Skip to main content

Table 7 Tooth wear evaluation

From: Comparing zirconia to anterior strip crowns in primary anterior teeth in children: a randomized clinical trial

Chi-square test

 

Zirconia crowns

Strip crowns

p-value

Tooth wear of opposing

    

At 3 months

No loss of enamel surface characteristics, no loss of contour

60 (100.0%)

60 (100.0%)

N/Ac

At 6 months

No loss of enamel surface characteristics, no loss of contour

60 (100.0%)

60 (100.0%)

N/Ac

At 12 months

No loss of enamel surface characteristics, no loss of contour

53 (88.3%)

60 (100.0%)

0.020a

 

Loss of enamel surface characteristics, minimal loss of contour

7 (11.7%)

0 (0.0%)

 

Friedman test

Mean rank

Total cases

Zirconia crown

Strip crown

Baseline

2.47

2.44

2.50

At 3 months

2.47

2.44

2.50

At 6 months

2.47

2.44

2.50

At 12 moths

2.59

2.68

2.50

p-value

 < 0.001b

 < 0.001b

N/Ac

  1. aSignificant using Chi-Square Test @ < 0.05 level
  2. bSignificant using Friedman Test @ < 0.05 level
  3. cNo statistics are computed because variable is a constant