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In the modern dental surgery, due to the misoperation during the surgery or the higher loading force suffered for long time, the situation of the central screw fracture usually occurs, and thus which may result in the failure of the surgery or of implant prosthesis; and aiming at this fact, we now designed a kind of dental implant system which may satisfy the requirement of convenient restoration after the central screw factures. The advantage of this dental implant system was that, after the central screw facture occurs, we can replace the central screw for restoration directly without needing to take out the centre screw which had broken within the dental implant. By means of the finite element analysis, we can get to know that, if a torque equal to 30N.CM is inflicted on the original central screw, the dental implant system may produce a maximum equivalent stress equal to 828.49MPA while if a torque equal to 60N.cm is inflicted on the central screw used for restoration, the dental implant system may produce a maximum equivalent stress equal to 526.44MPA. Thus the torsional property of the dental implant system after restoration was improved significantly on the contrary. Furthermore, we analyzed the occlusal force and the fatigue aimed at the dental implant system after restoration revealed, and we analyzed the mechanics and the fatigue status of the dental implant system and the osseous tissue by means of inflicting a force to the dental crown, which was equal to 300N and the angel between which and the upright direct was equal to 0,15°,30°and 45°respectively under the implantation status in the horizontal bone and implantation status in the stimulated osteanabrosis of 2mm. The above analysis revealed that, the maximum equivalent stress produced by the restorable implant system was lower than its yield strength, and the minimum safety factor was higher than 1. Furthermore, this type of dental implant system has superior safety, and it is convenient for restoration and fit for the modern dentistry implant surgery, thus it has a giant application potential.

Design and the Reliability Research of the Restorable Dental Implant System Aiming At the Central Screw Fracture