Table 1 Marginal extension and marginal adaptation levels of the crowns

Marginal extension of crown (n = 40)

A: Subgingival

16 (80)

10 (50)

B: Gingival level

3 (15)

5 (25)

C: Supragingival

1 (5)

5 (25)

Clinical marginal adaptation (n = 40)

A: No discrepancies detected with explorer

20 (100)

19 (95)

B: Detectable discrepancies but clinically acceptable

0 (0)

1(5)

C: Detectable discrepancies, replacement required

0 (0)

0 (0)

Radiographic marginal adaptation (n = 48) ^a

A: Continuous with the contour of the crown; nice adaptation

20 (83)

23 (96)

B: Slight overhang or under-contour of the crown (< 1 mm ledging)

present

4 (17)

1 (4)

C: Crown ledging ≥ 1 mm noted

0 (0)

0 (0)