Effect of supporting implants inclination on stability of fixed partial denture: A finite element study

Abstract

The aim of this finite element study was to analyze effect of supporting implants inclination on stress distribution in the bone for a four-unit fixed partial denture. A three-dimensional finite element model of mandibular molar section of the bone to receive implants was constructed. Three implant-supported fixed partial dentures, with null, moderate and wide tilting, of 0°, 15° and 30° implant inclinations, respectively, were modeled. A mechanical load of 10 MPa was applied in coronal–apical direction on bridge framework at the regions of crowns positions. The finite element analysis was performed, and von Mises stress levels were calculated. Peak stress concentration in the cortical bone was observed mostly around the implant necks, in inter-implants line. There was favorable stress distribution during loading, with peak stress being 90.04 MPa for 0°, which decreased to 54.33 MPa for 15° and 46.36 MPa for 30° inclination. The supporting implants inclination in fixed partial denture plays an important role in stress distribution and may be helpful in preventing bone loss and implant failure. This phenomenon is likely to be more pronounced in bones of poor quality. Within the limitation of this study, it seems that the inclination of implants in fixed partial denture has a favorable effect on stress distribution pattern values around the supporting implants.

Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

“…26,27 However, few studies exist on the in vitro effect of posterior implant's inclination on the bone resorption and survival rates of the implant-supported fixed partial dentures, which makes our study results valuable. 16,17,[28][29][30] Our study exhibited that stress values for the crestal bone were the highest around the tilted posterior implants for both loading modes, which is in agreement with two previous studies. 16,17 Posterior implant inclination caused 34.25% higher bone stress for vertical loading, and 40.52% higher stress for oblique loading but this was the average of two peri-implant bone areas.…”

Effect of crown retention systems and loading direction on the stress magnitude of posterior implant-supported restorations: A 3D-FEA

“…It's essential to emphasize that finite element simulation serves as a valuable tool for predicting specific behaviors in controlled scenarios. This capability can prove highly effective in guiding future treatment decisions [ 42 ]. Based on the findings of this study, future research in implant-supported restorations should emphasize longitudinal clinical studies to evaluate the longevity and performance of various crown retention systems.…”

Design and analysis of multi-material structures of 3D printed implants of mandible

“…These FEA studies are evaluated biomechanical behaviour of the mandible and predicted the high-stress levels at the condyle region of the mandible and identified the failures of mandible [19,20]. From the literatures, we conclude that the different topological and structural response of the implants for maxillo facial regions with porous structures of mechanical behaviour gives insight for further study on the design of multi-material structures using the 3D printer approach [21][22][23][24][25].…”