Search for: [Abstract = "Claspless prostheses are denture solutions of not only aesthetic values, but are also beneficial from the biomechanical point of view. A frequent type of edentulous areas restored with claspless dentures are bilateral mandibular free\-ends. Purpose The purpose of the paper is to analyze the biomechanical operating conditions of various systems of claspless anchorage of dentures, in the aspect of selection of a functionally optimal construction solution for frame dentures applied in cases of bilateral mandibular free\-ends. Therefore, it is assumed that the studies performed will allow for answering a question that is important for clinical practice, namely whether if it is necessary while using claspless abutments to interlock the natural abutment teeth and which of the stabilizing and supporting elements allow for achieving the most beneficial clinical effect in using the mandibular alar prostheses. Material and method In the studies performed, the basis for assessment of various construction solutions of dentures was the analysis of load bone by construction elements, particularly the spatial distribution of the load in the most exposed tissues of the mucous and bone base, as well as abutment teeth. Modeling of the load bone and functioning of dentures requires considering the non\-linear character of the mechanicalbiological system. The non\-linearity is related both to live tissues in the patient, and to the structure and operating principle of prosthesis. In own FEM models, three types of non\-linearity were considered\: geometric, material and non\-linearity related to the change of terminal conditions. Calculations were performed on a PC computer with Intel Pentium IV 3 GHz processor and Strand 7 Software by G\+D Computing as the digital environment to generate the numerical model of prosthetic base with bilateral free\-ends, namely edentulous molar areas with preserved anterior\-lateral arch up to second premolars inclusive. Designing of the model with the finite elements method comprised the following stages\: 1\) use of numerical bar models as simplified mathematical models, 2\) performance of individual models of premolars obtained with tri\-dimensional analysis \(scanning\) of roots of premolars extracted for orthodontic reasons, 3\) generalization of mathematic models of the roots of abutment teeth in the form of double cut cones for the purpose of obtaining a 3D model of finite elements of the prosthetic base, 4\) performance of the analysis on the axially symmetrical 3D models of prostheses and the analysis on twodimensional models constituting their axial cross\-sections. The prosthesis comprised fixed restorations, namely crowns fixed to the patient's own abutment teeth, made of chromium\-cobalt alloy. Together with the crown, on the common metal frame, there 7 was a part of the abutments anchoring the removable denture, namely the counter\-elements of latches and clips. The other part of the abutment, namely the matrix, strictly matching the counter\-element, was placed in the alar prosthesis, also made of chromium\-cobalt alloy. The analysis was performed on numerical models of claspless restorations of mandibular frame dentures, in the following variants\: using clips, latches with or without interlocking crowns, and using supporting elements in the form of thorns and interlocks®. Models analyzed include\: model A – single crowns with cylindrical latches connected to the frame denture, model B – single crowns with lateral clips connected to the frame denture, model C – multi\-unit crowns with cylindrical latches connected to the frame denture, model D – multi\-unit crowns with lateral clips connected to the frame denture, model E – multi\-unit crowns with cylindrical latches and interlocks® placed between the crowns, connected to the frame denture, model F – multi\-unit crowns with lateral clips and interlocks® placed between the crowns, connected to the frame denture."]

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