title: Three-dimensional finite element analysis of immediate loading mini over denture implants with and without acrylonitrile O-ring.
abstract: OBJECTIVE
  The aim of the study was to check the stress absorbed by the bone around mini over-denture dental implant with and without acrylonitrile O-ring under two different loading conditions. The initial stress absorbed by the implant plays a significant role in the success of the immediate loading implants.
  
  
  METHODS
  A three-dimensional finite element analysis using Pro-E mechanical finite element software was used to check the stress absorbed by the bone with and without acrylonitrile O-ring. The implant and the mandible where modeled from the data obtained from C.T. scan and optical projector using reverse engineering process. Two different loading conditions of 80 N and 220 N were determined and the analysis was done.
  
  
  RESULTS
  The result showed at lower loads (80 N), there was not much difference in the stress absorbed by the cancellous bone with or without acrylonitrile O-ring, but at higher loads (220), there was difference in the stress absorbed by the cancellous bone with (0.03508 Mpa) and without acrylonitrile O-ring (3.874 Mpa) which showed that significant stress was absorbed by the acrylonitrile O-ring.
  
  
  CONCLUSIONS
  This study proves that higher loads during parafunctional movement were absorbed by the acrylonitrile O-ring increasing the success of the implants.
authors: Department of Prosthodontics, Indira Gandhi Institue of Dental Sciences, Pondicherry, India.
authors: Srinivasan
authors: S
authors: Jayaraman
authors: Sreekanth
authors: S
authors: Mallan
authors: Babu
authors: B
authors: Rajan
authors: Murugan Pazhaniappan
authors: MP
authors: Anachaperumal
mesh_terms: D000181:Acrylonitrile / Q000737:chemistry*; D000497:Alloys; D001696:Biomechanical Phenomena; D001732:Bite Force; D003722:Dental Alloys / Q000737:chemistry; D059605:Dental Implant-Abutment Design / Q000295:instrumentation; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003781:Denture Retention / Q000295:instrumentation*; D003828:Denture, Overlay; D055119:Elastic Modulus; D020724:Elastomers / Q000737:chemistry*; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D057893:Immediate Dental Implant Loading / Q000295:instrumentation / Q000379:methods*; D008334:Mandible / Q000502:physiology; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D000497:Alloys; D003722:Dental Alloys; D015921:Dental Implants; D020724:Elastomers; C031462:titanium alloy (TiAl6V4); D014025:Titanium; D000181:Acrylonitrile