## 4 Results and Discussion  
The finite element model breast prosthesis was subjected to the proposed load cases. The first case \"a\", involves the condition of a standing person, where only the gravity is affected. Figure shows the displacements and stress generated by this condition. The case for a standing person is one of the most important because it is one of the predominant positions in daily life. Figure 10 shows displacements in the range of 0 to 26 mm, with the greatest magnitude of displacement found in the ripple. Likewise, the distribution of displacements in the prosthesis is symmetrical and with good trajectory; it does not present punctual stress (stress concentration) and its maximum stress is approximately 7 Kpa. The prosthesis does not present defects in its form or contour or on its surface for this load case. The results are consistent with that of the profile of deformation and magnitude of displacement reported by [50; 51], similar to the deformation of a real breast under the effects of gravity. Cases \"b\" and \"c\" represent the positions  
Figure 9: Different load cases proposed to evaluate the finite element model: (**a**) standing person, (**b**) position prone (on all fours), (**c**) lying supine, (**d**) horizontal force applied to the ripple region, (**e**) combines the effects of gravity with a point load in the upper part of the prosthesis and (**f**) combines the effects of gravity with a point load placed in the lower part of the prosthesis. prone (on all fours) and lying supine. These are the most frequent in a person's daily life. Figure 11 shows the results obtained under these load cases for displacements and stress. Maximum displacement of 11 mm and a stress of 4.1 Kpa were obtained for both weight conditions; although the magnitudes are the same, the distribution fields show variations in the interior of the prosthesis. The prosthesis shows a symmetrical contour without any problems and the form agrees with that reported by other works on breasts [21; 30; 52; 53]. Table 1 shows the comparison between the obtained displacements and those reported in the literature. In addition, the prosthesis shows a good distribution of stress. It can be observed that the displacement values (in the proposed prosthesis) are within the results reported by similar research. The differences presented in the values are due to the dimensions, \begin{table}
\begin{tabular}{c c c} \hline \hline
**Breast Position** & **Maximum Displacement Obtained (mm)** & **Maximum Displacement Reported (mm)** \\ \hline Standing & 26 & 27.5 [22], 30 [50], 20 [31] \\ Prone & 11.06 & 15.6 [53], 24 [27]] \\ Supine & 11.06 & 11 [44], 14 [24] \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Comparison of obtained displacements with those reported. Figure 10: Displacement and Von Mises stress contour plots for case “a”. Figure 11: Displacement and Von Mises stress contour plots for case “b” and “c”, respectively. materials and conditions of each computational model or experimental model that were used. Load cases \"d\", \"e\" and \"f\" are suggested for this work with the aim of evaluating the sensitivity of the prosthesis; these cases consist of the combined effect of gravity and a palpation force applied in the model. Case \"d\" presents a horizontal force of 5 N applied to the nipple region; the results, seen in Figure 12, demonstrate that the combination of these weights achieves a uniform distribution in the lower part of the prosthesis. This quality in the prosthesis translates into a natural behavior and a good response to touch, preventing undesirable behaviors such as collapses or ruptures of the material and a bad buffering against exerted pressure. The results obtained for weight case \"e\", which combines the effects of gravity with a point load in the upper part of the prosthesis, demonstrating that the shape of the prosthesis is suitable, and the distribution of stress is symmetrical. For the last case, \"f\" combines the effects of gravity with a point load placed in the lower part of the prosthesis.