The effect of resin thickness on polymerization characteristics of silorane-based composite resin
손성애, 노형미, Hur Bock, 권용훈, 박정길,
소속 상세정보
손성애 ( Son Sung-Ae ) - Pusan National University School of Dentistry Department of Conservative Dentistry
노형미 ( Roh Hyoung-Mee ) - Pusan National University School of Dentistry Department of Conservative Dentistry
( Hur Bock ) - Pusan National University School of Dentistry Department of Conservative Dentistry
권용훈 ( Kwon Yong-Hoon ) - Pusan National University School of Dentistry Department of Dental Materials
박정길 ( Park Jeong-Kil ) - Pusan National University School of Dentistry Department of Conservative Dentistry
KMID : 1034420140390040310
Abstract
Objectives: This study examined the influence of the resin thickness on the polymerization of silorane- and methacrylate-based composites.
Materials and Methods: One silorane-based (Filtek P90, 3M ESPE) and two methacrylate-based (Filtek Z250 and Z350, 3M ESPE) composite resins were used. The number of photons were detected using a photodiode detector at the different thicknesses (thickness, 1, 2 and 3 mm) specimens. The microhardness of the top and bottom surfaces was measured (n = 15) using a Vickers hardness with 200 gf load and 15 sec dwell time conditions. The degree of conversion (DC) of the specimens was determined using Fourier transform infrared spectroscopy (FTIR). Scratched powder of each top and bottom surface of the specimen dissolved in ethanol for transmission FTIR spectroscopy. The refractive index was measured using a Abbe-type refractometer. To measure the polymerization shrinkage, a linometer was used. The results were analyzed using two-way ANOVA and Tukey's test at p < 0.05 level.
Results: The silorane-based resin composite showed the lowest filler content and light attenuation among the specimens. P90 showed the highest values in the DC and the lowest microhardness at all depth. In the polymerization shrinkage, P90 showed a significantly lower shrinkage than the rest two resin products (p < 0.05). P90 showed a significantly lower refractive index than the remaining two resin products (p < 0.05).
Conclusions: DC, microhardness, polymerization rate and refractive index linearly decreased as specimen thickness linearly increased. P90 showed much less polymerization shrinkage compared to other specimens. P90, even though achieved the highest DC, showed the lowest microhardness and refractive index.
키워드
Polymerization; Resin thickness; Silorane-based composite resin
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