scholarly journals Effect of antibacterial agents on the surface hardness of a conventional glass-ionomer cement

2012 ◽  
Vol 20 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Tamer Tüzüner ◽  
Tezer Ulusu
Keyword(s):  
Antibacterial Agents ◽  
Glass Ionomer Cement ◽  
Surface Hardness ◽  
Glass Ionomer ◽  
Ionomer Cement

Surface Hardness Properties of Resin-Modified Glass Ionomer Cements and Polyacid-Modified Composite Resins

2004 ◽  
Vol 5 (4) ◽  
pp. 42-49 ◽  
Author(s):  
Yusuf Ziya Bayindir ◽  
Mehmet Yildiz
Keyword(s):  
Glass Ionomer Cement ◽  
Water Storage ◽  
Surface Hardness ◽  
Composite Resins ◽  
Bottom Surface ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Hardness Values ◽  
Ionomer Cement

Abstract In this study the top and bottom surface hardness of two polyacid-modified composite resins (PMCRs), one resin-modified glass ionomer cement (RMGIC), and one composite resin were evaluated. The affect of water storage on their hardness was also investigated. The study was conducted using four different groups, each having five specimens obtained from fiberglass die molds with a diameter of 5 mm and a height of 2 mm. Measurements were made on the top and bottom surface of each specimen and recorded after 24 hours and again at 60 days. All tested materials showed different hardness values, and the values of top surfaces of the specimens were found to be higher than the bottom surface in all test groups. There was no statistical difference in the Vickers hardness (HV) values when the test specimens were kept in water storage. In conclusion Hytac displayed microhardness values higher than Vitremer and Dyract. We found the order of HV values to be Surfil > Hytac > Dyract > Vitremer, respectively. Vitremer presented the lowest microhardness level and Surfil the highest. Citation Bayindir YZ, Yildiz M. Surface Hardness Properties of Resin-Modified Glass Ionomer Cements and Polyacid-Modified Composite Resins. J Contemp Dent Pract 2004 November;(5)4:042-049.

scholarly journals Addition of Chlorhexidine Gluconate to a Glass Ionomer Cement: A Study on Mechanical, Physical and Antibacterial Properties

2014 ◽  
Vol 25 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Luana Mafra Marti ◽  
Margareth da Mata ◽  
Beatriz Ferraz-Santos ◽  
Elcilaine Rizzato Azevedo ◽  
Elisa Maria Aparecida Giro ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Bond Strength ◽  
Setting Time ◽  
Glass Ionomer Cement ◽  
Surface Hardness ◽  
Tensile Bond Strength ◽  
Glass Ionomer ◽  
Diffusion Test ◽  
Agar Diffusion Test ◽  
Ionomer Cement

The objective of this work was to determine the effect of different concentrations of chlorhexidine digluconate (CHX) on setting time, surface hardness, maximum tensile bond strength and antibacterial activity of a glass ionomer cement (GIC). The material used as control was Ketac Molar Easymix GIC. CHX was incorporated into the GIC during its manipulation at concentrations of 0.5, 1.0 and 2.0%. Antimicrobial activity against S. mutans and L. acidophilus was evaluated by means of agar diffusion test. Tensile bond strength data were analyzed statistically using Analysis of variance and Tukey's test. Setting time, Vickers hardness and agar diffusion test were analyzed using Kruskal-Wallis and Mann-Whitney tests at a significance level of 5%. It was observed that adding CHX at concentrations of 1% and 2% increased significantly the setting time of the material (p=0.012 and p=0.003, respectively). There was no significant difference between control and 0.5% CHX groups regarding the setting time. Addition of 2% CHX decreased significantly the surface hardness in relation to the control group (p=0.009), followed by the 1% CHX group (p=0.009). The tensile bond strength of the material also decreased significantly after adding CHX at a concentration of 2% (p=0.001). Addition of CHX promoted formation of an inhibition halo in both bacterial strains for all concentrations. The results showed that the best option for clinical use of GIC with CHX is at 0.5% concentration, since antibacterial activity increased and the physical-mechanical properties remained unchanged.

