scholarly journals Evaluation of calcium release and pH value of light-cured cavity liners for pulp-capping materials

2018 ◽  
Vol 47 (4) ◽  
pp. 205-209
Author(s):  
Kamila de Figueiredo PEREIRA ◽  
Rosymere Freitas de Sousa CRUVINEL ◽  
Andrea Abi Rached DANTAS ◽  
Milton Carlos KUGA
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Release ◽  
Ph Value ◽  
Distilled Water ◽  
High Solubility ◽  
Pulp Capping ◽  
Tukey Test ◽  
Ph Values ◽  
Low Strength

Abstract Introduction Cavity liners based calcium hydroxide present low strength and high solubility that is consider a disadvantage. In order to enhance these properties it was developed a light-cured cavity liner based calcium hydroxide containing resin. Objective The purpose of this study was to evaluate the pH and calcium release of light-cured cavity liners. Material and method There were prepared specimens (n=10) with the Ultra-Blend ® plus, Biocal® (light cured cements) and Hydro C® (control). The samples were stored in 10 mL of distilled water and maintained at 37 °C. After 24 hours, 7, and 14 days, there were analyzed pH and the release of calcium levels. The data were statistically analyzed by ANOVA and Tukey test (α = 0.05). Result The results of pH showed Hydro C > Ultra-Blend plus > Biocal. Biocal presented worst calcium release. Conclusion Light-cured materials present lower calcium release and alteration in pH values.

scholarly journals The Influence of Dentine on the pH of Calcium Hydroxide, Chlorhexidine Gel, and Experimental Bioactive Glass-Based Root Canal Medicament

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Ceci Nunes Carvalho ◽  
Laila Gonzales Freire ◽  
Alexandre Pinheiro Lima de Carvalho ◽  
Evandro Luiz Siqueira ◽  
José Bauer ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Statistical Difference ◽  
External Solution ◽  
Deionized Water ◽  
Distilled Water ◽  
Time Points ◽  
Tukey Test ◽  
Ph Values ◽  
The Mean ◽  
Chlorhexidine Gel

Objectives. To evaluate the influence of dentine on the pH of different medications in standardized simulated canals.Materials and Methods. Forty resin blocks were divided into groups with and without dentine powder, as follows: 2% chlorhexidine gel; 2% chlorhexidine gel associated with calcium hydroxide PA; calcium hydroxide PA delivered in propylene glycol 600; and NPG delivered in distilled water. The dentine powder was obtained from the root dentine of bovine teeth and added to the medications. The simulated canals were placed in containers with 1.5 mL of deionized water and pH was monitored in multiple intervals, up to 30 days. The mean pH values were calculated and submitted to statistical analysis using paired Student’st-test and ANOVA complemented by the Tukey test (p<0.05).Results. There was no statistical difference between the groups with and without dentine powder (p>0.05). The pH values of calcium hydroxide were significantly higher than those of NPG in the first 24 hours (p<0.05). After 7 days, both behaved in a similar manner.Conclusion. The addition of dentine powder to the medications evaluated did not alter the pH of the external solution in any of the time points tested.

scholarly journals Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex

2012 ◽  
Vol 3 (2) ◽  
pp. 180-183
Author(s):  
Marcelo Ferrarezi de Andrade ◽  
Renato de Toledo Leonardo ◽  
Edson Alves de Campos ◽  
Milton Carlos Kuga ◽  
Marco Antonio Hungaro Duarte ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Release ◽  
Ph Value ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Ph Values ◽  
The One ◽  
Physical And Chemical ◽  
The Impact ◽  
And Chemical Properties

