The aim of the study is to compare stresses induced onto implant-bone interface, implants & denture bases on using cobalt Chromium (Cr-Co) and Titanium (Ti) framework materials.
Methodology:
Three dimensional finite element models of completely edentulous maxilla rehabilitated with ALL on 4 implant prostheses, (Two vertical anterior implants & two posterior implants 20°,30°, 45° mesially tilted ) , Cr-Co & Ti framework materials were constructed. Bilateral axial load of 100 N was applied onto the palatal cusps of maxillary posterior teeth. The resultant equivalent Von Misses stresses at areas of interest were calculated.
Results:
The Von Mises stresses induced in bone were 5.132 & 6.144 Mpa in model I & IV / 2.403 & 2.272 Mpa in model II & V /13.937 & 14.591 Mpa in model III & VI respectively .
The stresses induced in denture bases were 225.25 & 218.91 Mpa in model I & IV, 156.74 & 170.19 Mpa in model II & V, 227.25 & 159.99 Mpa in model III & VI respectively.
The stresses induced in implants were 26.591 & 31.315 Mpa in model I & IV, 18.322 & 26.42 Mpa in model II & V / 117.29 & 117.66 Mpa in model III & VI respectively.
Conclusions:
Within the limitations of this study, we may conclude:
• The more rigid the framework, the less stress dissipation onto the surrounding structures.
• Posterior implants tilted mesially may reduce the stresses induced onto implants & surrounding structures.