2.4- OPERATOR / EXAMINERS CALIBRATION Operator will do one restoration of each group in order to identify all steps involved in the application technique. This procedure will be done three times, with one week, interval. All restorations done by the same calibrated operator. Three experienced and calibrated dentists, not involved with the restoring procedures and therefore blinded to the group assignment, will perform the clinical evaluation. For training purposes, the examiners observed 10 photographs that were representative of each score for each criterion, in 10 cervical restorations (not included in this trial), each one, on two consecutive days. An intra-examiner and inter-examiner agreement will be calculated.