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Model-Based Systems Engineering for an Aircraft Design Process driven by Digital Twinning
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
Efficacy of a new dentin bonding system after laser and bur preparation: a microleakage study.
No full textEffects of Carisolv on dentine surface morphology: Scanning Electron Microscopy (SEM) observations.
No full textStaining of dental composite resins with chlorhexidine mouthwashes
No full textObjective. The purpose of this in vitro study was to evaluate staining of 4 dental composite resins, two microfilled and two nanofilled, exposed to different chlorhexidine mouthwashes.
Materials and methods. The composite resins (Esthet-X, Gradia Direct, Ceram-X Mono, and Filtek Supreme XT) were polymerized into 120 plastic rings (height 2 mm; internal diameter 4 mm; external diameter 6 mm) to obtain identical specimens. The specimens were subjected to 2 chlorhexidine mouthwashes (Corsodyl 0.2% and Curasept ADS 0.2%), one of those containing an antidiscoloration system. The specimens were dipped for 1 minute, twice at day (every 12 hours), for 15 days into the mouthwash and into distilled water (as control). Color of specimens was measured with a spectrophotometer according to the CIE L*a*b* system after light-polymerization of composite resin specimens, after 7 days and after 14 days of treatment with chlorhexidine. The color differences (ΔEab*) between each measurement were calculated. Analysis of variance (ANOVA) was used to analyze the data.
Results. All specimens showed a significant progressive increase in staining with increasing number of rinsing in all chlorhexidine mouthwashes, with a similar trend and no significant differences between microfilled and nanofilled composite resins.
Significance. Microfilled and nanofilled composite resins had similar in vitro discoloration in both 0.2% chlorhexidine mouthwashes. Chlorhexidine mouthwash with anti discoloration system stained the evaluated composite resins in the same way as conventional 0.2% chlorhexidine mouthwash
Rimozione della dentina cariata con un sistema chemiomeccanico non invasivo: indagine ultrastrutturale.
No full text
SOLUBILITY IN WATER OF RESIN BASED ROOT-CANAL SEALERS
Full text linkAIMS. The solubility of two epoxy resin-based root canal sealers was tested in vitro, comparing them to a conventional ZnOE-based sealer.
MATERIALS AND METHODS. Thirty similar specimens of each material were prepared using stainless steel ring molds with the same internal diameter and the same height. Solubility was determined by using mean weight loss (%) after 24 hours according to the International Standards Organization 6876 standard and the American Dental Association specifications No. 57. The results were analyzed statistically with a one-way analysis of variance test (ANOVA).
RESULTS. ANOVA test showed significant differences among the resin-based sealers and the ZnOE-based sealer. Resin-based sealers reported significant low solubility percentages (P<0.05).
CONCLUSIONS. All the materials fulfilled the requirements of the International Standard 6876 and ANSI/ADA specification No. 57 demonstrating a weight loss of less than 3%. Under the conditions of the present study, tested resin-based root canal sealers were of very low solubility. They can be considered virtually insoluble
Influence of eugenol and non-eugenol endodontic sealers on bonding fiber posts into root canal: a SEM investigation
Full text linkAim. The aim of this study was to evaluate the influence of eugenol and non-eugenol sealers on bonding fiber posts into root canal.
Methods. Forty-eight human maxillary incisors were endodontically treated and sealed with gutta-percha and eugenol and non-eugenol sealers. A week later the coronal part of the samples was removed and a fiber post was placed in each root. The posts were luted with the same dual adhesive resin cement and the core was built up. After a week, the root samples were longitudinally sectioned and prepared for SEM observation. The incidence of gaps found at the adhesive interfacewas recorded.
Results. There was no statistical difference regarding the presence of gaps at the adhesive interfaces among the groups of eugenol and non-eugenol sealers.
Conclusions. The use of both eugenol and noneugenol endodontic sealers does not affect hybrid layer formation in a post luting procedure
Cyclic Fatigue Resistance of Three Niti Single-File Systems after Immersion in EDTA
No full textObjective: To evaluate and to compare in vitro the cyclic fatigue resistance of three NiTI single-file systems (One Shape, Reciproc
and Wave One) after immersion in 10% EDTA solution over different time periods.
Materials and Methods: Cyclic fatigue test of three NiTi single-file systems was performed in a curved stainless steel artificial canal with 60° angle and 5 mm radius of curvature. 45 OneShape, 45 Reciproc R25 and 45 WaveOne Primary were tested after three different immersion protocols: 1 min in 10% EDTA at 37°C, 5 min in 10% EDTA at 37°C, no immersion. The number of cycles to fracture (NCF) was determined by measuring the time to fracture. The data were compared for differences by using 2-way analysis of variance (P=0.05).
Results: In general, resistance to cyclic fatigue was not significantly affected by immersion in 10% EDTA. Reciproc R25 showed the highest cyclic fatigue resistance in all groups.
Conclusions: 10% EDTA did not decrease/increase the cyclic fatigue resistance of NiTI single-file systems appreciably in vitro. Reciproc R25 was more resistant, but the new rotary OneShape instruments showed good mechanical resistance, similar to WaveOne Primary files developed for reciprocating motion
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