ABSTRACT Objective This study evaluated the flow, pH and calcium release of MTA Fillapex (G1) or Fillapex plus 10% in weight of calcium hydroxide powder (G2), compared to AH Plus (G3) and Sealapex (G4). Materials and methods The flow test was performed according to ISO 6876:2001 requirements. The sealers were placed into plastic tubes and immersed in deionized water. After 24 hours, 7, 14 and 28 days, the water of each tube was removed and tested to evaluate the pH values and the level of released calcium. Calcium release values were analyzed statistically by Kruskal Wallis and Dunn tests and pH values analyzed by ANOVA and Tukey tests (α = 5%). Results G1 presented higher flow among all sealers. The addition of 10% calcium hydroxide into MTA Fillapex reduced the flow (p < 0.05) but, in a level, that is lower than the one recommended for ISO norms. G2 and G4 presented pH values and calcium release higher than G3 (p < 0.05) in all periods. G1 presented pH value higher than G3 (p < 0.05), except in 7 days period (p > 0.05). G4 presented higher pH values than G1 and G2, but the calcium release was similar for all periods (p > 0.05). G3 presented lower calcium release among all groups (p < 0.05). Conclusion The addition of 10% calcium hydroxide in MTA Fillapex caused reduction in flow and no negative interference in pH and/or calcium release. However, the obtained flow is different from ISO requirements. Clinical relevance MTA Fillapex presents levels of flow above the ISO norms. The addition of calcium hydroxide is a suggestion for solving this problem, but the impact of these procedures should be carefully evaluated. How to cite this article Keine KC, Guiotti FA, Leonardo RT, Kuga MC, Duarte MAH, de Campos EA, de Andrade MF. Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex. World J Dent 2012;3(2):180-183.

scholarly journals Alkalizing potential and calcium release of residues from intracanal dressing containing calcium hydroxide

2018 ◽  
Vol 47 (6) ◽  
pp. 383-387
Author(s):  
Mariana Pires CRESPO ◽  
Kamila de Figueiredo PEREIRA ◽  
Milton Carlos KUGA ◽  
Thiago Soares PORTO ◽  
Luciana ARMADA
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Ions ◽  
Root Canal ◽  
Calcium Release ◽  
Ph Value ◽  
Positive Control ◽  
Positive Control Group ◽  
Control Group ◽  
Distilled Water ◽  
Significant Difference

Abstract Introduction If the restoration, that seal the root canal from oral environment, failed or solubilize, the intracanal dressing could be partially removed, decreasing the efficiency of calcium hydroxide (CH). Objective To evaluate the alkalizing potential and calcium ions release of intracanal residues from different medications, in different periods. Materials and method Human incisors were endodontically instrumented and randomly divided (n=10). The root canals were filled with: G1⎯Calcium hydroxide (CH); G2⎯CH with 0.4% chlorhexidine digluconate (CHC); G3⎯CH with camphorated paramonochlorophenol and glycerin (HPG); G4⎯CH was maintained during all experiment, as positive control group (PC) and G5⎯ No medication was performed in the negative control group (NC). The specimens were immersed in distilled water for 7 days. The intracanal dressing was removed from the experimental groups using F1 instrument (Protaper). The teeth were stored in distilled water for 24 hours, 7, 14 and 28 days. pH value and calcium ions released were evaluated and the data were submitted to ANOVA one-way and Tukey tests. Result All experimental groups presented lower alkalizing potential and calcium ions release than PC (P<0.05). No significant difference was found among the experimental groups, regardless of the period (P>0.05). Conclusion The alkalizing potential and calcium ions release of residues from different intracanal dressing, in different periods, were similar and lower than the positive control group, that the medication was maintained inside the root canal, encouraging the replacement of intracanal dressing when the restoration fail.

scholarly journals Effect of calcium chloride on the pH values of several formulations of calcium hydroxide mixed with chlorhexidine digluconate

2013 ◽  
Vol 1 (4) ◽  
pp. 344
Author(s):  
Hemanoely Marins-de-Azevedo ◽  
Rodrigo Vargas Conti Montenario ◽  
Mariana Pires Crespo ◽  
Milton Carlos Kuga ◽  
Camila Almeida Nascimento
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Chloride ◽  
Ph Value ◽  
Distilled Water ◽  
Chlorhexidine Digluconate ◽  
Ph Values ◽  
Term Analysis

