Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment

Szczesio-Włodarczyk, Agata; Sokołowski, Jerzy; Kleczewska, Joanna; Bociong, Kinga

doi:10.3390/polym12040882

Cited by 114 publications

(108 citation statements)

References 146 publications

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“…The hydrolysis process of methacrylates is slow in neutral conditions, such as the distilled water used in our study. However, it needs to be considered because as the structure is gradually degraded and swelled with water sorption, unreacted monomers and degradation byproducts diffuse out more easily [ 35 ]. Another factor that should be taken into account is the polymerization rate, which is related to the concentration of residual monomers.…”

Section: Discussionmentioning

confidence: 99%

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

et al. 2021

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The purpose of this study was to examine and compare color and translucency stability of three-dimensional (3D) printable dental materials for crown and bridge restorations. Five different materials were investigated, and twelve disc-shaped specimens of two different thicknesses (1 and 2 mm) were prepared using a digital light processing 3D printer. Color measurements were made according to the CIELAB color scale (L*, a*, and b*) using a spectrophotometer 1 h, 1 day, 1 week, one month, and six months after post-curing of the materials, and the translucency parameter (TP) was calculated. The L*, a*, b*, and TP values were compared among the different materials and storage periods using repeated measures analysis of variance. Color and translucency changes of the specimens after the different storage periods were compared with 1 h measurements to determine whether they exceeded clinically perceivable thresholds. The L*, a*, b*, and TP values showed significant differences according to the storage periods, as well as among the materials. Until one month, some materials demonstrated distinct color differences, while others showed small color differences below a clinically perceivable threshold. The translucency differences were not clinically perceivable for any specimen. After six months, all specimens demonstrated large color changes, whereas the changes in translucency were relatively small. In conclusion, the color of 3D printable dental materials changed with time, and the differences varied with the materials used. On the contrary, the changes in translucency were small. Overall, the materials became darker, more yellowish, and more opaque after six months of water storage.

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Section: Discussionmentioning

confidence: 99%

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

et al. 2021

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“…Saliva is a more aggressive environment than water itself, with the resin demonstrating higher levels of sorption in saliva than in water alone. Additionally, the conditions of the oral cavity environment can accelerate the hydrolysis of the dental material [ 34 ], and saliva contamination has shown to be detrimental to adhesive bonding. Despite this, saliva contamination has not been found to influence the properties of composite materials with regard to their degree of conversion or microhardness [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

The Influence of Cement Layer Thickness on the Stress State of Metal Inlay Restorations—Photoelastic Analysis

et al. 2021

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The successful restoration of teeth requires a good connection between the inlay and natural tissue. A strong bond may improve retention and reinforce tooth structure. The purpose of this study was to evaluate the influence of cement layer thickness on contraction stress generated during photopolymerization, and to determine the changes in stress state of the cement occurring during aging in water (over 84 days). Two cements were used: resin composite cement (NX3) and self-adhesive resin cement (Maxcem Elite Chroma). A cylindrical sample made of CuZn alloy was used to imitate the inlay. The stress state was measured by photoelastic analysis. The contraction stress of the inlay restoration was calculated for cement layer thicknesses of 25 µm, 100 µm, 200 µm, and 400 µm. For both tested materials, the lowest contraction stress was observed for the thinnest layer (25 µm), and this increased with thickness. Following water immersion, a significant reduction in contraction stress was observed due to hygroscopic expansion. Applying a thin layer (approximately 25 µm) of composite and self-adhesive resin cements resulted in high levels of expansion stresses (over −6 MPa) after water aging.

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“…The two main components are coupled with each other by silane coupling agent. (1,2) The decrease in C=C double bond, (3,4) the increase in water sorption, hydrolytic degradation, and release of the free monomers, (5,6) could be the consequences of the aging process of resin composite.…”

Section: Introductionmentioning

confidence: 99%

Repair Durability of a Water-Aged Microfine Hybrid Restorative Resin Composite: A Nano-Leakage Study

El-Tahtawi

Laithy

Soliman

et al. 2021

Egyptian Dental Journal

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Aim: To evaluate the effect of using two types of flowable resin composites and storage time on nano-leakage of repaired water aged resin composite. Materials and Methods: In total, 30 resin composite discs were prepared and stored in distilled water for 6 m. The discs were then randomly divided into 6 experimental groups (n=5/group) according to the two experimental factors of the study: Factor 1: Flowable composite, 3 groups (no-flowable, high-viscosity and low-viscosity flowable composites), and Factor 2; Storage time after repair, 2 groups (24 h and 6 m). Repair procedures were carried out using universal adhesive with and without the application of the flowable composite. After repair, half of the specimens were stored for 24 h and the other half were stored for 6 m in distilled water. After the recommended storage time, each disc was sectioned into 2 halves and each half was prepared for silver nitrate staining procedures to evaluate the nano-leakage under SEM. Three photomicrographs were taken for each half-slab, resulting in 30 photomicrographs/group, which were analyzed using ImageJ software. Data were evaluated using Kruskal-Wallis/Mann-Whitney test (P=0.05). Results: The use of flowable composite had no significant effect on nano-leakage (P=0.129), while storage time showed a statistically significant effect on nano-leakage (P < 0.0001). There was no statistically significant difference regarding the use of flowable resin composite either at 24 h or 6 m storage times (P > 0.05). There was a statistically significant difference between 24 h and 6 m storage periods for all experimental variables (P < 0.05). Conclusion: The two types of flowable composites were not able to prevent the uptake of silver nitrate at the composite/composite interface either after 24 h or 6 m.

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Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment

Cited by 114 publications

References 146 publications

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

The Influence of Cement Layer Thickness on the Stress State of Metal Inlay Restorations—Photoelastic Analysis

Repair Durability of a Water-Aged Microfine Hybrid Restorative Resin Composite: A Nano-Leakage Study

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