## 3 Results  
All tested crowns demonstrated a 100% survival rate following chewing simulation. Nonetheless, wear facets were observed at the occlusal contact points on all crowns, with no evidence of abutment fractures or screw loosening. A compressive strength test evaluates the capacity of a material to withstand deformation and ultimate failure under the application of opposing compressive forces. As the applied compressive load increases, the material initially undergoes deformation, followed by fracturing and eventual structural failure. Figure 3: Instron M1185 universal testing machine—a compressive strength test set up. Group A resulted as the most resistant to compressive strength (4411 MPa), followed by Group B--3314 MPa, Group C--3130 MPa, and Group D exhibits the lowest value--1864 MPa. Upon completion of the compressive strength tests, the tested specimens were subjected to repeated microscopic examination in accordance with the same criteria (Table 2). The microscopic analysis revealed that all test specimens exhibited a vertical trajectory of the fracture line and a compromised adhesive bond. No deformations were observed in the connecting screw or the superstructure (Figure 4). Mode of failure was defined due to [PERSON]'s classification as type V.  
Figure 5 demonstrates the average compression strength of each group, as well as the observed standard deviation of the compression strength of the observations within each group. Descriptive statistics results indicated that the compression strength of group A (4411 MPa) was the highest and more than twice higher than the performance of group D (1864 MPa). Groups B and C demonstrated a similar performance in terms of compression strengths with values of 3314 MPa and 3130 MPa, respectively; however, the individual measurements in group C demonstrated a high level of discrepancy, as expressed by the high level of standard deviation. In general, it can be concluded that group A outperformed the highest mechanical resistance in terms of compression strength, while maintaining a reasonably low level of variation in results. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & & & \multicolumn{3}{c}{**Observed Criteria**} \\ \hline \multirow{4}{*}{**Groups**} & \multirow{4}{*}{\begin{tabular}{c} **Deformation** \\ **of the** \\ **Connecting** \\ **Screw** \\ \end{tabular} } & \multirow{4}{*}{\begin{tabular}{c} **Deformation** \\ **of the** \\ **Abutment** \\ \end{tabular} } & \multirow{4}{*}{\begin{tabular}{c} **Presence of a** \\ **Fracture Line** \\ **or Crack in** \\ **the** \\ **Monolithic** \\ **Crown and the** \\ **Abutment** \\ \end{tabular} } & \multirow{4}{*}{\
\begin{tabular}{c} **Failure of the** \\ **Adhesive Bond** \\ **Between the** \\ **Crown or the** \\ **Titanium** \\ **Abutment** \\ \end{tabular} } & \multirow{4}{*}{
\begin{tabular}{c} **Destruction** \\ **of Either the** \\ **Monolithic** \\ **Crown or the** \\ **Titanium** \\ **Abutment** \\ \end{tabular} } \\ \hline A & 0 & 0 & 15 & 15 & 15 \\ \hline B & 0 & 0 & 15 & 15 & 15 \\ \hline C & 0 & 0 & 15 & 15 & 15 \\ \hline D & 0 & 0 & 15 & 15 & 15 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Results after compressive strength test. Figure 4: Vertical fracture model: (**a**) Group A; (**b**) Group D.  
The descriptive statistics findings showed that there are variations in the compression strength depending on the group under consideration. Thus, it is important to analyze whether the observed mean strength differences across the analyzed groups were statistically significant. For this purpose, the null hypothesis suggests that the compression strengths remain the same across all groups. An analysis of variance (ANOVA) test was applied to compare the mean values of the four groups and measure the existence of statistical significance. Results indicated that most differences are between groups, rather than within groups. The F statistic is 24.6--far above the confidence threshold of 2.77, as determined by the applied 0.05 confidence level.