: the evaluation of the changes created by endosteal i̇mplants i̇nstalled i̇n different length, angle and diameter on maxilla and mandible with three dimensional modeling and finite elements stress analysis

Since Branemark introduced the concept of osseointegration in 1969, the use of implants for oral and maxillofacial rehabilitation has rapidly increased. Biomechanical factors play a substantial role in implant success in long and short term. The factors that effect the stress disturibution on bone are implant material, implant designment, body work material, implant rate, the quality and quantity of surrounding bone and implant-bone interface. The dentists can change the stress on alveole bone by preferring the implants of different geometry and types. The micro geometry of implant includes diameter, length and Thread-form Configuration. The diameter of implant?s placement on alveole bone is also a factor that effects the stress. The application of occlusal forces induces stresses and strains within the implant-prosthesis complex and effects the bone remodeling process around implants. In order to achieve optimized biomechanical conditions for implant-supported prostheses, conscientious consideration of the biomechanical factors that influence prosthesis success is essential. Since, bone internal stress and strain cannot be measured in vivo, various invitro studies are conducted by using biomechanic rules. In our invitro study, six dental implants which were at two different diameters (3,7 mm, 4,7 mm) and at three different lengths (5 mm, 10 mm, 13, mm) belonging to these diameters were chosen. Totally 24 models were obtained by placing the implants of six different dimensions in maxilla and mandible vertically and angularly, and one by one. Abutment and metal backed ceramic crown was placed in implants again in virtual platform. Totally 48 study groups were obtained by applying force to the specific points of metal backed ceramic crowns vertically and obliquely. The effect of implant diameter, implant length and bone type to the values of maximum and minimum principle stress occurred in cortical and spongioz bone and values of Von Misses stress occurred in implants as the result of the forces applied was investigated by using Finite Elements Analysis (FEM).