Influence of curing modes on conversion and shrinkage of dual-cure resin-cements

Aldhafyan, Mohammed; Silikas, Nick; Watts, D.C.

doi:10.1016/j.dental.2021.12.004

Cited by 27 publications

(28 citation statements)

References 36 publications

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“…The distinct behavior of Cention in the self-cured and light-cured mode likely originated from different polymerization kinetics and resulting polymer networks. While the polymerization rate is the highest during light irradiation for the light-cured composites, redox polymerization in the self-curing modality has a delayed onset [38]. Ilie showed that initiation of polymerization of Cention N (hand-mixed) in a self-cure mode is lagging for 3.5 min after hand mixing, and that 11 min is needed to attain the same degree of conversion as in the light-cured mode [33].…”

Section: Discussionmentioning

confidence: 99%

Long-Term Assessment of Contemporary Ion-Releasing Restorative Dental Materials

Marović

Par

Posavec³

et al. 2022

Materials

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The objective was to evaluate new commercially available ion-releasing restorative materials and compare them to established anti-cariogenic materials. Four materials were tested: alkasite Cention (Ivoclar Vivadent) in self-cure or light-cure mode, giomer Beautifil II (Shofu), conventional glass-ionomer Fuji IX (GC), and resin composite Tetric EvoCeram (Ivoclar Vivadent) as a control. Flexural strength, flexural modulus, and Weibull modulus were measured one day, three months, and after three months with accelerated aging in ethanol. Water sorption and solubility were evaluated for up to one year. Degree of conversion was measured during 120 min for self-cured and light-cured Cention. In this study, Beautifil II was the ion-releasing material with the highest flexural strength and modulus and with the best resistance to aging. Alkasite Cention showed superior mechanical properties to Fuji IX. Weibull analysis showed that the glass-ionomer had the least reliable distribution of mechanical properties with the highest water sorption. The solubility of self-cured alkasite exceeded the permissible values according to ISO 4049. Degree of conversion of light-cured Cention was higher than in self-cure mode. The use of alkasite Cention is recommended only in the light-cure mode.

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Section: Discussionmentioning

confidence: 99%

Long-Term Assessment of Contemporary Ion-Releasing Restorative Dental Materials

Marović

Par

Posavec³

et al. 2022

Materials

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“…The concerns of released monomers included cytotoxic, teratogenic, estrogenic, mutagenic, genotoxic effects, and allergic reactions depending upon the released substances [ 54 ]. Additionally, it was demonstrated that monomers released from resin composites might interfere with biofilm metabolism, leading to biofilm dysbiosis or an increase in cariogenicity [ 31 ]. This may subsequently enhance the risk of caries formation around the composites.…”

Section: Discussionmentioning

confidence: 99%

“…The flexural strength recorded from the commercial material in the current study was higher than that reported in the previous studies [ 70 , 71 ]. The specimens in the current study were allowed for post-polymerization after light curing for 24 h prior to the immersion for another 24 h. The previous study showed that the DC of dual-cured resin composites activated by light-curing or self-curing modes was increased by ~10% at 24 h [ 31 ]. The continuation of polymerization may potentially enhance the cross-linking and mechanical strength of the material [ 33 , 62 ].…”

Section: Discussionmentioning

confidence: 99%

“…The decrease in monomer conversion could affect polymer rigidity and promote water sorption leading to polymer expansion [ 27 ]. This may subsequently lead to the reduction of strength [ 28 ], poor color stability [ 29 ], hydrolytic degradation [ 30 ], and monomer elution [ 31 ]. Furthermore, the reactive fillers were not silanized, which may affect the stress transfer within the resin matrix and increase the risk of filler degradation, thus decreasing the mechanical strength of the materials [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…The main concern for resin-based materials is the excessive shrinkage stress generated during polymerization. Additionally, the continuation of polymerization of dual-cured resin composites by chemical-activated polymerization resulted in post-gel shrinkage in the materials [ 31 , 33 ]. It was reported that hygroscopic expansion due to water sorption could compensate for the polymerization shrinkage and reduce the shrinkage stress of the composites [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Sr/F-Bioactive Glass Nanoparticles and Calcium Phosphate on Monomer Conversion, Biaxial Flexural Strength, Surface Microhardness, Mass/Volume Changes, and Color Stability of Dual-Cured Dental Composites for Core Build-Up Materials

