scholarly journals Effect of Bleaching Agents on the Sealing of Cervical Barrier in Intracoronal Bleaching Procedures

2013 ◽  
Vol 4 (4) ◽  
pp. 235-240
Author(s):  
Carlos Rocha Gomes Torres ◽  
Maria Filomena Rocha Lima Huhtala ◽  
Ana Paula Martins Gomes ◽  
Carolina Judica Ramos ◽  
Karen Cristina Kazue Yui ◽  
...  
Keyword(s):  
Glass Ionomer Cement ◽  
Control Group ◽  
Sodium Perborate ◽  
Carbamide Peroxide ◽  
Root Canal Filling ◽  
Significance Level ◽  
Resin Modified Glass Ionomer ◽  
Bleaching Treatment ◽  
Ionomer Cement

ABSTRACT Discoloration of nonvital teeth is an esthetic deficiency frequently requiring bleaching treatment. The purpose of this study was to evaluate in vitro the effect of bleaching agents on two different cervical barriers in order to minimize or prevent the leakage along the root canal filling in the intracoronal bleaching procedures. Ninety-six extracted human molars were used which were biomechanically prepared, filled and divided into eight groups. The cervical barriers tested were zinc phosphate cement (ZPC) and resin-modified glass ionomer cement (RMGIC) applied (3 mm of thickness) at the cementoenamel junction level. Forty-eight specimens were divided into four groups for each cervical barrier: (1) control group without bleaching agent, (2) a mixture of sodium perborate and distilled water, (3) a mixture of sodium perborate and 10% carbamide peroxide and (4) a mixture of sodium perborate and 35% carbamide peroxide. The bleaching agents were placed inside the pulp chamber for 7 and 14 days, and the access opening was sealed with Cimpat. After 21 days, microleakage evaluation of 2% rhodamine B dye solution at dentin-cervical barrier interface was performed by a stereomicroscope. Data were submitted to Kruskal-Wallis, Dunn's and Dunnett's tests, with a significance level of 0.05. The results demonstrated no statistically significant differences among the control group and the experimental groups for each cervical barrier (ZPC and RMGIC); there were no significant differences among the bleaching agents for the same barrier and RMGIC barrier provided better sealing than ZPC (p < 0.05). Therefore, the bleaching agents demonstrated similar performance when tested for the same cervical barrier and RMGIC barrier provided better sealing than the ZPC barrier, regardless of the association of bleaching agents used. How to cite this article Yui KCK, Huhtala MFRL, da Silva EG, Ramos CJ, Torres CRG, de Paiva Gongalves SE, Gomes APM. Effect of Bleaching Agents on the Sealing of Cervical Barrier in Intracoronal Bleaching Procedures. World J Dent 2013;4(4): 235-240.

Protective Effect of Resin Coating on the Microleakage of Class V Restorations Following Treatment with Carbamide Peroxide In Vitro

2010 ◽  
Vol 35 (6) ◽  
pp. 634-640 ◽  
Author(s):  
H. Yu ◽  
Q. Li ◽  
T. Attin ◽  
Y. Wang
Keyword(s):  
Protective Effect ◽  
Clinical Relevance ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Carbamide Peroxide ◽  
Class V ◽  
Resin Coating ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

Clinical Relevance Carbamide peroxide treatment increased the microleakage of Class V conventional glass-ionomer cement and resin modified glass-ionomer cement restorations. The resin coating is an effective method to avoid bleaching-induced microleakage without affecting the bleaching outcome.

scholarly journals The Effect of Three Dentinal Sealers on Retention of Crowns cemented with Resin-modified Glass Ionomer Cement: An in vitro Study

2015 ◽  
Vol 6 (1) ◽  
pp. 10-15
Author(s):  
Ashish R Jain ◽  
R Pradeep ◽  
Sashi Deepth Reddy Janapala ◽  
P Sesha Reddy
Keyword(s):  
Bond Strength ◽  
Glass Ionomer Cement ◽  
T Test ◽  
Control Group ◽  
P Value ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Desensitizing Agents ◽  
Ionomer Cement

