Table 5 Association of functional properties at different months within the groups

AT 1 MONTH

No.

%

No.

%

No.

%

No.

%

 Restoration retained, no fractures/cracks

14

100

14

100

14

100

42

100

-

 Harmonious outline, no gaps, no discolouration

14

100

14

100

14

100

42

100

-

 Physiological wear equivalent to enamel (80-120% of corresponding enamel)

9

64.3

7

50

11

78.6

27

64.3

χ2=2.489 p=0.288

 Normal wear with only a slight difference to enamel (50-80% or 120-150% of corresponding enamel)

5

35.7

7

50

3

21.4

15

35.7

 Normal contact point (floss or 25 metal blades can be inserted but not 50 blades)

14

100

14

100

12

85.7

40

95.2

χ2=4.200 p=0.122

 It is slightly too strong but no disadvantage

0

0

0

0

2

14.3

2

4.8

 Radiographic examination. No pathology, the harmonious transition between restoration and tooth

14

100

14

100

14

100

42

100

-

 Entirely satisfied

4

28.6

5

35.7

5

35.7

14

33.3

χ2=0.214 p=0.898

 Satisfied

10

71.4

9

64.3

9

64.3

28

66.7

 Restoration retained, no fractures/cracks

14

100

14

100

14

100

42

100

-

 Harmonious outline, no gaps, no discolouration

14

100

14

100

14

100

42

100

-

 Physiological wear equivalent to enamel (80-120% of corresponding enamel)

0

0

0

0

4

28.6

4

9.5

χ2=8.842 p=0.012

 Normal wear with only a slight difference to enamel (50-80% or 120-150% of corresponding enamel)

14

100

14

100

10

71.4

38

90.5

 Normal contact point (floss or 25 metal blades can be inserted but not 50 blades)

14

100

14

100

12

85.7

40

95.2

χ2=4.200 p=0.122

 It is slightly too strong but no disadvantage

0

0

0

0

2

14.3

2

4.8

 No pathology, the harmonious transition between restoration and tooth

-

 Satisfied

-

 Restoration retained, no fractures/cracks

14

100

14

100

14

100

42

100

-

 Harmonious outline, no gaps, no discolouration

14

100

14

100

14

100

42

100

-

 Normal wear with only a slight difference to enamel (50-80% or 120-150% of corresponding enamel)

11

78.6

11

78.6

12

85.7

34

81

χ2=0.309 p=0.857

 Differing wear rate to enamel but within the biological variation

3

21.4

3

21.4

2

14.3

8

19

 Normal contact point (floss or 25 metal blades can be inserted but not 50 blades)

14

100

14

100

12

85.7

40

95.2

χ2=4.200 p=0.122

 It is slightly too strong but no disadvantage

0

0

0

0

2

14.3

2

4.8

 No pathology, the harmonious transition between restoration and tooth

14

100

14

100

14

100

42

100

-

 Satisfied

14

100

14

100

14

100

42

100

-

Total

14

100

14

100

14

100

42

100