Fig. 3From: Micro computed tomography (Micro-CT) characterization of root and root canal morphology of mandibular first premolars: a systematic review and meta-analysisAÂ Low risk of bias: studies that met at least four of the criteria; BÂ Moderate risk of bias: studies that met between two and four of the criteria and CÂ High risk of bias: studies that met less than two criteria. (Green-Yes; Red-No; Yellow-Unclear)Back to article page