scholarly journals Effects of Temperature on the Fluoride Release and Recharging Ability of Glass Ionomers

10.2341/06-36 ◽  
2007 ◽  
Vol 32 (2) ◽  
pp. 138-143 ◽  
Author(s):  
Z. Yan ◽  
S. K. Sidhu ◽  
G. A. Mahmoud ◽  
T. E. Carrick ◽  
J. F. McCabe
Keyword(s):  
Clinical Relevance ◽  
Fluoride Release ◽  
Environment Temperature ◽  
Oral Environment ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
Topical Fluoride

Clinical Relevance The use of a higher temperature during topical fluoride applications may increase the fluoride recharging and re-release ability of glass ionomers, and a low oral environment temperature should be avoided during topical fluoride application.

scholarly journals Effect of pH on the Wettability and Fluoride Release of an Ion-releasing Resin Composite

2008 ◽  
Vol 33 (5) ◽  
pp. 571-578 ◽  
Author(s):  
F. M. Namen ◽  
J. Galan ◽  
G. De Deus ◽  
R. D. Cabreira ◽  
F. C. S. Filho
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Fluoride Release ◽  
Effect Of Ph ◽  
Oral Environment

Clinical Relevance The effect of pH on the wettability and fluoride release of Ariston pHc was examined. It was determined that this material might interfere with plaque adhesion in the oral environment.

scholarly journals Achieving Efficient and Stable Deammonification at LowTemperatures—Experimental and Modeling Studies

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3961
Author(s):  
Hussein Al-Hazmi ◽  
Xi Lu ◽  
Dominika Grubba ◽  
Joanna Majtacz ◽  
Przemysław Kowal ◽  
...  
Keyword(s):  
Sequencing Batch Reactor ◽  
Energy Savings ◽  
Batch Reactor ◽  
Phase Changes ◽  
Intermittent Aeration ◽  
Short Term ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
The Mathematical Model ◽  
Positive Effect

The short-term effects of temperature on deammonification sludge were evaluated in a laboratory-scale sequencing batch reactor (SBR). Mathematical modeling was used for further evaluations of different intermittent aeration strategies for achieving high and stable deammonification performance at decreasing temperatures. As for the biomass cultivated at high temperatures (e.g., 30 °C), a higher temperature dependency (the adjusted Arrhenius coefficient θ for 11–17 °C = 1.71 vs. θ for 17–30 °C = 1.12) on the specific anammox growth rates was found at lower temperatures (11–17 °C) in comparison with higher temperatures (17–30 °C). Further evaluations of recovering the nitrogen removal efficiency at decreasing temperatures with the mathematical model by modifying the intermittent aeration strategies (aeration frequency (F) and the ratio (R) between non-aerated (non-aer) phase and aerated (aer) phase durations) indicated that intermittent aeration with a prolonged non-aerated phase (e.g., R ≥ 4 regardless of F value) would help to maintain high and stable deammonification performance (~80%) at decreasing temperatures (14–22 °C). Extending the non-aerated phases (increasing R) and reducing the frequency (F) of off/on phase changes have a positive effect on increasing energy savings, leading to increasing interest in this method.

Oral Fluoride Levels 1 h after Use of a Sodium Fluoride Rinse: Effect of Sodium Lauryl Sulfate

2015 ◽  
Vol 49 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Gerald L. Vogel ◽  
Gary E. Schumacher ◽  
Laurence C. Chow ◽  
Livia M.A. Tenuta
Keyword(s):  
Sodium Fluoride ◽  
Sodium Lauryl Sulfate ◽  
Lauryl Sulfate ◽  
Fluoride Release ◽  
Important Goal ◽  
Oral Fluids ◽  
Surrogate Measure ◽  
Significant Change ◽  
Topical Fluoride

