By a News Reporter-Staff News Editor at Health & Medicine Week -- A new study on Dentistry is now available. According to news reporting from Milwaukee, Wisconsin, by NewsRx journalists, research stated, "This study evaluated the surface characteristics of three nanoparticle resin composites (Z350, Heritage 7 Nanohybrid, and Ice) using profilometry and scanning electronic microscopy (SEM) after subjecting them to sequential finishing procedures using rigid rotary instruments. Fifteen 8 mm x 8 mm x 2 mm specimens were fabricated for each tested composite and subjected to one of the following finishing regimens: finishing with green stones followed by white stones, finishing with 45-mu m diamond followed by 15-mu m diamond, finishing with a 12-fluted carbide followed by a 20-fluted carbide."
The news correspondents obtained a quote from the research from Marquette University, "After finishing, the surfaces were subjected to profilometric testing. Eight parallel tracings were used to scan the finished surface of each specimen. For each recorded profile, the average roughness (R-a) and extreme value descriptor (R-max) were recorded. On completion of the profilometric testing, two specimens from each group were randomly selected for qualitative assessment by SEM. Profilometric data was analyzed using a one-way analysis of variance and post hoc Scheffe tests. The results demonstrated that the three control groups of the tested nanocomposites behaved as a coherent group with respect to surface roughness. With the exception of the nanohybrid Heritage 7 finished with the carbide instruments, all composites showed an increase in surface roughness. The Z350 and Ice finished with the carbide finishing instruments showed no statistically significant increase in R-a, but both of these composites showed significantly rougher surfaces when finished with diamonds compared with controls. The nanohybrids Ice and Heritage 7 demonstrated significantly higher roughness in terms of R. when finished with stones. The SEM correlated well with roughness measurements."
According to the news reporters, the research concluded: "The conclusion may be drawn that diamonds and stones produce unacceptable surfaces in terms of roughness on the tested nanocomposites whereas finishing carbides produce acceptable surfaces."
For more information on this research see: Surface Properties of Dental Nanocomposites After Finishing With Rigid Rotary Instruments. Operative Dentistry, 2013;38(5):519-527. Operative Dentistry can be contacted at: Operative Dentistry Inc, Indiana Univ School Dentistry, Room S411, 1121 West Michigan St, Indianapolis, IN 46202-5186, USA (see also Dentistry).
Our news journalists report that additional information may be obtained by contacting S.M. Marchan, Marquette University, Sch Dental, Dept. of Gen Dental Sci Dental Mat & Operat Dental, Milwaukee, WI 53233, United States. Additional authors for this research include D. White, Q.M. Marchan, V. Dhuru and W.A. Smith.
Keywords for this news article include: Milwaukee, Wisconsin, Dentistry, United States, North and Central America
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