Table 2 Failures of the identified studies

1

Li et al. (2015) [27]

IPS Emax press PFM (gold)

3

onlays:

crowns:

1 / 46

2 / 86

1

1

1

2

Barnes et al. (2010) [33]

Finess all-ceramic

3

onlays:

crowns:

1 / 13

0 / 7

1

3

Jongsma et al. (2012) [34]

Neco

3

onlays:

crowns:

0 / 5

7 / 86

1

1

4

1

4

Fabbri et al. (2014) [35]

IPS Emax press

3

onlays:

crowns:

1 / 62

7 / 197

1

4

1

2

5

Li et al. (2019) [36]

IPS Emax CAD

1

onlays:

crowns:

0 / 38

0 / 40

6

Fotiadou et al. (2021) [37]

IPS Emax press

6.6

onlays:

crowns:

7 / 179

1 / 5

4

1

1

2