scholarly journals Evaluation of Corrosive Behavior of Four Nickel–chromium Alloys in Artificial Saliva by Cyclic Polarization Test:An in vitro Study

2017 ◽  
Vol 8 (6) ◽  
pp. 477-482 ◽  
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Vitro Study ◽  
Cyclic Polarization ◽  
Nickel Chromium ◽  
Chromium Alloys

scholarly journals Physicochemical Characteristics of Arginine Enriched NaF Varnish: An In Vitro Study

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2998
Author(s):  
Mohammed Nadeem Bijle ◽  
Manikandan Ekambaram ◽  
Edward Lo ◽  
Cynthia Yiu
Keyword(s):  
Molecular Dynamics ◽  
Physical Properties ◽  
Artificial Saliva ◽  
Chemical Properties ◽  
In Vitro Study ◽  
Physicochemical Characteristics ◽  
Vitro Study ◽  
Physical And Chemical ◽  
Stable Matrix

The in vitro study objectives were to investigate the effect of arginine (Arg) incorporation in a 5% sodium fluoride (NaF) varnish on its physical and chemical properties including F/Arg release. Six experimental formulations were prepared with L-arginine (L-Arg) and L-arginine monohydrochloride at 2%, 4%, and 8% w/v in a 5% NaF varnish, which served as a control. The varnishes were subjected to assessments for adhesion, viscosity, and NaF extraction. Molecular dynamics were simulated to identify post-dynamics total energy for NaF=Arg/Arg>NaF/Arg<NaF concentrations. The Arg/F varnish release profiles were determined in polyacrylic lactate buffer (pH-4.5; 7 days) and artificial saliva (pH-7; 1 h, 24 h, and 12 weeks). Incorporation of L-Arg in NaF varnish significantly influences physical properties ameliorating retention (p < 0.001). L-Arg in NaF varnish institutes the Arg-F complex. Molecular dynamics suggests that NaF>Arg concentration denotes the stabilized environment compared to NaF<Arg (p < 0.001). The 2% Arg-NaF exhibits periodic perennial Arg/F release and shows significantly higher integrated mean F release than NaF (p < 0.001). Incorporating 2% L-arginine in 5% NaF varnish improves its physical properties and renders a stable matrix with enduring higher F/Arg release than control.

scholarly journals Effect of topical fluoride on microshear bond strength of primary enamel to composite, microhardness of enamel and its surface morphology: An in vitro study

2019 ◽  
Vol 13 (4) ◽  
pp. 305-310
Author(s):  
Mina Biria ◽  
Sajedeh Namaei Ghasemi ◽  
Seyedeh Mahsa Sheikh-Al-Eslamian ◽  
Narges Panahandeh
Keyword(s):  
Bond Strength ◽  
Artificial Saliva ◽  
Morphological Characteristics ◽  
In Vitro Study ◽  
Vitro Study ◽  
Control Group ◽  
Modes Of Failure ◽  
Group 3 ◽  
Microshear Bond Strength

Background. This in vitro study aimed to evaluate the microshear bond strength (μSBS), microhardness and morphological characteristics of primary enamel after treating with sodium fluoride (NaF) and acidulated phosphate fluoride (APF). Methods. Forty-eight primary canines were cut into mesial and distal sections and assigned to five groups randomly: group 1 (immersed in saliva as a control), group 2 (treated with NAF and immersed in saliva for 30 minutes), group 3 (treated with APF and immersed in saliva for 30 minutes), group 4 (treated with NAF and immersed in saliva for 10 days), and group 5 (treated with APF and immersed in saliva for 10 days). Composite resin (Filtek Z250) was bonded on the specimens (n=15) for measuring the μSBS. After storage in 37°C artificial saliva for 24 hours, µSBS and Vickers hardness tests (10 readings) were performed. The data were analyzed using one-way ANOVA and Kolmogorov-Smirnov, Levene’s and Tukey HSD tests (P<0.05). Morphological analysis of enamel and modes of failure were carried out under a scanning electron microscope (SEM) on two remaining specimens. Results. Significant differences in μSBS were only noted between groups 2 and 4 (P=0.024). Group 3 showed a significant decrease in hardness after storage in artificial saliva (P<0.001), with a significantly lower hardness than the other groups (P<0.001). The SEM observations showed irregular particles in groups 3 and 5; uniform, smooth and thin coats were seen in groups 2 and 4. Conclusion. Fluoride therapy with NaF and APF gels prior to restorative treatments had no adverse effects on the microshear bond strength.

scholarly journals An In Vitro Study of the Effect of Fluoridated Milk on Oral Bacterial Biofilms

2000 ◽  
Vol 66 (4) ◽  
pp. 1720-1723 ◽  
Author(s):  
J. Pratten ◽  
R. Bedi ◽  
M. Wilson
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Vitro Study ◽  
Bacterial Biofilms ◽  
Dental Plaques

ABSTRACT Microcosmic dental plaques were grown in artificial saliva and supplemented with either milk or fluoridated milk. The presence of fluoride in the milk increased the pH of the biofilms and reduced the proportions of streptococci, demonstrating that in this model, fluoridation of milk produces biofilms with reduced cariogenic potential.

