Abstract
Influence Of Light Source And Photopolymerization Distance On Composite Resin Microhardness.
Highlights
The availability of resin systems activated by light led to the development of a wide variety of technologies to produce the necessary light to their use, as for example: the quartz-tungsten halogen light (QTH), is mostly used by professionals[2], and the light produced by diode (LED)[3], was introduced in 1995, have a wave length between 450-490nm, with a peak of 470nm[4]
The microhardness tests have been an adequate indicator regarding the conversion degree of monomers in polymers[11], allowing investigation if the light source is capable of polymerize the restoration body properly
The objective of the present study was to evaluate in vitro the influence of two light sources on the microhardness of the photopolymerized composite resins in four different distances (1mm, 2mm, 3mm, 4mm) of the material surface
Summary
The search for excellence in esthetic dentistry and the high demand of esthetical procedures, had proportioned to development of the new studies to evaluate composite resin behavior, besides refining equipments and photopolymerization techniques[1] as well as reducing the clinical time spent in restorations by the professional.The availability of resin systems activated by light led to the development of a wide variety of technologies to produce the necessary light to their use, as for example: the quartz-tungsten halogen light (QTH), is mostly used by professionals[2], and the light produced by diode (LED)[3], was introduced in 1995, have a wave length between 450-490nm, with a peak of 470nm[4].In order to obtain an appropriate photopolymerization of a composite resin, it is necessary the right amount of light intensity[5], time and adequate wavelenght[6]. The decrease on the mechanic properties of hardness is an indicative of a lesser conversion measurement by the presence of residual monomers[9]. In this aspect, a correlation has been established between the microhardness of the material and the polymerization degree[10]. A correlation has been established between the microhardness of the material and the polymerization degree[10] From this way, the microhardness tests have been an adequate indicator regarding the conversion degree of monomers in polymers[11], allowing investigation if the light source is capable of polymerize the restoration body properly. The microhardness can be a simple test to obtain information of the materials properties[12]
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