Influence of Pre-curing warming on micro-leakage, micro-hardness and degree of conversion of high viscosity bulk fill composite resins: An in vitro study

2018 ◽  
Vol 64 (3) ◽  
pp. 2717-2735
Author(s):  
Eman Elbahrawy ◽  
Reham Attia
Keyword(s):  
In Vitro Study ◽  
High Viscosity ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Vitro Study ◽  
Micro Hardness

Interactions Between Dental Composite Resins and Saliva A comparative biochemical in vitro study

2019 ◽  
Vol 56 (3) ◽  
pp. 529-533
Author(s):  
Mihaela Pantea ◽  
Diana Andreea Ighigeanu ◽  
Alexandra Totan ◽  
Maria Greabu ◽  
Daniela Miricescu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
In Vitro Study ◽  
Composite Resins ◽  
Vitro Study ◽  
Dental Composite ◽  
Gamma Glutamyl Transferase ◽  
Specific Protocol ◽  
Dental Composite Resins ◽  
Glutamyl Transferase

This in vitro study analyses the biochemical interaction between saliva and three types of dental composite resins (a direct resin, an indirect resin and a dual-cure resin used for cementation of indirect dental restorations). The resin samples were obtained following a specific protocol and in line with the producers� recommendations; the resin samples were incubated with saliva samples collected from 19 healthy volunteers. The obtained results showed that the tested composite resins did not produce significant changes in oxidative stress parameters that were analysed (albumin, uric acid, GGT / gamma glutamyl transferase, OXSR-1 / oxidative stress responsive kinase 1) and do not influence the inflammatory salivary status reflected by the levels of IL-6 - an inflammatory marker.

scholarly journals Depth-Related Curing Potential of Ormocer- and Dimethacrylate-Based Bulk-Fill Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6753
Author(s):  
Ramona S. Oltramare ◽  
Reto Odermatt ◽  
Phoebe Burrer ◽  
Thomas Attin ◽  
Tobias T. Tauböck
Keyword(s):  
Double Bond ◽  
Repeated Measures ◽  
In Vitro Study ◽  
High Viscosity ◽  
Degree Of Conversion ◽  
Double Bond Conversion ◽  
Nanohybrid Composite ◽  
Post Hoc ◽  
One Way Anova

The aim of this in vitro study was to investigate the degree of C=C double bond conversion of high-viscosity dimethacrylate- or ormocer-based bulk-fill composites as a function of measurement depth. Four bulk-fill composites (Tetric EvoCeram Bulk Fill, x-tra fil, SonicFill, and Bulk Ormocer) and the conventional nanohybrid composite Tetric EvoCeram were applied in standardized Class II cavities (n = 6 per group) and photoactivated for 20 s at 1350 mW/cm2. The degree of conversion of the composites was assessed using Fourier-transform infrared spectroscopy at seven measurement depths (0.15, 1, 2, 3, 4, 5, 6 mm). Data were analyzed using repeated measures ANOVA and one-way ANOVA with Bonferroni post-hoc tests (α = 0.05). The investigated bulk-fill composites showed at least 80% of their maximum degree of conversion (80% DCmax) up to a measuring depth of at least 4 mm. Tetric EvoCeram Bulk Fill and Bulk Ormocer achieved more than 80% DCmax up to a measuring depth of 5 mm, x-tra fil up to 6 mm. The conventional nanohybrid composite Tetric EvoCeram achieved more than 80% DCmax up to 3 mm. In contrast to the conventional composite, the investigated ormocer- and dimethacrylate-based bulk-fill composites can be photo-polymerized in thick layers of up to at least 4 mm with regard to their degree of C=C double bond conversion.

scholarly journals Shear Bond Strength of Three Composite Resins to Fluorosed and Sound Dentine: In Vitro Study

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Sabra Jaâfoura ◽  
Amira Kikly ◽  
Saida Sahtout ◽  
Mounir Trabelsi ◽  
Dorra Kammoun
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Adhesive System ◽  
Composite Resins ◽  
Vitro Study ◽  
Adhesion Forces ◽  
Average Shear ◽  
One Way Anova

