Issue 67

T. Diburov et alii, Frattura ed Integrità Strutturale, 67 (2024) 259-279; DOI: 10.3221/IGF-ESIS.67.19

96 MPa

(c) Figure 5: The distributions of equivalent stresses (a, c) and strains (b) at the installation of the Zygan implant in the upper left position; (a) general view; (c) stresses in bone tissue. Fig. 6 presents distributions of equivalent stresses and strains at the installation of the Oncology implant in the lower left position. As in all the above-described cases, the maximum  eq value of 183 MPa was observed at the “implant–zygomatic bone” interface, which was lower by ~20 MPa than that for the right position according to Fig. 4. A more detailed view of the  eq distribution showed that their values did not exceed 128 MPa in the zygomatic bone, which was higher by ~30 MPa than that for the right position. According to Fig. 6, b, the  eq maximum values were within 1.4% in bone tissue (in contrast to  eq ~1.3% for the Oncology implant shown in Fig. 4, b). The maximum values of equivalent stresses and strains, determined in four performed calculations, are summarized in Tab. 3.

Maximum equivalent stresses and strains

No.

Type and position of implant

in structure, MPa

in zygomatic bone, MPa

in zygomatic bone, %

1

Zygan, the upper left position

263

118

1.6

2

Oncology, the lower right position

201

92

1.3

3

Zygan, the upper left position

244

90

1.1

4

Oncology, the lower left position

183

128

1.4

Table 3: The SSS parameters for the installed single zygomatic implants.

0.014

183 MPa

(a)

(b)

268