جستجوی مقالات مرتبط با کلیدواژه « fluoride » در نشریات گروه « پزشکی »

This study aimed to evaluate the efficacy of "Embrace WetBond", a fluoride-releasing self-adhesive resin cement in preventing the development of white spot lesions (WSLs) during orthodontic treatment. This retrospective cross-sectional study was conducted on the dental records of 140 patients treated with fixed orthodontic appliances in a private orthodontic clinic in Tehran, Iran. Patients were divided into two equal groups based on the type of adhesive used for bonding orthodontic attachments: Group 1 (control), Transbond XT and Group 2,  Embrace wetBond. The prevalence and severity of WSLs were assessed in all teeth from the first molar to the first molar of both jaws using post-treatment photographs. The data were analyzed by chi-square and Mann-Whitney U test and a P-value<0.05 was considered statistically significant. The prevalence and severity of WSLs were significantly lower in the Embrace WetBond group compared to the Transbond XT group (P=0.02 and P=0.003). The difference in WSL prevalence between the maxilla and mandible was insignificant within each group (P>0.05). The highest prevalence of WSLs was in maxillary lateral incisors (21.4%) and mandibular first molars (15.7%) in the Transbond XT group and maxillary lateral incisors (7.1%) in the WetBond group. The findings of this study suggest that Embrace WetBond adhesive may effectively reduce the risk of WSL development in patients treated with fixed orthodontic appliances. This fluoride-releasing self-adhesive resin cement can be considered a suitable alternative to traditional cement in orthodontic practice.

The purpose of this study was to investigate the effect of adding CPP-ACP into a daily-use toothpaste on the remineralization of enamel caries lesions. Thirty enamel blocks were obtained from bovine incisors. Each specimen was divided into three equal parts. One-third of each block was coated with varnish to serve as a sound control area, while the remaining two-thirds underwent a demineralization process. After demineralization, another one-third of the surface was varnished, leaving only one-third of the enamel to undergo remineralization. The enamel blocks were divided into three groups (n=10), according to the remineralization treatment applied as follows: Group 1: fluoride-containing toothpaste, Group 2: CPP-ACP-containing toothpaste, and Group 3: fluoride- and CPP–ACP–containing toothpaste.  Remineralization was assessed through the Vickers microhardness test at various depths (20, 50, 120 and 200 µm). The data were analyzed by ANOVA and LSD test, and P< 0.05 was considered statistically significant. There was a significant difference in remineralization efficacy between the groups at the depth of 20 µm (P 0.001). Pairwise comparisons revealed that the toothpaste containing both fluoride and CPP-ACP had a significantly greater microhardness than other experimental groups (P 0.05). No significant difference was observed between the study groups concerning microhardness at 50, 120 and 200 µm depths (P 0.05). CPP-ACP can serve as a suitable alternative to fluoride in daily-use toothpaste for enamel remineralization. The concurrent use of fluoride and CPP-ACP in toothpaste can generate a synergistic remineralizing effect at the enamel surface layer.

Considering the therapeutic properties of the compounds used in Albodent Iranian toothpaste and little evidence about the effect of NovaMin toothpaste on primary caries lesions, the purpose of this research was to compare the effect of toothpaste containing fluoride and toothpaste containing bioactive glass with Albodent toothpaste on enamel remineralization in a laboratory manner.

Overall, 24 healthy human premolar teeth were selected and divided into buccal and lingual halves. The demineralization cycle of the samples was performed for 14 days. The samples were classified into four groups and were brushed twice a day for 28 days with tested toothpaste. A microhardness test was conducted, and changes in the enamel surface and morphology of one sample selected from each group were evaluated by scanning electron microscopy. The analysis of variance and Tukey’s tests were used for the statistical analysis of the data.

The average difference in microhardness in the studied groups was statistically significant (P<0.05) when compared two-by-two with the control group. The most noticeable difference was found in the comparison of the Sensodyne group with the control group, while the lowest difference was observed in the comparison of the Albodent group with the control group.

The presence of NovaMin in toothpaste along with fluoride can increase the efficiency of the remineralization rate of primary enamel lesions compared to fluoride toothpaste without bioactive glass. In addition, the effectiveness of herbal toothpastes, which do not contain essential artificial ingredients in the remineralization of primary enamel lesions was lower than that of non-herbal fluoride toothpastes.

Fluoride can arrest dental caries and prevent its progression. The most important advantage of fluoride is that there is no need for cavity preparation; in this respect, it eliminates the utilization of air motors. Furthermore, it provides a good choice for younger children without cooperation ability and patients requiring special care. This study aimed to review the literature about fluoride and to advise public health specialists about the types of fluoride and that fluoride is still a right and safe choice in the COVID-19 pandemic.

Through a search in electronic databases containing Medline, Scopus, Web of Science, and PubMed, a total of one hundred forty-two systematic reviews and original articles in the period of 2008-2021 were selected. The following keywords were used: pediatric dentistry, coronavirus, oral health, tooth remineralization, COVID-19, fluoride, dental fluorosis, and preventive dentistry.

