Laboratory methods to simulate the mechanical degradation of resin composite restorations

Lima, Verônica P.; Machado, Jaqueline B.; Loomans, Bas; Moraes, Rafael R.

doi:10.1016/j.dental.2021.12.006

Cited by 19 publications

(12 citation statements)

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“…Most laboratory aging experiments are performed with the goal of understanding the performance and degradation mechanisms of RBCs in a clinical setting. Accelerated aging is often used to shorten the duration of an experiment and is frequently achieved by exposing samples to extremely harsh environments, usually mechanical and/or hydrothermal stress [ 17 ], high UV or visible light exposure [ 30 ], solvents with plasticizing effects [ 15 , 16 , 31 ] or biofilms [ 32 ]. As with artificial aging, the correlation of the results with behavior under clinical service conditions may not be straightforward.…”

Section: Discussionmentioning

confidence: 99%

“…When data from clinical studies are rare, one way to get closer to the clinical performance of a material is to subject it to artificial aging. This is either immersion in different media, mostly distilled water and artificial saliva [ 15 , 16 ], or additional thermal, mechanical, and biological aging [ 16 , 17 ]. The shortcoming here is that none of these methods are standardized and a correlation with clinical performance to assess whether the aging method can efficiently mimic clinical behavior has rarely been systematically performed.…”

Section: Introductionmentioning

confidence: 99%

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Accelerated versus Slow In Vitro Aging Methods and Their Impact on Universal Chromatic, Urethane-Based Composites

Ilie

2023

Materials

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Structural coloring of dental resin-based composites (RBC) is used to create universal chromatic materials designed to meet any aesthetic need, replacing the mixing and matching of multiple shades. The microstructural adjustments to create this desideratum involve nanoscale organic–inorganic core–shell structures with a particular arrangement. The generally higher polymer content associated with these structures compared to universal chromatic RBCs colored by pigments, which in their microstructure come close to regularly shaded RBCs, can influence the way the material ages. Accelerated and slow aging up to 1.2 years of immersion in artificial saliva at 37 °C were therefore compared in relation to their effects on the materials described above and in relation to the immersion conditions prescribed by standards. Quasi-static and viscoelastic parameters were assessed to quantify these effects by a depth-sensing indentation test equipped with a DMA module. The microstructure of the materials was characterized by scanning electron microscopy. The results convincingly show a differentiated influence of the aging protocol on the measured properties, which was more sensitively reflected in the viscoelastic behavior. Accelerated aging, previously associated with the clinical behavior of RBCs, shows a 2- to 10-fold greater effect compared to slow aging in artificial saliva of up to 1.2 years, highly dependent on the microstructure of the material.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accelerated versus Slow In Vitro Aging Methods and Their Impact on Universal Chromatic, Urethane-Based Composites

Ilie

2023

Materials

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“…In addition, another important factor to be noted is that the etiology of the tooth wear for the studies included in this review could be divided mainly into two types: chemical and mechanical. Although none of the studies offered a comparison in the outcomes of the restorations according to the specific etiology, it should be recognized that different restorative materials do not have the same performance under different pH and mechanical challenges [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

Treatment of Tooth Wear Using Direct or Indirect Restorations: A Systematic Review of Clinical Studies

et al. 2022

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Tooth wear is considered a well-developed issue in daily clinical practice; however, there is no standard protocol for treatment. The aim of this manuscript was to systematically review the literature to evaluate the clinical outcomes of direct or indirect restorations for treating tooth wear. A literature search was conducted through the PubMed MedLine, Scopus, ISI Web of Science, Scielo, and EMBASE databases up to 29 April 2022. Clinical studies evaluating the clinical performance of direct or indirect restorations for treating tooth wear for a minimum follow-up of 6 months were included in the review. A total of 2776 records were obtained from the search databases. After full-text reading, 16 studies were included in the qualitative analysis. Considering the high heterogenicity of the studies included, a meta-analysis could not be performed. All studies included the rehabilitation of anterior and posterior teeth with extensive wear, using both indirect and direct restorations for a maximum follow-up of 10 years. Restoration materials included ceramo-metal crowns, full gold crowns, lithium disilicate ceramic, zirconia, polymer infiltrated ceramic networks, and resin composites. Most of the reports assessed the survival rate of the restorations and the clinical features using the United States Public Health Service (USPHS) Evaluation System criteria. Contradictory discoveries were perceived concerning the type of restoration with better clinical performance. Considering the current literature available, there is no evidence in the superiority of any restoration technique to ensure the highest clinical performance for treating tooth wear.

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“…Composite resins provide excellent restoration properties such as increased wear resistance 8 . However, acidic conditions can damage the physical and mechanical properties of these materials, leading to the degradation of the organic matrix and the exposure of inorganic filaments, changing the properties of resins reducing the durability of restorations 9 .…”

Section: Introductionmentioning

confidence: 99%

Changes in the properties of bulk-fill resins under conditions of gastroesophageal reflux and bulimia

Arnez,

Dotta,

Almeida

et al. 2023

Braz. J. Oral Sci.

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Aim: Evaluate the roughness, microhardness and color change of different Bulk Fill resins when submitted to the condition of gastroesophageal reflux and bulimia. Methods: 60 specimens (n = 10) of Bulk-Fill composite resins were made: M1 – Filtek™; M2 – Tetric N-Ceram and M3 – OPUS, through a matrix 2x6 mm and light cured by the VALO light source. After polishing, initial analyzes (48 hours - T0) of surface roughness (Ra), microhardness (VHN) and color change (ΔE) were performed. To simulate the oral condition of severe gastroesophageal reflux and bulimia, the specimens were immersed in hydrochloric acid (S1) (pH 1.7) 4 minutes a day, for 7 days. Control group specimens were immersed in artificial saliva (S2). Subsequently to immersions, mechanical brushing was performed for 3 minutes, three times a day, simulating 7 days of brushing. And again, the analyzes of Ra, VHN and ΔE were performed (7 days - T1). Thus, hydrochloric acid immersion, mechanical brushing and Ra analysis were repeated at 14 days (T2) and 21 days (T3); and T2, T3 and T4 (3 years) for VHN and ΔE. Results: After Shapiro-Wilk statistical test, ANOVA and Tukey test with Bonferroni adjustment (p>0.05), M3 showed the lowest Ra at all times compared to the other resins, while the highest Ra was at T0. M1 and T1 showed higher VHN. And M2 and T4 showed higher ΔE. Conclusion: Bulk Fill resins can be indicated for patients with Gastroesophageal Reflux and Bulimia, nonetheless, Tetric N-Ceram resin showed the worst results.

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Laboratory methods to simulate the mechanical degradation of resin composite restorations

Cited by 19 publications

References 100 publications

Accelerated versus Slow In Vitro Aging Methods and Their Impact on Universal Chromatic, Urethane-Based Composites

Accelerated versus Slow In Vitro Aging Methods and Their Impact on Universal Chromatic, Urethane-Based Composites

Treatment of Tooth Wear Using Direct or Indirect Restorations: A Systematic Review of Clinical Studies

Changes in the properties of bulk-fill resins under conditions of gastroesophageal reflux and bulimia

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