Suboptimal light curing and direct exposure to water of two contemporary composites: degree of conversion, sorption, solubility, and Knoop hardness

Wikant, Aksel; Gedde, Ulf W.; Hakeberg, Magnus; Örtengren, Ulf

doi:10.1111/eos.12705

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…DC was calculated by estimating the changes in peak height ratio of the absorbance intensities of aliphatic C=C peak at 1639 cm -1 and peak of aromatic C=C at 1608 cm -1 , polymerization in relation to the degree of convergence of an uncured material from each resin that was tested first (Figure 2). The DC % was calculated using the equation below (Wikant et al, 2020): DC= [1-(1639 cm -1 /1608cm -1 ) cured / (1639 cm -1 /1608cm -1 ) uncured]×100%…”

Section: Testing Proceduresmentioning

confidence: 99%

effect of light-curing distance on the degree of convergence of the top and bottom sides of flowable bulk-fill composite materials

Alzaidy

Abd-alla

2022

ijhs

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Background: Flow able bulk-fill materials were introduced to be used in one thick increment of an internal base underneath a conventional layer. However, complete polymerization of the whole layer, particularly the bottom surface, is essential to achieve biocompatibility and the best mechanical properties. Objective: To evaluate the effect of three light-curing distances (0, 2, and 4mm)on the degree of convergence(DC) of the top and bottom surfaces for three flowable bulk-fill composite resins; Smart dentin replacement, Opus bulk fill flow, and Tetric N flow. Methods:45 disk-shaped specimens with an internal diameter of 5 mm and a depth of4mm cured for 20 seconds were fabricated from the three composite resins (n=15). For each material, three subgroups were fabricated according to the position of the light tip from the top surface; at 0, 2, and 4mm distances. DC for the top and bottom sides of all the specimens was calculated using FTIR spectroscopy. The statistical significance for the mean values of DC% among the different groups was calculated using a one-way analysis of variance (ANOVA) and the Tukey test with a significance level of 0.05.

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Section: Testing Proceduresmentioning

confidence: 99%

effect of light-curing distance on the degree of convergence of the top and bottom sides of flowable bulk-fill composite materials

Alzaidy

Abd-alla

2022

ijhs

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The formation of cariogenic plaque to contemporary adhesive restorative materials: an in vitro study

Lehrkinder,

Rydholm,

Wänström

et al. 2024

Odontology

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The research exploiting the ability of dental materials to induce or prevent secondary caries (SC) development still seems inconclusive. Controlling bacterial adhesion by releasing bacteriostatic ions and improving the surface structure has been suggested to reduce the occurrence of SC. This paper analyses the impact of five distinctively composed dental materials on cariogenic biofilm formation. Forty-five specimens of three composites (CeramX Spectra ST, Admira Fusion, Beautifil II) and two glass–ionomers (Fuji II LC, Caredyne Restore), respectively, were incubated in bacterial suspension composed of Streptococcus mutans, Lactobacillus acidophilus, Streptococcus mitis, Streptococcus sanguinis, and Streptococcus salivarius at pH 7.0 and 5.5. Coverslips were used as a control. Adhered bacteria were collected after 2, 4, 6, 12, 24, and 48 h and analyzed using quantitative polymerase chain reaction (qPCR). Fluoride leakage was measured at each collection. The specimens’ surface topography was assessed using interferometry. In the present study, surface roughness seemed to have a partial role in bacterial adhesion and biofilm formation, together with chemical composition of the materials tested. Despite differences in fluoride leakage, biofilm accumulation was similar across materials, but the number of adhered bacteria differed significantly. A release of other ions may also affect adhesion. These variations suggest that certain materials may be more prone to initiating secondary caries.

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Performance of Multiple Light-curing Units used by Dental Students

Al-Zain¹,

Al-Ghamdi²,

Basahal³

et al. 2020

TODENTJ

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Aim: To investigate the performance of multiple Light-curing Units (LCUs) of different manufacturers used in a dental student clinical setting. Background: Manufacturers claim that the irradiance values of the LCUs stay stable over time. However, this may not be accurate among the different units. Objective: This study investigated the performance in terms of the irradiance, radiant exposure, and DOC of multiple LCUs of different types used in a dental student clinical setting. Methods: Four different LCU were investigated (n=5 units/LCU manufacturer): three Light-Emitting-Diodes (LED) units (Demi Ultra, Mini LED, and E-Morlit) and one quartz-tungsten-halogen (QTH) (PolyluxII). Irradiance and radiant exposure were collected [Managing Accurate Resin Curing-Patient Simulator (MARC-PS)](n=5 readings/unit/tooth). Depth of Cure (DOC) was performed (ISO 4049:2009standards) using a micro-hybrid composite (n=5/unit). Data were analyzed using Kruskal-Wallis and ANOVA followed by Student-Newman-Keuls and Tukey post hoc methods, respectively (α=0.05). Results: Using the MARC-PS anterior and posterior teeth sensors, respectively, the mean irradiance for Demi Ultra was (1625.7±38.8) and (1250.4±25.2); Mini LED (1381.1±37.8) and (1058.1±27.3); E-Morlit (1831.1±294.7) and (1545.2±176.0); and Polylux II (932.4±368.5) and (840.4±353.4)mW/cm2. The radiant exposure range was 16-38 J/cm2 for all LCUs. LCUs’ mean DOC ranged from 2.9 to 3.1 mm. Significant differences in irradiance and radiant exposure values were detected among the multiple units and manufacturers. Significant differences in DOC values among the Demi Ultra and Polylux II units were detected. DOC met the standards except for onePolylux II unit. Conclusion: The irradiance and radiant exposure values were not the same among the different units, regardless of the manufacturers’ claim of the irradiance values stability over time. Polymerization was not compromised except for one QTH unit per the DOC measurements. Itis highly recommended to closely monitor LCUs used in dental student clinical areas due to the high demand in this type of setting.

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Suboptimal light curing and direct exposure to water of two contemporary composites: degree of conversion, sorption, solubility, and Knoop hardness

Cited by 3 publications

References 35 publications

effect of light-curing distance on the degree of convergence of the top and bottom sides of flowable bulk-fill composite materials

effect of light-curing distance on the degree of convergence of the top and bottom sides of flowable bulk-fill composite materials

The formation of cariogenic plaque to contemporary adhesive restorative materials: an in vitro study

Performance of Multiple Light-curing Units used by Dental Students

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