scholarly journals THE EFFECTIVENESS OF COMPOMER AND GIC AGAINST PREVENTION IN ENAMEL DEMINERALIZATION

2021 ◽  
Vol 6 (2) ◽  
pp. 205
Author(s):  
Fadil Abdillah Arifin ◽  
Yustisia Puspitasari ◽  
Nur Rahmah Hasanuddin ◽  
M. Fajrin Wijaya ◽  
Sari Aldilawaty
Keyword(s):  
Antimicrobial Effect ◽  
Control Group ◽  
Lesion Depth ◽  
Tukey Test ◽  
Enamel Demineralization ◽  
Restorative Materials ◽  
Ph Cycling ◽  
And Control ◽  
Demineralization Prevention ◽  
Scanning Electron

Background: Several studies showed that fluoride interferes in the dynamics involved in the development of caries and could present an antimicrobial effect or provide demineralization inhibition or dental remineralization. The development of fluoride-releasing materials can contribute to a preventive of demineralization. GIC and Compomer are restorative materials containing fluoride which can prevent demineralization. Purpose: To analyze the effectiveness of Compomer and GIC against prevention in enamel demineralization. Method: The cavities were made on 18 bovine teeth which grouped into 3 groups, each group consisting of 6 bovine teeth. After the restorative procedures, the teeth were submitted to demineralization and remineralization cycling during 14 days. The sections of the teeth were examined under scanning electron microscope after undergoing pH cycling. The data were analyzed using the Kruskal-Wallis and Tukey Test (p<0.05). Results: GIC group showed the lowest lesion depth of demineralization (10.9883 ± 0.74333) followed by Compomer group (25.4183 ± 3.44268) and Control group (88.9783 ± 3.02495). Conclusion: GIC restorative materials have a better enamel demineralization prevention effect than Compomer. Keywords: compomer, demineralization, fluoride, GIC, remineralization

The Potential of a Bioactive, Pre-reacted, Glass-Ionomer Filler Resin Composite to Inhibit the Demineralization of Enamel in Vitro

2021 ◽  
Vol 46 (1) ◽  
pp. E11-E20
Author(s):  
IF Leão ◽  
N Araújo ◽  
CK Scotti ◽  
RFL Mondelli ◽  
MM de Amoêdo Campos Velo ◽  
...  
Keyword(s):  
Resin Composite ◽  
Surface Hardness ◽  
Composition Analysis ◽  
Glass Ionomer ◽  
Material Interface ◽  
Enamel Demineralization ◽  
Restorative Materials ◽  
Ph Cycling ◽  
Group B

Clinical Relevance A prereacted, glass-ionomer filler fluoride-containing resin composite had lower remineralization potential than glass-ionomer cements but was able to inhibit enamel demineralization; thus, it may be an option for restoring dental surfaces for patients at high risk of caries. SUMMARY Evidence is lacking on the use of surface prereacted glass-ionomer filler resin composites to inhibit demineralization and that simulate real clinical conditions. The present laboratory study evaluated the potential of such composites to prevent demineralization and quantified fluoride (F) and other ions released from restorative materials after a dynamic pH-cycling regimen applied to the tooth material interface in vitro. The pH-cycling regimen was assessed by measuring surface hardness (SH) along with energy dispersive X-ray spectroscopy (EDX). Methods and Materials: Ninety blocks of bovine enamel were subjected to composition analysis with EDX, and were further categorized based on SH. The blocks were randomly divided into 6 treatment groups (n=15 each): F IX (Fuji IX Extra; GC Corporation); IZ (Ion Z, FGM); F II (Fuji II LC, GC Corporation); B II (Beautifil II, Shofu); F250 (Filtek Z250 XT, 3M ESPE); and NT (control, no treatment). The blocks were subjected to a dynamic pH-cycling regimen at 37°C for 7 days concurrently with daily alternations of immersion in demineralizing/remineralizing solutions. EDX was conducted and a final SH was determined at standard distances from the restorative materials (150, 300, and 400 μm). Results: The EDX findings revealed a significant increase in F concentration and a decrease in Ca2+ in the enamel blocks of group B II after the pH-cycling regimen (p&lt;0.05). SH values for groups F IX, IZ, and F II were greater than those for groups B II, F250, and NT at all distances from the materials. Conclusions: The results suggest that each of 3 restorative materials, F IX, IZ, and F II, partially inhibited enamel demineralization under a dynamic pH-cycling regimen.

