The effect of light curing units, curing time, and veneering materials on resin cement microhardness

Ilday, Nurcan Özakar; Bayindir, Yusuf Ziya; Bayındır, Funda; Gurpinar, Aysel

doi:10.1016/j.jds.2012.09.014

Cited by 13 publications

(10 citation statements)

References 25 publications

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“…The inadequate polymerisation of resin cement under a restoration may adversely affect the mechanical properties and the dimensional stability of that restoration. 37,38 In this study, the bonding values were found to be higher in the light devices with high output power.…”

Section: Discussionmentioning

confidence: 52%

The Effects of Different Colors and Light Sources on the Bond Strength of Cerec Feldspathic Blocks Bonded to Light-Cured Resin Cement

Evmek

Duran

2019

Cumhuriyet Dental Journal

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Objectives: To evaluate the bonding with resin cement of different colored prefabricated feldspathic ceramic blocks used in the computer aided design and computer aided manufacturing (CAD-CAM) technique when different light sources were used beneath the ceramics.Materials and Methods: Specimens of 2 mm thickness were prepared in nine different colors. All the groups were bonded to composite resin blocks using a light-cured resin cement beneath plasma arc (PAC, 2400 mW/cm 2 ), light emitting diode (LED, 1600-1800 mW/cm 2 ) and quartz tungsten halogen (QTH, 800-1200 mW/cm 2 ) light sources. Following the cementation, all the specimens were kept in distilled water for 24 hours in closed cups before the shear test was performed. The data were analysed by means of a two-way analysis of variance (ANOVA) and the Tukey HSD test (p<0.05).Results: The highest light power was observed in the PAC groups, while the lowest light power was observed in the QTH groups, and the difference was found to be statistically significant (p<0.05). The highest bond strengths were obtained in the S2M and S2T color groups without the discrimination of the light source, and no statistically significant difference was found between these groups. The lowest bond strength was obtained in the S4O color group. Conclusions:This in vitro study found that the bond strength of feldspathic ceramic restorations is directly related to the utilised light source and, further, that the bond strength decreases as the ceramic color becomes darker.

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Section: Discussionmentioning

confidence: 52%

The Effects of Different Colors and Light Sources on the Bond Strength of Cerec Feldspathic Blocks Bonded to Light-Cured Resin Cement

Evmek

Duran

2019

Cumhuriyet Dental Journal

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“…These findings could be due to a larger polymerization shrinkage problem existing in the resin cements, since the assembly was exposed to light more often. D'Árcangelo et al on their study found that no veneers detached after an observation period of 84 months [30]. Guess and Stappert reported a loss of retention percentage of 2.3% after 5 years, Fradeani et al a loss of 3.3% after 4.5 and 12 years, respectively [23,24].…”

Section: Discussionmentioning

confidence: 99%

Study of lumineers' interfaces by means of optical coherence tomography

Borges

Cassimiro-Silva

Fernandes

et al. 2015

Biophotonics South America

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OCT has been used to evaluate dental materials, and is employed here to evaluate lumineers for the first time. Lumineers are used as esthetical indirect restoration, and after wearing and aging, several undesirable features such as gaps, bubbles and mismatch can appear in which would only be seen by invasive analysis. The OCT (spectral domain SD-OCT, 930nm central wavelength) was used to evaluate noninvasively the lumineer-cement-tooth interface. We analyzed 20 specimens of lumineers-teeth that were prepared in bovine teeth and randomly allocated in 4 experimental groups (n=5) with two different cementation techniques and two different types of cementing agent (RelyX U200 and RelyX Veneer, 3M ESPE, with the adhesive recommended by the manufacture). The lumineers were made of lithium disilicate and obtained using a vacuum injection technique. The analysis was performed by using 2D and 3D OCT images, obtained before and after cementing and the thermal cycling process to simulate thermal stress in a oral cavity. Initial measurements showed that the SD-OCT was able to see through the 500µm thick lumineer, as delivered by the fabricant, and internal stress was observed. Failures were found in the cementing process and also after ageing simulation by thermal cycling. The adhesive failures as bubbles, gaps and degradation of the cementation line are the natural precursors of other defects reported by several studies of clinical follow-up (detachments, fractures and cracks). Bubble dimensions ranging from 146 µm to 1427 µm were measured and the OCT was validated as an investigative and precise tool for evaluation of the lumineer-cement-tooth.

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“…This technique to smooth and flatten the surface reduces the incorporation of air bubbles into the body of the material. 7,15,21,22,23,24,25 Light curing was performed for 40 seconds on each surface, using halogen light (Foto Optilight LD Max, Gnatus -50/60 Hz), with the active tip of the equipment directly touching the glass slides. 7,19,26 Specimens were removed from the matrix after a 10 minute mean time.…”

Section: Preparation Of Specimensmentioning

confidence: 99%

Surface morphologic evaluation of orthodontic bonding systems under conditions of cariogenic challenge

et al. 2019

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Orthodontic bonding systems are submitted to demineralization and remineralization dynamics that might compromise their surface smoothness, and favor biofilm aggregation and caries development. The aim of the present study was to evaluate the effects of a cariogenic challenge model (in vitro pH-cycling model) on the surface roughness and topography of 3 bonding materials: Transbond TM XT (XT), Transbond TM Plus Color Change (PLUS) and Fuji Ortho TM LC (FUJI), by means of Atomic Force Microscopy (AFM). Six specimens with standardized dimensions and surface smoothness were fabricated per group, and the materials were manipulated in accordance with the manufacturers' instructions. No polishing was necessary. AFM tests were performed before and after pH-cycling, taking 3 readouts per specimen. The roughness results (Ra) were obtained at nanometric levels (nm) and surface records were acquired in two-and three-dimensional images of height and lock-in phase of the material components. The surfaces of all groups analyzed in the study were morphologically altered, presenting images suggestive of matrix degradation and loss of matrix-load integrity. FUJI presented the greatest increase in surface roughness, followed by XT and PLUS, respectively (p≤0.001). Nevertheless, the roughness values found did not present sufficient degradation to harbor bacteria. The surface roughness of all tested materials was increased by pH-cycling. The use of materials capable of resisting degradation in the oral environment is recommended, in order to conserve their integrity and of the surrounding tissues.

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The effect of light curing units, curing time, and veneering materials on resin cement microhardness

Cited by 13 publications

References 25 publications

The Effects of Different Colors and Light Sources on the Bond Strength of Cerec Feldspathic Blocks Bonded to Light-Cured Resin Cement

The Effects of Different Colors and Light Sources on the Bond Strength of Cerec Feldspathic Blocks Bonded to Light-Cured Resin Cement

Study of lumineers' interfaces by means of optical coherence tomography

Surface morphologic evaluation of orthodontic bonding systems under conditions of cariogenic challenge

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