Fig. 7

A forest plot diagram showing cement mantle penetration in different zones on AP and lateral view. Five studies reported the cement mantle penetration in zone 1 on AP view. The results showed no significant difference in cement mantle penetration in zone 1 on AP view between the 2 groups (MD 0.15, 95% CI - 0.28 to 0.57, P = 0.5, I² = 96%). Three studies reported the cement mantle penetration in zone 2 on AP view. The results showed no significant difference in cement mantle penetration in zone 2 on AP view between the 2 groups (MD - 0.11, 95% CI - 0.47 to 0.25, P = 0.54, I² = 85%). Three studies reported the cement mantle penetration in zone 3 on AP view. The results showed significant difference in thickness of cement mantle penetration in zone 3 on AP view between the 2 groups (MD 0.23, 95% CI 0.12 to 0.34, P < 0.0001, I² = 0%). Five studies reported the cement mantle penetration in zone 4 on AP view. The results showed no significant difference in cement mantle penetration in zone 4 on AP view between the 2 groups (MD 0.29, 95% CI - 0.03 to 0.6, P = 0.07, I² = 90%). Five studies reported the cement mantle penetration in zone 1 on lateral view. The results showed no significant difference in cement mantle penetration in zone 1 on lateral view between the 2 groups (MD 0.18, 95% CI - 0.18 to 0.54, P = 0.32, I² = 93%). Five studies reported the cement mantle penetration in zone 2 on lateral view. The results showed no significant difference in cement mantle penetration in zone 2 on lateral view between the 2 groups (MD 0.18, 95% CI - 0.22 to 0.57, P = 0.38, I² = 94%)