scholarly journals Bioactive Materials Subjected to Erosion/Abrasion and Their Influence on Dental Tissues

2020 ◽  
Vol 45 (3) ◽  
pp. E114-E123
Author(s):  
ÍEL Viana ◽  
Y Alania ◽  
S Feitosa ◽  
AB Borges ◽  
RR Braga ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Erosive Wear ◽  
Acrylic Resin ◽  
High Viscosity ◽  
Material Surface ◽  
Bioactive Materials ◽  
Dental Tissues ◽  
Significant Protective Effect ◽  
Ionomer Cement

SUMMARY Objective: The objective of this study was to evaluate the effect of erosion or erosion-abrasion on bioactive materials and adjacent enamel/dentin areas. Methods and Materials: Enamel and dentin blocks (4×4×2 mm) were embedded side by side in acrylic resin, and a standardized cavity (1.2×4×1.5 mm) was prepared between them. Preparations were restored with the following materials: composite resin (Filtek Z350, control); experimental composite containing di-calcium phosphate dihydrate particles (DCPD); Giomer (Beautifil II), high viscosity glass ionomer cement (GIC, Fuji IX); and a resin-modified GIC (Fuji II LC). The specimens were submitted to two cycling models (n=10): erosion or erosion-abrasion. The challenges consisted of five-minute immersion in 0.3% citric acid solution, followed by 60-minute exposure to artificial saliva. Toothbrushing was carried out twice daily, 30 minutes after the first and last exposures to acid. Dental and material surface loss (SL, in μm) were determined by optical profilometry. Data were analyzed with Kruskal-Wallis and Dunn tests (α=0.05). Results: Under erosion, for enamel, only the GIC groups presented lower SL values than Z350 (p<0.001 for Fuji IX and p=0.018 for Fuji II LC). For dentin, none of the materials showed significantly lower SL values than Z350 (p>0.05). For material, the GICs had significantly higher SL values than those of Z350 (p<0.001 for Fuji IX and p=0.002 for Fuji II LC). Under erosion-abrasion, the enamel SL value was significantly lower around Fuji II LC compared with the other materials (p<0.05). No significant differences were observed among groups for dentin SL (p=0.063). The GICs and Giomer showed higher SL values than Z350 (p<0.001 for the GICs and p=0.041 for Giomer). Conclusion: Both GIC-based materials were susceptible to erosive wear; however, they promoted the lowest erosive loss of adjacent enamel. Against erosion-abrasion, only Fuji II LC was able to reduce enamel loss. For dentin, none of the materials exhibited a significant protective effect.

scholarly journals Bond strength of a resin composite and a resin-modified glass-ionomer cement associated or not with chlorhexidine to eroded dentin

2015 ◽  
Vol 18 (2) ◽  
pp. 31
Author(s):  
Flavia Pardo Salata Nahsan ◽  
Martha Beteghelli Michielin ◽  
Luciana Mendonça Da Silva ◽  
Camila Moreira Machado ◽  
Andréa Mello De Andrade ◽  
...  
Keyword(s):  
Bond Strength ◽  
Resin Composite ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Acrylic Resin ◽  
Cervical Region ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Prior Application ◽  
Ionomer Cement

<p><strong>Objective</strong>: Even resin composites and glass-ionomer cements are widely used for dental cervical region restorations, under erosive condition they can wear out quickly. This study aimed to compare, by means of bond strength by microshear, the performance of a resin composite (RC) and a resin-modified glass-ionomer cement (RMGIC) to eroded dentin and its association with 2% chlorhexidine up to 6 months. <strong>Material</strong> <strong>and</strong> <strong>Methods</strong>:. Eighty  sound third molars teeth were cutt to obtain flat coronal dentin, which were subsequently embedded in self-curing acrylic resin circular molds exposing only this surface available. Teeth were divided into two groups, according to the treatment with the Adper Single Bond 2 + RC Filtek Z250 (Z) or the RMGIC Vitremer (V). Half of the specimens were immersed in artificial saliva-AS for 24 hours (control groups) and half subjected to 3x/1 minute daily immersion in Regular Coca Cola ®-RC for 5 days. Half of the specimens for each described condition were treated with water and half with 2% chlorhexidine for 1 minute prior the restoration. For all groups, the specimens were stored in artificial saliva weekly renewed up to tests. The bonding strength was evaluated by  microshear test after 1 month and 6 months . Data, in normal distribution, were analyzed with 3-way ANOVA and Tukey (p &lt;0.05). <strong>Results</strong>: Challenge factors, materials and time were statistically significant.. Restorations with Z showed significantly higher bond strength compared to V in all situations. There was a reduction in bond strength values over time for all tested conditions. The prior application of 2% chlorhexidine was able to preserve the Z bond strength between 1 and 6 months, but this factor was not statistically significant. <strong>Conclusion</strong>: For eroded dentin, the use of resin composite seems presents greater bond strength compared to resin-modified glass-material, disregarding their association to chlorhexidine or not.</p>

Use of sonic waves in bubble formation, microhardness and fluoride release of a high‐viscosity glass‐ionomer cement

