Table 2.
Summary of the included studies
| Author | Year | Follow up (years) | Type of attachment | Number of patient | Prosthodontic maintenance and complication | Retention | Peri-implant tissue condition | Patient’s satisfaction |
|---|---|---|---|---|---|---|---|---|
| Albuquerque et al.[15] | 2019 | 1 | Locator, ball | Locator-11, ball-12 | NR | Ball > locator | NR | NR |
| Burns et al.[16] | 2011 | 1 | 4IB, 2IB, ball | 4IB-10, 2IB-10 ball-10 | NR | 4IB > ball > 2IB | 4IB > 2IB > ball | Ball > 4IB > 2IB |
| Cepa et al.[17] | 2017 | 3 | Ball, telescopic | Ball-11, telescopic-5 | Ball > telescopic | NR | Ball=telescopic | Telescopic > ball |
| Cristache et al.[18] | 2014 | 5 | Ball, magnet, locator | Ball-23, locator-23 magnet-23 | Ball > locator > magnet | NR | NR | NR |
| Kleis et al.[19] | 2010 | 1 | Locator, ball (TG-O, dal-RO) | Locator-17 ball-26 | Locator > TG-O ring > dal-RO ring ball | Dal-RO ring > TG-O ring > locator | NR | NR |
| Krennmair et al.[20] | 2012 | 3 | Milled bar, telescopic crown | Bar-20 telescopic crown-19 | Telescopic > bar | NR | Bar=telescopic | NR |
NR: Not reported, 4IB: Four implant supported bar attachment, 2IB: Two implant supported bar attachment