Aim:The aim of this study is to evaluate the effect of alcohol and nonalcohol containing mouth rinses on the color stability of a nanofilled resin composite restorative material.Materials and Methods:A total of 120 samples of a nanofilled resin composite material (Tetric N-Ceram, Ivoclar Vivadent AG, FL-9494 Schaan/Liechtenstein) were prepared and immersed in distilled water for 24 h. Baseline color values were recorded using Color Spectrophotometer 3600d (Konica Minolta, Japan). Samples were then randomly distributed into six groups: Group I - distilled water (control group), Group II - Listerine, Group III - Eludril, Group IV - Phosflur, Group V - Amflor, and Group VI - Rexidin. The postimmersion color values of the samples were then recorded, respectively.Results:Significant reduction in the mean color value (before and after immersion) was observed in nonalcohol containing mouth rinses (P < 0.001).Conclusion:All mouthrinses tested in the present in-vitro study caused a color shift in the nanofilled resin composite restorative material, but the color shift was dependent on the material and the mouthrinse used. Group VI (Rexidin) showed maximum color change.

Background:A novel technique of sterilization of endodontic files is introduced in this article.Aims:Newly introduced sterilization unit, named “SteriFast” is compared with autoclave and glass bead sterilizer using biological indicator.Materials and Methods:Spore strips of Bacillus pumilus were cultured in nutrient broth. This cultured media was used to contaminate the experimental samples of endodontic files. These contaminated files were sterilized using three different techniques. The sterilized files were transferred into nutrient medium under aseptic condition. The results were observed after 24 h, 48 h, and 7 days.Results:The results showed that autoclave and new sterilization device (SteriFast) showed complete sterilization. The files sterilized using glass bead sterilizer showed bacterial growth (80%).Conclusions:Thus, it proves that autoclave and SteriFast are ideal techniques of sterilization of endodontic files. Glass bead sterilizer does not completely sterilize the files. The article also compares SteriFast and autoclave in other aspects such as its design, basic principle, advantages, and disadvantages. The article also describes features and design of SteriFast, used for all kind of small dental instruments.

Introduction:The objective of this study was to evaluate dentinal defects formed by new rotary system — Protaper next™ (PTN).Materials and Methods:Sixty single-rooted premolars were selected. All specimens were decoronated and divided into four groups, each group having 15 specimens. Group I specimens were prepared by Hand K-files (Mani), Group II with ProTaper Universal (PT; Dentsply Maillefer), Group III with Hero Shaper (HS; Micro-Mega, Besancon, France), and Group IV with PTN (Dentsply Maillefer). Roots of each specimen were sectioned at 3, 6, and 9mm from the apex and were then viewed under a stereomicroscope to evaluate presence or absence of dentinal defects.Results:In roots prepared with hand files (HFs) showed lowest percentage of dentinal defects (6.7%); whereas in roots prepared with PT, HS, and PTN it was 40, 66.7, and 26.7%, respectively. There was significant difference between the HS group and the PTN group (P < 0.05).Conclusion:All rotary files induced defects in root dentin, whereas the hand instruments induced minimal defects.

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Purpose:The aim of current study was to compare and evaluate the sealing ability of root canal sealer with and without triple antibiotic paste. Materials and methods:Fifty extracted human single rooted teeth were selected and each test group had 25 teeth. The teeth were decoronated and then prepared with protaper rotary files till the no F2 in conjunction with 17% EDTA lubrication and 2 ml of 5.25% sodium hypochlorite irrigation. The teeth in group I were obturated using the zinc oxide sealer mixed with triple antibiotic paste and the teeth in group II were obturated using the zinc oxide sealer alone and then nail varnish was applied leaving the apical 3 mm of root exposed. The apical third was then immersed in 5 ml of 2% methylene blue dye in 15 ml screw capped bottle for 72 hours. The varnish was removed and the teeth were subsequently immersed in 35% nitric acid and kept again for 72 hours in a centrifugal tube. After the teeth were completely dissolved the solution was then filtered with a fine grit filter paper and centrifuged at 2000 rpm for 1 minute. The collected solution was then subjected to spectrophotometric analysis. The data was evaluated statistically by Mann-Whitney U-test. Results:The results showed significant differences (p < 0.05) between the sealing ability of two groups evaluated. Conclusion:Present study suggests that addition of triple antibiotic paste to the sealer increased its sealing ability, reduced the microleakage and also imparts the antimicrobial property to the sealer.