Objectives: The objective of this study is to determine the setting time of four temporary resins by use of Fourier Transform Infrared spectroscopy. Methods: Two methacrylate (Snap (A) and Jet(B)) and two dimethacrylate (Insta Temp (C) and Cool Temp (D))based resins used in prosthodontics were compared. Three specimens of each material were evaluated using FTIR spectroscopy. The spectroscopic evaluations were conducted by use of microscopy based attenuated total reflection. Immediately after the materials had been mixed, material specimens were placed under the FTIR microscope and an ATR crystal was indented into the unset material. FTIR spectra were collected after 1, 5, 10, 15, 20, 30, 40, 50 and 60 min. The carbonyl and aliphatic peaks were identified and their heights measured. The aliphatic/CO peak ratios were calculated and plotted as functions of cure time. These plots were then analyzed to determine at which times these ratios stabilized, and these times were referred to as being the setting times of the different specimens. These setting times were then compared statistically by use of ANOVA and t-test. Results: The setting times of the different products were: A = 13.74 ± 5.07 min, B = 27.7 ± 1.48 min, C = 5.48 ± 2.38 min and D = 12.51 ± 3.40 min. Jet had the longest setting time (p<0.05) while Insta Temp had the shortest (p<0.05) of all the products. As groups, the dimethacrylate materials (C and D) had the shortest setting times. Conclusions: Long setting time of temporary resins should be avoided to decrease the risk for distortion during adjustments. From that point of view, a dimethacrylate such as material C is recommended, while a material such as B should be avoided.

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