et al. 2022

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This study prepared composites for core build-up containing Sr/F bioactive glass nanoparticles (Sr/F-BGNPs) and monocalcium phosphate monohydrate (MCPM) to prevent dental caries. The effect of the additives on the physical/mechanical properties of the materials was examined. Dual-cured resin composites were prepared using dimethacrylate monomers with added Sr/F-BGNPs (5 or 10 wt%) and MCPM (3 or 6 wt%). The additives reduced the light-activated monomer conversion by ~10%, but their effect on the conversion upon self-curing was negligible. The conversions of light-curing or self-curing polymerization of the experimental materials were greater than that of the commercial material. The additives reduced biaxial flexural strength (191 to 155 MPa), modulus (4.4 to 3.3), and surface microhardness (53 to 45 VHN). These values were comparable to that of the commercial material or within the acceptable range of the standard. The changes in the experimental composites’ mass and volume (~1%) were similar to that of the commercial comparison. The color change of the commercial material (1.0) was lower than that of the experimental composites (1.5–5.8). The addition of Sr/F-BGNPs and MCPM negatively affected the physical/mechanical properties of the composites, but the results were satisfactory except for color stability.

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The impact of inorganic fillers, organic content, and polymerization mode on the degree of conversion of monomers in resin-matrix cements for restorative dentistry: a scoping review

Santos,

Fidalgo-Pereira,

Torres

et al. 2024

Clin Oral Invest

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Purpose The main aim of the present study was to carry out a scoping review on the differences in degree of conversion of monomers regarding several types resin cements, indirect restorative materials, and light-curing procedures used in dentistry. Method A bibliographic review was performed on PubMed using the following search items: “degree of conversion” OR “filler” AND “resin cement” OR “inorganic cement” AND “organic” OR “radiopacity” OR “refractive” OR “transmittance” OR “type” AND “resin composite.” The search involved articles published in English language within the last thirteen years. A research question has been formulated following the PICO approach as follow: “How different is the degree of conversion of monomers comparing several types of resin-matrix cements?”. Results Within the 15 selected studies, 8 studies reported a high degree of conversion (DC) of the organic matrix ranging from 70 up to 90% while 7 studies showed lower DC values. Dual-cured resin-matrix cements revealed the highest mean values of DC, flexural strength, and hardness when compared with light- and self-polymerized ones. DC mean values of resin-matrix cements light-cured through a ceramic veneer with 0.4 mm thickness were higher (~ 83%) than those recorded for resin-matrix cements light-cured through a thicker ceramic layer of 1.5 mm (~ 77%). Conclusions The highest percentage of degree of conversion of monomers was reported for dual-cured resin-matrix cements and therefore both chemical and light-induced pathways promoted an enhanced polymerization of the material. Similar degree of conversion of the same resin-matrix cement were recorded when the prosthetic structure showed a low thickness. On thick prosthetic structures, translucent materials are required to allow the light transmission achieving the resin-matrix cement. Clinical relevance The chemical composition of resin-matrix cements and the light-curing mode can affect the polymerization of the organic matrix. Thus, physical properties of the materials can vary leading to early clinical failures at restorative interfaces. Thus, the analysis of the polymerization pathways of resin-matrix cements is significantly beneficial for the clinical performance of the restorative interfaces.

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Influence of curing modes on conversion and shrinkage of dual-cure resin-cements

Cited by 27 publications

References 36 publications

Long-Term Assessment of Contemporary Ion-Releasing Restorative Dental Materials

Long-Term Assessment of Contemporary Ion-Releasing Restorative Dental Materials

Effects of Sr/F-Bioactive Glass Nanoparticles and Calcium Phosphate on Monomer Conversion, Biaxial Flexural Strength, Surface Microhardness, Mass/Volume Changes, and Color Stability of Dual-Cured Dental Composites for Core Build-Up Materials

The impact of inorganic fillers, organic content, and polymerization mode on the degree of conversion of monomers in resin-matrix cements for restorative dentistry: a scoping review

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