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The experimental groups. FC: composite resin core with prefabricated fiber post, ZC: composite resin core with a prefabricated zirconia tube, ZFC: composite resin core with a prefabricated zirconia tube and prefabricated fiber post. (a) Composite resin, (b) Prefabricated glass-fiber post, (c) Prefabricated zirconia tube, (d) and Monolithic zirconia crown.
