ANALYSIS OF STRENGTH CHARACTERISTICS OF CEMENT-SCREW FIXATION OF MULTI-UNIT ABUTMENTS TO DENTAL IMPLANTS WITH FLAT AND CONICAL TYPE OF CONNECTION IN EXPERIMENT

Purpose is to analyze the strength characteristics of the cement-screw fixation of multiunit abutments to dental implants with a planar and conical type of connection in an experiment under conditions of cyclic loads simulating functional loads in the oral cavity.
Methods. The strength characteristics of the cement-screw connection (CSC) of multiunit abutments to dental implants made of Ti-6Al-4V alloy with a diameter of 3.75 mm and a length of 11.5 mm with a conical and planar type of connection were evaluated. A total of 48 dental implants were included in the experiment – 24 with a planar and 24 with a conical type of connection. In turn, every 24 implants were divided into six groups depending on the experimental conditions: three groups with a loading angle of 22.5° and a force of 100 N with a number of loading cycles of 100 000, 150 000 and 200 000; three groups at loading angle of 45° and impact force of 100 N with number of loading cycles of 100 000, 150 000 and 200 000.
Results. In comparative analysis of the strength of experimental samples under maximum load conditions (loading angle of 45° and 200,000 loading cycles) in the 2nd position of the implant, as the weakest element of the entire structure, it was revealed that with the conical type, the depth of the CSC decreases by 19 %, and the degree of screw clamping – by 73 % from the initial level to the load, while with the planar type, similar parameters decrease by 33 % and 80 %, respectively.
Conclusion. It has been established that the conical type of connection is more reliable than the planar type, its use allows you to increase the resistance to loads, since the accumulation of fatigue of orthopedic structures with a conical multi-unit connection increases in 1.2 times, with a planar multi-unit connection – in 1.5 times. compound simulating the projection of the 2nd premolar) by 24 % compared to the planar type of compound.

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