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. 2017 Feb 14;9(Suppl 1-2016 to N 4-2016):71-79.
doi: 10.11138/orl/2016.9.1S.071. eCollection 2016 Jan-Mar.

Polymerization shrinkage and spherical glass mega fillers: effects on cuspal deflection

M Andreasi Bassi  1 , S Serra  1 , C Andrisani  2 , S Lico  3 , L Baggi  4 , D Lauritano  5
Affiliations

Polymerization shrinkage and spherical glass mega fillers: effects on cuspal deflection

M Andreasi Bassi et al. Oral Implantol (Rome). .

Abstract

Purpose: The Authors analyzed the effect of spherical glass mega fillers (SGMF) on reducing contraction stress in dental composite resins, by means of a cavity model simulating the cuspal deflection which occurs on filled tooth cavity walls in clinical condition.

Materials and methods: 20 stylized MOD cavities (C-factor = 0.83) were performed in acrylic resin. The inner surface of each cavity was sand blasted and adhesively treated in order to ensure a valid bond with the composite resin. Three different diameter of SGMF were used (i.e. 1, 1,5, 2 mm). The samples were divided in 4 groups of 5 each: Group 1 samples filled with the composite only; Group 2 samples filled with composite added with SGMFs, Ø1mm (16 spheres for each sample); Group 3 samples filled with composite added with SGMFs, Ø1,5 mm (5 spheres for each sample); Group 4 samples filled with composite added with SGMFs, Ø2 mm (2 spheres for each sample). Digital pictures were taken, in standardized settings, before and immediately after the polymerization of the composite material, placed into the cavities. With a digital image analysis software the distances from the coronal reference points of the cavity walls were measured. Then the difference between the first and second measurement was calculated. The data were analyzed by means of the ANOVA test.

Results: A significative reduction on cavity walls deflection, when the composite resin is used in addiction with the SGMFs was observed. The SGMFs of smallest diameter (1mm) showed the better outcome.

Conclusion: The SGMFs are reliable in reducing contraction stress in dental composite resins.

Keywords: composite fillers; composite shrinkage; cuspal deflection; elastic modulus; enamel cracks; polymerization shrinkage; spherical glass mega fillers.

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Figures

Figure 1
Figure 1
a) The spherical glass mega fillers (SGMFs), in the 3 available diameters; b) the 4 groups of samples of 5 each; c–f) samples, before (left) and after (right) the polymerization, for each group analyzed.
Figure 2
Figure 2
For each sample, the distances from the coronal reference points of the cavity walls were measured before (a) and immediately after (b) the polymerization, by means of a digital image analysis software.
See this image and copyright information in PMC

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