Ti–15Mo Alloy Decreases the Stress Concentration in Mandibular Angle Fracture Internal Fixation Hardware
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2020-06-01
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Objectives: Comparison of the mechanical stability of 2.0 plates made of commercially pure titanium (cpTi) and a titanium–molybdenum (Ti–15Mo) alloy and two methods of internal fixation employed mandibular angle fractures, using 3D finite element analysis. Materials and Methods: Four groups were evaluated. For the cpTi: group Eng 1P, one 4-hole plate and 4 screws 6 mm long, in the tension zone of the mandible; group Eng 2P, two 4-hole plates, one in the tension zone of the mandible and the other in the compression zone, both were fixed with 8 screws 6 mm long. The same groups were created for the Ti–15Mo alloy. A 100 N compressive load was applied to the occlusal surface of the mandibular first molar on the plated side. Results: When considering the von Mises equivalent stress (σvM) values for the comparison between both groups with one plate, a decrease of 10.5% in the plate and a decrease of 29.0% in the screws for the Ti–15Mo group was observed. Comparing the same groups with two plates, a decrease of 28.5% in the screws was shown for the Ti–15Mo alloy group. No significant differences were observed when considering maximum and minimum principal stresses (σmax, σmin), and maximum principal strain (εmax) to the mandibular bone. The Ti–15Mo alloy plates substantially decreased the stress concentration in the screws for both internal fixation techniques and in the plate for the Ti–15Mo 1 plate group. Conclusion: From a clinical standpoint, the use of Ti–Mo alloy with reduced stiffness will decrease the stress shielding between the hardware and bone, influencing the outcome of the treatment.
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Journal of Maxillofacial and Oral Surgery, v. 19, n. 2, p. 314-320, 2020.