Increasing the concentration of free fluoride in oral fluids is an important goal in the use of topical fluoride agents. Although sodium lauryl sulfate (SLS) is a common dentifrice ingredient, the influence of this ion on plaque fluid and salivary fluid fluoride has not been examined. The purpose of this study was to investigate the effect of SLS on these parameters and to examine the effect of this ion on total (or whole) plaque fluoride, an important source of plaque fluid fluoride after a sufficient interval following fluoride administration, and on total salivary fluoride, a parameter often used as a surrogate measure of salivary fluid fluoride. Ten subjects accumulated plaque for 48 h before rinsing with a 12 mmol/l NaF (228 µg/g F) rinse containing or not containing 0.5% (w/w) SLS. SLS had no statistically significant effect on total plaque and total saliva fluoride but significantly increased salivary fluid and plaque fluid fluoride (by 147 and 205%, respectively). These results suggest that the nonfluoride components of topical agents can be manipulated to improve the fluoride release characteristics from oral fluoride reservoirs and that statistically significant change may be observed in plaque fluid and salivary fluid fluoride concentrations that may not be observed in total plaque and total saliva fluoride concentrations.

The Self-Decay Characteristics of Chlorine Dioxide in Water

2012 ◽  
Vol 610-613 ◽  
pp. 296-299
Author(s):  
Xin Jie Li ◽  
Dan Nan Jiang ◽  
Yue Jun Zhang
Keyword(s):  
Rate Constants ◽  
Tap Water ◽  
Pure Water ◽  
Decay Behaviour ◽  
Increase With Increase ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
Lower Temperature ◽  
Kinetics Of ◽  
Temperature Water

In order to learn the ClO2 decay behaviour in tap water, the kinetics of ClO2 decay in pure water was studied. Under the conditions of tap water treatment and keeping away from light, the effects of temperature and pH on ClO2 degradation were investigated. The results show that the ClO2 decay reaction in pure water is the first-order with respect to ClO2, the decay rate constants increase with increase in temperature or pH. At pH=6.87, the rate constants are 0.012h-1(15°C), 0.017h-1(25°C), 0.023h-1(35°C), and 0.029h-1(45°C), respectively. At 25°C, the rate constants are 0.0083h-1(pH=4.5), 0.0111h-1(pH=5.5), 0.0143h-1(pH=6.5), 0.0222h-1(pH=7.5), and 0.0351h-1(pH=8.5), respectively. The experimental data prove that ClO2 is more stable in acidic or lower temperature water than in neutral, alkalescent, or higher temperature water.

Self-Assembly of Alkali Lignin in Tetrahydrofuran

2012 ◽  
Vol 550-553 ◽  
pp. 57-61
Author(s):  
Hao Li ◽  
Yong Hong Deng ◽  
Kai Huang
Keyword(s):  
Charge Transfer ◽  
Electrostatic Interaction ◽  
Self Assembly ◽  
The Self ◽  
Charge Transfer Complexes ◽  
Layer By Layer ◽  
Alkali Lignin ◽  
Higher Temperature ◽  
Effects Of Temperature

Alkali lignin (AL) was used as a polyanion to form layer-by-layer self-assembled film with PDAC as a polycation. The effects of temperature and concentration on the adsorption characteristics of AL were investigated. Iodine was added into AL solutions to study the role of π-π interaction in self-assembly of AL and PDAC. Results show that the self-assembly of AL/PDAC is mainly driven by π-π interaction and electrostatic interaction. A higher temperature or a larger concentration can enhance the aggregation of lignin. I2 can form lignin–iodine charge–transfer complexes with AL to reduce the degree of aggregation of AL, so the adsorbed amount of AL decreases significantly with increasing iodine contents.

Study on Engineering-Material Properties and Influences of Incubated Temperatures on Soil Carbon Decomposition

2013 ◽  
Vol 675 ◽  
pp. 280-283
Author(s):  
Qiu Xiang Tian ◽  
Hong Bo He ◽  
Xu Dong Zhang
Keyword(s):  
Soil Carbon ◽  
Temperature Sensitivity ◽  
Carbon Materials ◽  
Thermal Adaptation ◽  
Soil Environment ◽  
Carbon Decomposition ◽  
Environment Temperature ◽  
Carbon Release ◽  
Higher Temperature ◽  
Lower Temperature