2019 ◽  
Vol 10 (4) ◽  
Author(s):  
Nallu Gomes Lima Hironaka ◽  
Juliana Quintino Trizzi ◽  
Natália Miwa Yoshida ◽  
Jaime Aparecido Cury ◽  
Cinthia Pereira Machado Tabchoury ◽  
...  
Keyword(s):  
Bubble Formation ◽  
Glass Ionomer Cement ◽  
High Viscosity ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
Sonic Waves ◽  
Ionomer Cement

scholarly journals Flexural Strength of Glass Carbomer Cement and Conventional Glass Ionomer Cement Stored in Different Storage Media over Time

2018 ◽  
Vol 27 (4) ◽  
pp. 372-377 ◽  
Author(s):  
Muhammad Ali Faridi ◽  
Abdul Khabeer ◽  
Saad Haroon
Keyword(s):  
Flexural Strength ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Bending Test ◽  
Glass Ionomer ◽  
Time Intervals ◽  
Storage Media ◽  
Unique Factor ◽  
Post Hoc ◽  
Ionomer Cement

Objectives: Glass ionomer cement (GIC) is routinely placed as a restorative material in dentistry. However, due to its poor physical properties, its use is limited to cases where the level of stress on restoration is minimal. Improved formulations of GIC have been developed to overcome these drawbacks. The purpose of this study was to evaluate flexural strength of a conventional GIC (Fuji IX) against a newly developed glass carbomer cement (GCP). Materials and Methods: For Fuji IX and GCP, a total of 80 blocks were prepared and divided into 16 groups (n = 5). These groups were further categorized according to the storage medium (artificial saliva and Vaseline) and time intervals (24 h and 1, 2, and 4 weeks). A 3-point bending test was carried out, and statistical analysis was done using ANOVA and Tukey post hoc tests. Results: Fuji IX showed a mean flexural strength of 25.14 ± 13.02 versus 24.27 ± 12.57 MPa for GCP. There was no significant statistical difference between both materials when compared under storage media. Both materials showed the highest value for flexural strength at 2 weeks of storage and lowest at 4 weeks. Conclusion: The storage media do not affect the flexural strength of the specimens with reference to time. Time is the unique factor with relative influence on mean resistance to fracture. Further testing is required to evaluate the true potential of the newly developed GCP.

Clinical Performance of Heat-Cured High-Viscosity Glass Ionomer Class II Restorations in Primary Molars: A Preliminary Study

2017 ◽  
Vol 41 (4) ◽  
pp. 264-270 ◽  
Author(s):  
Eliyahu Tal ◽  
Ari Kupietzky ◽  
Anna B Fuks ◽  
Nili Tickotsky ◽  
Moti Moskovitz
Keyword(s):  
Clinical Performance ◽  
Glass Ionomer Cement ◽  
Class Ii ◽  
High Viscosity ◽  
Primary Molars ◽  
Restorative Material ◽  
Glass Ionomer ◽  
Recall Time ◽  
Preliminary Study ◽  
Ionomer Cement

Objectives: The present preliminary study evaluated the clinical and radiographic performances of heat-cured high viscosity glass ionomer (HCHVGI) in class II restorations of primary molars. Study design: A retrospective study on a cohort of patients who had dental caries restored at a private practice was conducted. Restorations were evaluated radiographically and photographically by two separate examiners. Results: Ninety-three Class II restorations in 44 patients (average age: 108 months ± 25.3, 24 males, 20 females) were examined. Average recall time was 22.2 months ± 4.2. All but three restorations (96.8%) were present and intact, with no incidents of secondary caries. Three additional restorations had occlusal defects that required retreatment, resulting in an overall success rate of 93.5%. Ninety-seven percent of the restorations were rated optimal for marginal integrity with no staining of the restoration surfaces. No patients complained of post-operative sensitivity. The most common flaw found was a concavity on the proximal wall of the cavity box (27%, mean age 16 months ± 3.9). Conclusion: The findings in this preliminary study suggest that heat cured high viscosity glass ionomer cement may be an effective restorative material for Class II restorations in primary molars that are a year or two from shedding.

Impact of the Porosity from Incremental and Bulk Resin Composite Filling Techniques on the Biomechanical Performance of Root-Treated Molars

2021 ◽  
Author(s):  
RAS Pereira ◽  
PBF Soares ◽  
AA Bicalho ◽  
LM Barcelos ◽  
LRS Oliveira ◽  
...  
Keyword(s):  
Fracture Mode ◽  
Fracture Resistance ◽  
Composite Resin ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
High Viscosity ◽  
Composite Resins ◽  
Glass Ionomer ◽  
Pulp Chamber ◽  
Ionomer Cement