ABSTRACT Background Dentinal sealers (desensitizing agents) are used to protect the pulp from possible injurious effects after tooth preparation and also prevent the penetration of dentinal tubules by bacteria and their products which are currently thought to cause most of the pulpal inflammation under the crowns. Aim The purpose of this study is to determine the efficacy of effect of three different desensitizing agents on retention of crowns cemented with resin-modified glass ionomer cement. Materials and methods Forty freshly extracted maxillary first premolars were notched for retention and the teeth specimens were mounted in autopolymerising resin. The axial height of all the specimens was 4 mm with a 20° angle of convergence. Impressions of the prepared teeth were made, later waxed invested and casted. Thirty teeth were coated with three different desensitizing agents were used in this study: Cavity varnish (Namuvar, Deepti Dental Products), Glutaraldehyde (Gluma- Heraeus Kulzer), Resin (AdheSE, Ivoclar Vivadent). Ten teeth were not coated with desensitizing agents to act as control group. Independent T test used to compare the mean values between groups. Results Tensile strength for average surface area of the groups I, II, III and IV are 0.3759, 0.2375, 0.2411, 0.2348 respectively. The t-test shows ‘p’-value is statistically not significant (p < 0.05) for groups II and III, where as in group IV ‘p’-value is statistically significant (p < 0.01). Conclusion The use of AdheSE/resin-based dentinal sealer showed increase in bond strength of the crowns luted with resin-modified glass ionomer cement when compared with control group. This study advocates the use of resin-based sealer or a glutaraldehyde-based sealer before cementation of the crowns. The cavity varnish, however, reduces the bond strength and is not acceptable. How to cite this article Janapala SDR, Reddy PS, Jain AR, Pradeep R. The Effect of Three Dentinal Sealers on Retention of Crowns cemented with Resin-modified Glass Ionomer Cement: An in vitro Study. World J Dent 2015;6(1):10-15.

Analysis of Photoreflectance and Microhardness of the Enamel in Primary Teeth Submitted to Different Bleaching Agents

2007 ◽  
Vol 32 (1) ◽  
pp. 9-12 ◽  
Author(s):  
Sabrina Fróes Faria Campos ◽  
Ilene Cristine Rosia César ◽  
Egberto Munin ◽  
Priscila Christiane Suzy Liporoni ◽  
Marcos Augusto do Rego
Keyword(s):  
Primary Teeth ◽  
Point Of View ◽  
Control Group ◽  
Sodium Perborate ◽  
Carbamide Peroxide ◽  
Color Changes ◽  
Significant Difference ◽  
Student’S T ◽  
Bleaching Treatment

Treatment of darkened teeth in children is of great importance from an esthetic-functional point of view and for the psychoemotional development of the child. The objective of the present study was to determine the in vitro efficacy of three bleaching agents for whitening of artificially stained primary teeth. Fifty anterior primary teeth were artificially stained and then divided into three experimental groups (n = 15) submitted to bleaching treatment with 35% hydrogen peroxide gel, 35% carbamide peroxide gel, and 35% carbamide peroxide gel mixed with sodium perborate powder. The control group (n = 5) was not submitted to any bleaching treatment. Color changes were evaluated with a reflectance spectrophotometer and possible alterations in the enamel surface after bleaching were measured by Vickers microhardness testing. The data were assessed using the Student's t test. The results confirmed the bleaching action of the three agents tested. No significant difference in mean microhardness was observed between the three bleaching agents when compared to the control group.

In vitro Evaluation of Topical Fluoride Varnishes Effect on Enamel Demineralization Around Orthodontic Brackets

2018 ◽  
Vol 69 (11) ◽  
pp. 3013-3017
Author(s):  
Roxana Oancea ◽  
Anca Mesaros ◽  
Octavia Iulia Balean ◽  
Angela Codruta Podariu
Keyword(s):  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Orthodontic Brackets ◽  
Fluoride Varnish ◽  
Control Group ◽  
Glass Ionomer ◽  
Mean Values ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

The aim of this in vitro study was to test the effectiveness of applying the fluoride varnish on bracketed teeth with 2 types of bonding agent. 10 patients aged 12-18 (mean age 13.06 +/- 1.72 years) were scheduled to have the four fist premolar teeth extracted. The teeth were dived in 4 groups: 2 experimental and 2 controls. The teeth were cut in half so 80 surfaces were analyzed. The brackets were collated with Transbond XT and Fuji Ortho Lc. For each of the materials that have been used there was a test and a control group. The tests groups received one single application of Duraphat. The content in fluoride was measured by spectrophotometer. The mean values of fluoride indicated an important increase in the fluoride content after using resin modified glass ionomer cement and fluoride varnish. Statistically significant differences were determined between each of the control and treatment group when both materials have been used, after 10 days and one month application of the varnish. The study pointed out that the fluoride varnish combined with resin modified glass ionomer cement is more efficient than the classical resin composite in preventing demineralization around orthodontic brackets.

scholarly journals Quantitative Evaluation by Glucose Diffusion of Microleakage in Aged Calcium Silicate-Based Open-Sandwich Restorations

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
S. Koubi ◽  
H. Elmerini ◽  
G. Koubi ◽  
H. Tassery ◽  
J. Camps
Keyword(s):  
Calcium Silicate ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Calcium Silicate Cement ◽  
Resin Modified Glass Ionomer ◽  
Glucose Diffusion ◽  
Negative Controls ◽  
Phosphate Buffered Saline ◽  
Ionomer Cement

