Effect of the irradiance distribution from light curing units on the local micro-hardness of the surface of dental resins

Haenel, Thomas; Hausnerová, Berenika; Steinhaus, Johannes; Price, Richard; Sullivan, Braden; Moeginger, Bernhard

doi:10.1016/j.dental.2014.11.003

Cited by 67 publications

(63 citation statements)

References 47 publications

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“…It presents 75% of filler particles per volume, a value that is notably higher than the others. Thus, as mentioned above, by increasing the filler content and, therefore, decreasing the flowability, the modulus of elasticity increases in the same proportion and the amount of organic matrix present in the composite is decreased 17 . This fact assists in a reduction in the polymerization contraction 18 .…”

Section: Discussionmentioning

confidence: 95%

Linear polymerization shrinkage of Bulk Fill resins

Correia¹,

Silva²,

Grangeiro³

et al. 2018

Rev. da Fac. de Odontologia, UPF

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Section: Discussionmentioning

confidence: 95%

Linear polymerization shrinkage of Bulk Fill resins

Correia¹,

Silva²,

Grangeiro³

et al. 2018

Rev. da Fac. de Odontologia, UPF

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“…Further, a laboratory bench model can never simulate the environmental conditions within the oral cavity. An additional consideration that has to be taken into account when comparing temperature distribution from different LED-LCUs relates to differences in the homogeneity of irradiance from the different TIPs [25, 26]. Price at al.…”

Section: Discussionmentioning

confidence: 99%

Light-curing units used in dentistry: factors associated with heat development—potential risk for patients

et al. 2016

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ObjectivesTo investigate how heat development in the pulp chamber and coronal surface of natural teeth with and without cusps subjected to irradiance using light-emitting diode (LED)–light-curing units (LCUs) is associated with (i) irradiance, (ii) time, (iii) distance, and (iv) radiant exposure.Materials and methodsThree different LED-LCUs were used. Their irradiance was measured with a calibrated spectrometer (BlueLight Analytics Inc., Halifax, Canada). An experimental rig was constructed to control the thermal environment of the teeth. The LED-LCU tip position was accurately controlled by a gantry system. Tooth surface temperature was measured by thermography (ThermaCAM S65 HS, FLIR Systems, Wilsonville, USA) and pulp chamber temperature with a thermocouple. LED-LCU tip distance and irradiation times tested were 0, 2, and 4 mm and 10, 20, and 30 s, respectively. Ethical permission was not required for the use of extracted teeth.ResultsMaximum surface and pulp chamber temperatures were recorded in tooth without cusps (58.1 °C ± 0.9 °C and 43.1 °C ± 0.9 °C, respectively). Radiant exposure explained the largest amount of variance in temperature, being more affected by time than irradiance.ConclusionsAt all combinations of variables tested, repeated measurements produced consistent results indicating the reliability of the method used. Increased exposure time seems to be the factor most likely to cause tissue damage.Clinical relevanceRisk of superficial tissue damage at irradiances >1200 mW/cm2 is evident. There is a risk of pulp damage when only thin dentin is left at higher irradiances (>1200 mW/cm2). Clinicians should be aware of LED-LCU settings and possible high temperature generated.

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“…Laser beam analyzers have been used to measure where the light is emitted from the curing light. 31,32,33,49,53,57,58 These cameras take a digital image of the light output and the power received by each pixel in the camera sensor is reported. Figure 36 illustrates two curing lights, one with a uniform light output and one with a "hot spots" of very bright light and "cold spots" where very little light comes from the light tip.…”

Section: Light Beam Uniformitymentioning

confidence: 99%

Light curing in dentistry and clinical implications: a literature review

et al. 2017

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Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the longterm outcome of their restorative procedures.

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Effect of the irradiance distribution from light curing units on the local micro-hardness of the surface of dental resins

Cited by 67 publications

References 47 publications

Linear polymerization shrinkage of Bulk Fill resins

Linear polymerization shrinkage of Bulk Fill resins

Light-curing units used in dentistry: factors associated with heat development—potential risk for patients

Light curing in dentistry and clinical implications: a literature review

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