The Evaluation of Hydrogen Peroxide Bleaching of Gonometa Postica Silk
نویسندگان
چکیده
Degradasie van Gonometa postica-sy as gevolg van bleiking is nie alleen ’n belangrike probleem vir verbruikers nie, maar ook vir die vervaardiger. Die doel met die navorsing was om die effek van waterstofperoksiedbleiking op G. postica-sy te bepaal. Die spesifieke doelstelling was om die invloed van temperatuur, pH en tydsduur op waterstofperoksiedvrystelling, kleurverskil, breekkrag en styfheid te meet.
منابع مشابه
A comparetive study of the effects of home and office bleaching on enamel surface roughness
Introduction: Increase in enamel surface roughness after bleaching is one of its major side effects. The purpose of this study is to compare changes in enamel surface roughness following bleaching with home versus office bleaching agents. Materials and Methods: In this experimental study, forty human sound premolar teeth were divided into 4 groups, randomly. Ten teeth were bleached using hydrog...
متن کاملImpaction of the rumen in cattle due to the ingestion of the cocoons of the Molopo caterpillar Gonometa postica (Walker).
Fig. 1 Gonometa postica: Moth, opened and entire cocoon. from rumen impaction in the North-Western Cape. Similar losses, reported by Edwards I from the Northern Transvaal in 1935, were caused by cocoons of the moth Gonometa rufubrennea. A related moth of the same genus, Gonometa postica (Walker) (fig. 1) occurs in the North-Western Cape, namely north of an imaginary line drawn from Mafeking to ...
متن کاملStructure and Properties of Silk from the African Wild Silkmoth Gonometa postica Reared Indoors
African wild silkmoth, Gonometa postica Walker (Lepidoptera: Lasiocampidae), were reared indoors in order to examine the influence of rearing conditions on the structure and properties of silk cocoon shells and degummed fibers by using a scanning electron microscope, an Instron tensile tester, and a thermogravimetric analyzer. The cocoons reared indoors showed inferior quality in weight, length...
متن کاملEffect of diode laser and light-emitting diode (LED) activated bleaching with 35% hydrogen peroxide on microleakage of class-V composite restorations: An in vitro study
Introduction: Residual oxygen-free radicals of bleaching agents before composite restorations can increase microleakage in enamel and dentin margins, and also various bleaching techniques are being developed using light sources. The present study was conducted to compare the effect of diode laser bleaching and LED activated bleaching on the microleakage of composite restorations. Materials & M...
متن کاملThe effects of two types of bleaching agents on color and translucency changes of three types of composite with or without surface rebounding
Background and Aims: The bleaching agents can lead to color and translucency changes in composite resins. Due to the increasing use of the nano composites and the silorane-based composites, this study aimed at examining the color and translucency changes of these restorations after bleaching agents. Materials and Methods: In this experimental - laboratory study, 198 composite discs were divide...
متن کامل