This study evaluated the effect of the addition of 5% calcium chlorite (CaCl2) on pH values in calcium hydroxide pastes (CH), with or without 2% chlorhexidine digluconate (CHX) used as vehicle, in several periods analysis. Polyethylene tubes were filled with CH mixed with water (G1), 2% CHX solution (G2) or gel (G3), or CHX solution  or gel with 5% CaCl2 (G4 and G5, respectively). All tubes were individually immersed in distilled water. After 12, 24 hours, 7, 14 and 28 days, pH value was evaluated directly in water which the tubes were stored. Data were submitted to ANOVA and Tukey tests (α=0.05). In 24 hs and 14 days, pH values were similar to all groups. In 12 hs, the G1 presented lower pH value than other groups except to G4 (p < 0.05), and G4 presented lower pH value than G5 (p < 0.05). In 7 days, G1 presented lower pH value than G4 and G5 (p < 0.05). In 28 days, G1 and G5 presented lower pH values than G2 and G4 (p < 0.05) and among other groups there are no statistical differences (p > 0.05). The pH values increased in long-term analysis to all CH pastes. The association of 5% calcium chloride with 2% CHX solution as vehicle of CH paste provided a pH value increase in relation to CH mixed with distilled water. The CHX gel interfered negatively on pH value in comparison to CHX solution when mixed with CaCl2.

scholarly journals Evaluation of the pH, calcium release and antibacterial activity of MTA Fillapex

2013 ◽  
Vol 42 (5) ◽  
pp. 330-335 ◽  
Author(s):  
Milton Carlos Kuga ◽  
Gisele Faria ◽  
Paulo Henrique Weckwerth ◽  
Marco Antonio Hungaro Duarte ◽  
Edson Alves De Campos ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Calcium Release ◽  
Ph Value ◽  
Diffusion Test ◽  
Evaluation Period ◽  
Ph Values ◽  
Agar Diffusion Test ◽  
Ah Plus ◽  
Endodontic Sealers ◽  
And Staphylococcus Aureus

OBJECTIVE: This study evaluated, in several analysis periods, pH and calcium release and antibacterial activity provided by MTA Fillapex sealer compared to Sealapex and AH Plus sealers. MATERIAL AND METHOD: Polyethylene tubes were filled with a sealer and immersed in distilled water. After 24 hours, 14 and 28 days, pH and calcium release by endodontic sealers were evaluated directly in water which the tubes were stored. Sealers antibacterial activity was evaluated against Enterococcus faecalis and Staphylococcus aureus by means of agar diffusion test. All data were submitted to ANOVA and Tukey tests (α=0.05). RESULT: In all periods evaluated, Sealapex had the highest pH value (p<0.05) in comparison to other sealers and MTA Fillapex provided higher pH values than AH Plus (p<0.05). In 14-days period, MTA Fillapex had greater calcium release value than Sealapex (p<0.05). In 28-days period, Sealapex provided higher calcium release than MTA Fillapex (p<0.05). In all periods, AH Plus provided lower calcium release than other sealers (p<0.05). In relation to E. faecalis, there were no differences among the sealers, in relation to antibacterial activity (p>0.05). In relation to S. aureus, Sealapex presented better antibacterial effectiveness than the MTA Fillapex and AH Plus (p<0.05), which were similar each other (p>0.05). CONCLUSION: In final evaluation period, pH values and calcium release provided by MTA Fillapex were lower than provided by Sealapex and higher than provided by AH Plus. The MTA Fillapex antimicrobial action was similar to other endodontic sealers.

scholarly journals Effects of coronal leakage on concentration of hydrogen ions and calcium release of several calcium hydroxide pastes over different periods of time

2013 ◽  
Vol 1 (3) ◽  
pp. 230
Author(s):  
Mariana Pires Crespo ◽  
Milton Carlos Kuga ◽  
Marcus Vinicius Reis Só ◽  
Katia Cristina Keine ◽  
André Luis Shinohara
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Release ◽  
Water Concentration ◽  
Positive Control ◽  
Negative Control ◽  
Distilled Water ◽  
Filling Material ◽  
Hydrogen Ions ◽  
Ion Release ◽  
Temporary Filling