Applied Research Glass Ionomer Cement with TiO2 Nanoparticles in Orthodontic Treatment

2021 ◽  
Vol 21 (2) ◽  
pp. 1032-1041
Author(s):  
Jiajie Ren ◽  
Zhen Du ◽  
Jiang Lin
Keyword(s):  
Compressive Strength ◽  
Titanium Dioxide ◽  
Antibacterial Effect ◽  
Titanium Dioxide Nanoparticles ◽  
Glass Ionomer Cement ◽  
Antibacterial Properties ◽  
Surface Hardness ◽  
Glass Ionomer ◽  
Adhesion Properties ◽  
Ionomer Cement

In orthodontics treatment, scholars have tried to introduce nano antibacterial materials into the materials used in orthodontics to reduce the occurrence of enamel demineralization, caries and periodontitis. The experiment investigated the effect of adding titanium dioxide nanoparticles in different proportions on the flexural strength, compressive strength, surface hardness, tribological properties, adhesion properties, fluorine release properties and antibacterial properties of glass ionomer cement. The effect of water cement on orthodontics, the experiment added different proportions of titanium dioxide nanoparticles to traditional glass ion cement, which greatly improved the mechanical strength of glass ion cement, and significantly improved the antibacterial effect of glass ion cement, bending strength, compressive strength and surface hardness. The addition of titanium dioxide nanoparticles produced a significant antibacterial effect on Streptococcus mutants. Nano-TiO2 glass ionomer cement has a significant effect on orthodontics, and the damage to patients’ teeth is significantly lower, which is worthy of clinical popularization.

Influence of ultrasonic excitation on microhardness of glass ionomer cement

2020 ◽  
Vol 28 (6) ◽  
pp. 587-592
Author(s):  
Navara Tanweer ◽  
Rizwan Jouhar ◽  
Muhammad Adeel Ahmed
Keyword(s):  
Glass Ionomer Cement ◽  
Surface Hardness ◽  
Hardness Test ◽  
Glass Particle ◽  
P Value ◽  
Glass Ionomer ◽  
Group I ◽  
Group Ii ◽  
The Difference ◽  
Ionomer Cement

BACKGROUND: Numerous researchers have attempted to improve the mechanical properties of glass ionomer cement since 1972. In this study, ultrasonic curing treatment was introduced during the mixing of glass ionomer cement (GC Fuji IX) to facilitate intimate mixing, compaction and adaptation of residual glass particle which consequently improves densification of the material. OBJECTIVE: To assess the influence of ultrasonic treatment on the microhardness of glass ionomer cement (GC Fuji IX) and compare it with the conventionally cured method. METHODS: A total of 40 specimens (2 × 2 mm) were fabricated and equally divided into two groups: Group I (conventional curing method) and Group II (ultrasonically cured). For Group II, an ultrasonic scaler was used which provides energy to ensure proper mixing of material without leaving any air bubbles or unmixed particles. Vicker’s hardness test was employed to generate the average microhardness values by making three indentations at different points on each specimen. Statistical Package for Social Sciences (SPSS) Version 17 was used, employing independent samples T test to compare the difference in microhardness values between two curing groups. RESULTS: The average surface hardness value for conventional cured GIC was 62.21 ± 13.61 while ultrasonically cured GIC exhibited a higher mean microhardness value of 66.37 ± 12.83. Additionally, the average microhardness values produced by the two groups showed statistically significant differences (p value < 0.035). CONCLUSION: Ultrasonic excitation treatment leads to intimate mixing and accelerated hardening of glass ionomer cement thereby enhancing its microhardness and reducing early weakness.

scholarly journals Evaluation of the Surface Hardness and Roughness of a Resin-Modified Glass Ionomer Cement Containing Bacterial Cellulose Nanocrystals

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Maryam Saadat ◽  
Marzieh Moradian ◽  
Babak Mirshekari
Keyword(s):  
Surface Roughness ◽  
Bacterial Cellulose ◽  
Cellulose Nanocrystals ◽  
Glass Ionomer Cement ◽  
Surface Hardness ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Negative Effect ◽  
The One ◽  
Ionomer Cement

The purpose of this study was to evaluate the performance of a resin-modified glass ionomer cement (RMGIC) to which bacterial cellulose nanocrystals (BCNs) were added. BCNs were incorporated into the RMGIC powder in ratios of 0.3%, 0.5%, and 1% (w/w). One control and three experimental groups were enrolled in the study: unmodified RMGIC (control), 0.3% (w/w) BCN-modified RMGIC, 0.5% (w/w) BCN-modified RMGIC, and 1% (w/w) BCN-modified RMGIC. The surface hardness and surface roughness were the parameters assessed. The materials were characterized by scanning electron microscopy (SEM). The data were analyzed using the one-way ANOVA and Kruskal–Wallis tests for surface hardness and roughness, respectively. The addition of BCN resulted in the improvement of surface roughness in all the specimens compared with the control material. The RMGIC modified by 1% (w/w) BCN showed the lowest surface roughness (decreased by 52%) among all tested groups. However, BCN had a negative effect on the surface hardness of RMGIC. The group with 0.3% (w/w) BCN had the least decrease in microhardness (13%). According to the results, the RMGIC group modified by 1% (w/w) BCN had a smoother surface than the other groups. The surface microhardness of the RMGIC decreased after BCNs were added to it.

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