scholarly journals Technology for obtaining an ultrathin posterior lamellar corneal graft at the Eye Tissue Bank

2020 ◽  
Vol 22 (3) ◽  
pp. 167-173
Author(s):  
A. K. Ahmedov ◽  
T. Z. Kerimov ◽  
Kh. D. Tonaeva ◽  
B. E. Malygin ◽  
S. A. Borzenok
Keyword(s):  
Experimental Studies ◽  
Tissue Bank ◽  
Corneal Graft ◽  
Control Group ◽  
Eye Banks ◽  
Preoperative Stage ◽  
Cutting Out ◽  
Stromal Collagen ◽  
And Control ◽  
Scanning Electron

Objective: to develop technologies for preoperative preparation of the posterior lamellar corneal graft based on our own formulation of the preservation medium for optimal dehydration of the donor cornea and a technique for cutting out an ultrathin flap using an optimized method at the Eye Tissue Bank. Materials methods. In a series of experimental studies, we obtained data on the hydration level of cadaveric donor corneas that were preserved in various solutions at different observation periods. Using 16 corneas, analytical weighing and pachymetry were performed via optical coherence tomography in the experimental (n = 8) and control (n = 8) groups. Morphological and functional characteristics of the corneal endothelium were then assessed. At the next stage of work, ultrathin grafts were formed from 16 corneas after hypothermic preservation in the experimental (n = 8) and control (n = 8) solutions by single-pass microkeratome, followed by microscopy of the samples using a scanning electron microscope. Results. After the first days of preservation in the proposed solution, there was dehydration of 9% cornea in the experimental group in comparison with the samples of the control group. After 4 days of preservation, there was no reliable difference found between the groups (p > 0.05) in the study of the endothelial cell viability of ultra-thin corneal grafts by immunofluorescent microscopy using the «Live and dead» marker. Scanning electron microscopy revealed that corneal stromal collagen fibers, preserved in the proposed medium, retained their integrity. Conclusion. The proposed technology can be recommended for use at eye banks for formation of an ultra-thin corneal graft at the preoperative stage.

Effect of Bur Roughness on Bond to Sclerotic Dentin With Self-etch Adhesive Systems

2013 ◽  
Vol 38 (1) ◽  
pp. 39-47 ◽  
Author(s):  
IV Luque-Martinez ◽  
A Mena-Serrano ◽  
MA Muñoz ◽  
V Hass ◽  
A Reis ◽  
...  
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Relative Number ◽  
Control Group ◽  
Adhesive Systems ◽  
Tukey Test ◽  
Tensile Forces ◽  
Adhesive Application ◽  
Self Etch ◽  
Scanning Electron

ABSTRACT Purpose: To evaluate the effect of bur roughness on bond strength values and conditioner pattern of two-step self-etch adhesives applied on sclerotic dentin. Methods: The roots of 48 bovine incisors were removed and the crowns were divided into four groups: the control group (CO) teeth were left untreated or the teeth were slightly roughened with coarse-, medium-, or fine-grit diamond burs. Next, the teeth were subdivided and Clearfil SE Bond (CSE) and Adper SE Bond (ASE) were applied according to the manufacturers' instructions. Composite resin (Opallis) buildups were incrementally constructed on the bonded surfaces. After storage for 24 hours in distilled water at 37°C, the teeth were sectioned into sticks (area of 0.8 mm2). The sticks were stressed until failure by tensile forces (0.5 mm/min). Additionally, eight bovine teeth were treated as previously described, and after adhesive application, the surface was rinsed off and examined by scanning electron microscopy to measure the relative number of open tubules (OT). Data (MPa) were analyzed by two-way analysis of variance and Tukey test (p=0.05). Results: CO showed the highest bond strength values (p&lt;0.05). As regards OT, the lowest mean was observed for CO (p&lt;0.05) and the highest was found after application of CSE or ASE (p&lt;0.05).

scholarly journals Assessment of the Effect of Acid and Base Cycling on Mechanical Properties of Various Esthetic Restorative Materials

2021 ◽  
pp. 31-38
Author(s):  
Horieh Moosavi ◽  
Fatemeh Rezaei ◽  
Zahra Rezaei ◽  
Zahra Soroush
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Control Group ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Restorative Materials ◽  
Acid And Base ◽  
Ph Cycling ◽  
Restorative Composites

