## 3 Results
### Qualitative Synthesis
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Author and Year** & **Design** & **Population** & **Study and Intervention Groups** & **Description of the Findings** & **Follow-Up** \\ \hline [PERSON] et al., 2008 & Randomized & 40 patients & Study group: 20 implants with immediate loading & SurrR = 100\% & TBL = 1.02 mm & 24 months \\
[19] & Comparative study & Withdrawals: 0 & Control group: 20 implants with delayed loading & SurrR = 100\% & \\  & & 40 implants & Control group: 20 implants with delayed loading & TBL = 1.06 mm & \\ \hline [PERSON] et al., 2012 & Randomized controlled & 60 patients & Group A: 26 implants with immediate loading & SurrR = 96.6\% & \\  & 2012 & trial & Withdrawals: 5 & Group A: 26 implants with immediate loading & TBL = 45 mm \\  & & 55 implants & Group B: 29 implants with delayed loading & COMP = 2(mobility) & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\ \[PERSON] et al., & & 30 patients & Study group: 94 implants with immediate loading & Stock = 96.8\% & \\  & 2013 & Non-randomized & Withdrawals: 1 & Copy = 2(mobility 1: mucositis 1) & \\  & & & & & \\  & & 193 implants & Control group: 99 implants with delayed loading & Stock = 99.0\% & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & \\  & & & & & \\  & & & & \\  & & & & & \\  & & & & & \\  & & & & \\ \[PERSON] et al., & & 80 patients & IL: 134 implants with immediate loading & SurrR = 95.1\% & \\  & 2014 & Retrospective cohort & Withdrawals: 0 & COMP = 2(mocositis 6 peri-implantiantis 1) & SurrR = 97.8\% & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\ \[PERSON] et al., & & & & \\  & 2014 & Non-randomized & 40 patients & Study group: 20 implants with immediate loading & TBL = 0.18\% & \\  & & & & \\  & & & & Control group: 20 implants with delayed loading & Stock = 100\% & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\  & & & & \\ \hline [PERSON] et al., & & & & SurrR = 96.2\% & \\ \begin{table}
\begin{tabular}{p{42.7 pt} p{85.4 pt} p{85.4 pt} p{85.4 pt} p{85.4 pt} p{85.4 pt} p{85.4 pt}} \hline
**Author and Year** & **Design** & **Population** & **Study and Intervention Groups** & **Description of the Findings** & **Follow-Up** \\ \hline [PERSON] et al. & Retrospective cohort study & 82 patients & Group A: 25 implants with immediate loading & SurvR = 100.0\%; SaccR = 100.0\% & \multirow{2}{*}{24 months} \\  & 2017 & & 50 implants & Group B: 25 implants with delayed loading & SurvR = 100.0\%; SaccR = 100.0\% & \multirow{2}{*}{72 months} \\  & 198 & & & & \\ \hline [PERSON] et al., & & & & & & \\  & & & & & & \\  & & & & & & \\  & & & & & & \\  & & & & & & \\  & & & & & & \\  & & & & & & \\ \hline \end{tabular}
\end{table} 
Table 3: _Cont._On the other hand, the most frequent complication of post-extraction implant placement was peri-implant mucositis, which was most often observed in cases of immediate loading, followed by delayed loading [15; 19; 24] and early loading (with only one case) [24]. However, some studies fail to report such data [14; 19; 23; 26], others do not specify the type of complication [16; 21], and one study even reports no complications [17]. Likewise, according to the time of prosthetic loading and the duration of follow-up, the reported maximum implant survival rates were as follows: (a) immediate loading: 12 months 100% [14], 24 months 100% [18; 19], 48-60 months 100% [23], 120 months 95.6% [24]; (b) delayed loading: 12 months 100% [14], 24 months 100% [18; 19], 48-60 months 100% [23], 120 months 94.8% [16]; and (c) early loading of 120 months: 99.4% [25]. Only three of the studies assessed the implant success rate. In the case of immediate loading and delayed loading the success rate was 100% after 5 years [20], while delayed loading yielded better results than immediate loading after 12 months (99% and 96.2%, respectively) [22] and 24 months (100% and 96.8%) [20].