The mineralization of soil carbon materials potentially alters carbon release from soil and the atmospheric carbon concentration in engineering. Despite this central role in the decomposition of soil carbon materials, few studies have been conducted on how climate warming affects this carbon emissions and then response in return back. To study this, five soils were incubated in 5, 15, 25 °C for one month. Soil shifted to warming condition slowed down the increasing rate of decomposition causing by higher temperature. Furthermore, raising the soil environment temperature to 25 °C weakened the temperature sensitivity of the decomposition of these carbon materials, and the temperature sensitivity enhanced at lower temperature. This “thermal adaptation” of carbon material would potentially slow down carbon loss which accelerated by climate change technically.

Evaluation and Comparison of Quantity and Pattern of Fluoride release from Orthodontic Adhesives: An in vitro Study

2014 ◽  
Vol 15 (1) ◽  
pp. 99-102 ◽  
Author(s):  
Devatha Ashok Babu ◽  
Sanjay Krishna Sriram ◽  
Ravindra Reddy Regalla ◽  
Chandulal Jadav ◽  
Roopa Rani S Sriram
Keyword(s):  
Orthodontic Treatment ◽  
Control Group ◽  
Base Line ◽  
Fluoride Release ◽  
Group Iii ◽  
Orthodontic Adhesives ◽  
Group I ◽  
Group Ii ◽  
Topical Fluoride

ABSTRACT Background Orthodontic treatment has gained popularity since beginning of era of dentistry. Now a day, everyone is conscious about their appearance, smile and function. During orthodontic treatment use of brackets and adhesives are common. The bonding of brackets will cause demineralization which requires the fluoridation. So the study has been undertaken to analyze the pattern of fluoride release by commercially available adhesive bonding material for the prevention of demineralization. Aim To evaluate and compare the clinical significance of quantity and pattern of fluoride release from three commercially available adhesives. Objectives To assess the pattern of fluoride release and quantity, to reduce the decalcification of enamel around orthodontic brackets and bands during treatment and to prevent further use of topical fluoride both office and self-use agents for prevention of demineralization/for remineralization. Materials and methods The comparison of quantity and pattern of fluoride release study involved commercially available bonding adhesives. They are: Group I—resin reinforced glass Ionomer light cure material (OrthoLC), Group II—fluoride releasing composite resin material (Excel) and Group III— conventional composite (Relay-a-bond) evaluated on 78 freshly extracted premolar teeth divided into three groups consisting 26 specimens in each group. The prepared specimens were stored in artificial saliva at 37°C in an incubator for subsequent fluoride analysis using ORION ion selective electrode coupled with ionalyzer 901. Fluoride analysis made at 24 hours intervals for first 3 consecutive days and thereafter at the end of 10th, 17th, 24th and 31st day of bonding. The data obtained were tabulated and interpreted by statistical analysis using ‘t’ test and one-way analysis of variance (ANOVA). Observations and Results The quantity of fluoride release in groups I and II was significant even at the end of 31st day. The one-way AVOVA showed intra and inter group significance in the quantity of fluoride release. But group III with zero fluoride release with significant decalcification on enamel which requires external use of topical fluorides. The pattern of fluoride released was 3.06 ppm for group I and 2.01 ppm for group II and was declined sharply after 24 hours; and continued to decline in subsequent weeks. Mean quantity of fluoride release by group I was 15.08 ppm were as group II was 9.02 ppm over the test period of 31 days. At the end of 31st day the group I bonding adhesive was releasing considerable amount of fluoride compared to group II whereas group III was nil. At all the periods inter and intra group mean values were highly significant. And group III acted as base line or control group as it was non fluoride releasing material. Conclusion Both the fluoride releasing adhesive bond material are useful to reduce the risk of demineralization and further prevent the usage of topical fluoride application and reduce cost and clinical visiting time for both patient and clinician. How to cite this article Regalla RR, Jadav C, Babu DA, Sriram RRS, Sriram SK, Kattimani VS. Evaluation and Comparison of Quantity and Pattern of Fluoride release from Orthodontic Adhesives: An in vitro Study. J Contemp Dent Pract 2014;15(1):99-102.

