Fracture Resistance of Endodontically Treated Teeth ...
Inc, USA). Specimens were mounted in a universal testing machine (Model 3345; Instron Industrial Products, Norwood, MA, USA). Each specimen was loaded to failure at a crosshead speed of 5.0 mm / min. Mode of failure ... maxillary premolars teeth when compressive force was applied [7,8]. ... and placed in root canal till to the working length ...
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