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Masters Thesis | Dentistry | India | Volume 11 Issue 12, December 2022

Effect of Masticatory Load on Abutment Screw Loosening of Three Different Types of Metal Ceramic Implant Crowns - A 3 Dimensional Fea Study

Dr. Neeraja B | Dr. Sivaranjani Gali | Dr. Babashankar Alva

Abstract: Purpose: To evaluate and compare masticatory load on abutment screw loosening of three types of implant prosthesis- screw, cement and screw cement retained prosthesis and effect of prosthesis on stress distribution in peri - implant area. Material & Methods: A Three Dimensional (3D) finite element model of edentulous mandibular molar region, geometric model of the implants, abutments, screws and crowns were modelled by using reverse engineering technique. Three models cement retained, screw-cement retained, screw retained implant prosthesis models were simulated for the study. A solid 4mm tapered, screw type implant 13mm long (CMI II) was selected for the study. Three straight abutments, (Nobel Biocare) were modeled through reverse engineering and were used for the implant. A titanium abutment screw was also modeled to fit in the abutment. The loads applied were static and were uniformly applied throughout the occlusal surface of the superstructure. A masticatory load at the rate of 100 N at 20,000 cycles for 1 second followed by 1 second of no loading will applied3 and will be repeated till the screw loosens. Results: Maximum Von Mises stress values on vertical loading were observed on the abutment screw of all the three implant prosthesis. The abutment screw of cement-screw prosthesis showed fatique earlier than the cement and screw retained prosthesis. With respect to bone structure, the maximum Von Mises stress values were observed in the cement retained implant prosthesis, followed by screw retained implant prosthesis and in Screw-Cement retained implant prosthesis. Conclusion: Within the limitations of the study, the study showed that Screw- Cement retained prosthesis showed early screw loosening followed by cement retained and then screw retained implant prosthesis.

Keywords: Abutment Screw Loosening, Cement retained implant prosthesis, Screw retained implant prosthesis, Screw- cement retained implant prosthesis, Metal Ceramic implant crowns

Edition: Volume 11 Issue 12, December 2022,

Pages: 440 - 456

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