Effect of initiator concentration, exposure time and particle size of the filler upon the mechanical properties of a light‐curing radiopaque dental composite

Krishnan, V. Kalliyana; Yamuna, V.

doi:10.1046/j.1365-2842.1998.00308.x

Cited by 38 publications

(22 citation statements)

References 7 publications

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“…It has been reported that the polymerization rate of photo-cure adhesive monomer is dependent on the type and concentration of the photoinitiators. 35,36 Camphorquinone, which is a common photoinitiator in composite resin and adhesive resin, could produce a synergistic effect when combined with another co-initiator and result in an improvement in polymerization conversion. 36 NB contains camphorquinone as a photoinitiator, whereas SE contains camphorquinone and another co-photoinitiator.…”

Section: Discussionmentioning

confidence: 99%

Effect of prolonged photo-irradiation time of three self-etch systems on the bonding to root canal dentine

Aksornmuang

Nakajima

Foxton

et al. 2006

Journal of Dentistry

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Section: Discussionmentioning

confidence: 99%

Effect of prolonged photo-irradiation time of three self-etch systems on the bonding to root canal dentine

Aksornmuang

Nakajima

Foxton

et al. 2006

Journal of Dentistry

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“…Many discussions have taken place about the variables that most influence this stress. According to previous studies, filler volume fraction, 24 polymerization shrinkage, 25 camphorquinone concentration, 26 amine concentration, 27 specimen geometry, 28 and curing method 29 are among many factors considered significant in the development of polymerization shrinkage stresses. With FEA, it is possible to isolate the variables of interest (eg, CF, geometry, volume, area, angle) and to study their individual or combined effects in cases where it is not possible or it is too difficult to perform in an in vitro experiment.…”

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confidence: 99%

Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

Tribst

Borges

Xavier

et al. 2014

Operative Dentistry

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Adhesive dentistry allows for the simple removal of decayed tissue to guide preparation design. Knowledge about differences in stress concentration within cavities can help in understanding the impact of shape and cavosurface angle of the cavity, optimizing the distribution of stress during the cure of the restorative material and improving the expected lifetime of the restoration. SUMMARYObjective: This study evaluated the effect of quantity of resin composite, C-factor, and geometry in Class V restorations on shrinkage stress after bulk fill insertion of resin using two-dimensional finite element analysis.Methods: An image of a buccolingual longitudinal plane in the middle of an upper first premolar and supporting tissues was used for modeling 10 groups: cylindrical cavity, erosion, and abfraction lesions with the same Cfactor (1.57), a second cylindrical cavity and abfraction lesion with the same quantity of resin (QR) as the erosion lesion, and then all repeated with a bevel on the occlusal cavosurface angle. The 10 groups were imported into Ansys 13.0 for two-dimensional finite element analysis. The mesh was built with 30,000 triangle and square elements of 0.1 mm in length for all the models. All materials were considered isotropic, homogeneous, elastic, and linear, and the resin composite shrinkage was simulated by thermal analogy. The maximum principal (MPS) and von Mises stresses (VMS) were analyzed for comparing the behavior of the groups.Results: Different values of angles for the cavosurface margin in enamel and dentin were obtained for all groups and the higher the angle, the lower the stress concentration. When the groups with the same C-factor and QR were compared, the erosion shape cavity showed the highest MPS and VMS values, and abfraction shape, the lowest. A cavosurface bevel decreased the stress values on the occlusal margin. The geometry factor overcame the effects of C-factor and QR in some situations.Conclusion: Within the limitations of the current methodology, it is possible to conclude that the combination of all variables studied influences the stress, but the geometry is the most important factor to be considered by the operator.

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“…The most popular photoinitiator among dental polymers is camphorquinone (CQ) [2,10,[20][21][22][23][24][25][26][27]. CQ has good absorption within the visible region of the light spectrum, with wavelength peak of 470 nm [10].…”

Section: Discussionmentioning

confidence: 99%

Influence of Different Photoinitiators on Polymerization Kinetics and Marginal Microleakage in Restorations using Photopolymerizable Dental Composites

Alvim

Campos

Vasconcellos

et al. 2017

Pesqui. bras. odontopediatria clín. integr.

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Objective: To evaluate the influence of four different photoinitiators on the polymerization kinetics and marginal microleakage in class V restorations using photopolymerizable dental composites. Material and Methods: Four photopolymerizable dental composites based on Bis-GMA (14.5 wt %), UDMA (6.5 wt %) and silanized filler particles (79 wt %) containing different photoinitiators were formulated. Camphorquinone (CQ)/amine, phenyl-propanedione (PPD), monoacylphosphine oxide (Lucirin ® TPO) and bisacylphosphine oxide (Irgacure ® 819) were used as photoinitiators. Sixteen intact human third molars were selected and divided into four groups. All teeth received class V cavity preparations in their buccal and lingual surfaces and were submitted to a dye leakage test. Data were independently analyzed for both enamel and dentin, and the results were assessed by a Kruskal-Walis test. The polymerization reactions of the four composites were evaluated by differential scanning calorimeter coupled with photocalorimeter accessory. Results: Lucirin ® TPO presented the highest scores for microleakage in enamel, whereas the other photoinitiators have not demonstrated statistical differences. The lowest scores were obtained for PPD in dentin while the highest scores have been achieved by Irgacure ® 819 and Lucirin ® TPO. Photocalorimetric measurements demonstrated a correlation between polymerization reaction rate and marginal leakage, showing that faster reactions cause greater marginal leakage. Conclusion: Marginal microleakage scores in photopolymerizable dental composites can be greatly influenced by different types of photoinitiators through their distinct reaction rates.

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Effect of initiator concentration, exposure time and particle size of the filler upon the mechanical properties of a light‐curing radiopaque dental composite

Cited by 38 publications

References 7 publications

Effect of prolonged photo-irradiation time of three self-etch systems on the bonding to root canal dentine

Effect of prolonged photo-irradiation time of three self-etch systems on the bonding to root canal dentine

Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

Influence of Different Photoinitiators on Polymerization Kinetics and Marginal Microleakage in Restorations using Photopolymerizable Dental Composites

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