A physico-chemical explanation of the post-polymerization shrinkage in dental resins

Truffier-Boutry, Delphine; Demoustier‐Champagne, Sophie; Devaux, Jacques; Biebuyck, Jean-Jacques; Mestdagh, Michèle; Larbanois, Philippe; Leloup, Gaëtane

doi:10.1016/j.dental.2005.04.030

Cited by 113 publications

(89 citation statements)

References 25 publications

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“…The phenomenon of "dark" post cure is in agreement with the findings of other authors [16,17], but is in contrast to conversion measurements performed by Raman spectroscopy, for which little increase in conversion within 24 h was reported [18,19]. Under wet conditions, the lower conversion in BPDM and IPDM composites is attributed to water absorbed in the composites, which may have poisoned the post-polymerization.…”

Section: Discussionsupporting

confidence: 91%

Degree of cure and fracture properties of experimental acid-resin modified composites under wet and dry conditions

López-Suevos

Dickens

2008

Dental Materials

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Objective-Evaluate the effects of core structure and storage conditions on the mechanical properties of acid-resin modified composites and a control material by three-point bending and conversion measurements 15 min and 24 h after curing.Methods-The monomers pyromellitic dimethacrylate (PMDM), biphenyldicarboxylic-acid dimethacrylate (BPDM), (isopropylidene-diphenoxy)bis(phthalic-acid) dimethacrylate (IPDM), oxydiphthalic-acid dimethacrylate (ODPDM), and Bis-GMA were mixed with triethyleneglycol dimethacrylate (TEGDMA) in a 40/60 molar ratio, and photo-activated. Composite bars (Bariumoxide-glass/resin = 3/1 mass ratio, (2 × 2 × 25) mm, n = 5) were light-cured for 1 min per side. Flexural strength (FS), elastic modulus (E), and work-of-fracture (WoF) were determined in threepoint bending after 15 min (stored dry); and after 24 h under dry and wet storage conditions at 37 °C . Corresponding degrees of conversion (DC) were evaluated by Fourier transform infrared spectroscopy. Data was statistically analyzed (2-way analysis of variance, ANOVA, Holm-Sidak, p < 0.05).Results-Post-curing significantly increased FS, E and DC in nearly all cases. WoF did not change, or even decreased with time. For all properties ANOVA found significant differences and interactions of time and material. Wet storage reduced the moduli and the other properties measured with the exception of FS and WoF of ODPDM; DC only decreased in BPDM and IPDM composites.Significance-Differences in core structure resulted in significantly different physical properties of the composites studied with two phenyl rings connected by one ether linkage as in ODPDM having superior FS, WoF and DC especially after 24 h under wet conditions. As expected, post-curing significantly contributed to the final mechanical properties of the composites, while wet storage generally reduced the mechanical properties.

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Section: Discussionsupporting

confidence: 91%

Degree of cure and fracture properties of experimental acid-resin modified composites under wet and dry conditions

López-Suevos

Dickens

2008

Dental Materials

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“…The DC is known to evolve up to about 24 h after irradiation [53]. Moreover, the temperature during polymerization can significantly affect polymerization efficiency, and a rise from room temperature (22˚C) to mouth temperature (35˚C) has been shown to result in increased DC due to improved monomer mobility [54].…”

Section: Discussionmentioning

confidence: 99%

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

et al. 2014

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OBJECTIVES To evaluate the influence of irradiation time on degree of conversion (DC) and microhardness of high-viscosity bulk-fill resin composites in depths up to 6 mm. MATERIALS AND METHODS Four bulk-fill materials (Tetric EvoCeram Bulk Fill-TECBF; x-tra fil-XF; QuixFil-QF; SonicFill-SF) and one conventional nano-hybrid resin composite (Tetric EvoCeram-TEC) were irradiated for 10, 20, or 30 s at 1,170 mW/cm(2). DC and Knoop microhardness (KHN) were recorded after 24-h dark storage at five depths: 0.1, 2, 4, 5, and 6 mm. Data were statistically analyzed using ANOVA and Bonferroni's post-hoc test ( = 0.05). RESULTS With increasing bulk thickness, DC and KHN significantly decreased for TEC. TECBF and SF showed a significant decrease in DC and KHN at 4-mm depth after 10-s irradiation, but no decrease in DC after 30-s irradiation (p > 0.05). XF and QF demonstrated no significant DC decrease at depths up to 6 mm after irradiation of at least 20 s. At 4-mm depth, all materials tested achieved at least 80 % of their maximum DC value, irrespective of irradiation time. However, at the same depth (4 mm), only XF and QF irradiated for 30 s achieved at least 80 % of their maximum KHN value. CONCLUSIONS Regarding DC, the tested bulk-fill resin composites can be safely used up to at least 4-mm incremental thickness. However, with respect to hardness, only XF and QF achieved acceptable results at 4-mm depth with 30 s of irradiation. CLINICAL RELEVANCE Minimum irradiation times stated by the manufacturers cannot be recommended for placement of highviscosity bulk-fill materials in 4-mm increments. Conclusions: Regarding DC, the tested bulk-fill resin composites can be safely used up to at least 4-mm incremental thickness. However, with respect to hardness, only XF and QF achieved acceptable results at 4-mm depth with 30 s of irradiation.Clinical relevance: Minimum irradiation times stated by the manufacturers cannot be recommended for placement of high-viscosity bulk-fill materials in 4-mm increments.

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“…This result further support these previous viewpoint that fast light polymerization can prevent the role of chemical polymerization of dual-cured resin luting agents. Truffier-Boutry et al [23] suggested that fast hardening of resin matrix monomers under light polymerization could trap a large excess of free radicals, and although these free radicals can come into "contact"…”

Section: Discussionmentioning

confidence: 99%

Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents

2008

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A physico-chemical explanation of the post-polymerization shrinkage in dental resins

Cited by 113 publications

References 25 publications

Degree of cure and fracture properties of experimental acid-resin modified composites under wet and dry conditions

Degree of cure and fracture properties of experimental acid-resin modified composites under wet and dry conditions

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents

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