Objective: The purpose of this study is the evaluation of the effect of pH cycling, including both acidic and alkaline environments, on the mechanical properties of tooth-colored restorative materials. Methods and Materials: 20 rectangular bar specimens of one bulk-fill restorative composite, two conventional nanohybrid restorative composites, and one restorative resin-modified glass ionomer were produced according to ISO 4049. Half of the materials were stored in an acid and base cycling defined as two-day storage in acidic (pH =4) and alkaline (pH=8) solutions. The rest of the materials were incubated in distilled water as a control group. The storage lasted for 48 days. Finally, flexural strength, elastic modulus, and microhardness of the specimens in each group determined. Data analyzed with Kruskal-Wallis, Dunn, MANOVA, Tukey HSD and T-test.  Results: The pH cycling model had a significant influence on all mechanical properties of the bulk-fill restorative composite and resin-modified glass ionomer than those stored in water (P <0.05). One of the conventional nanohybrid restorative composites showed a significant reduction in elastic modulus and microhardness while the other one showed a significant reduction only in flexural strength.  Conclusion: pH cycling negatively affects the mechanical properties of resin composites, and the materials’ composition is an important factor in the degradation of the resin-based materials examined.

scholarly journals Antimicrobial Activity of a Tissue Conditioner Combined with a Biocide Polymer

2015 ◽  
Vol 16 (2) ◽  
pp. 101-106 ◽  
Author(s):  
André Gustavo Paleari ◽  
Carina Toda ◽  
Danny Omar Mendoza Marin ◽  
Larissa Santana Rodriguez ◽  
Ana Carolina Pero ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Biofilm Formation ◽  
Antimicrobial Effect ◽  
Contact Angles ◽  
Material Surface ◽  
Control Group ◽  
Respective Control Group ◽  
Significant Difference ◽  
And Control ◽  
Tissue Conditioner

ABSTRACT Background The characteristics of tissue conditioners support microorganism development that can threaten the health of the dentures user. Purpose The object of this study was to evaluate the effect on antimicrobial activity, roughness and wettability surface of a tissue conditioners material combined with the antimicrobial polymer poly (2-tert-butilaminoethyl) methacrylate (PTBAEMA). Materials and methods Specimens of tissue conditioner (Coe Soft®) were divided into three groups, according to the concentration of PTBAEMA incorporated (0, 10 and 25%). Antimicrobial activity was assessed by adherence assay of one of the microorganisms, Staphylococcus aureus, Streptococcus mutans and Candida albicans. Roughness measurements were made using a Mitutoyo SJ-400, and the mean arithmetic roughness values (Ra) obtained were used for the comparisons. The wettability properties were determined by contact angle measurements. Results The group containing 25% of PTBAEMA inhibited totally the S. aureus and S. mutans biofilm formation. A significant reduction in the S. aureus (Kruskal-Wallis, p = 0,001) and S. mutans (Kruscal-Wallis, p = 0,001) count for 10% PTBAEMA group compared with respective control group. No significant difference was found for C. albicans among PTBAEMA groups and control group (ANOVA, p > 0,05). Incorporating 10 and 25% PTBAEMA increased surface roughness and decreased contact angles (ANOVA and Tukey's post hoc tests, α = 5%). Conclusion Incorporating 10% PTBAEMA into tissue conditioner increases wettability and roughness of tissue conditioner surface; and decreases the adhesion of S. mutans and S. aureus on material surface, but did not exhibit antimicrobial effect against C. albicans. Significance The PTBAEMA incorporated into tissue conditioner could prevent biofilm formation on elderly patient. How to cite this article Toda C, Marin DOM, Rodriguez LS, Paleari AG, Pero AC, Compagnoni MA. Antimicrobial Activity of a Tissue Conditioner Combined with a Biocide Polymer. J Contemp Dent Pract 2015;16(2):101-106.

scholarly journals Efficacy of S-PRG filler containing varnishes on enamel demineralization prevention

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Manuela da Silva Spinola ◽  
Sabrina Elise Moecke ◽  
Natália Rivoli Rossi ◽  
Toshiyuki Nakatsuka ◽  
Alessandra Bühler Borges ◽  
...  
Keyword(s):  
Positive Control ◽  
Negative Control ◽  
Cross Sectional ◽  
Enamel Demineralization ◽  
Ph Cycling ◽  
Knoop Microhardness ◽  
Bovine Enamel ◽  
Demineralization Prevention ◽  
Unprotected Area ◽  
One Way Anova

