Introduction: The aim of this in vitro study is to evaluate and compare the root-end cavities for the presence of microcracks after cavity preparation using two different ultrasonic (US) retrotips and conventional bur. Materials and Method: Thirty single-rooted teeth were instrumented and obturated. Three millimeters of apices were resected. https://www.spidertattooz.com/USC-Trojans-9FIFTY-Snapback-Hat/