Methods: 24 caries-free extracted permanent molars were used in this study. The teeth were divided into two groups according to restorative methods; experimental groups, indirect resin inlay (RI) and control groups, direct resin filling (RF). The experimental groups were immersed with provisional restoration for 1 week, and the teeth were divided into four subgroups according to polymerization mode and dentin adhesives. Group 1: Optibond FL with light polymerization, Group2: Optibond FL without light polymerization, Group 3: Onestep with light polymerization, Group 4: Onestep without light polymerization. All experimental teeth were restored with pre-fabricted 3 mm high-Tescera resin inlay and resin cement (Variolink). The control groups were divided into two subgroups according to dentin adhesives. The exposed dentin was treated with dentin adhesives immediately following manufacturer`s instruction and restored with direct resin filling (Estelite"). Group 5: Optibond FL, Group 6: Onestep The specimens were subjected to ìTBS. The specimens were subjected to ìTBS. The data were statistically analyzed using ANOVA and multiple comparisons are made using Turkey's test at p<0.05 level. Results: 1. The mean ìTBS of control groups(RF) were statistically different from experimental groups(RI), respectively. 2. In RI group, Optibond FL showed higher ìTBS value compared to Onestep. 3. In RI group, light polymerized group showed higher ìTBS than non-light polymerized group, unrelated with variables of dentin adhesives. Conclusion: In order to maximize the bond strength of a resin inlay to dentin, dentin adhesives should be light-polymerized before applying the cementing material. 3 step total etch adhesive is more recommendable than 2 step total etch adhesive for favorable bond strength.