Original Research Article
Year: 2020 | Month: February | Volume: 10 | Issue: 2 | Pages: 253-258
Finite Element Analysis of Crown to Implant Ratio on Stresses around Short Wide Implants – Part 1
Malathi Dayalan1, Ritika Sampath Kumar2, Meer Saher Altaf3, Syeda Rahath Fatima3
1Professor, 2MDS Prosthodontist, 3Post Graduate student,
Department of Prosthodontics, the Oxford Dental College, Bangalore-560068.
Corresponding Author: Syeda Rahath Fatima
ABSTRACT
Purpose: The purpose of the study is to evaluate the influence of crown to implant ratio on the stress around short wide implants and to compare short cylindrical implant to short conical implant using a finite element analysis method.
Materials and method: A total of four models was constructed with internal hex cylindrical implants and tapered conical short implants both measuring 5mm in diameter and 6 mm in length and corresponding crowns to simulate 1:1 and 2:1 crown implant ratios using HYPERMESH 10 software. CBCT images of the maxilla were converted to stereo lithography file. A vertical bite force of 150N that simulate masticatory force was applied axially and obliquely.
Results: On comparison, cylindrical implants showed better stress distribution throughout the implant but in conical implants it was concentrated at the crestal region. Irrespective of the geometry and/ or C/I ratio, both the implants showed significant increase in stresses at the bone and implant under oblique loading.
Conclusion: Maximum von Mises stresses were found in the crestal region of both the implants with 2:1 crown implant ratio. The stresses were concentrated more in the crestal region when compared to cortical bone and trabecular bone. In cylindrical implants, stresses were distributed along implant body when compared to tapered conical implants where stresses were concentrated at the crestal region.Greater stresses were generated by oblique forces when compared to axial forces.
Key words: Short dental implants, finite-element method, crown implant ratio, internal hex, tapered implants, and cylindrical implant.