Fig. 5. Sixteen measuring points for the marginal and internal gap of the crown. (A) Buccopalatal section, (B) Mesiodistal section. Marginal gap (MG): 1, 8, 9, 16; cervical gap (CG): 2, 7, 10, 15; axial gap (AG): 3, 6, 11, 14; occlusal gap (OG): 4, 5, 12, 13.