Table 1 Characteristics of the included studies
No. | Author (year) | Materials / Methods | Cement | Country | Investigation Period | Evaluation criteria | Follow-up period (y) | Age range (mean) | Study type | No of Patients | Dropout of restorations (%) | No of onlays / crowns | Failures of onlays / crowns | Defects of onlays / crowns | score |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Li et al. (2015) [27] | IPS Emax press / pressable PFM (gold) / casting | Adhesive | China | 2010.2-2010.11 | customized criteria | 3 | 21-88 (42) | PC | 94 | 0 | 46 / 80 | 1 / 2 | 2 / 5 | 8 |
2 | Barnes et al. (2010) [33] | Finess all-ceramic / pressable | Adhesive | NR | NR | Modified Rage criteria | 3 | NR | prospective study | NR | 31.60% | 19 / 9 | 1 / 0 | 1 / 0 | 6 |
3 | Jongsma et al. (2012) [34] | Neco / photopolymerized | Adhesive / Conventional | Nethelans | NR | customized criteria | 3 | 29-70 (53) | PC | 45 | 0 | 5 / 86 | 0 / 7 | 0 / 15 | 7 |
4 | Fabbri et al. (2014) [35] | IPS Emax press / pressable | Adhesive | Italy | 2006.6-2010.12 | Modified CDA criteria | 3 | 19-71 | retrospective study | NR | 0 | 62 / 197 | 1 / 7 | 1 / 8 | 7 |
5 | Li et al. (2019) [36] | IPS Emax cad / CAD/CAM | Adhesive | China | 2016.5-2016.12 | Modified USPHS | 1 | 67.5 | RCT | 66 | 5.30% | 38 / 40 | 0 / 0 | 3 / 5 | / |
6 | Fotiadou et al. (2021) [37] | IPS Emax press / pressable | Adhesive | German | 2010.1-2014.1 | FDI criteria | 6.6 | 26-84 (59) | RC | 145 | 0 | 179 / 5 | 7 / 1 | NR | 7 |