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Implant Anchorage Stability under the Effect of the Inserting Angulation and Depth

Author: XieLei
Tutor: YuanXiaoPing
School: Luzhou Medical College
Course: Journal of Orthodontics
Keywords: Cortical bone Planting nails Cancellous bone Three - dimensional finite element
CLC: R783.6
Type: Master's thesis
Year: 2011
Downloads: 78
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Abstract

Objective: To using Pro/ENGINEER4.0 Software, the establishment of similar characteristics and clinical implant three-dimensional solid model of the cortical bone, cancellous bone. Three-dimensional finite element analysis of implant anchorage in the implantation angle and the thickness of the cortical bone changes affect its stability and implant in the bone stress, strain the law to provide the scientific basis for the clinical implant . Method: 1. Application Pro \\ E4.0 software, establishing the cancellous bone implants and different thickness of cortical bone solid model, solid model of the cortical bone thickness to 1mm --- 8mm range, each 1mm increments, a total of 8 solid model. Pro \\ E4.0 software assembly implant to 30 °, 45 °, 60 °, 75 ° and 90 ° respectively assembly contains the bones of the cortical bone, cancellous bone, a total of 40 conditions to. sat format export saved. The. Sat file directly input MSC.patran before processing and three-dimensional model mesh locally refined to produce. Iges format files. 3 Using MSC Marc. Mentat finite element analysis soft set implant, cortical bone, cancellous bone material parameters; cortical bone, cancellous bone-implant contact relationship; bone block simulation cultivation nail in the constraints: four corners defined constraints cortical bone and bone spongy bone its X, Y, Z axis degree of freedom 0; the implant neck center point at 200g orthodontic force is applied parallel to the bone complex. Comparison, analysis of the impact of the different angles and the thickness of the cortical bone implant stability, to calculate the three-dimensional finite element model of each node of each condition in the case of force stress and strain data. Collection the von mises representative stress analysis for each condition stress changes and plot the stress line chart, the stress distribution nephogram. The results: 1. Precise and meticulous implant accurate, three-dimensional geometric model of the cortical bone, cancellous bone, meshing reasonable; reconstruction of the biological model of morphological similarity; model applicability; mechanical properties reflect the high accuracy. 2 of the same length implant the more inclined implantation more will shorten the effective length of the implant in the bone. 3 40 conditions, von mises stress range between 35.9MPa-12.6MPa, this range is relatively safe and does not cause the absorption and destruction of the bone cortex. Analysis of von mises stress found mostly 30 degree angle of stress gt; 45 degrees gt; 90 degrees gt; 60 degrees gt; 75 degrees. 5.von mises stress change with increased bone cortical thickness decreased. Conclusion: The implant anchorage in orthodontic force can maintain stability, is to determine whether the key to success. In this study, using the finite element method to analyze implant on different implantation angles and different thickness of the cortical bone 1. Reliable experimental methods, the results are correct, reasonable analysis indicators selection results true. Implant in the case of the same thickness of the cortical bone, the implantation angle is 30 degrees, 45 degrees, due to the inclination angle is too small to cause implantation of the staple planted shorten the effective length of the cortical bone, and a 90 degrees too upright bone cortex reduction Both of these situations lead to stress stability is not conducive to planting nails are too concentrated. 60 degrees, 75 degrees both take full advantage of the cortical bone support resistance, also reducing the local stress is too large, to prompt clinical select angle of about 60 degrees -75 degrees operation. 3 same implantable angle in the case of different thickness of cortical bone, the von Mises stress increased with the thickness of cortical bone and gradually reduce. The increase in the thickness of the cortical bone will improve the stability of the implant. Von mises stress concentration areas implants in cortical bone and cancellous bone bone at the junction. 5 completely maxillary bone implant cortical bone within the implant stress concentration points not in just at the junction of the bone interface, but concentrated in the implant neck. 6 in the case of the thickness of the cortical bone than 1mm, loaded under different implant angles 200g orthodontic traction caused by the von Mises stress in a safe range, does not cause bone resorption and other issues.

Implant Anchorage Stability under the Effect of the Inserting Angulation and Depth

Abstract

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