Elastomeric chain force decay in artificial saliva: An in vitro study

2013 ◽  
Vol 11 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Abdelali Halimi ◽  
Mohamed-Faouzi Azeroual ◽  
Anas Doukkali ◽  
Khalid El Mabrouk ◽  
Fatima Zaoui
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Vitro Study ◽  
Force Decay ◽  
Chain Force

scholarly journals Migration of fluoride ions from the permanent teeth into saliva in children with glass ionomer cement restorations: An in vitro study

2013 ◽  
Vol 70 (3) ◽  
pp. 279-283
Author(s):  
Mirjana Apostolovic ◽  
Biljana Kalicanin ◽  
Marija Igic ◽  
Olivera Trickovic-Janjic ◽  
Dusan Surdilovic ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
Fluorine Content ◽  
In Vitro Study ◽  
Vitro Study ◽  
Permanent Teeth ◽  
Glass Ionomer ◽  
Fluoride Solution ◽  
Low Concentration ◽  
Significant Difference

Bacground/Aim. Glass ionomer cements (GIC) belong to the group of polycarboxyl cements, and one of the principal characteristics of these materials is their anticariogenic potential of fluorine release into saliva and enamel-dentin substance. The aim of this study was to examine the content of released fluorine from GIC restorations (Fuji IX, GC, Japan) of young permanent teeth in the medium of artificial saliva and similar releases in the same medium by the restorations of these teeth treated with a low concentration fluoride solution. Methods. We examined 12 premolars exctracted from orthodontic reasons. The GIC restored teeth were divided into the group treated daily with low concentration fluoride solution (334 ppm) and the control, not treated group. The samples of artificial saliva were analyzed for fluorine ion content using an ion selective electrode. Results. Our comparative analysis of the mean values using the Student?s t-test demonstrated a statistically significant difference in fluorine ion concentration in artificial saliva of fluoridated and non-fluoridated teeth with GIC fillings after 14 and 21 days (p < 0.05), while the difference detected after 7 days was with no statistical significance. Conclusion. The results of this in vitro study indicated that low-concentration fluoride solutions could serve to refluoridate GIC fillings and contribute to an increased fluorine content in saliva. The process of refluoridation of GIC fillings should be advised 2-3 weeks after the restoration, since the release of fluorine from GIC fillings diminishes in time.

scholarly journals Effect of Acidic Challenge Preceded by Food Consumption on Enamel Erosion

2010 ◽  
Vol 04 (04) ◽  
pp. 412-417 ◽  
Author(s):  
Heitor Marques Honório ◽  
Daniela Rios ◽  
Edmêr Silvestre Pereira Júnior ◽  
Daniela Silva Barroso de Oliveira ◽  
Fernanda Alves Fior ◽  
...  
Keyword(s):  
Food Consumption ◽  
Liver Extract ◽  
Artificial Saliva ◽  
In Vitro Study ◽  
Vitro Study ◽  
Food Extract ◽  
Effect Of Food ◽  
Enamel Erosion ◽  
Erosive Effect

Objectives: This in vitro study aimed to evaluate the effect of food consumption followed by acidic challenge on enamel erosion.Methods: Seventy-five enamel blocks obtained from bovine teeth were divided randomly into five groups (n=15 per group): GI – erosion with previous immersion in milk; GII – erosion with previous immersion in cheese extract; GIII – erosion with previous immersion in liver extract; GIV – erosion with previous immersion in broccoli extract; and GV – erosive effect of cola drink (control). Over 24 h, the slabs were submitted to 3 pH-cycles, each consisting of immersion in the studied food (GI to GIV) for 5 min followed by immersion in a cola drink for 5 min, and subsequently, the slabs were stored in artificial saliva (110 min). At the end of the pH-cycles, the slabs were stored in artificial saliva for 18 h. Enamel alterations were assessed by profilometry (μm). Data were tested using ANOVA and Scott-Knott’s tests (P<.05).Results: Mean erosion depths for enamel (μm) were 0.46 in GI, 0.55 in GII, 0.64 in GIII, 0.54 in GIV, and 1.18 in GVI. Enamel loss by acidic challenge alone (GV) was significantly higher than when the acidic challenges were preceded by food extract immersion.Conclusions: The data suggest that all studied foods could minimize the erosive effect on enamel. (Eur J Dent 2010;4:412-417)

Enamel Apperance after Orthodontic Attachment Removal. In vitro SEM analysis

2017 ◽  
Vol 68 (1) ◽  
pp. 125-127
Author(s):  
Alexandrina Muntean ◽  
Anca Stefania Mesaros ◽  
Anca Porumb ◽  
Stanca Cuc ◽  
Marioara Moldovan ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Sem Analysis ◽  
Point Of View ◽  
Vitro Study ◽  
Enamel Surface ◽  
Surface Appearance ◽  
Adhesive Remnant Index ◽  
Materials Used

The aim of this in vitro study was to assess the enamel surface appearance and Adhesive Remnant Index (ARI) after braces removal. On teeth vestibular surfaces 90 braces were bonded as follows: metallic, ceramics respectively sapphire using as bonding material Opal Seal� (Ultradent, SUA). Teeth were divided in 3 groups (N=30) and stored for 3 months in artificial saliva, tea and Coca-Cola�. For teeth stored in tea and Coca Cola�, ARI express lower values, indicating a risk for enamel injury as fracture occurs at adhesive-enamel interface. From practical point of view, this in vitro study enhance that braces detachment, finishing and polishing are risk manoeuvres for enamel surface. Materials used for collage must present specific properties in order to reduce enamel fracture.

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