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a- Flat Surface cavity model – removal of occlusal enamel; b- Cavity preparation and removal of all the walls, except the vestibular wall (control); c- Resin block fabrication; d- Cuts to obtain specimens for microtensile test; e- Class I cavity model – removal of occlusal enamel; f- Preparation of occlusal cavities; g- Restoration of cavities in a single increment; h- Cuts to obtain specimens for microtensile test; i- Specimens for microtensile test; j - Microtensile test