PURPOSE: To evaluate the effects of coronal leakage on concentration of hydrogen ions (pH) and calcium release of several calcium hydroxide pastes, over different periods of time. MATERIAL AND METHODS:  Fifty extracted human mandibular central incisors (n=10) were instrumented up to the F2 instrument and assigned to the following intracanal dressing: G1- Calen, G2- Calen with 0.4% chlorhexidine (CHX), G3- Calcium hydroxide with camphorated paramonochlorophenol (CPMC) and glycerin, G4- Calen, but temporary filling material maintained during all test (positive control) and G5- Root canal without intracanal dressing (negative control). All groups were immersed in distilled water for 7 days. In sequence, the temporary filling materials were removed, except in controls groups. All specimens were individually mounted on a specific device and only its root again immersed in distilled water. Concentration of hydrogen ions and calcium release by calcium hydroxide pastes in distilled water were evaluated in 24h, 7, 14 and 28 days. The results were submitted to ANOVA test (p = 0.05). After 28 days, root canals from experimental groups were examined in SEM. RESULTS: G1, G2, G3 and G4 presented similar pH values and calcium release and did not differ from each other (p>0.05), up to 7 days. After this time G1, G2 and G3 presented values lower values than G4 (p<0.05). In SEM analysis, calcium hydroxide residues were observed in all experimental groups. CONCLUSIONS: After 7 days, coronal leakage decreased the concentration of hydrogen ions and calcium ion release provided by all calcium hydroxide pastes.

The Coagulability of Partially Lysed Fibrinogen Effect of pH and Ionic Strength

1971 ◽  
Vol 25 (02) ◽  
pp. 346-353 ◽  
Author(s):  
D. C Triantaphyllopoulos ◽  
Mary Torres
Keyword(s):  
Ionic Strength ◽  
Human Plasma ◽  
Ammonium Sulfate ◽  
Inverse Relationship ◽  
Ph Value ◽  
Distilled Water ◽  
Human Fibrinogen ◽  
Ph Values ◽  
Ph Dependent ◽  
Limited Digestion

SummaryAddition of thrombin to plasma obtained from dogs injected with plasmin clotted more fibrinogen when the plasma was diluted with saline than when it was diluted with distilled water. In contrast, more fibrin was formed in dilutions with distilled water when thrombin was added to intact plasma obtained prior to the injection of plasmin.The same phenomenon was observed with purified human fibrinogen submitted to limited digestion with plasmin and was found to be pH dependent. When the pH was greater than 7.3 more fibrin was formed if the fibrinogen was diluted with saline than if it was diluted with distilled water. The opposite was observed at pH values lower than 7.2.Similar results were obtained with the fraction of partially lysed human fibrinogen which precipitates at 25% saturation with ammonium sulfate. The same fraction, however, obtained from partially digested bovine fibrinogen did not react exactly the same way. In dilutions with distilled water there was an inverse relationship between the pH value and the amount of protein which clotted; but the reverse did not apply to the same extent in dilutions with saline.At variance to the above observations the clottability of purified intact fibrinogen was not significantly altered by changes in pH or in ionic strength.The clottability of partially lysed human plasma could be reversed (more fibrin in distilled water than in saline) after exhaustive dialysis against oxalated (pH 7.0) but not against citrated (pH 7.8) saline indicating that the change in clottability was due to a change in pH.

scholarly journals Glycerol Salicylate-based Pulp-Capping Material Containing Portland Cement

2015 ◽  
Vol 26 (4) ◽  
pp. 357-362 ◽  
Author(s):  
Fernando Freitas Portella ◽  
Fabrício Mezzomo Collares ◽  
Paula Dapper Santos ◽  
Cláudia Sartori ◽  
Everton Wegner ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Portland Cement ◽  
Calcium Hydroxide ◽  
Water Sorption ◽  
Methyl Salicylate ◽  
Distilled Water ◽  
Pulp Capping ◽  
Lower Solubility ◽  
Before And After ◽  
And Diffusion

