effect of flowable composite and resin cement on shear bond strength of porcelain veneer to enamel

ABSTRACT

There are insufficient data on the shear bond strength of Porcelain Veneers to enamel by using flowable composite as a luting Cement. This study was conducted in order to compare the shear bond strength of two different systems by using bovine enamel. Thirty freshly extracted anterior mandibular intact bovine teeth were randomly divided into two groups. Feldespatic Porcelain discs were attached to the enamel by Panavia F2 resin Cement and Filtek Flow flowable composite according to the manufacture's instruction. The bonded specimens were immersed in 37°C water for 30 days and then thermocycled at 5°C and 55°C for 500 cycles. Samples were subjected to shear bond strength test. The modes of failure were determined under stereo microscope. Group differences were statistically analyzed by using the student-t test. The mean bonding strength in Panavia F2 group was 24.26 [ +/- 8.2] mega paschal [Mpa], and 17.25 [ +/- 8.1] Mpa, in Filtek Flow group. The statistical analysis showed significant difference between the two groups [P<0.005]. Mode of failure in the first group was mainly cohesive and adhesive in the second one. This study revealed that the shear bond strength of dual cure Panavia F2 resin cement is considerably higher than that of light cure Filtek Flow flowable composite