Assessment of microhardness and color stability of micro-hybrid and nano-filled composite resins

Barve, Dipti; Dave, P; Gulve, Meenal; Saquib, Shahabe Abullais; Das, Gautam; Sibghatullah, Muhammad; Chaturvedi, Saurabh

doi:10.4103/njcp.njcp_632_20

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…Microhardness is one of the most significant factors that should be taken into account when assessing the mechanical characteristics of dental materials. Low surface microhardness values are significantly correlated with inadequate wear resistance and a propensity for scratching, both of which can impair fatigue strength and result in the failure of tooth restorations [17,18]. In our study, RMCIS, which had the lowest microhardness level at the beginning of the experiment, changed from having the lowest microhardness level to having the highest microhardness level at the conclusion of the gastric acid cycle.…”

Section: Discussionmentioning

confidence: 55%

The effects of gastric acid on pediatric restorative materials: SEM analysis

2023

Journal of Clinical Pediatric Dentistry

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In this study, we aimed to demonstrate changes in the surface roughness and microhardness of three different restorative materials routinely used in pediatric dentistry (composite, compomer and resin-modified glass ionomer cement (RMCIS)) in response to continuous daily exposure to gastric acid. Twelve samples of each of type of restorative material were prepared. Eleven of the specimens were included in the gastric acid cycle. The microhardness and surface roughness of ten samples were measured before and after the cycle. Another sample included in the cycle was compared with the sample not included in the cycle by scanning electron microscopy (SEM). There was a significant difference between the groups in terms of roughness scores following gastric acid cycle (p = 0.039). RMCIS material possessed the highest roughness value. A significant difference was identified in terms of microhardness levels before and after the gastric acid cycle (p = 0.001). The most significant change was observed in the compomer material. SEM analysis, performed after the gastric acid cycle, revealed that most cracks were identified in RMCIS material; this was followed by compomer and composite materials, respectively. Our analysis indicates that the restorative materials used frequently in pediatric dental procedures, show increased surface roughness and reduced microhardness when exposed to gastric acid.

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Section: Discussionmentioning

confidence: 55%

The effects of gastric acid on pediatric restorative materials: SEM analysis

2023

Journal of Clinical Pediatric Dentistry

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“…In another studies there was no significant difference between microhybrid and nanohybrid composite resins' color stability after staining and bleaching. Such a discrepancy between the results might be attributed to the protocol of the study like different soloutions, bleaching gels, hydrogen peroxide concentration and so forth [7,12,28].…”

Section: Discussionmentioning

confidence: 91%

Effect of Laser and Conventional Office Bleaching and Polishing on the Color Change of Stained Nanohybrid and Microhybrid Composite Resin

Farahani,

Faghihi,

Ranjbar Omrani

et al. 2023

International Journal of Dentistry

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Aim. The present study investigated the effects of laser and conventional in-office bleaching, and polishing on the color of stained composite resin. Materials and Methods. A microhybrid composite (Clearfil AP-X) and a nanohybrid composite (Grandio) were selected. Twenty-four discs (2 × 10 mm) for each composite were prepared. The samples were immersed in coffee solution (25 g of coffee in 250 mL water) for seven days. Then the samples were divided into three groups (n = 8) and the stains were removed using bleaching (with Opalescence Xtra Boost), diode laser irradiation with Heydent material and a Sof-Lex polishing kit. The L ∗ a ∗ b ∗ color parameters were determined using a spectrophotometer before and after immersion and after stain removal procedures, and the overall color changes (ΔE) were calculated. The data were analyzed with two-way analysis of variance. Results. In the Clearfil composite resin group, the mean ΔE compared to the baseline using in-office bleaching, laser irradiation, and Sof-Lex polishing kit were 3.31, 3.35, and 4.93, respectively. These values with the Grandio composite resin were 3.31, 6.35, and 4.57, respectively. The highest capacity to remove stains was related to the conventional in-office bleaching method. Grandio composite resin underwent more color changes than Clearfil composite resin significantly (P-value < 0.05). Conclusion. Both composite resins exhibited color changes after immersion in the discoloring solution. However, after staining-removing procedures, the ΔE values decreased. Decreases in the ΔE values were not sufficient to restore the color to that before immersion in the discoloring solution with any stain-removing methods.

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“…The color change in the resin composite samples used may also be associated with the different compositions as they differ in their chemical formulations [ 5 , 6 , 25 , 26 ]. The presence of triethylene glycol-dimethacrylate (TEGDMA) within the resin composite composition can lead to increased water absorption and staining rates, causing the adsorbed water to induce hydrolytic degradation or detachment of the filler matrix [ 1 , 27 , 28 ]. Zhang et al [ 23 ] reported that water absorption of polymers can cause softening of the resin composite matrix components, thus, reducing the resistance to discoloration.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Color Stability Evaluation of Three Polished and Unpolished Nanohybrid Resin Composites Immersed in a 0.12% Chlorhexidine-Based Mouthwash at Different Times

et al. 2023

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The use of chlorhexidine-based mouthwashes on resin composites with rough surfaces can cause discoloration which compromises the esthetic of patients. The present study aimed to evaluate the in vitro color stability of Forma (Ultradent Products, Inc., South Jordan), Tetric N-Ceram (Ivoclar Vivadent, Schaan, Liechtenstein) and Filtek Z350XT (3M, ESPE, St. Paul, MN, USA) resin composites, with and without polishing, after being immersed in a 0.12% chlorhexidine (CHX)-based mouthwash at different times. The present in vitro experimental and longitudinal study used 96 nanohybrid resin composite blocks (Forma, Tetric N-Ceram and Filtek Z350XT) 8 mm in diameter and 2 mm thick, evenly distributed. Each resin composite group was divided into two subgroups (n = 16) with and without polishing and then immersed in a 0.12% CHX-based mouthwash for 7, 14, 21 and 28 days. Color measurements were performed with a calibrated digital spectrophotometer. Nonparametric tests were used to compare independent (Mann–Whitney U and Kruskal–Wallis) and related (Friedman) measures. In addition, the Bonferroni post hoc correction was used considering a significance level of p < 0.05. All polished and unpolished resin composites presented color variation < 3.3 when immersed for up to 14 days in 0.12% CHX-based mouthwash. The polished resin composite with the lowest color variation (ΔE) values over time was Forma, and the one with the highest values was Tetric N-Ceram. When comparing the color variation (ΔE) over time, it was observed that the three resin composites, with and without polishing, presented a significant change (p < 0.001), although these changes in color variation (ΔE) were evident from 14 days between each color acquisition (p < 0.05). The unpolished Forma and Filtek Z350XT resin composites showed significantly more color variation than the same polished ones at all times when immersed in a 0.12% CHX-based mouthwash for 30 s daily. In addition, every 14 days, all three resin composites with and without polishing showed a significant color change, while, every 7 days, color stability was maintained. All the resin composites showed clinically acceptable color stability when exposed for up to 14 days to the above-mentioned mouthwash.

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Assessment of microhardness and color stability of micro-hybrid and nano-filled composite resins

Cited by 10 publications

References 22 publications

The effects of gastric acid on pediatric restorative materials: SEM analysis

The effects of gastric acid on pediatric restorative materials: SEM analysis

Effect of Laser and Conventional Office Bleaching and Polishing on the Color Change of Stained Nanohybrid and Microhybrid Composite Resin

In Vitro Color Stability Evaluation of Three Polished and Unpolished Nanohybrid Resin Composites Immersed in a 0.12% Chlorhexidine-Based Mouthwash at Different Times

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