کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3145482 1197079 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of artificial saliva on abrasive wear and microhardness of dental composites filled with nanoparticles
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی دندانپزشکی، جراحی دهان و پزشکی
پیش نمایش صفحه اول مقاله
Influence of artificial saliva on abrasive wear and microhardness of dental composites filled with nanoparticles
چکیده انگلیسی

ObjectivesThe aim of this study is to compare the wear resistance and hardness of two dental nanohybrid composites and to evaluate the influence of artificial saliva storage on those properties.MethodsSpecimens were made from two commercial nanohybrid dental composites (Esthet-X®-Dentsply and Filtek Supreme®-3M). Abrasion tests were carried out in a ball-cratering machine (three body abrasion) and microscopic analysis of the wear surfaces was made using optical and scanning electron microscopy; hardness was quantified by Vickers hardness test. Those tests were repeated on specimens stored in artificial saliva.ResultsResults show that the wear rate of the studied materials is within 10−7 mm3/N mm range, one of the composites presenting wear rate twice as large as the other. After storage in artificial saliva, the wear resistance increases for both materials. Microhardness of the composites is around 52 and 64 HV, Esthet-X® presents higher hardness values than Filtek Supreme®. After storage in artificial saliva, the microhardness of both materials decreases. Data were analyzed using ANOVA test, p ≤ 0.05.ConclusionsArtificial saliva storage increases the materials’ wear resistance, suggesting that in both materials bulk post-cure takes place and saliva absorption occurs only on the surface of the composites. This effect was confirmed by comparing the Vickers hardness before and after artificial saliva treatment and FTIR analyses. Surface microhardness of the composites decreases after storage in artificial saliva whereas bulk microhardness of the materials increases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dentistry - Volume 36, Issue 9, September 2008, Pages 703–710
نویسندگان
, , ,