Larval growth in three sympatric Ambystoma salamander species: species differences and the effects of temperature

1984 ◽  
Vol 62 (6) ◽  
pp. 1043-1047 ◽  
Author(s):  
W. Hubert Keen ◽  
Joseph Travis ◽  
John Juilianna
Keyword(s):  
Growth Rate ◽  
Predator Avoidance ◽  
Species Differences ◽  
Larval Growth ◽  
Ambystoma Tigrinum ◽  
Close Proximity ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
Behavioral Mechanisms ◽  
Salamander Species

Differences in the larval growth of three Ambystoma salamander species that breed in close proximity to each other in space and time in north Florida were investigated under standardized regimes of controlled food levels and temperature. The order of species growth rates was as follows: Ambystoma tigrinum > A. talpoideum > A. opacum. This order is exactly the reverse of the order in which the species breed. Growth of A. talpoideum larvae was strongly dependent on temperature, whereas A. opacum larval growth was only weakly affected by temperature. Based on these growth rate differences, it is unlikely that A. talpoideum larvae could survive to metamorphosis without special behavioral mechanisms for predator avoidance in habitats with the rapidly growing predatory A. tigrinum larvae. Furthermore, A. opacum larvae would be favored in their growth over those of A. talpoideum at low temperature, while the reverse would be true at higher temperature.

EFFECTS OF TEMPERATURE ON THE STABILITY OF PROTONEUTRON STARS WITH HYPERONS

2012 ◽  
Vol 27 (02) ◽  
pp. 1250008 ◽  
Author(s):  
ZI YU ◽  
WENBO DING ◽  
NINGNING LIU ◽  
QING LUO
Keyword(s):  
Mean Field Theory ◽  
Mean Field ◽  
Mass Range ◽  
Relativistic Mean Field ◽  
Sn 1987A ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
The Stability ◽  
Protoneutron Stars ◽  
Protoneutron Star

In the framework of the relativistic mean field theory, the stability of thermal protoneutron stars is investigated. There is a highest possible temperature for a stable protoneutron star. A stable protoneutron star may be a metastable one if its mass is too large. As the temperature increases, the metastable mass range of protoneutron stars narrows. With the increase of temperature, the probability that a stable protoneutron star is a metastable one increases. A really stable protoneutron star with higher temperature can contain more species of hyperons. The case of SN 1987A is analyzed connected with the results in this article.

scholarly journals Comparison of Surface Roughness of Two Restorative Materials after the Application of Topical Fluorides

2018 ◽  
Vol 1 (11) ◽  
pp. 339-342
Author(s):  
Saru Khosla ◽  
Vaibhav Verma ◽  
Sheena Markan
Keyword(s):  
Surface Roughness ◽  
Artificial Saliva ◽  
Tooth Surface ◽  
Restorative Material ◽  
Protective Function ◽  
Roughened Surface ◽  
Oral Environment ◽  
Restorative Materials ◽  
Topical Fluoride ◽  
Topical Fluorides

INTRODUCTION: Surface roughness and microhardness are the two important properties which provide compressive strength as well as abrasion resistance to the restorative materials. On the other side topical fluorides provide the protective function with its anti-cariogenic properties. GIC as a restorative material fulfills both of the requirements.AIM: The aim of this study is to evaluate the effect of topical fluoride application on surface roughness of various restorative materials.MATERIALS AND METHODS: This study was done on 20 extracted teeth, Conventional Glass Ionomers (Fuji II) and Resin Modified Glass Ionomers (3M ESPE Vitremer) were used as restorative materials. Topical fluoride application i.e. with 2% sodium fluoride using Knutson’s technique was done followed by storing in artificial saliva for 24 hours and then blot dried for testing of surface roughness.RESULTS: Through this study it was observed that the no statistical difference was found between both of the restorative materials. (P>0.05).CONCLUSION: In oral environment strength and life span of restorative material is one of the important criteria and roughened surface can clinically deteriorate these properties of restoration. So it’s important for a dentist to consider all the factors while applying and restoring the tooth surface.

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