Optical Behavior and Surface Analysis of Dental Resin Matrix Ceramics Related to Thermocycling and Finishing

Porojan, Liliana; Toma, Flavia Roxana; Uţu, Ion Dragoş; Vasiliu, Roxana Diana

doi:10.3390/app12094346

Cited by 8 publications

(9 citation statements)

References 76 publications

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“…One of the main aims of the current study was to compare the effect of thermocycling on the color and gloss [44], difference in the thermal expansion coefficients between the filler particles and resin matrix induce internal stresses in the material during continuous temperature changes. Also, according to Reddy et al [45], thermal cycling increases water sorption in resin composites.…”

Section: Discussionmentioning

confidence: 99%

Effect of two artificial aging protocols on color and gloss of single-shade versus multi-shade resin composites

2022

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The long-term color stability and gloss retention of resin composites are among the crucial factors that affect the clinical longevity of esthetic restorations, especially in anterior teeth. This study evaluated the effect of artificial aging by immersion in different storage media and thermocycling on color and gloss of dental single-shade resin composite (Omnichroma) versus multi-shade one (Filtek Z350XT). One hundred resin-composite disc-shaped specimens were used, 50 from each group, Omnichroma and Filtek Z350XT. Ten specimens from each material acted as control group (incubated in saliva). For each material, 40 specimens were divided according to the artificial-aging protocol (immersion at 37 °C for 12 days or thermocycling for 10,000 cycles) and storage media (tea, red wine). Color and gloss were measured before and after artificial aging. Color difference (∆E00) was compared with perceptibility threshold and acceptability threshold. Data were statistically analyzed; independent t test was used to compare results between two tested materials, while two-way ANOVA was used to compare results among the different immersion media within the same material. Artificial aging (immersion or thermocycling) in tea and red wine led to significant color changes and gloss reduction in both materials (P < 0.05), in contrast to control group. Red wine produced highest color differences. Both dental resin-composites; the single-shade (Omnichroma) and multi-shade (Filtek Z350XT) displayed unacceptable discoloration and gloss reduction after artificial-aging in tea and red-wine by immersion or thermocycling simulating one-year clinical-service.

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Section: Discussionmentioning

confidence: 99%

Effect of two artificial aging protocols on color and gloss of single-shade versus multi-shade resin composites

2022

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“…Previous studies [ 60 , 61 ] have indicated that continuous temperature challenges, such as the one used in the present study, typically lead to internal stresses and increased water sorption, and suggested, based on previous scientific evidence [ 62 ], that 10,000 cycles correspond to one year of clinical service. El-Rashidy et al [ 63 ], while evaluating the effects of two aging protocols (thermocycling (37–57 °C) for 10,000 cycles and storage in either tea or red wine) on the color stability (in terms of Δ E 00 ) of commercially available composite resins, have demonstrated that all materials investigated (Omnichroma (Tokuyama Dental, Tokyo, Japan) and Filtek Z350 XT (3M ESPE, St. Paul, MN, USA)) displayed color variations that were statistically significant ( p < 0.001) and considered unacceptable (above PT and AT) after 10,000 cycles.…”

Section: Discussionmentioning

confidence: 72%

Shear Bond Strength and Color Stability of Novel Antibacterial Nanofilled Dental Adhesive Resins

et al. 2022

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Experimental adhesives containing co-doped metaloxide nanoparticles were demonstrated to display strong and long-term antibacterial properties against Streptococcus mutans biofilms. The present study represents an effort to characterize the shear-bond strength (SBS) and color stability (CS) of these novel biomaterials. Experimental adhesives were obtained by dispersing nitrogen and fluorine co-doped titanium dioxide nanoparticles (NF_TiO2, 10%, 20% or 30%, v/v%) into OptiBond Solo Plus (OPTB). Dentin surfaces were wet-polished (600-Grit). Specimens (n = 5/group) of Tetric EvoCeram were fabricated and bonded using either OPTB or experimental (OPTB + NF_TiO2) adhesives. Specimens were stored in water (37 °C) for twenty-four hours (T1), three months (T2), and six months (T3). At T1, T2, or T3, specimens were removed from water storage and were tested for SBS. Disc-shaped specimens (n = 10/group; d = 6.0 mm, t = 0.5 mm) of adhesives investigated were fabricated and subjected to thermocycling (10,000 cycles, 5–55 °C, 15 s dwell time). Specimens’ colors were determined with a VITA EasyshadeÒ V spectrophotometer (after every 1000 cycles). SBS data was analyzed using two-way ANOVA and post-hoc Tukey tests, while CS data was analyzed using one-way ANOVA and post-hoc Tukey tests (α = 0.05). Mean values of SBS ranged from 16.39 ± 4.20 MPa (OPTB + 30%NF_TiO2) to 19.11 ± 1.11 MPa (OPTB), from 12.99 ± 2.53 MPa (OPTB + 30% NF_TiO2) to 14.87 ± 2.02 (OPTB) and from 11.37 ± 1.89 (OPTB + 20% NF_TiO2) to 14.19 ± 2.24 (OPTB) after twenty-four hours, three months, and six months of water storage, respectively. Experimental materials had SBS values that were comparable (p > 0.05) to those from OPTB independently of nanoparticle concentration or time-point considered. Experimental materials with higher NF_TiO2 concentrations had less intense color variations and were more color stable than OPTB even after 10,000 thermocycles. In combination, the results reported have demonstrated that experimental adhesives can establish strong and durable bonds to human dentin while displaying colors that are more stable, thereby suggesting that the antibacterial nanotechnology investigated can withstand the harsh conditions within the oral cavity without compromising the esthetic component of dental restorations.

