The Use of Diacrylic Resins in Dental Restorations

Abstract

The materials as well as the procedures used successfully in modern dental restorations are based on scientific selection criteria, which can predict outstanding results, both in terms of physiological aspects and the durability of the performed maneuvers.The rationale of using certain materials, as the success or failure in using certain techniques, has contributed to the evolution of dental restorations. The optimal way to combine the material with its applicability and finishing technique implies an exhaustive approach to the subject that still requires research, that adress to specialists, in order to improve its refinement and development.Among the restoration materials, those that satisfy the aesthetic requirements of the patients are considered to be composite resins. With all the advantages resulted from their intrinsic characteristics, it should be noted that composite resins still have inconveniences, primarily linked to the polymerization shrinkage, which causes a gap between the obturation and the dental tissue, resulting in the formationof marginal microinfiltrations with all the drawbacks associated with it. The purpose of the experimental research is to evaluate the marginal microinfiltrations at the level of the class II cavities restoration with composite diacrylic resins, according to various techniques of restoration and to establish the optimal technique to minimize side effects.

Comparative Studies on the Electrical and Mechanical Behavior of Some Soldering and / or Impregnation Lacquers

“…The lacquers are synthetic polymeric materials (epoxy [1][2][3][4][5], acrylic [6][7][8], ester [9,10], polyurethane [11] etc.) or natural (plant extracts such as Urushi [12,13], insect secretion -Shellac [14,15]).…”

Ageing of Some Lacquers Due to Microbiological Stress

“…specific to the exploitation environment of electrical equipment, the lacquers based on polymer materials suffer ageing processes that degrade their functional physical-chemical properties [6,7], which lead to the reduction of the equipment life. Lacquers based on polyurethane [8], epoxy resins [9][10][11][12][13], polyesters [14,15], acrylics [15,17], alkyl-epoxy-melamine copolymers [18], etc., are usually used in the electrical applications for various purposes. According to the place of use, they are exposed to thermo-oxidative stress [19], the microorganisms action, electrical stress, mechanical stress, etc.…”