Effects of topical fluoride agents on artificial enamel lesion formation in vitro

WOS: 000175618100003PubMed ID: 12014163Objective: The purpose of this study was to assess the effects of topical fluoride agents on enamel erosion in vitro. Method and materials: Ten premolars extracted for orthodontic purposes were sectioned buccolingually and then longitudinally into two parts, so that four specimens were obtained from each tooth. The specimens were randomly assigned to one of four groups. The following topical fluoride agents were applied to the specimens: 1% titanium tetrafluoride (0.32 MF) for 1 minute; Duraphat (2.26% F) and Elmex (1.25% F) for 4 minutes. In the control group, no solution was applied. The specimens were treated with an artificial caries solution for 4, 8, 12, and 16 days. Calcium (Ca++) concentration was determined by an atomic absorbtion spectrophotometer, while fluoride (F-) concentration was determined with an ion-selective electrode. One-way analysis of variance tests were performed on cumulative concentrations of calcium and fluoride at days 4, 8, 12, and 16. Results: Specimens treated with titanium tetrafluoride lost significantly less calcium than did specimens in the other two test groups at all time periods. Titanium tetrafluoride-treated specimens released significantly less fluoride than did Duraphat- or Elmex-treated specimens at day 16. Conclusion: Titanium tetrafluoride was found to be more effective than the other fluoride agents in preventing artificial enamel lesion formation

Effect of dentin on the antibacterial activity of dentin bonding agents.

WOS: 00020289360332

Is an antibacterial adhesive system more effective than cavity disinfectants?

WOS: 000238582200009PubMed ID: 16838482Purpose: To compare the antibacterial activity of an adhesive system containing an antibacterial monomer MDPB, Clearfil Protect Bond with three different cavity disinfectants, chlorhexidine gluconate-based Consepsis, benzalkonium chloride-based Tubulicid Red and 3% hydrogen peroxide. Methods: Materials were tested using agar well technique and a tooth cavity model. The test materials were filled in the agar wells of plates inoculated with Streptococcus mutans. After 48 hours of incubation, the zones of inhibitions were measured in millimeters. For the tooth cavity model test, cylindrical cavities were prepared in the flat occlusal dentin of human extracted molars. The teeth were left in a broth culture of Streptococcus mutans at 37 degrees C for 72 hours allowing bacteria to invade. Teeth were then randomly assigned into five groups of five teeth (10 cavity preparations) each. In the first four groups test materials were applied into the cavities following the manufacturer's instructions and the cavities in the fifth group were left untreated for control. The teeth were kept in saline for 72 hours. Standard amounts of dentin chips were obtained from the cavity walls and the number of bacteria recovered was counted. Results: The results were analyzed by ANOVA, Dunnett C and Bonferroni tests. For the agar well technique, Clearfil Protect Bond primer exhibited greater inhibition zones than all three cavity disinfectants (P 0.05). They were superior to hydrogen peroxide in the cavity test method (P< 0.05)

Follow-up of flowable resin composites performed with a universal adhesive system in non-carious cervical lesions: A randomized, controlled 24-month clinical trial

PubMed: 320564142-s2.0-85079360208Purpose: This randomized, controlled study evaluated the 2-year clinical performance of two flowable resin composites performed with a universal adhesive in two etching modes for restoring non-carious cervical lesions (NCCLs). Methods: One hundred NCCLs were restored with two flowable composites (Charisma Opal Flow and G-aenial Universal Flo) and a universal adhesive (Single Bond Universal) with two etching modes (self-etch and etch&rinse) in a random order. The restorations were evaluated for retention, marginal adaptation, anatomic form, marginal discoloration, surface texture and secondary caries (modified USPHS criteria) at baseline, and after 6, 12 and 24 months. Results: The clinical success for retention, surface texture and secondary caries parameters was scored as 100% for each group after 6, 12 and 24 months. The first acceptable changes (Bravo score) in marginal adaptation, anatomical form and marginal discoloration started to show up after 12 months for all test groups, except for etch&rinse+Charisma Opal Flow. Self-etch+Charisma Opal Flow and self-etch+G-aenial Universal Flo showed progressive marginal discoloration that remained in the clinical acceptability level after 2 years. After 24 months, each resin composite restored with either the etch&rinse mode or the self-etch mode of the universal adhesive showed similar clinical performance. Marginal discoloration was higher in the restorations performed with the self-etch system. Selective-etching can be favorable. © 2020 Mosher and Linder, Inc. All rights reserved

Comparative Radiopacity of Six Flowable Resin Composites

WOS: 000279664500008PubMed ID: 20672728Objective: This study investigated the radiopacity of six commercially available flowable composites by using a digital image analysis method to determine the mean gray values of the materials. Methods: The flowable resin composites evaluated in this study were Clearfil Majesty Flow, Estelite Flow Q, Tetric N Flow, Esthet X Flow, Filtek Supreme XT Flow and Gradia Direct LoFlo. Ten sample discs (6 x 1 mm) for each group were prepared and 1-mm thick slices were obtained from freshly-extracted teeth for the control group. The mean gray values (MGVs) of each specimen and aluminum (Al) stepwedge were measured by using the histogram function of a computer graphics program. Analysis of variance (ANOVA) was used to investigate the significance of the differences among the groups. For pairwise comparisons, the Tukey test was applied (alpha=0.05). Results: The radiopacity values of Gradia Direct LoFlo, dentin and Estelite Flow Q were close to that of 1 mm Al. Tetric N Flow and Cl Majesty Flow were more radiopaque than enamel, whereas Filtek Supreme XT Flow had a similar radiopacity to enamel. Conclusion: The radiopacity of flowable composites varies considerably, and care must be taken when selecting an appropriate material to enable secondary caries detection under posterior composite restorations

Radiopacity of Posterior Restorative Materials: A Comparative In Vitro Study

BACKGROUND: The objective was to investigate the radiopacity of 11 commercial posterior restorative materials by establishing their mean gray values (MGVs) and comparing them with dental hard tissues. METHODS AND MATERIALS: Five-disc specimens were prepared for each of the following materials: Cerasmart 270 CAD/CAM block A3LT (CS), Amalgam (A), Ketac Molar A3 (KM), Cention-N A2 (CN), G-aenial Universal Flo AO2 (GO2) and A2 (G2), Ever-X Flow Dentine (EXD) and Bulk (EXB) shades, Equia Forte HT Fil A2 (EF2) and A3 (EF3), and Equia Fil A3 (E3). Freshly extracted maxillary premolar teeth were used as a control. The MGVs of specimens and a 10-step aluminum stepwedge (Al) were measured with Adobe Photoshop. ANOVA and Dunnett T3 tests were used to assess the significance of the differences (α=0.05). RESULTS: Statistically significant differences were revealed between some of the groups. Amalgam had the highest radiopacity. The radiopacity of dentin and CS were close to that of 1 mm Al. G2, KM, GO2, EXB, and EXD showed higher mean radiopacity than dentin. Enamel had a radiopacity equivalent to 2 mm Al. CN, EF2, and E3 had higher mean radiopacity than enamel. CONCLUSIONS: All materials met the ISO requirements. Alkasite and reinforced glass ionomer restoratives demonstrated higher mean radiopacity than the posterior flowable composites. Material shades did not affect the radiopacity. ©Operative Dentistry, 2023