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dc.contributor.authorMouhat, Mathieu
dc.contributor.authorMercer, James
dc.contributor.authorStangvaltaite, Lina
dc.contributor.authorØrtengren, Ulf Thore
dc.date.accessioned2017-03-06T10:53:24Z
dc.date.available2017-03-06T10:53:24Z
dc.date.issued2016-10-01
dc.description.abstractObjectives:<br>To 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.<br> Materials and methods:<br>Three 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.<br> Results:<br>Maximum 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.<br> Conclusions:<br>At 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.<br> Clinical relevance:<br>Risk 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.en_US
dc.description.sponsorshipThe study was supported by grants from the Norwegian Directorate of Health (project number 14/1493-26).en_US
dc.descriptionSource: <a href=http://dx.doi.org/10.1007/s00784-016-1962-5>doi: 10.1007/s00784-016-1962-5</a>en_US
dc.identifier.citationMouhat, M., Mercer, J., Stangvaltaite, L. et al. Clin Oral Invest (2016). doi:10.1007/s00784-016-1962-5en_US
dc.identifier.cristinIDFRIDAID 1389968
dc.identifier.doi10.1007/s00784-016-1962-5
dc.identifier.issn1432-6981
dc.identifier.issn1436-3771
dc.identifier.urihttps://hdl.handle.net/10037/10434
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.relation.journalClinical Oral Investigations
dc.relation.urihttp://link.springer.com/article/10.1007%2Fs00784-016-1962-5
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Medisinske Fag: 700::Klinisk odontologiske fag: 830en_US
dc.subjectVDP::Medical disciplines: 700::Clinical dentistry disciplines: 830en_US
dc.titleLight-curing units used in dentistry: factors associated with heat development – potential risk for patientsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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