Data from selected papers was extracted and classified to evaluate the importance of fluoride in the prevention of dental caries. Fluoride has been selected as a good choice for the prevention and control of dental caries during the coronavirus pandemic.

The research has focused on increasing the awareness of public health specialists, advising them that any type of fluoride use is expedient and safe during the COVID-19 pandemic.

Fluoride is currently accessible in various forms, including water, toothpaste, mouth rinses, and professional fluoride therapy at dental clinics. A body of data supports the use of systemic and topical fluoride from various sources to prevent dental caries. Fluoride ions are absorbed by the enamel before tooth eruption and produce fluorohydroxyapatite, which is more resistant to acid attack than hydroxyapatite crystals [1]. Fluoride ions also aid in the early caries lesion remineralization process. As a result of the two mechanisms outlined above, fluoride strengthens enamel teeth against organic acids and dental caries.

Smart ion-releasing restorative materials may increase the success and survival rate of composite dental restorations. This study aimed to evaluate the impact of sintering temperature on the mechanical properties and ion-releasing behavior of fluorohydroxyapatite (FHA)-filled dental resin composites. The FHA was synthesized via a sol-gel method and sintered at three temperatures (250, 500, and 1000ºC). FHA fillers were characterized using X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy, then coated with citric acid and incorporated (40% w/w) into a photo-curable resin matrix (Bis-GMA, TEGDMA, HEMA; weight ratio 2:1:1). Flexural strength (FS) and diametral tensile strength (DTS) were measured, as well as the depth of cure, which was determined by the Vickers microhardness test. The release of calcium and fluoride ions was monitored for a month in diluted citric acid (pH=4.3), and the effect of acidic storage on mechanical properties was evaluated via DTS testing. The filler distribution was observed via scanning electron microscopy. The influence of sintering temperature on the measured variables was statistically analyzed using one-way and two-way ANOVA (α=0.05). The XRD results revealed increased crystallinity with higher sintering temperatures. Correspondingly, mechanical properties improved with increasing sintering temperature (P<0.05), whereas the depth of cure, as well as ion release (Ca+2 and F-), decreased (P<0.05). Sintering at elevated temperatures yielded a greater amount of crystalline apatite structure, and enhanced mechanical properties of FHA-filled dental resin composites, but reduced ion release. Based on these findings, FHA fillers sintered at approximately 500ºC appear optimal for creating smart dental resin composite. (J Dent Mater Tech 2023;12(2):(82-90)

This study aimed to assess the remineralization of shallow and deep artificial white spot lesion (WSL) by the application of three fluoride releasing varnishes.

Sixty-four extracted premolars were subjected to acid attack inducing two depths of WSLs. Using a DIAGNOdent pen, teeth were divided into two groups according to the WSL depth: shallow enamel (SE) and deep enamel (DE). Then each was subdivided into four intervention groups of eight teeth each: MI varnish, Clinpro White varnish, Clinpro XT, or control (artificial saliva). Laser fluorescence were measured via DIAGNOdent pen at baseline, demineralization stage, 24 h, 4 weeks, and 8 weeks after intervention.

For each lesion depth, there were statistically significant differences among the agents after intervention (P < 0.01) and among time intervals for each group (P < 0.01).

MI varnish is more effective than Clinpro White varnish or Clinpro XT in remineralizing two depths of WSLs at different time points.

Drinking fluoride-contaminated water is a severe health hazard problem. Fluorosis -both skeletal and dental- is an important clinical and public health problem in about 24 countries including India. The best method to overcome the problem of excess fluoride in drinking water is defluoridation. Adsorption methods are simple, economical, and globally pursued techniques. Thirst-quenching herbal products locally called ‘Dahashamini’ are plant parts that are used during boiling drinking water. Possessing a defluoridation potential is an added benefit.

Two grams of each of dried and ground Zingiber officinale, Elettaria cardamomum, Eugenia caryophyllus, Coriandrum sativum, Acacia catechu, Caesalpinia sapans, Vetiveria zizanioides, Cuminum cyminum, and Hemidesmus indicus, were added to 100 millilitres of fluoridated water of baseline concentrations of 5 and 10 ppm, boiled till its boiling point, and cooled. The samples were then filtered and analyzed for fluoride content using fluoride ion specific electrode method. Statistical analysis was done using one-way ANOVA, followed by Tukey’s post hoc test for pair-wise comparison.

Caesalpinia sapans, Vetiveria zizanioides, Acacia catechu, Eugenia caryophyllus, and Coriandrum sativum, had a significant ability to adsorb fluoride from fluoridated water, with an efficiency ranging from 12% to 56% (at a baseline concentration of 10 ppm) and 19% to 82% (at a baseline concentration of 5 ppm).

The study indicates the possibility of the use of five ingredients in developing a costeffective and acceptable method of defluoridation based on the adsorption method.

