[Aspects of the biological behaviour of the rubber RS 330T-RTV silicon material]. / Aspecte ale comportamentului biologic al materialului siliconic rubber rs 330T-RTV.

The resorption and atrophy of the prosthodontic prosthetic field via the mobile restorations made of flexible acrylate, constitutes a controversial problem in the specialty literature, determining the interest of the clinicians with regard to the counterattacking or improving this process inherent to the indentation evolution. The study aims at analyzing the biological behavior of the silicon type RUBBER RS 330T-RTV, a material often used in the creation of the maxilo-facial prosthetics. The method proposed by us has the object of lining the prosthetics made of flexible acrylic type Valplast with this type of silicon. The practical aspects have been forwarded by the biocompatibility studies, applied to the silicon test-tubes, made in the dental technique laboratory, or to the hypodermic implants at the rodent laboratory animals. At the macroscopic examination it can be observed that the silicon fragment maintains it's almost parallelepiped form. The microscopic exam reveals structural mending phenomena, initially mainly the lymphohistocyte cells, and then mainly the fibrous cells. Biocompatibility aspects certifiable at the RUBBER RS 330T-RTV silicon material are fully according to the biocompatibility notions afferent to the silicon materials. Key words:

[The biomechanical behaviour of the flexible acrylic partial prosthetics]. / Comportamentul biomecanic al protezelor partiale din acrilat flexibil.

UNLABELLED: The simulation methods constitute a modern method absolutely necessary at the forerunner stage of the practical unwinding of the research stages, outlining the precise directions for the practical application, the final results influencing the dental practice. AIM: Our study proposes itself to analyze through the method of the finite element the status of the tension and the deformations registered at the level of the partially extended indentured prosthetic field and at the level of the partially flexible acrylic prosthetics. MATERIAL AND METHOD: The first step was constituted by the realization of CT followed by their scanning and the usage of the material constants. Following the tomographic computer exam at the patients submitted to the study, it was observed a resorption and an important atrophy at the level of the jaw indented crest, after a period of four months, with the flexible prosthetics type Valplast, this aspect having profound clinical and viability implications to the selected therapy solution. RESULTS: For the 3D reconstruction of the different types of partial extended indentation the Amira universal program was used for the 3D reconstructions for any type of Tomographic Computer. Following the 3D reconstructions of the information obtained on the tomographic computer on the images it can be observed an important resorption of the jaw bone in the area of the edentulous space with an acrylic flexible prosthetics. The intrusion of the silicon material Rubber type, as a viable solution for the reduction of the absorption rate and atrophy of the partially indented prosthetics field, has results proportional to the type of the force applied and the applying of this. CONCLUSIONS: The simulation of the real clinical situations following the contribution of the tomographic computer constitutes a highly important stage in the evaluation of the degree of resorption and atrophy at the level of the indented crests, process whose parameters are influenced by the factorial accumulation with a profound impact in the clinical result.