SUMMARY Objectives: To analyze the effect of the porosity caused by incremental and bulk resin composite filling techniques using low- and high-viscosity composite resins on the biomechanical performance of root-treated molars. Methods: Forty intact molars received standardized mesio-occlusal-distal (MOD) cavity preparation, were root treated, and randomly divided into four groups with different filling techniques (n=10). The first involved two incremental filling techniques using VIT/Z350XT, a nanofilled composite resin (Filtek Z350XT, 3M ESPE) associated with a resinmodified glass ionomer cement, and resin-modified glass ionomer cement (RMGIC; Vitremer, 3M ESPE) for filling the pulp chamber. The second involved TPH/VIT, a microhybrid composite resin TPH3 Spectrum associated with Vitremer. The third and fourth involved two bulk-fill composite resins: SDR/TPH, a low-viscosity resin composite (Surefill SDR flow, Dentsply) associated with TPH3 Spectrum, and POST, a high-viscosity bulkfill resin composite (Filtek Bulk Fill Posterior, 3M ESPE). The volume of the porosity inside the restoration was calculated by micro-CT. The cusp deformation caused by polymerization shrinkage was calculated using the strain-gauge and micro-CT methods. The cusp deformation was also calculated during 100 N occlusal loading and loading to fracture. The fracture resistance and fracture mode were recorded. Data were analyzed by one-way analysis of variance and Tukey test. The fracture mode was analyzed by the χ2 test. The volume of the porosity was correlated with the cusp deformation, fracture resistance, and fracture mode (α=0.05). Results: Incremental filling techniques associated with RMGIC resulted in a significantly higher porosity than that of both bulk-fill techniques. However, no significant difference was found among the groups for the fracture resistance, fracture mode, and cusp deformation, regardless of the measurement time and method used. No correlation was observed between the volume of the porosity and all tested parameters. Conclusions: The porosity of the restorations had no influence on the cuspal deformation, fracture resistance, or fracture mode. The use of the RMGIC for filling the pulp chamber associated with incremental composite resins resulted in similar biomechanical performance to that of the flowable or regular paste bulk-fill composite resin restorations of root-treated molars.

A One-Year Clinical Evaluation of a High-Viscosity Glass Ionomer Cement in Primary Molars

2006 ◽  
Vol 7 (1) ◽  
pp. 71-78 ◽  
Author(s):  
Yucel Yilmaz ◽  
Özge Eyuboglu ◽  
Mutlu Elcin Kocogullari ◽  
Nihal Belduz
Keyword(s):  
Clinical Evaluation ◽  
Glass Ionomer Cement ◽  
Class Ii ◽  
High Viscosity ◽  
Class I ◽  
Primary Molars ◽  
Glass Ionomer ◽  
Significant Difference ◽  
One Year ◽  
Ionomer Cement

Abstract In this study one-year clinical results of high-viscosity glass ionomer cement (GIC) (Fuji IX, A3, GC, Japan) were determined in class I and class II restorations in 68 primary molars with occlusal or approximal caries. Following caries removal and cavity preparation, the teeth were restored with Fuji IX. The restorations were evaluated according to the U.S. Public Health Service's (USPHS) criteria at the end of one year. Statistical analyses of the data obtained were analyzed using the X2 test. The evaluations showed no statistically significant difference between class I and class II restorations in terms of the color mismatch, anatomic form, marginal adaptation, and secondary caries (P>0.05), but they were statistically significant with regard to cavosurface marginal discoloration (P<0.05). At the end of one year, the success rate of the class I and class II restorations of the primary molars restored with Fuji IX was 94%. Citation Yilmaz Y, Eyuboglu Ö, Kocogullari ME, Belduz M. A One-Year Clinical Evaluation of a High-Viscosity Glass Ionomer Cement in Primary Molars. J Contemp Dent Pract 2006 February;(7)1:071-078.

scholarly journals A Twofold Comparison between Dual Cure Resin Modified Cement and Glass Ionomer Cement for Orthodontic Band Cementation

2016 ◽  
Vol 4 (4) ◽  
pp. 695-699
Author(s):  
Hanaa El Attar ◽  
Omnia Elhiny ◽  
Ghada Salem ◽  
Ahmed Abdelrahman ◽  
Mazen Attia
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Acrylic Resin ◽  
Resin Cement ◽  
Materials Testing ◽  
Glass Ionomer ◽  
Ionomer Cement ◽  
Modified Resin

AIM: To test the solubility of dual cure resin modified resin cement in a food simulating solution and the shear bond strength compared to conventional Glass ionomer cement.MATERIALS AND METHOD: The materials tested were self-adhesive dual cure resin modified cement and Glass Ionomer (GIC). Twenty Teflon moulds were divided into two groups of tens. The first group was injected and packed with the modified resin cement, the second group was packed with GIC. To test the solubility, each mould was weighed before and after being placed in an analytical reagent for 30 days. The solubility was measured as the difference between the initial and final drying mass. To measure the Shear bond strength, 20 freshly extracted wisdom teeth were equally divided into two groups and embedded in self-cure acrylic resin. Four mm sections of stainless steel bands were cemented to the exposed buccal surfaces of teeth under a constant load of 500 g. Shear bond strength was measured using a computer controlled materials testing machine and the load required to deband the samples was recorded in Newtons.RESULTS: GIC showed significantly higher mean weight loss and an insignificant lower Shear bond strength, compared to dual cure resin Cement.CONCLUSION: It was found that dual cure resin modified cement was less soluble than glass ionomer cement and of comparable bond strength rendering it more useful clinically for orthodontic band cementation.

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