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dc.contributor.authorYang, Jiawei
dc.contributor.authorAlgamaiah, Hamad; email: dr.algamaiah@gmail.com
dc.contributor.authorWatts, David C; email: david.watts@manchester.ac.uk
dc.date.accessioned2021-07-03T00:27:34Z
dc.date.available2021-07-03T00:27:34Z
dc.date.issued2021-06-15
dc.date.submitted2021-05-25
dc.identifierpubmed: 34144795
dc.identifierpii: S0109-5641(21)00188-3
dc.identifierdoi: 10.1016/j.dental.2021.06.008
dc.identifier.citationDental materials : official publication of the Academy of Dental Materials
dc.identifier.urihttp://hdl.handle.net/10034/625125
dc.descriptionFrom PubMed via Jisc Publications Router
dc.descriptionHistory: received 2021-05-25, revised 2021-06-01, accepted 2021-06-01
dc.descriptionPublication status: aheadofprint
dc.description.abstractThis study aimed to investigate the effects of (i) a high-irradiance (3s) light-curing protocol versus (ii) two standard-irradiance (10s) protocols on 2D temperature maps during intra-dental photo-irradiation within a molar cavity restored with either Ultra-Rapid Photo-Polymerized Bulk Fill (URPBF) composites or a pre-heated thermo-viscous bulk-fill composite, compared to a standard bulk-fill resin-based-composite (RBC). The specific objectives included visual assessment of the temperature maps and quantitative assessment of several temperature/time plots at four different locations. A caries-free lower first molar cavity served as a natural tooth mold. Resin composites were placed without intermediary adhesive. Two URPBF composites (PFill; PFlow) and one pre-heated thermo-viscous bulk-fill composite (Viscalor: VC) were compared to a contemporary bulk-fill composite (One Bulk Fill: OBF). Two LED-LCU devices were used: Bluephase PowerCure (PC) and Elipar S10 (S10), with three light-irradiation protocols (PC-3s, PC-10s and S10-10s). 2D temperature maps over the entire coronal area were recorded for 120 s during and after irradiation using a thermal imaging camera. Changes at four different levels were selected from the data sets: (0, 2 and 4 mm from the cavity top and at 1 mm below the dentin cavity floor). The maximum temperature attained (T ), the mean temperature rise (ΔT), the time (s) to reach maximum temperature and the integrated areas (°C s) under the temperature/time (T/t) plots were identified. Data were analysed via three-way ANOVA, One-way ANOVA, independent t-tests and Tukey post-hoc tests (p < 0.05). All RBCs showed qualitatively similar temperature-time profiles. PFlow reached T in the shortest time. PC-3s (3000 mW/cm ) generated comparable ΔT to S10-10s, except with PFill, where ΔT was greater. Despite the same irradiance (1200 mW/cm ), Elipar S10 led to higher T and ΔT compared to PC-10s. The highest T and ΔT were observed at the 2 mm level, and the lowest were at 1 mm depth into the underlying dentin. Coronal 2D temperature maps showed rises largely confined within the bulk-fill RBC materials, with maxima at 2 mm rather than 4 mm depth indicating some extent of thermal insulation for the underlying dentin and pulp. RBCs polymerized via different irradiation protocols showed similar temperature changes. With the PC-3s protocol - also with pre-heated VC - minimal temperature rises at 1 mm within dentin suggest their clinical safety when sufficient remaining dentin thickness is present. [Abstract copyright: Copyright © 2021 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.]
dc.languageeng
dc.sourceeissn: 1879-0097
dc.subjectBulk-fill resin composite
dc.subjectHigh-irradiance
dc.subjectPre-heating
dc.subjectThermal imaging
dc.subjectThermo-viscous composite
dc.subjectThermographic analysis
dc.subjectURPBF composites
dc.titleSpatio-temporal temperature fields generated coronally with bulk-fill resin composites: A thermography study.
dc.typearticle
dc.date.updated2021-07-03T00:27:34Z
dc.date.accepted2021-06-01


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