## 3 Results
* **Data regarding the design and impression technique of the fixed restoration with implant support**  
When we analyze the retaining system used for fixed restorations on implants, the majority of the prosthodonic specialists prefer screw-retained restorations (80.5%). In the dental laboratory in 67.3% of cases the screw-retained restoration is the most frequently requested system for fixed prosthetic restoration on implant support. 61.8% of the dentists use the titanium abutment, followed by the custom abutment. Two respondents have chosen the \"other\" option, indicating the straight and the angled abutment and also the calcinable one. Regarding the most requested type of abutment in the lab, the leader is the titanium abutment (83.6%), while the customized abutment is requested only in 16.4% of the cases (Table 3). For implant-supported fixed restorations like crowns and bridges, the most elected type of impression is the open tray technique with connected transfer copings, 40% of the clinicians use intraoral scanning and only 1.8% use plastic transfer copings. In the doctors' \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Question** & **Response Options** & \multicolumn{2}{c}{**Prosthodontic Specialists**} & \multicolumn{2}{c}{**Dental Technicians**} \\ \hline  & & **Count** & **Percentage** & **Count** & **Percentage** \\ \hline What type of fixed restaurant on implants most often? & Screw-retained restorations & 44.27 & 80.5 & 37.05 & 67.3 \\ \hline  & Cement-retained restorations & 10.72 & 19.5 & 17.98 & 32.7 \\ \hline  & Titanium & 34 & 61.8 & 45.98 & 83.6 \\ \hline What type of implant abutment do you use most often in the implant fixed restorations? & Zirconia & - & 5 & 9.1 \\ \hline  & Custom abutment & 17.98 & 32.7 & 9 & 16.4 \\ \hline  & Straight/angled/calcinable abutment & 3 & 5.5 & - & - \\ \hline  & Open tray with connected transfer copings & 34.98 & 63.6 & 34.65 & 63 \\ \hline What type of impression do you send to the lab/receive in the lab for implant supported crown and bridge? & Open tray without connected transfer copings & 14 & 25.5 & 12 & 21.8 \\ \hline  & Closed tray & 7.97 & 14.5 & 5 & 9.1 \\ \hline  & Intraoral scanning & 22 & 40 & 11 & 20 \\ \hline  & Plastic copings & 1 & 1.8 & - & - \\ \hline  & Open tray with connected transfer copings & 34 & 61.8 & 34.98 & 63.6 \\ \hline What type of impression do you send to the lab/receive in the lab for implant supported full-arch fixed prosthesis? & Open tray without connected transfer copings & 6.98 & 12.7 & 14 & 25.5 \\ \hline \hline  & Closed tray & 7.97 & 14.5 & 4 & 7.3 \\ \hline  & Intraoral scanning & 12.98 & 23.6 & 7.97 & 14.5 \\ \hline  & Plastic copings & 1 & 1.8 & 1 & 1.8 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Data regarding design and impression technique of the fixed restoration with implant support. study lot 67.6% use the open tray technique with connected transfer copings for the full arch fixed implant-supported restorations  
Over 50% of the implant supported fixed restoration cases that arrive in the dental laboratory have used the open tray with connected transfer copings impression technique. The Likelihood Ratio test for full arch fixed implant impression indicates a significant difference between the ratios that correlate the clinical experience and the open tray impression technique without connecting the transfer copings; 100% of the clinicians with over 10 years of experience have chosen this option. (Test Likehood Ratio, \(p\) value = 0.030179, Test: Linear-by-Linear Association, \(p\) value = 0.396511). * **Type of material and fixed implant prosthesis design** In the anterior region, the most frequently used material differs in the two study groups, according to the answers. The clinicians have chosen the all-ceramic zirconia crown as the leading restoration for the anterior, followed by the porcelain fused to metal crown, while the technicians have a reversed ratio. The results were similar to the ones from the Al Dosari study [14].