Research Information System
JOURNAL OF ADVANCED PROSTHODONTICS, vol.14, no.6, pp.346-359, 2022 (SCI-Expanded)
PURPOSE. Four and six implant-supported fixed full-arch prostheses with
various framework materials were assessed under different loading conditions.
MATERIALS AND METHODS. In the edentulous maxilla, the implants were
positioned in a configuration of four to six implant modalities. CoCr, Ti, ZrO2,
and PEEK materials were used to produce the prosthetic structure. Using finite
element stress analysis, the first molar was subjected to a 200 N axial and 45°
oblique force. Stresses were measured on the bone, implants, abutment screw,
abutment, and prosthetic screw. The Von Mises, maximum, and minimum
principal stress values were calculated and compared. RESULTS. The maximum
and minimum principal stresses in bone were determined as CoCr < ZrO2 < Ti
< PEEK. The Von Mises stresses on the implant, implant screw, abutment, and
prosthetic screws were determined as CoCr < ZrO2 < Ti < PEEK. The highest Von
Mises stress was 9584.4 Mpa in PEEK material on the prosthetic screw under 4
implant-oblique loading. The highest maximum principal stress value in bone was
found to be 120.89 Mpa, for PEEK in 4 implant-oblique loading. CONCLUSION.
For four and six implant-supported structures, and depending on the loading
condition, the system accumulated different stresses. The distribution of stress
was reduced in materials with a high elastic modulus. When choosing materials
for implant-supported fixed prostheses, it is essential to consider both the
number of implants and the mechanical and physical attributes of the framework
material. [J Adv Prosthodont 2022;14:346-59]