Abstract This study evaluated the efficacy of S-PRG vanishes on preventing enamel demineralization. Bovine enamel specimens were obtained, polished and the baseline Knoop microhardness was evaluated. Specimens were stratified into six groups (n = 15), according to the varnish applied: S10—experimental varnish containing 10% of S-PRG fillers, S20—20% of S-PRG fillers, S30—30% of S-PRG fillers; S40—40% of S-PRG fillers; PC (positive control)—5% of NaF; NC (negative control)—no treatment was performed. Half of enamel surfaces were protected to work as a control and varnishes were applied over the unprotected area. A demineralizing pH-cycling was performed, and surface and cross-sectional microhardness were measured. The percentage of microhardness of the treated area was calculated comparing with the untreated area. Statistical analysis was performed by one-way ANOVA and Tukey’s test (p = 5%). All experimental S-PRG varnishes protected against demineralization in relation to no treatment, but S40 was the most effective on the surface. For all depths, S30 and S40 were superior in enamel demineralization prevention than other S-PRG filler concentrations and 5% NaF. It was concluded that S-RPG filler containing varnishes were effective to prevent enamel demineralization. The higher concentrated products were more effective than 5% sodium fluoride on surface demineralization prevention.

scholarly journals Comparison of rimonabant and sibutramine treatment effects on food compulsion in rats

2009 ◽  
Vol 24 (6) ◽  
pp. 454-459
Author(s):  
Honório Sampaio Menezes ◽  
Verônica Ciulla ◽  
Paulo Sampaio Camargo ◽  
Cora Albrecht Correa ◽  
Tatiana Medina Costa de Oliveira
Keyword(s):  
Clinical Trial ◽  
Weight Gain ◽  
Control Group ◽  
Cb1 Receptors ◽  
Statistic Analysis ◽  
Test Results ◽  
Control Groups ◽  
Tukey Test ◽  
Student Test ◽  
And Control

PURPOSE: To compare the therapeutic effect of rimonabant, a new drug which is a selective antagonist of CB1 receptors, with the sibutramine. METHODS: It is an experimental clinical trial, prospective, placebo controlled. Our test was performed in 38 rats, adults females with a hyper caloric diet. We collected their blood 3 times and weighted them once a week. We divided the rats in 3 groups: Rimonabant, Sibutramine and Control. Statistic analysis has been made through ANOVA test, Tukey test and t Student test. RESULTS: The Rimonabant group demonstrated a significant reduction of the weight increase in rats. The Sibutramine group showed a significant reduction on blood glycemia compared to Rimonabant group and Control group. CONCLUSIONS: Rimonabant showed to be more effective than Sibutramine by decreasing weight gain. Sibutramine has been more effective than Rimonabant and Control groups by decreasing the blood glycemia.

scholarly journals Beneficial effect of bacteriocin-producing strain Enterococcus durans ED 26E/7 in model experiment using broiler rabbits

2017 ◽  
Vol 62 (No. 4) ◽  
pp. 168-177 ◽  
Author(s):  
A. Lauková ◽  
M. Pogány Simonová ◽  
Ľ. Chrastinová ◽  
A. Kandričáková ◽  
J. Ščerbová ◽  
...  
Keyword(s):  
Antimicrobial Effect ◽  
Blood Parameters ◽  
Control Group ◽  
Probiotic Properties ◽  
Enterococcus Durans ◽  
Commercial Feed ◽  
And Control ◽  
First Time ◽  
Experimental Group

From the aspect of probiotic properties and bacteriocins, Enterococcus faecium belongs to the most frequently studied species among enterococci. This study deals with testing the strain of the species Enterococcus durans ED 26E/7 in broiler rabbits. The strain ED 26E/7 isolated from ewes lump cheese produces an antimicrobial substance durancin. Forty-eight post-weaned rabbits (aged 5 weeks) of both sexes were divided into experimental group (EG) and control group (CG) per 24 animals each, and kept in standard cages, two animals per cage. EG group rabbits were additionally administered the ED 26E/7 strain (500 µl/animal/day) into water for 21 days. CG group rabbits were fed a commercial feed. The experiment lasted 42 days. Faeces and blood samples were taken on days 0–1 (experiment onset), 21 (after a 3-week application), and 42 (3 weeks after ED 26E/7 strain cessation). On days 21 and 42, rabbits were slaughtered and caeca and appendix were sampled. The rabbits’ digestive tract was found to be sufficiently colonized by the strain ED 26E/7; the antimicrobial effect was demonstrated in caecum and appendix (e.g. decrease in coliforms). Reduction of Eimeria sp. oocysts in EG compared to CG rabbits was detected on day 21, when also a significant (P &lt; 0.05) increase of phagocytic activity in EG was registered. Values of glutathione-peroxidase were lower in EG than in CG rabbits on day 21 implying that the ED 26E/7 application had not evoked oxidative stress. Biochemical blood parameters and quality of meat were not negatively influenced. First time tested in animals, E. durans ED 26E/7 seems to be a new candidate for use in rabbits husbandry.

