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Turini NK, Berger SB, Lopes MB, Silva RP, Contreras DP, Carvalho-Ferreira TDJ, Gonini-Júnior A, Guiraldo RD. Shelf life effects on the bond strength and microhardness of self-adhesive resin cements. J Clin Exp Dent 2024; 16:e562-e569. [PMID: 38988750 PMCID: PMC11231887 DOI: 10.4317/jced.61362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/26/2024] [Indexed: 07/12/2024] Open
Abstract
Background Among the main advantages of self-adhesive resin cements comprise good aesthetics, strong restoration-tooth bond and biocompatibility. However, some disadvantages, such as high viscosity level, color limitation and short shelf life should be mentioned. Thus, the aim of the current study was to assess bond strength between fiberglass post and root dentin in teeth subjected to self-adhesive resin cements with expired shelf life and hardness. Material and Methods Sixty (60) single-rooted human teeth were sectioned and divided into 2 groups of different cements: U200 3M and MaxCem Elite Kerr. Each group was divided into 3 subgroups, based on self-adhesive resin cements' shelf life, namely: Within the use-time recommended by the manufacturer or no expiration date; 6 months after opening the aluminum blister; 12 months after opening the aluminum blister. Bond strength was measured through push-out test conducted in universal testing machine; fracture pattern was analyzed, and microhardness was investigated through Knoop test, based on hardness readings. Data were subjected to Shapiro-Wilk normality test; nonparametric test was applied to hardness data, whereas parametric test was applied to bond strength data. Hardness data were subjected to Kruskal-Wallis test, whereas bond strength data were subjected to analysis of variance, which was followed by Tukey test; both tests were conducted at 5% significance level (α = 0.05). Results There was no statistically significant difference in knoop hardness values recorded for the material / time / root thirds combination (p=0.483). There was no statistically significant difference in bond strength values recorded for the Material / Time / Thirds combination (p=0.237). Conclusions It was possible concluding that shelf life did not influence material's hardness and bond strength. Key words:Dental cements, Resin Cements, Shelf Life of Products.
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Affiliation(s)
- Nayra-Kawana Turini
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera -UNOPAR, Londrina, Paraná, Brazil
| | - Sandrine-Bittencourt Berger
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera -UNOPAR, Londrina, Paraná, Brazil
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera - Uniderp, Campo Grande, Mato Grosso do Sul, Brasil
| | - Murilo-Baena Lopes
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera -UNOPAR, Londrina, Paraná, Brazil
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera - Uniderp, Campo Grande, Mato Grosso do Sul, Brasil
| | - Ricardo-Petri Silva
- Department of Electrical Engineering, School of Electrical Engineering, State University of Londrina, Londrina, Paraná, Brazil
| | - Delise-Pellizzaro Contreras
- Department of Restorative Dentistry, School of Dentistry, State University of Londrina, Londrina, Paraná, Brazil
| | | | - Alcides Gonini-Júnior
- Department of Restorative Dentistry, School of Dentistry, State University of Londrina, Londrina, Paraná, Brazil
| | - Ricardo-Danil Guiraldo
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera -UNOPAR, Londrina, Paraná, Brazil
- Department of Restorative Dentistry, School of Dentistry, University Anhanguera - Uniderp, Campo Grande, Mato Grosso do Sul, Brasil
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Roesner AJ, Schmohl L, Hahnel S, Fuchs F, König A, Rauch A. Acid resistance of self-adhesive resin luting cements - changes in surface texture parameters and microhardness. Dent Mater 2022; 38:1376-1384. [PMID: 35773036 DOI: 10.1016/j.dental.2022.