Introduction. This in vitro study compared the shear strength of three composite resin systems to fluorosed and normal dentin. Methods. Silorane FiltekTM P90, FiltekTMZ250 XT in combination with the adhesive system AdperTM Single bond 2, and Amelogen® Plus in association with Peak Universal Bond® were tested. Fifteen normal and 15 fluorosed dentine disks were prepared per material. The shear bond strength test was performed using a universal machine. Results. One-way ANOVA revealed significant differences in bond strength between the tested composite resins. All tested materials had significantly different adhesion at the fluorosed and the nonfluorosed interface. FiltekTM Z250 XT and Silorane had lower adhesion values to fluorosed than to normal dentin. In contrast, Amelogen® Plus presented a better average resistance at the fluorosed interface. Conclusion. Amelogen® Plus presented a better average shear bond strength on the fluorosed dentine. FiltekTMZ250 XT showed the best adhesion forces and shear bond strength with sound dentine. Further studies are needed to better understand the sealing of these systems.

scholarly journals Comparative evaluation of microleakage of nano-filled resin-modified glass ionomer: An in vitro study

2014 ◽  
Vol 08 (04) ◽  
pp. 450-455 ◽  
Author(s):  
Nesrin Eronat ◽  
Emir Yilmaz ◽  
Nazan Kara ◽  
Asli Topaloglu Ak
Keyword(s):  
Third Molar ◽  
In Vitro Study ◽  
High Viscosity ◽  
Vitro Study ◽  
Glass Ionomer ◽  
Class V ◽  
Dye Penetration ◽  
Resin Modified Glass Ionomer ◽  
Group B

ABSTRACT Objective: This in vitro study evaluated the microleakage of a nano-filled resin-modified glass ionomer and a high viscosity glass-ionomer restorations in class V cavities. Materials and Methods: Thirty-two class V cavities prepared on the buccal and lingual surfaces of 16 sound, third molar teeth were randomly assigned into two groups and restored by one of the glass ionomer material; Group A: A high viscosity (Ketac Molar, 3M ESPE) Group B: A nano-filled resin-modified (Ketac N100, 3M ESPE) glass ionomer. One clinician prepared all the cavities. The materials were used according to the manufacturers’ recommendations. The restored teeth were then stored in distilled water at 37°C for 24 h, thermocycled at 5-55°C for 1000 cycles. The specimens were immersed in aqueous solution of Indian ink dye for 48 h at room temperature. They were embedded in resin polyester and sectioned longitudinally in a buccolingual direction. Microleakage was assessed according to the depth of dye penetration along the restoration. The extent of dye penetration at the occlusal and gingival margins was assessed using a stereo microscope. Randomly selected samples from each group were prepared for scanning electron microscope evaluation. The data were statistically analyzed with Friedman and Wilcoxon signed ranks tests. Results: There were statistically significant differences between the microleakage scores of the two groups for both occlusal and gingival scores (P = 0.001). Occlusal and gingival scores for high viscosity glass ionomer (P = 0.024) and nanoionomer (P = 0.021) using Wilcoxon signed ranks tests showed statistically significant differences. High viscosity glass ionomer showed significantly less microleakage compared to the nano-filled resin-modified glass-ionomer (RMGIs) at occlusal margin (P = 0.001). No significant differences were found between the groups at gingival margin (P = 0.0317). Conclusion: Within the limitations of this in vitro study, nano-filled RMGIs restorations did not perform better than high viscosity glass ionomer in class V cavities in terms of microleakage assessment.

Cytotoxic evaluation of hydroxyapatite-filled and silica/hydroxyapatite-filled acrylate-based restorative composite resins: An in vitro study

2016 ◽  
Vol 116 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Harshita Chadda ◽  
Sangeetha Vasudevaraj Naveen ◽  
Saktiswaren Mohan ◽  
Bhabani K. Satapathy ◽  
Alok R. Ray ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Composite Resins ◽  
Vitro Study
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