دانلود رایگان مقاله مسیر گرفتگی و یک مفهوم از یک دستگاه برای آزمایش عمر عملکرد دندان مصنوعی

Abstract

Purpose This paper presents an original method for the assessment of occlusion trajectory. On this basis, a special device for the assessment of operating life of dentures was designed. Material/methods For this purpose, the SMART system by BTS for a comprehensive movement analysis was used. In order to analyze occlusion trajectory, characteristic points on patients’ heads were appointed in which markers were placed, in accordance with the rules of measurement in dentistry. Markers’ movement was recorded by means of 6 cameras, and then composition of coordinates was performed in a 3D system. Results In this way, curves representing movements of the characteristic points were plotted which, after the composition, with a considerable approximation, can be regarded as occlusion trajectory. Conclusions On the basis of the obtained results, a thesis was put forward to the effect that traditional tribological testing machines based on systems of the pin-on-disc, ball-on-disc, etc. types, due to the simplicity of their working movements, are not adequately precise for the purpose of operational assessment of elements of prosthodontics. On this basis, a tribological node for a specialist testing machine for the assessment of operating life of dentures was designed.

5. Conclusions

The paper presents a proposal for a method of assessment of occlusion trajectory during mastication. The SMART system was used for the test, and an assistance of seven volunteers was obtained. The performed tests allowed to build a trajectory of movements of markers placed in characteristic spots on the head. A 3D composition of the obtained individual movement curves was performed, which resulted in obtaining a signal that was a composite of movements in the three adapted axes. The 3D graphs thus created allowed to formulate the following general conclusions: 1. During the process of mastication, in this particular case, we deal with complex movements in three axes. It should be added that all three movements (along the X, Y and Z axes) occur simultaneously. This movement is characterized by an asymmetry in relation to the adapted coordinate system, while the obtained curvatures are similar in shape to sections of an ellipsis or a parabola (however, a detailed analysis of these shapes was omitted). 2. On the basis of the obtained results, a thesis was put forward to the effect that traditional tribological testing machines based on systems of the pin-on-disc, ball-on-disc, etc. types, due to the simplicity of their working movements, are not adequately precise for the purpose of operational assessment of elements of prosthodontics. It is believed that using traditional tribological testers is adequate for qualitative comparison of dental materials with each other and in relation to other alternative materials. These tests, however, do not reflect real states of external inductions in the oral cavity. Furthermore, designs of traditional testing machines do not allow for an assessment of the whole orthotic construction, but rather of a single element only. In this sense, there appears a necessity for the design of a testing machine that would reflect the kinematics of movement and the microclimate of the oral cavity as closely as possible, and make it possible to test whole orthotic constructions. Only then can more substantial assumptions on the operational quality of elements of prosthodontics elements be made.