Effect Of Fluoride Solutions Research Articles

Effect of fluoride solution on salivary amylase activity

Fluoride has the benefit on the tooth to inhibit caries. Fluoride is systemically incorporated into the crystal lattice of enamel by exchanging positions with the hydroxyl ion to result in formation of fluorapatite. Fluoride used locally may inhibit tooth demineralization, one of the mechanism is that fluoride is suspected to inhibit salivary amylase activity.The aim of this research is to exam whether fluoride inhibits salivary amylase activity and at what concentration.Method of this research was experimental research and the design was "The posttest only control group design". The samples were taken from patients with criteria: man or woman, 13-20 years old, in fit condition, no salivary gland disorder, no caries, no gingivitis. Saliva was collected from samples fasted in the night, and asked to brush their teeth without using toothpaste. This experiment used iodium to detect the color reaction. The method also used NaF with several concentrations in saliva.The result of this experiment indicated that almost all groups have a statistically significant differences salivary amylase activity (p<0,05), except between the group without NaF and with 1 mM NaF and 2 mM NaF, betweenl mM NaF and 2 mM NaF, between 2 mM NaF dan 5 mM NaF, between 5 mM NaF and 10 mM NaF (p>0,05).Conclusion of this research found that NaF was found to inhibit the salivary amylase activity when the fluoride concentration was at and above 5 mM.

Effect of fluoride solutions on color and surface roughness of dental composites

Objective: The aim of this study was to assess the ac- tion of fluoride solutions on color stability (∆E) and surface roughness (Ra) of composites (Heliomolar, 4 SeasonsTM, Tetric N-CeramTM, SR AdoroTM). Materials and method: A Teflon matrix (12x2 mm) was used to fabricate 24 test specimens for each composite. The samples were separated into 4 groups (n=6), according to the immersion solution: distilled water (control), acidulated phosphate fluoride (1.23%), neutral sodium fluoride gel (2%), and solution of sodium fluoride (0.05%). Color (Spectrophotometer PCB 6807) and roughness (Surf- corder SE 1700) readings were performed before and after immersion into the solutions. Results: Composites presented color alteration within clinically acceptable limits (ΔE 0.2 µm). Conclusions: Color and surface roughness alteration of the different composites was clinically acceptable after immersion in all fluoride solutions and in all periods. Keywords: Composite resins. Color. Surface properties. Acidulated phosphate fluoride.

Effect of fluoride solutions on the shear bond strength of orthodontic brackets

The aim of this in vitro study was to evaluate the shear bond strength of brackets after pre-treatment with different fluoride solutions. This study used 48 freshly extracted sound bovine incisors that were randomly assigned to 4 experimental groups (n=12). CG: (control) without treatment; NF: 4 min application of neutral fluoride; APF: application of 1.23% acidulated phosphate fluoride (APF) for 4 min; and SFV: application of 5% sodium fluoride varnish for 6 h. For each group, after surface treatment, prophylaxis of enamel and bracket bonding with Transbond XT composite resin (3M) were performed following the manufacturer's specifications. The shear bond strength was performed with a universal testing machine 24 h after fixing the brackets. The tooth surfaces were analyzed to verify the adhesive remnant index (ARI). Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). There was statistically significant difference among the groups (p<0.0001). CG and NF groups presented significantly higher bond strength than APF and SFV. There was no significant difference between CG and NF or between APF and SFV (p>0.05). The analysis of ARI scores revealed that most failures occurred at the enamel-resin interface. It may be concluded that the pre-treatment of enamel with 1.23% APF and 5% SFV prior to fixing orthodontic brackets reduces shear bond strength values.