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“…It was recommended to reduce the surface roughness below this value. The R a = 0.2 μm was termed as "critical or threshold value̎ [ 18 ], [ 49 ]. In the present research, the roughness values detected by both the stylus profilometer and the AFM did not exceed the threshold value (0.2 μm) and were considered clinically accepted.…”

Section: Discussionmentioning

confidence: 99%

“…Thermocycling may increase water sorption, which may affect the mechanical properties of composites due to hydrolytic degradation and failure at the matrix-resin interface [ 17 , 18 ]. In addition, thermocycling was reported to increase the surface degradation of resin composites due to the induction of superficial stresses and the formation of microcracks [ 53 ].…”

Section: Discussionmentioning

confidence: 99%

“…Restorations placed in the oral environment are constantly subjected to thermal fluctuations due to the intake of foods and beverages at different temperatures [ 16 ]; however, few reports are available on how the temperature of these foods and beverages could affect composite resins, particularly regarding their surface roughness [ 16 ]. Thermocycling may increase water sorption, which could erode the surface of resin composites through the plasticizing effect of water and the hydrolysis of silane coupling agents [ 17 , 18 ]. In addition, the pH of beverages (such as tea, coffee, wine, and soda drinks) could greatly affect the surface integrity of the restoration.…”

Section: Introductionmentioning

confidence: 99%

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Effect of immersion and thermocycling in different beverages on the surface roughness of single- and multi-shade resin composites

El-Rashidy¹,

Shaalan²,

Abdelraouf³

et al. 2023

BMC Oral Health

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Background Resin composite restorations are highly esthetic restorations, which should have and maintain high surface polish. However, esthetic restorations are subjected to different beverages at variable temperatures, which may affect their surface roughness. This study aimed to evaluate the surface roughness of single-shade (Omnichroma) and multi-shade (Filtek Z350XT) composite materials, following aging by immersion and thermocycling in different beverages, simulating one year of clinical service. Methods Thirty specimens of each material were prepared and divided into 6 subgroups (n = 5). In each material, the grouping of the specimens was as follows: the first subgroup was the as-prepared specimens stored dry without immersion or thermocycling. The second, third, and fourth subgroups were immersed in saliva, tea, and red wine, respectively, for 12 days at 37 °C. The fifth and sixth subgroups were thermocycled for 10,000 cycles, in tea (the fifth between 37 and 57 °C) and in red wine (the sixth between 37 °C and12°C). The resultant surface roughness was measured by two different methods, stylus profilometer and atomic force microscopy (AFM). Intergroup comparison was performed using independent t test, while intragroup comparison was performed using one-way analysis of variance (ANOVA) followed by Tukey’s post-hoc test. Results Intergroup comparison between both composites showed no statistically significant differences in all groups using the stylus profilometer roughness measurements (P>0.05), while the AFM measurements showed significant difference (P ≤ 0.05) within all storage media except the as-prepared control (P = 0.0645), where nanofilled Filtek Z350 XT showed lower nano-roughness. Intragroup comparison data were variable, depending on the material, aging conditions, and roughness assessment tool. However, the resultant average surface roughness (Ra) values in all groups did not exceed the threshold value of Ra 0.2 μm. Conclusions Both resin composites attained and retained a clinically acceptable surface finish after immersion and thermocycling in different beverages.

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Optical Behavior and Surface Analysis of Dental Resin Matrix Ceramics Related to Thermocycling and Finishing

Cited by 8 publications

References 76 publications

Effect of two artificial aging protocols on color and gloss of single-shade versus multi-shade resin composites

Effect of two artificial aging protocols on color and gloss of single-shade versus multi-shade resin composites

Shear Bond Strength and Color Stability of Novel Antibacterial Nanofilled Dental Adhesive Resins

Effect of immersion and thermocycling in different beverages on the surface roughness of single- and multi-shade resin composites

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