PMID- 35935721 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20220809 IS - 1013-9052 (Print) IS - 1658-3558 (Electronic) IS - 1013-9052 (Linking) VI - 34 IP - 3 DP - 2022 Mar TI - Effects of aging and light-curing unit type on the volume and internal porosity of bulk-fill resin composite restoration. PG - 243-248 LID - 10.1016/j.sdentj.2022.01.004 [doi] AB - This study explores the effects of aging (thermal cycling and cyclic loading-TC/CL) and different light-curing unit (LCU) types on the volume characteristics and internal porosity of a bulk-fill resin-based composite restoration. Occlusal cavities (4 x 4 x 3 mm) were prepared on extracted human molars (n = 5). Tetric N-Bond Universal was applied, and the cavities were restored using Tetric-N-Ceram Bulk Fill. Photoactivation was performed using a quartz-tungsten halogen (QTH) or a multiple-emission peak light-emitting diode (MLED). Digital images for all restorations were obtained using microcomputed tomography (micro-CT) before (baseline) and after (post-aging) TC/CL (5,000 TC cycles in 5-55 degrees C baths and a dwell time of 30 s followed by 10,000 sinusoidal CL load cycles in an Instron B3000 at 2 Hz and 10-110 N) and storage (37 degrees C) for three months. For the micro-CT analysis, three-dimensional images were used to determine the restoration volume and internal porosity. Data were analyzed using a two-way ANOVA and Tukey's test (p < 0.05). Restorations photoactivated with QTH exhibited a higher object volume than the LED group at baseline and in post-aging conditions without any significant differences in the other evaluated characteristics. All volume/porosity characteristics increased considerably after TC/CL aging, except for the object volume of the QTH group and the closed porosity of the MLED group. The change in all the volume/porosity characteristics between both LCU groups after TC/CL were not significantly different. Thus, the aging process simulated herein increased the volume and porosity characteristics of the bulk-fill restoration, and no significant differences were obtained between the QTH and MLED equipment. CI - (c) 2022 The Authors. FAU - Al-Zain, Afnan O AU - Al-Zain AO AD - Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P. O. Box 80209, Jeddah 21589, Saudi Arabia. FAU - Alboloshi, Elaf A AU - Alboloshi EA AD - Faculty of Dentistry, King Abdulaziz University, P. O. Box 80209, Jeddah 21589, Saudi Arabia. FAU - Amir, Walaa A AU - Amir WA AD - Faculty of Dentistry, King Abdulaziz University, P. O. Box 80209, Jeddah 21589, Saudi Arabia. FAU - Alghilan, Maryam A AU - Alghilan MA AD - Restorative and Prosthetic Dental Sciences Department, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia. FAU - Munchow, Eliseu A AU - Munchow EA AD - Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre RS, Brazil. LA - eng PT - Journal Article DEP - 20220119 PL - Saudi Arabia TA - Saudi Dent J JT - The Saudi dental journal JID - 9313603 PMC - PMC9346940 OTO - NOTNLM OT - Bulk-filling technique OT - Cyclic loading OT - Light-emitting diode OT - Micro-computed tomography OT - Quartz-tungsten-halogen OT - Thermal cycling COIS- The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. EDAT- 2022/08/09 06:00 MHDA- 2022/08/09 06:01 PMCR- 2022/01/19 CRDT- 2022/08/08 03:37 PHST- 2021/04/07 00:00 [received] PHST- 2022/01/04 00:00 [revised] PHST- 2022/01/12 00:00 [accepted] PHST- 2022/08/08 03:37 [entrez] PHST- 2022/08/09 06:00 [pubmed] PHST- 2022/08/09 06:01 [medline] PHST- 2022/01/19 00:00 [pmc-release] AID - S1013-9052(22)00012-8 [pii] AID - 10.1016/j.sdentj.2022.01.004 [doi] PST - ppublish SO - Saudi Dent J. 2022 Mar;34(3):243-248. doi: 10.1016/j.sdentj.2022.01.004. Epub 2022 Jan 19.