<p>The purpose of this study was to evaluate the water sorption, solubility, pH and ability to diffuse into dentin of a glycerol salicylate-based, pulp-capping cement in comparison to a conventional calcium hydroxide-based pulp capping material (Hydcal). An experimental cement was developed containing 60% glycerol salicylate resin, 10% methyl salicylate, 25% calcium hydroxide and 5% Portland cement. Water sorption and solubility were determined based on mass changes in the samples before and after the immersion in distilled water for 7 days. Material discs were stored in distilled water for 24 h, 7 days and 28 days, and a digital pHmeter was used to measure the pH of water. The cement's ability to diffuse into bovine dentin was assessed by Raman spectroscopy. The glycerol salicylate-based cement presented higher water sorption and lower solubility than Hydcal. The pH of water used to store the samples increased for both cements, reaching 12.59±0.06 and 12.54±0.05 after 7 days, for Hydcal and glycerol salicylate-based cements, respectively. Both cements were able to turn alkaline the medium at 24 h and sustain its alkalinity after 28 days. Hydcal exhibited an intense diffusion into dentin up to 40 µm deep, and the glycerol salicylate-based cement penetrated 20 µm. The experimental glycerol salicylate-based cement presents good sorption, solubility, ability to alkalize the surrounding tissues and diffusion into dentin to be used as pulp capping material.</p>

scholarly journals Erosive potential of sugar-free hard candies dissolved in water and artificial saliva

2016 ◽  
Vol 15 (1) ◽  
pp. 75
Author(s):  
Maria Mercês Aquino Gouveia Farias ◽  
Magatha Marquetti Lazzaris de Oliveira ◽  
Beatriz Helena Eger Schmitt ◽  
Eliane Garcia da Silveira ◽  
Silvana Marchiori de Araújo
Keyword(s):  
Artificial Saliva ◽  
Titratable Acidity ◽  
Glass Electrode ◽  
Distilled Water ◽  
Lemon Balm ◽  
Significance Level ◽  
Tukey Test ◽  
Ph Values ◽  
Three Samples ◽  
Two Samples

Aim: To compare the acidity of sugar-free hard candies dissolved in water and artificial saliva. Methods: Sugar-free Flopi Florestal hard candies (grape, strawberry, cherry, orange, ginger, lemon balm, fennel) were selected and grouped in 2 groups: G-1 (candies dissolved in distilled water) and G-2 (candies dissolved in artificial saliva). Candies were triturated with a porcelain pestle, yielding two samples of 20 g. Samples were dissolved in 120 mL distilled water (G-1) and 120 mL artificial saliva (20 mM NaHCO3, 3 mM NaH2PO4.H2O and 1 mM CaCl2.2H2O) (G-2), obtaining three samples of 30 mL for each of the flavors and groups. pH was measured using potentiometer and combined glass electrode. Titratable acidity was evaluated by adding 100 μL 1M NaOH aliquots until reaching pH 5.5. For statistical analysis, analysis of variance (ANOVA) was used. Means were compared by the Tukey test at 5% significance level (p<0.05) Results: All flavors of G-1 showed pH values below 5.5. Comparison of groups in the same flavor showed a significant increase in pH in flavors of G-2. Comparison of the titratable acidity between G-1 and G-2, showed that fruit flavors were significantly different from each other, with reduced acidity in G-2. Conclusions: All evaluated candies are acid, and dilution in artificial saliva raised their pH and lowered their titratable acidity, reducing their erosive potential.

Effect of Storage Conditions on Biaxial Flexure Strengths of MTA

2008 ◽  
Vol 396-398 ◽  
pp. 429-432
Author(s):  
Hideo Sato ◽  
Naoko Kubota ◽  
Seiji Ban ◽  
Youichi Yamasaki
Keyword(s):  
Ph Value ◽  
Mineral Trioxide Aggregate ◽  
Storage Conditions ◽  
Flexure Strength ◽  
Liner Material ◽  
Pulp Capping ◽  
Ph Values ◽  
Dental Pulp Capping ◽  
Flexure Test ◽  
Biaxial Flexure

The aim of this study was to determine the biaxial flexure strength of a commercially available dental pulp capping or cavity liner material, mineral trioxide aggregate (MTA). MTA and a conventional pulp capping material, calcium hydroxide, were used in this study. Each material was prepared into a disk-shaped specimen. Those specimens were stored in 100% humidity atmosphere at 23 or 37°C for 3 or 24 h. Six specimens in each condition were used for the biaxial flexure test using a piston-on-three-ball according to ISO-6872. Surface pH values were determined. The biaxial flexure strengths of MTA after setting in 24h were larger than those of Dycal (p <0.01). pH value of MTA was higher than that of Dycal. These results indicated that MTA was clinically usage material.

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