Table 6 Restoration failure evaluation

Restoration failure

At 3 months

Crowns appear normal, no cracks, chips, or fractures

60 (100.0%)

60 (100.0%)

N/A^c

At 6 months

Crowns appears normal, no cracks, chips, or fractures

59 (98.3%)

52 (86.7%)

0.024^a

Small but noticeable area of loss of material

0 (0.0%)

7 (11.7%)

Large loss of crown

0 (0.0%)

1 (1.7%)

Complete loss of crown

1(1.7%)

0 (0.0%)

At 12 months

Crowns appears normal no cracks, chips, or fractures

58 (98.3%)

37 (61.7%)

 < 0.001^a

Small but noticeable area of loss of material

0 (0.0%)

18 (30.0%)

Large loss of crown

0 (0.0%)

5 (8.3%)

Complete loss of crown

1 (1.7%)

0 (0.0%)

Baseline

2.37

2.49

2.24

At 3 months

2.37

2.49

2.24

At 6 months

2.5

2.49

2.51

At 12 moths

2.77

2.53

3.01

p-value

 < 0.001^b

0.392

 < 0.001^b