## 3 Results  
A total of 898 articles were initially identified through searches in two databases. As shown in Figure 2, after removing duplicates, 699 articles remained for potential inclusion. Following a screening of titles and abstracts, 681 studies were excluded, leaving 18 studies for full-text review. Additionally, seven articles were identified through a manual search of external websites. Ultimately, 11 articles were included in this review, 5 of which were in vivo studies (case reports). Fourteen articles were excluded, thirteen for not utilizing direct additive manufacturing to produce temporary or permanent soft prostheses [19; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30] and one for describing the same protocol for color reproduction of human skin tones applied in the advanced manufacturing of soft tissue prostheses [31]. Tables 1 and 2 provide a summary of the findings from the included articles. Figure 2: The PRISMA flow diagram for studies selection [32]. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Author(s),** & **Type of** & **Additive** & **Materials** & **Comparison** & **Outcome** & **Clinical** & **Objections** & **Observations** \\
**Year** & **Study** & **Manufacturing** & **Technology** & **Used** & **Comparison** & **Assessed** & **Application** & **Overall** \\ \hline \hline \multirow{9}{*}{[PERSON] et al. (2024)[33]} & \multirow{9}{*}{In vitro} & \multirow{9}{*}{In vitro} & Silicone & & & & & Manually fabricated \\  & & & urethone & & & & & specimens \\  & & & (Carbon Sil30; & KTV silicones & & & (A103 and VST) \\  & & Vat & Xometry -CAR) & A-103 and & & & & showed higher \\  & & polymeriza- & and medical & VersillTaI-50F & & & & accuracy than \\  & & tiontechniques & grade pure & (VST) (Factor & precision & & & additively \\  & & & (TrueSil; & II, Inc) & & & & manufactured \\  & & & Spectroplast, & & & & & \\  & & & Inc-SPEC) & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Data extracted from the included articles on direct 3D-printed maxillofacial soft prosthesis. \begin{table}
\begin{tabular}{c c c c c c c c} \hline
**Author(s), Year** & **Type of Study** & **Additive Manufacturing Technique** & **Materials Used** & **Comparison** & **Outcome Assessed** & **Clinical Applications** & **Observations** \\ \hline Unkovskiy & In vivo (case & Dromp-on- & Skin-like-color & & & & \\ \(\,\  
For the clinical cases included, with full digital workflow, the methods used for data acquisition, design, and 3D-printed material properties are presented in Table 2.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Author(s), Year** & **Type of Study** & \begin{tabular}{c} **Additive** \\ **Manufacturing** \\ **Technique** \\ \end{tabular}  & \begin{tabular}{c} **Materials** \\ **Used** \\ \end{tabular}  & **Comparison** & \begin{tabular}{c} **Outcome** \\ **Assessed** \\ \end{tabular}  & **Cinical** **Applications** & **Observations** \\ \hline \hline \multirow{9}{*}{ \begin{tabular}{c} \begin{tabular}{c} \begin{tabular} \end{tabular} \\ \end{tabular} \\ \end{tabular}  } & & \begin{tabular}{c} Biocompatible \\ powder and \\ \end{tabular}  & & & & & \begin{tabular}{c} Pressure \\ significantly \\ enhanced both \\ the infiltration \\ rate and depth \\ of maxillofacial \\ silicones \\ \end{tabular}  \\  & & \begin{tabular}{c} Z-Corp Z510 \\ \end{tabular}  & \begin{tabular}{c} The medical \\ silicones were \\ compared \\ by infiltration \\ with three \\ different \\ medical-grade \\ silicones: \\ Sil-25, \\ Pro-Max-10, \\ and M-3428. \\ \end{tabular}  & \ \begin{tabular}{c} The internal \\ silicones were \\ compared \\ based on their \\ varying \\ inffiltration \\ quality was \\ equally via \\ SEM. \\ \end{tabular}