 Enamel microabrasion can eliminate enamel irregularities and discoloration. This study evaluated the staining susceptibility of enamel after microabrasion using different clinical protocols.

 A total of 210 extracted bovine incisors were used in this study. The teeth were randomly divided into five groups of 42 teeth each (n=42), including group 1: control (no treatment), group 2: microabrasion, group 3: microabrasion + fluoride polishing, group 4: macroabrasion (fine-grit diamond bur) + microabrasion, and group 5: macroabrasion (finegrit diamond bur) + microabrasion + fluoride polishing. The groups were then randomly divided into two subgroups for discoloration procedures: coffee and distilled water (n=21). A spectrophotometric evaluation was carried out at baseline and on the 1st, 7th, 14th, and 28th days of the staining period. Statistical analyses were performed using repeated-measures ANOVA and the post hoc Bonferroni test at a significance level of 0.05.

 The greatest color change was observed in group 2 specimens, which were immersed in coffee solutions. The color change values for groups 3, 4, and 5 specimens, which were immersed in distilled water, were higher than those in group 1 specimens (P<0.05). The fluoride polishing + enamel microabrasion treatment groups (groups 3 and 5) exhibited greater resistance to color changes than the matched non-fluoride-polished groups (groups 2 and 4) (P<0.05).

The teeth that underwent enamel microabrasion treatment and were polished with fluoride gel became more resistant to color changes. Our findings confirm that enamel microabrasion treatment is a conservative method for localized discoloration.

Statement of the Problem:

 Every effort for increasing the calcium concentration in the saliva would be beneficial for prevention of dental caries. Regarding this issue, the natural products could be considered safer and more cost effective. Sesame is rich in calcium but the data about the effect of sesame on enamel roughness is inadequate.

This study aimed to assess the effect of an experimental sesame gel on the surface roughness of human enamel by using atomic force microscopy (AFM).

In the current experimental study, fifteen enamel slices with 1mm thickness were prepared. They were polished and acid etched to produce a substantial rough surface prior to the first AFM analysis. The enamel blocks were randomly divided into three groups treated with distilled water, fluoride gel, and an experimental prepared sesame gel correspondingly. The treating agent was applied for 3minutes at 0, 8, 24, and 48h intervals and washed by distilled water after each cycles. Ultimately, the final AFM micrographs were prepared. The statistical analysis was performed using paired t-test, one-way ANOVA, and Tukey Post Hoc tests (a=0.05).

Statistical analysis revealed that the surface roughness was significantly reduced in both sesame and fluoride groups (p= 0.017 and 0.018, respectively) while the control group (distilled water) were not noticeably changed (p= 0.12). The control group had statistically significant difference with both the sesame and the fluoride groups (p= 0.007 and 0.007, respectively) while the there was no significance difference between sesame and fluoride groups (p= 0.997). 

Following demineralization by acid etched process, the sesame gel significantly reduced surface roughness of enamel and its effect was similar to fluoride gel.

The aim of the present study is to compare the antibacterial effect of fluoride mouth rinse and fluoride varnish on the primary biofilm formation of Streptococcus mutans (S. mutans) in two types of orthodontic adhesives.

This is an in vitro study in which forty composite discs of Transbond XT and Lightbond were divided randomly into 4 groups: Group 1: Control group (not treated with fluoride), Group 2: Rinsed by 0.2% fluoride mouth rinse, Group 3: Rinsed by 0.05% fluoride mouth rinse, and Group 4: Treated by varnish fluoride. Then each group was placed in S. mutans suspension. Bacterial suspension from each treatment was subcultured onto the surface of Mueller–Hinton agar plates, and bacterial growth was assessed. The results were analyzed by analysis of variance test and Scheffé test was run to compute the binary groups (P < 0.05).

There was a statistically significant reduction in the viability of S. mutans in treated groups by fluoride but no significant difference between two types of composites.

The results of this study demonstrated that S. mutans colonies were sensitive to fluoride and their most effective form was varnish. There was no significant difference in early biofilm formation of S. mutans in two types of orthodontic adhesive resins Transbond XT and Lightbond.

Al-Ce-Mn oxide samples were synthesized by the cathodic electrochemical method at current densities of 5, 15, and 35 mAcm-2. The XRD, SEM, and EDX techniques were used for the characterization of samples. The SEM images show that at high current density the one-dimensional(nanowire) structure and at low current density two-dimensional (nanosheet) structure were obtained. Moreover, the particle sizes are decreased with increasing the current density. The samples were applied for the uptake of fluorine (F-) ions from solutions. The influence of the contact time, initial fluoride concentration, and solution pH on the adsorption was investigated. The results showed more than 80 % of F-  ions were uptake from solution during the three hours initial contact times and the uptake capacity has little change at pH below 6 and it has a sharp decline with increasing solution pH. The kinetic data were well fitted to the pseudo-second-order model and the equilibrium adsorption data was well described by the Langmuir isotherm model.  The adsorption capacity was 48 mg/g at pH 6 and room temperature.