Abstract
Biomechanical conditions affect the stress-strain state of teeth, dentures, implants and surrounding tissues, however, some biomechanical processes in implants and covering prosthetic structures have not been sufficiently studied under different operating conditions. The purpose of the study. А comparative analysis of the maximum stresses in titanium implants, abutments and covering ceramic crowns under different biomechanical operating conditions. Material and methods. Three-dimensional mathematical modeling of the stress-strain state of the implant, abutment, crown was carried out using the SolidWork computer program in a model of an implant immersed in a segment of the mandible and covered with a ceramic crown. Load conditions: vertical or inclined 45° with a value of 150 N. Well-known indicators of the physical and mechanical properties of fabrics and structural materials were used. Adverse biomechanical conditions were simulated: a 30% reduction in the length, diameter, length and diameter of the implant; an abutment slope of 15° and 30°; bone resorption by 30% and 50%; increased load by 30%; occlusive supracontact; contact with bone tissue by 50% (immediate load). Results and discussions. In comparison with optimal biomechanical conditions, the stresses in the implant and the covering crown increase under vertical and inclined loads only with an increase in load and the presence of occlusive supracontact. An increase in stresses only in the implant occurs with a decrease in the diameter of the implant, a combined decrease in the diameter and length of the implant, with an abutment tilt, resorption of periimplant bone tissue, incomplete contact of the implant with bone tissue under immediate load. Stress reduction in the implant and the covering crown occurs when the length of the implant decreases. Conclusions. Unfavorable biomechanical conditions in most cases lead to an increase in stresses in the implant, especially with inclined loading; the decrease in stresses in the implant with a decrease in the length of the implant is most likely due to an increase in stresses in the surrounding bone tissue.
Published Version
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