Обоснование применения нового базисного материала в ортопедической стоматологии

Abstract

Авторы приводят физико-химическое исследование различных сополимеров полипропилена с целью разработки нового базисного материала для съемных пластиночных протезов. Основным методом изучения был пиролиз образцов с последующим анализом методом газовой хроматографии его продуктов. В результате исследований авторы определили, что опти-мальным для использования в целях дентального протезирования является сополимер Tipplen R 359.

Improvement denture material by applying various copolymers of polypropylene and to improve their physical and chemical properties. For this purpose, copolymer of ethylene with propylene has chosen. For analysis, a polypropylene copolymer special block attached directly to the input of a gas chromatograph was used. Samples (2 mg) were heated for 18 seconds up to a maximum temperature 550°. During pyrolysis the carrier gas displaces the products of pyrolysis in a separatory funnel. A pyrolytic cell detached from the carrier gas 1 min after initiation of pyrolysis. There were studied copolymers of ethylene with propylene, containing from 0 to 100% propylene.Results. Composition of the pyrolysis products is the same for different samples of polypropylene.Large peak area of propane indicates that with polypropylene depolymerization is a very important process. There also studied the process of degradation of polyethylene copolymers and polypropylene, flowing through radical mechanisms. It is shown that as a result of degradation of these polymers, most products formed by intramolecular chain transfer. As material for the manufacturing of removable dental denture, it is more expedient to use the copolymers and not blends of polypropylene and polyethylene due to the presence in the latter of impurities that can significantly affect the processes occurring in the mouth during use of prostheses.