PRIMARY RESISTANCE FORMDefinition – Prevention of tooth or restoration fracture from occlusal forces.1) Cavosurface angle ー butt joint ー 90 degree - Must be supported by sound dentine - must be located in an area free of occlusal stress2) Flat Pulpal Floor3) Internsl line angles ー rounded offCLASS II- Gingival beveling ーuse GMTー to give roll resistance- Unsupported enamel rods(directed towards gingiva) are cut- Gives strong fillingPRIMARY TOOTH- enamel rods are occlusally directed- ∴ no need gingival bevel for class II in primary

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