Search results for "PAINT"
showing 10 items of 605 documents
Reduction of Polymerization Shrinkage Stress and Marginal Microleakage Using Soft-Start Polymerization
2003
Purpose: This study evaluated the influence of a soft-start light-curing exposure on polymerization shrinkage stress and marginal integrity of adhesive restorations. Materials and Methods: Six resin-based composites (Pertac II, Tetric Ceram, Definite, Surefil, Solitaire, and Visio-Molar) were adhesively bonded to a cylindrical cavity (n = 9 per material/light) in a photoelastic material. Visible light-curing was applied using either the standard polymerization mode (800 mW/cm2 exposure duration 40 s) of the curing light (Elipar TriLight, 3M ESPE) or the exponential mode from the same device (ramp-curing: 150 mW/cm2 to 800 mW/cm2 within the first 15 s of a total curing time of 40 s). Polymer…
Effects of elevated hydrogen peroxide 'strip' bleaching on surface and subsurface enamel including subsurface histomorphology, micro-chemical composi…
2007
Abstract Objectives This study examined the effects of elevated concentration hydrogen peroxide tooth whitening treatments on tooth surface and subsurface integrity. Methods Sound human molars were ground and polished to prepare an uniform substrate for bleaching treatments. A cycling treatment included alternating ex vivo human salivary exposures with bleaching treatments under conditions of controlled temperature and durations of treatment. Bleaching was carried out with prototype bleaching strips containing hydrogen peroxide gel at 13% and 16% concentrations. A non-bleached group was used as a control. Treatments included 28 h of total bleaching exposure in vitro . Surface color was meas…
Assessment of shear bond strength and microleakage of fissure sealant following enamel deproteinization : an in vitro study
2020
Background To evaluate the effect of two different deproteinizing agents (5.25% sodium hypochlorite and Papacarie®) prior to acid etching on the shear bond strength and microleakage of a fissure sealant material. Material and methods A total of 123 extracted noncarious human third molar teeth were randomly divided into three groups for each test: acid etching alone (control) (C), sodium hypochlorite (NaOCl), and Papacarie Duo® (PC). The shear bond strength tests were performed using a universal testing machine, and microleakage was evaluated using a dye penetration method. Results The mean shear bond strength values obtained in Group C were significantly lower than those of Group NaOCl and …
Prospective study of monolithic zirconia crowns: clinical behavior and survival rate at a 5-year follow-up
2020
Purpose To evaluate the clinical behavior and survival of full coverage monolithic zirconia crowns on posterior teeth over a 5-year follow-up. Methods Fifty patients were recruited and underwent restoration with a Lava Plus monolithic zirconia crown (Lava™ Frame Zirconia, 3M Espe, Germany) on premolars or molars. Patients were monitored over a 5-year follow-up (2014-19), recording any biological and/or mechanical complications; these data were used to estimate the crowns' success rate. Periodontal clinical parameters were recorded (pocket probing depth (PPD), plaque index (PLI), bleeding on probing (BOP), and gingival recession (GR)). Wear to the zirconia crowns and antagonist teeth were al…
La chiesa e il monastero di San Nicolò di Bisacquino. Note su uno scrigno d'arte perduto
2019
Si ricostruisce il ricco patrimonio d’arte della chiesa e del monastero di San Nicolò di Bisacquino, scrigno d’arte perduto, e si identificano alcune opere salvate dalla dispersione. Dai dipinti di Mariano Rossi, che ornavano alcuni altari della chiesa, alle preziose opere, individuando in alcuni casi per queste ultime anche gli artefici. The rich art heritage of the church and monastery of San Nicolò di Bisacquino, a lost art treasure chest, is reconstructed and some works saved from dispersion are identified. From the paintings by Mariano Rossi, who adorned some altars of the church, to the precious works, identifying in some cases for the latter also the creators.
Il complesso monastico di Santa Maria Maddalena di Corleone
2019
Le inedite fonti archivistiche indagate del monastero di Santa Maria Maddalena di Corleone hanno permesso di conoscere le committenze delle nobili e facoltose badesse per l’antico complesso benedettino, che miravano a rinnovare, arricchire e ornare gli spazi sacri rivolgendosi ad artisti di chiara fama. Da Tommaso de Vigilia ad Antonello Gagini, ad Antonio Vasquez e ancora a noti marmorarii, stuccatori, intagliatori e argentieri riservando la realizzazione delle opere a ricamo alle abili consorelle della stessa fondazione monastica. Del prezioso patrimonio ricordato dalle carte d’archivio si rintracciano alcune importanti opere, come i preziosi paliotti ricamati arricchiti ora con perline s…
«LE ARMONIE IMITTANO… LI STREPPITI DE’ VENTI… IL BELAR DELLE PECORE, IL NITRIR DE’ CAVALLI». NATURA E PASSIONI IN MONTEVERDI
2018
Monteverdi esprime la sua idea di imitazione della natura in una lettera del , e laapplica in diverse composizioni. In particolare è interessante analizzare il madrigal A un giro sol, dal quarto libro, in cui Monteverdi mette in musica due affetti opposti: la gioia e la luminosità della natura, e la sofferenza del poeta innamorato. Il primo viene espresso attraverso una musica puramente diatonica, il secondo tramite il cromatismo e le dissonanze. L’aproccio di Monteverdi mostra anche somiglianze con la pittura di paesaggio del suo tempo, come risulta evidente dalla comparazione con gli scritti di Giovanni Battista Agucchi. Monteverdi expresses his idea about the musical imitation of nat…
Effect of Hydrogen and Carbamide Peroxide in Bleaching, Enamel Morphology, and Mineral Composition: In vitro Study
2017
ABSTRACT Aim The aim of the study was to evaluate the bleaching effect, morphological changes, and variations in calcium (Ca) and phosphate (P) in the enamel with hydrogen peroxide (HP) and carbamide peroxide (CP) after the use of different application regimens. Materials and methods Four groups of five teeth were randomly assigned, according to the treatment protocol: HP 37.5% applied for 30 or 60 minutes (HP30, HP60), CP 16% applied for 14 or 28 hours (CP14, CP28). Changes in dental color were evaluated, according to the following formula: ΔE = [(La−Lb)2+(aa−ab)2 + (ba−bb)2]½. Enamel morphology and Ca and P compositions were evaluated by confocal laser scanning microscope and environmenta…
Les images de la vie terrestre de la Vierge dans l'art mural (peintures et mosaïques) en France et en Italie : des origines de l’iconographie chrétie…
2012
This thesis is devoted to wall images of the Virgin’s earthly life, an iconographic sequence composed of the young Mary’s history and episodes from Christ’s life which are related to the Virgin, until Pentecost. This research comes within the extended framework from the early Christian art to the Council of Trent. It is based on an abundant iconographic documentation which includes more than 2300 pictures, wall paintings and mosaics, preserved in France and Italy. The first part of the thesis is dedicated to the quantitative analysis of the iconographic documentation, according to a triple point of view. A thematic analysis identifies three phases in the chronological sequence of the Virgin…
A multivariate statistical approach of X-ray fluorescence characterization of a large collection of reverse glass paintings
2019
We present an X-ray fluorescence spectroscopy (XRF) study combined with a multivariate approach that allow to detect compositional differences and similarities among the glass supports of a large set of reverse glass paintings belonging to the collection of the Mistretta museum. Reverse painting on glass is an old decorative technique used since the Roman time consisting in applying a cold paint layer on the reverse side of a glass support. The collection shows a large spreading of provenience and dating of the items. In consideration of the current classification solely based on stylistic criteria, we applied a multivariate analysis on the XRF measurements data set to find a more objective…