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 05/29/2022] [Accepted: 06/05/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVES When consumed in excess, acidic foods and beverages can cause dental erosions leading to irreversible loss of tooth substance. In many cases, prosthetic rehabilitation of the damaged teeth is mandatory. The aim of this in vitro study was to investigate, for the first time on this scale, the resistance of various commonly used self-adhesive resin luting cements (Bifix SE, VOCO; G-Cem LinkAce, GC; RelyX Unicem, 3 M Oral Care; SpeedCEM Plus, Ivoclar ) against acidic media, and to find out whether they can withstand long-term exposure. These results were compared with an adhesive resin luting cement (Panavia V5, Kuraray) that functioned as reference gold standard. Furthermore we applied area roughness parameters for surface texture analysis in the present investigation, to highlight their advantages for investigations on the surface quality of resin luting cements. METHODS Six specimens with identical diameter (10 mm) and thickness (3 mm) were prepared from each self-adhesive and adhesive resin luting cement and forwarded to an incubation in various acidic media for a period of 232 h. Conductivity and pH-values of each acidic medium was analyzed for each material group prior (t 0) and after exposure (t 1). The specimens were examined for Vickers microhardness and surface quality. For the evaluation of surface roughness, the parameters Sa, Sdr, Spc Spk, Sk, and Svk were investigated by using different filtered surfaces (S-L; S-F) according to ISO 25 178. Statistical analysis was conducted at a significance level of α = 0.050. RESULTS For the evaluation of the acid resistance of self-adhesive resin luting cements investigations on conductivity and pH-value assessment of storage solution appear unsuitable, while the assessment of microhardness and surface analysis revealed valid data. It could be shown that changes in surface texture of the resin luting cements can be determinend in qualitative and quantitative manner. While the microhardness and surface quality of some resin luting cements hardly changed, others showed significantly reduced values in microhardness and changes in their surface quality (p < 0.001). SIGNIFICANCE The data of the current study emphasize the relevance of interactions between resin luting cements and acids and suggest further laboratory and clinical studies to elucidate its impact on the clinical performance of the materials investigated.
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Affiliation(s)
- Anuschka Josephine Roesner
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany; Department of Prosthetic Dentistry, Faculty of Medicine, Medical Center, Center for Dental Medicine, University of Freiburg, Germany.
| | - Leonie Schmohl
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany
| | - Sebastian Hahnel
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany; Department of Prosthetic Dentistry, UKR University Hospital Regensburg, Germany
| | - Florian Fuchs
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany
| | - Andreas König
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany
| | - Angelika Rauch
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany; Department of Prosthetic Dentistry, UKR University Hospital Regensburg, Germany
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Mainardi MDCAJ, Giorgi MCC, Lima DANL, Marchi GM, Ambrosano GM, Paulillo LAMS, Aguiar FHB. Effect of energy density and delay time on the degree of conversion and Knoop microhardness of a dual resin cement. ACTA ACUST UNITED AC 2014; 6:53-8. [PMID: 24510456 DOI: 10.1111/jicd.12075] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 06/09/2013] [Indexed: 11/29/2022]
Abstract
AIM In the present study, we evaluated the influence of the photo-curing delay time and energy density on the degree of conversion and the Knoop microhardness of a resin cement. METHODS Seventy-eight samples were assigned to 13 groups (n = 6), one of which received no light curing (control). The samples were made of a dual-cured resin cement (RelyX ARC) with the aid of a Teflon matrix, submitted to one of the following energy densities (J/cm²): 7, 14, 20, and 28. Delay times were immediate (0), 1 min, or 2 min. After 24 h, the degree of conversion and microhardness were measured at three segments: cervical, medium, and apical. Data were submitted to three-way anova and Tukey's and Dunnett's tests, the latest of which was used to compare the control to the experimental groups. RESULTS No interaction was observed between delay time and energy density regarding the degree of conversion. The cervical segment showed the highest values, while the apical showed the lowest. Microhardness values concerning the cervical segment in all groups were statistically different from that obtained for the control. CONCLUSION A high-irradiance light-curing unit allows for a reduced irradiation exposure time with a short delay time, aimed at tooth restorations using a dual-cured resin cement.
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