Objectives: The purpose of this study was to evaluate the microtensile bond strength between the translucent quartz fiber post and a resin cement. Methods: 20 fiber posts (Light Post, Bisco) were used and divided into 2 groups according to the post surface treatment (n = 10): Group 1 – treated with phosphoric acid 37% (1 min); Group 2 (Cojet System) – sandblasting with silica particles 30µm (CoJet-Sand) + ESPE-SIL. Then, the adhesive system All Bond 2 (Primer A + Primer B) was applied and the posts were cemented in a cylinder (length – 5mm, height – 15mm) with Duolink (Bisco), following the manufacturer's instructions. Afterwards, its were stored in distilled water (37ºC /24h). The samples were sectioned in 2 axes, x and y, with a diamond disk under refrigeration (Labcut 1010), obtaining non-trimming samples (35 per group) with ±0.8 mm² of adhesive area. Then, each sample were attached with cyanoacrylate to adapted device for the microtensile, which was performed in universal testing machine (0,5mm/min). The tensile strength data were submitted to Mann-Whitney analyze. Results: The mean value [MPa] of the Group 2 (15,14b) was greater than the mean value of the group 1 (7,16a). All of the failure modes were adhesive (post – cement). Conclusions: The posts treated with the CoJet System showed higher microtensile strength to resin cement than the posts treated with phosphoric acid.

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