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. 2014 Nov;39(4):310-8.
doi: 10.5395/rde.2014.39.4.310. Epub 2014 Sep 5.

The effect of resin thickness on polymerization characteristics of silorane-based composite resin

Sung-Ae Son  1 , Hyoung-Mee Roh  1 , Bock Hur  1 , Yong-Hoon Kwon  2 , Jeong-Kil Park  1
Affiliations

The effect of resin thickness on polymerization characteristics of silorane-based composite resin

Sung-Ae Son et al. Restor Dent Endod. 2014 Nov.

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.

Keywords: Polymerization; Resin thickness; Silorane-based composite resin.

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Conflict of interest statement

No potential conflict of interest relevant to this article was reported.

Figures

Figure 1
Figure 1
Correlation between the degree of conversion and Vickers microhardness values for different depths.
Figure 2
Figure 2
Correlation between the degree of conversion and refractive index values for different depths.
Figure 3
Figure 3
Correlation between the Vickers microhardness and refractive index values for different depths and resin products.
See this image and copyright information in PMC

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