牙科科学与医学杂志

抽象的

Influence of Crown-to-Implant Ratio on Stress Concentration of Fixed Dental Prosthesis in Shortened Dental Arch Concept

Güngör H

Purpose: The aim of this study was to evaluate the effect of crown-to-implant (C/I) ratio on the stress distributions in bone and implant under axial and oblique loads by using three-dimensional (3-D) finite element analysis (FEA) method in case of surgical procedures couldn’t be applied especially to the geriatric patients. Material and methods: Three maxillary bone models were created using with FEA methods. 4.1 x 10 mm ITI dental implants were embedded in first premolar site and one implant supported two-unit fixed dental prostheses were modeled. Shortened dental arch (SDA) concept was also modeled as a treatment option by means of implant supported fixed dental prosthesis. Three different (C/I) ratios (1/1, 1.5/1, and 2/1) were modeled in this study with a 6 mm cantilever extension. 300 N axial and oblique loads were applied to the all fixed dental prosthesis. The highest stress values were recorded and evaluated both in bone and implant. Results: The determined highest stress in cortical bone was -73.6 MPa under axial loads and -142.4 MPa under oblique loads for 2/1 C/I ratios. The highest von Mises stress value in implant was 312.7 MPa under axial load and 451.1 MPa under oblique load for the highest C/I ratio. With the increasing C/I ratio, stresses were increased both in bone and implant structure. Conclusion: Within the limitations of this FEA study, increasing C/I ratio increases the stress distribution in bone and implant. One implant supported two-unit cantilever fixed dental prosthesis may be one of the alternative treatment choices for the geriatric patients but this FEA study should be supported with the clinical studies.