This study compared thein vitromarginal integrity of open-sandwich restorations based on aged calcium silicate cement versus resin-modified glass ionomer cement. Class II cavities were prepared on 30 extracted human third molars. These teeth were randomly assigned to two groups () to compare a new hydraulic calcium silicate cement designed for restorative dentistry (Biodentine, Septodont, Saint Maur des Fossés, France) with a resin-modified glass ionomer cement (Ionolux, Voco, Cuxhaven, Germany) in open-sandwich restorations covered with a light-cured composite. Positive () and negative () controls were included. The teeth simultaneously underwent thermocycling and mechanocycling using a fatigue cycling machine (1,440 cycles, 5–55°C; 86,400 cycles, 50 N/cm2). The specimens were then stored in phosphate-buffered saline to simulate aging. After 1 year, the teeth were submitted to glucose diffusion, and the resulting data were analyzed with a nonparametric Mann-Whitney test. The Biodentine group and the Ionolux group presented glucose concentrations of 0.074 ± 0.035 g/L and 0.080 ± 0.032 g/L, respectively. No statistically significant differences were detected between the two groups. Therefore, the calcium silicate-based material performs as well as the resin-modified glass ionomer cement in open-sandwich restorations.

In Vitro Effect of Simulated Tooth Brushing and Children’s Mouth Rinses on Physical Properties of Glass Ionomer Cement

2020 ◽  
Vol 44 (5) ◽  
pp. 342-347
Author(s):  
Natyla ML Silva ◽  
Victor G Costa ◽  
Letícia M Gonçalves ◽  
Isabella A Gomes ◽  
Marco Aurélio B Paschoal
Keyword(s):  
Surface Roughness ◽  
Glass Ionomer Cement ◽  
Tooth Brushing ◽  
Control Group ◽  
Glass Ionomer ◽  
Intergroup Comparison ◽  
Vitro Effect ◽  
Dependent Samples ◽  
Ionomer Cement

Objective: The present study investigated the erosive potential of children’s mouthrinses on glass ionomer cement (GIC) samples after simulated toothbrushing. Study design: Forty round-shaped samples of GIC were divided into 3 groups: G1- cetylpyridinium chloride, G2- xylitol and triclosan and G3–Malva sylvestris and xylitol and G4–distilled water as a control group. Prior to the main tests, the samples were submitted to the surface roughness measurement (Ra) and weight analysis (W). Afterward, they were brushed twice day (2× / day) for 15 days and immersed in mouthrinses after the last daily brushing. The final surface roughness (R2) and weight (W2) were determined after completing the tooth brushing-mouth rinsing cycles and the real increase in roughness (ΔRa) and real weight loss (ΔW) were calculated. In addition, stereoscopic images taken at 30× magnification. The data was analyzed by one-way ANOVA and Tukey-test post hoc tests for intergroup comparison and the T-test for dependent samples (α = 0.05). Results: Only group G2 showed increased in roughness ΔRa (1.53 ± 0.94) whereas ΔW values were not significant. However, evident cracks and voids were verified for all tested children’s rinses. Conclusion: Thus, children’s mouthrinse containing xylitol / triclosan increased the GIC roughness, especially when associated with brushing.

scholarly journals Residual HEMA and TEGDMA Release and Cytotoxicity Evaluation of Resin-Modified Glass Ionomer Cement and Compomers Cured with Different Light Sources

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Murat Selim Botsali ◽  
Adem Kuşgöz ◽  
Subutay Han Altintaş ◽  
Hayriye Esra Ülker ◽  
Mehmet Tanriver ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diode ◽  
Glass Ionomer Cement ◽  
Triethylene Glycol ◽  
Control Group ◽  
Light Sources ◽  
Fibroblast Cells ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

The purpose of this study was first to evaluate the elution of 2-hydroxyethyl methacrylate (HEMA) and triethylene glycol dimethacrylate (TEGDMA) monomers from resin-modified glass ionomer cement (RMGIC) and compomers cured with halogen and light-emitting diode (LED) light-curing units (LCUs). The effect of cured materials on the viability of L929 fibroblast cells was also evaluated. One RMGIC (Ketac N100) and two compomers (Dyract Extra and Twinkystar) were tested. Materials were prepared in teflon disks and light-cured with LED or halogen LCUs. The residual monomers of resin materials in solution were identified using high-performance liquid chromatography. The fibroblast cells’ viability was analyzed using MTT assay. The type of LCU did not have a significant effect on the elution of HEMA and TEGDMA. A greater amount of HEMA than TEGMDA was eluted. The amount of TEGDMA eluted from Twinkystar was greater than Dyract Extra (P<0.05) when cured with a halogen LCU. All material-LCU combinations decreased the fibroblast cells’ viability more than the control group (P<0.01), except for Dyract Extra cured with a halogen LCU (P>0.05). Curing with the LED LCU decreased the cells’ viability more than curing with the halogen LCU for compomers. For Ketac N100, the halogen LCU decreased the cells’ viability more than the LED LCU.

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