.!" permanent ma#illary premolar teeth were prepared class , the root of the tooth iscut to the lower limit of the cervical and then planted in a mold containing acrylic resin. Thesamples were divided into two groups.The first group was applied to the resin compositenanofill withtotal-etchadhesive, thesecondgroupwas appliedtotheresincompositenanofill with self-etch adhesive. $amples were stored in artificial saliva for "% hours andincubated at a temperature of !&'C. The speciments were thermocycled in ()'C and %'C for *minute each temperature, repeated for "+ times. The tensile strength were test using,niversal Testing -achine. The results was evaluated statistically using .ndependent t-testwith significancy level /+0.The results showed that the two groups of the study there are differences in the value oftensile strength significantly, p1).)))234).)+5, so it can be concluded that there aredifferences in the tensile strength of the composite resin nanofill using a total-etch adhesivesystems and self-etch adhesive system. Nanofill tensile strength of composite resin using atotal-etchadhesivegiveresults greater thanthetensilestrengthof thecompositeresinnanofill with self-etch adhesive.