scholarly journals Combined effect of Er,Cr:YSGG laser and casein phosphopeptide amorphous calcium phosphate on the prevention of enamel demineralization:

2020 ◽  
Vol 90 (3) ◽  
pp. 369-375
Author(s):  
Samar M. Adel ◽  
Eiman S. Marzouk ◽  
Nadia El-Harouni
Keyword(s):  
Calcium Phosphate ◽  
Amorphous Calcium Phosphate ◽  
Polarized Light ◽  
Group Iv ◽  
Control Group ◽  
Lesion Depth ◽  
Enamel Demineralization ◽  
Combined Use ◽  
Significant Difference ◽  
Casein Phosphopeptide

ABSTRACT Objectives To compare the effect of use of laser, casein phosphopeptide–amorphous calcium phosphate (CPP–ACP), and their combination on prevention of enamel demineralization using polarized light microscopy to assess lesion depth. Materials and Methods Eighty premolars were randomly allocated to four equal groups (n = 20): Group I: Control group, no preventive measures. Group II: CPP–ACP. Group III: Er,Cr:YSGG laser. Group IV: Er,Cr:YSGG laser followed by CPP–ACP. Specimens were subjected to thermocycling and brushing protocols equivalent to 1 year intraorally. Then, all teeth were subjected to acid challenge. Teeth were then sectioned longitudinally and examined under a polarized light microscope and lesion depth was measured. Results Group IV resulted in the least lesion depth with a significant difference between it and all other groups. CPP–ACP alone and laser alone also showed a significant difference in white spot lesion (WSL) depth compared to the control group; however, no significant difference was found between them. Conclusions The combined use of laser and CPP–ACP showed the best prevention against WSL development. The use of CPP–ACP or laser alone also resulted in a significant reduction in lesion depth but was significantly less than their combined use, with no significant difference between them.

Microbiological Evaluation of Ozone on Dentinal Lesions in Young Permanent Molars using the Stepwise Excavation

2018 ◽  
Vol 42 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Osama Safwat ◽  
Mona Elkateb ◽  
Karin Dowidar ◽  
Hala Abdel Salam ◽  
Omar El Meligy
Keyword(s):  
Base Material ◽  
Test Group ◽  
Antimicrobial Effect ◽  
Mutans Streptococci ◽  
Control Group ◽  
Controlled Clinical Trial ◽  
Microbial Count ◽  
Stepwise Excavation ◽  
Permanent Molars ◽  
And Control

Aim: To assess the microbial effect of ozone gas on dentinal lesions in young permanent molars using the stepwise excavation. Study design: An experimental, controlled clinical trial was performed. The sample included 80 immature first permanent molars, showing deep occlusal carious cavities that were indicated for stepwise excavation. Following first step of dentin excavation, the sample was divided into test (ozone gas) and control (calcium hydroxide (Ca(OH)2) base material) groups. One half of the cases in each group were evaluated for microbiological changes after 6 months, and the other half after 12 months. Results: Mutans streptococci (MS), Lactobacilli, and Candida counts were significantly reduced immediately after ozone application in the test group (P ≤0.05). At the final assessment period, MS and Lactobacilli were significantly reduced in the test group (P ≤0.05). Meanwhile, the Candida counts were significantly reduced only in the test group of the 6 and 12 month-cases (P ≤0.05). Regarding the control group, the significant reduction in microbial count was observed with MS after 6 and 12 months (P ≤0.05). No significant differences were observed between test and control groups at different evaluation periods (P &gt;0.05). Conclusions: Ozone gas had a significant antimicrobial effect in deep class I carious lesions.

Sign in / Sign up

Export Citation Format

Share Document