Characteristics of visible-light-activated composite systems

Watts, David C.; Amer, Omar; Combe, E.C.

doi:10.1038/sj.bdj.4805312

Cited by 166 publications

(80 citation statements)

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“…According to diff erent investigators, acceptable depth of cure is achieved when hardness of the bottom layer is at least 80% corresponding to hardness measured at the surface 16,21,22 .…”

Section: Discussionmentioning

confidence: 99%

Microhardness of Bulk-Fill Composite Materials

Kelić¹,

Matić

Marović

et al. 2016

acc

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SUMMARY -Th e aim of the study was to determine microhardness of high-and low-viscosity bulk-fi ll composite resins and compare it with conventional composite materials. Four materials of high-viscosity were tested, including three bulk-fi lls: QuiXfi l (QF), x-tra fi l (XTF) and Tetric EvoCeram Bulk Fill (TEBCF), while nanohybrid composite GrandioSO (GSO) served as control. Th e other four were low-viscosity composites, three bulk-fi ll materials: Smart Dentin Replacement (SDR), Venus Bulk Fill (VBF) and x-tra base (XB), and conventional control material X-Flow (XF). Composite samples (n=5) were polymerized for 20 s with Bluephase G2 curing unit. Vickers hardness was used to determine microhardness of each material at the surface, and at 2-mm and 4-mm depth. GSO on average recorded signifi cantly higher microhardness values than bulk-fi ll materials (p<0.001). Th e low-viscosity composite XF revealed similar microhardness values as SDR, but signifi cantly lower than XB (p<0.001) and signifi cantly higher than VBF (p<0.001). Microhardness of high-viscosity bulk-fi ll materials was lower than microhardness of the conventional composite material (GSO). Surface microhardness of low-viscosity materials was generally even lower. Th e microhardness of all tested materials at 4 mm was not diff erent from their surface values. However, additional capping layer was a necessity for low-viscosity bulk-fi ll materials due to their low microhardness.

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“…According to diff erent investigators, acceptable depth of cure is achieved when hardness of the bottom layer is at least 80% corresponding to hardness measured at the surface 16,21,22 .…”

Section: Discussionmentioning

confidence: 99%

Microhardness of Bulk-Fill Composite Materials

Kelić¹,

Matić

Marović

et al. 2016

acc

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“…It has been suggested that the top-to-bottom hardness gradient should not exceed 10 -20% (ie, hardness ratio should be greater than 0.8) for adequately polymerized photo-activated resin composite [1][2][3][4][5]8,16) . Depth at which a 20% reduction had taken place in maximum hardness was considered as a realistic depth of cure 2,3,17) . At depths greater than 2 ㎜, poor polymerization of composite resulted, for polymerization was very susceptible to changes in light intensity and exposure duration [1][2][3]8,13) .…”

Section: ⅲ Resultsmentioning

confidence: 99%

Influence of thickness on the degree of cure of composite resin core material

Kwon

Park

2006

J Korean Acad Conserv Dent

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The purpose of this study was to investigate the influence of thickness on the degree of cure of dual-cured composite core.2, 4, 6, 8 ㎜ thickness Luxacore Dual and Luxacore Self (DMG Inc, Hamburg, Germany) core composites were cured by bulk or incremental filling with halogen curing unit or self-cure mode. The specimens were stored at 37℃ for 24 hours and the Knoop' s hardness of top and bottom surfaces were measured.The statistical analysis was performed using ANOVA and Tukey' s test at p = 0.05 significance level.In self cure mode, polymerization is not affected by the thickness. In Luxacore dual, polymerization of the bottom surface was effective in 2, 4 and 6 (incremental) ㎜ specimens. However the 6 (bulk) and 8 (bulk, incremental) ㎜ filling groups showed lower bottom/top hardness ratio (p < 0.05). Within the limitation of this experiment, incremental filling is better than bulk filling in case of over 4 ㎜ depth, and bulk filling should be avoided. [J Kor Acad Cons Dent 31(5): [352][353][354][355][356][357][358] 2006]

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“…These results are in agreement with previous reports, in which the bonding ability of self-etch adhesives is dependent upon light irradiation intensity 10) . It has been reported that attenuation of light reduced the degree of conversion of carbon double bonds (C=C) [24][25][26] and lowered the mechanical properties, leaving uncured resin monomers 27) . Therefore, the lower bond strength of the 350 mW/cm 2 Table 3 Micro-tensile bond strength to dentin in MPa For the SE and TS groups, nanoleakage expression is identified along the adhesive-dentin interface(white arrow).…”

Section: Discussionmentioning

confidence: 99%

The influence of light intensities irradiated directly and indirectly through resin composite to self-etch adhesives on dentin bonding

et al. 2011

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This study was designed to evaluate effects of light-irradiated intensities directly and indirectly through resin composites to one-and two-step self-etch adhesives on dentin bonding. One-step (Clearfil S 3 Bond; TS, Bond Force; BF) or two-step (Clearfil SE Bond; SE) self-etch adhesives was applied to dentin surface. The adhesive agent was light-cured with light-intensity of 350 or 600 mW/cm 2 , and then resin composite with different colors (translucent or opaque shade) was filled and light-cured with the same light-intensity as the bonding procedure. After 24 h water storage, bond strengths to dentin were determined using µTBS test. For the 600 and 350 mW/ cm 2 groups, translucent shade resin obtained higher µTBS than opaque shade resin. Using SE and BF, the 350 mW/cm 2 group in translucent shade resin was higher µTBS than the 600 mW/cm 2 group in opaque shade resin, while TS showed no different µTBS between them.

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Characteristics of visible-light-activated composite systems

Cited by 166 publications

References 0 publications

Microhardness of Bulk-Fill Composite Materials

Microhardness of Bulk-Fill Composite Materials

Influence of thickness on the degree of cure of composite resin core material

The influence of light intensities irradiated directly and indirectly through resin composite to self-etch adhesives on dentin bonding

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