highly significantp < 0.001
After performing the systematic review and meta-analysis, it can be inferred that even when a high heterogeneity was attained (I 2 > 50%), all the random-effects models were highly significant ( p < 0.001) enough to arise differences between the groups and make it able to state that connective tissue graft is more effective than collagen matrices for soft tissues augmentation around both teeth and implants.