Polymerization shrinkage: effects of boundary conditions and filling technique of resin composite restorations

Loguércio, Alessandro Dourado; Reis, Alessandra; Schroeder, M.; Balducci, Ivan; Versluis, Antheunis; Ballester, Rafael Yagüe

doi:10.1016/j.jdent.2004.02.010

Cited by 59 publications

(43 citation statements)

References 19 publications

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“…Its effects are related to marginal gap formation by interface debonding, microcracking, or fracture of the thin surrounding walls of the dental preparations. [4][5][6][7] Considerable effort has been invested in minimizing shrinkage in order to reduce the stress that stems from polymerization of composite materials. Different strategies are used to reduce polymerization shrinkage: changing the monomeric matrix or increasing the filler load.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Water Sorption, Solubility, and Roughness of Silorane- and Methacrylate-based Composite Resins

Giannini

Francescantonio

Pacheco

et al. 2014

Operative Dentistry

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This study showed that silorane-based composites demonstrated acceptable performance in all parameters studied (water sorption, solubility, and roughness), supporting their use as an alternative restorative material. SUMMARYObjective: The objective of this study was to evaluate the surface roughness (SR), water sorption (WS), and solubility (SO) of four composite resins after finishing/polishing and after one year of water storage. ; and Astropol F, P, HP, Ivoclar Vivadent) were used according to the manufacturers' instructions. Ten disc-shaped specimens of each composite resin were made for each evaluation. Polished surfaces were analyzed using a profilometer after 24 hours and one year. For the WS and SO, the discs were stored in desiccators until constant mass was achieved. Specimens were then stored in water for seven days or one year, at which time the mass of each specimen was measured. The specimens were dried again and dried specimen mass determined. The WS and SO were calculated from these measurements. Data were analyzed by two-way analysis of variance and Tukey post hoc test (a=0.05).Results: Filtek Silorane showed the lowest SR, WS, and SO means. Water storage for one year increased the WS means for all composite resins tested.

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Section: Introductionmentioning

confidence: 99%

Characterization of Water Sorption, Solubility, and Roughness of Silorane- and Methacrylate-based Composite Resins

Giannini

Francescantonio

Pacheco

et al. 2014

Operative Dentistry

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“…9 Not all polymerization shrinkage occurs immediately after light activation. 20 Our results showed that stress increased at 24 hours and remained constant at 7 days for all composites except Silorane. The contraction observed after the light source was removed may be attributed to progressive cross-linking reactions that occur after photoactivation was concluded (post-cure), and to thermal contraction due to loss of radiant heat.…”

Section: Discussionmentioning

confidence: 49%

Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress

et al. 2012

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We compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Composites were divided into five groups: two commercial composites (Filtek Silorane and Filtek Z250) and three experimental composites with CQ/amine, CQ/PPD/amine, and PPD/amine. Composites were photopolymerized inside cavities, and subjected to photoelastic analysis immediately and at 24 hours and 7 days later using a plane polariscope. Stress created by Silorane (3.08 ± 0.09 MPa) was similar to that of Z250 (3.19 ± 0.13 MPa) immediately after photopolymerization (p > 0.05). After 24 hours and 7 days, Z250 (3.53 ± 0.15 and 3.69 ± 0.10 MPa, respectively) showed higher stress than Silorane (3.19 ± 0.10 and 3.16 ± 0.10 MPa, respectively). Qualitative analysis immediately after photopolymerization showed composite/CQ promoted higher stress than PPD, but stress levels at other evaluated times were statistically similar, varying between 3.45 ± 0.11 MPa and 3.92 ± 0.13 MPa. At 24 hours and 7 days, Silorane created the lowest stress. All photoinitiators created comparable tensions during polymerization.

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“…Despite the polymerization shrinkage, in the current composite resins, has been significantly reduced through the increase of the inorganic load the stress, induced on surrounding adherent dental structures, remains too high to allow to a direct filling to be used in large restorations of the posterior sectors (3)(4)(5)(6). Several methods have been proposed in recent years to reduce shrinkage stress through the modification of both the photo-activation protocols and the composite resins stratification techniques with encouraging results but inconclusive (7)(8)(9). Also from the commodity-related point of view advances have been made, for instance, a new monomer, the silorane, has been recently introduced.…”

Section: Introductionmentioning

confidence: 99%

Polymerization Shrinkage and Spherical Glass Mega Fillers: Effects on Cuspal Deflection

Bassi¹,

Serra²,

Andrisani³

et al. 2016

ORL

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SUMMARYPurpose. 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.

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Polymerization shrinkage: effects of boundary conditions and filling technique of resin composite restorations

Cited by 59 publications

References 19 publications

Characterization of Water Sorption, Solubility, and Roughness of Silorane- and Methacrylate-based Composite Resins

Characterization of Water Sorption, Solubility, and Roughness of Silorane- and Methacrylate-based Composite Resins

Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress

Polymerization Shrinkage and Spherical Glass Mega Fillers: Effects on Cuspal Deflection

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