PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 1002–1009

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract The aim of the present paper is to study the microleakage of wedge-shaped defects, filled with restorative materials of different groups. Thirty six human teeth (incisors, canines and premolars) with V-shaped defects, prepared on them, were used. The cavities were obturated with auto-cured resin-modified glass-ionomer cement (RMGIC), flowable photo-cured composite (FPC) and universal nanohybrid photo-cured composite (UPC). The microleakage was investigated by penetration of 2% methylene blue dye. The teeth were observed by light microscopy and the relative microleakage was calculated. It is established that the microleakege depends on the type of material and the application technique used. It is confirmed that the cavities, obturated with GIC, possess the highest relative microleakage 38.1% compared to the cavities, filled with photo-cured composites. The lowest relative microleakage of 18.2% is found in V-shaped defects, obturated with UPC. The relative microleakage of the cavities, filled with FPC, takes an intermediate position with 24.5%. As a result of this study, for successful filling of V-shaped defects with minimum microleakege, the universal nanohybrid composites can be recommended in application of incremental technique. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: V-shaped tooth defects; microleakage; glass-ionomer cement; flowable composite; universal nanohybrid composite. 1. Introduction Non-carious cervical lesions on the hard dental tissues (HDT) represent a change in the anatomical integrity and/or sensitivity of the HDT without the presence of a carious process (Hristova et al. (2018). These lesions are divided into wedge shaped defects, erosions, abrasions and dentin hypersensitivity. 1st Virtual European Conference on Fracture Investigation of microleakage in V-shaped tooth defects filled with different restorative materials Vesela Hristova, Tsanka Dikova*, Vladimir Panov Faculty of Dental Medicine, Medical University of Varna, 84 Tsar Osvoboditel Blvd, 9000 Varna, Bulgaria Abstract The aim of the present paper is to study the microleakage of wedge-shaped defects, filled with restorative materials of different groups. Thir y six human te th (inci ors, canines and premolars) with V-shape d fects, prepared on them, were used. The cavities were obtura ed with auto-cured re in-modifi d glass-ion mer cement (RMGIC), flowable ph to-cured composite (FPC) and universal n nohybrid photo-cured composite (UPC). The microleakage was investigated by p netration of 2% ethyl ne blue dye. The teeth were o served by light microscopy and the relative microleakage was calculated. It is es ablished that e micro eakege depends on th typ of mater al and the ap lication technique used. It is confirmed th t the cavities, obturated with GIC, poss ss the highest relativ microl akage 38.1% compared to the cavities, filled with p o o-cured composites. The lowest relative microleakage of 18.2% is found in V-shaped defects, b urated w th UPC. The relative microleakage of the cavities, filled with FPC, takes an intermediate positio wit 24.5%. As a result of this s udy, for successful filling f V-shaped d fects with minimum microleakege, th universal nanohybr d composite can be recommen ed in application of cremental t chnique. © 2020 The Authors. Published b ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integri y Society (ESIS) ExC K ywords: V-shap d tooth defects; microleakage; gl ss-ionomer cement; flowable composite; universal nanohybrid composite. 1. Introduction Non-carious cervical lesions on the hard dental tissues (HDT) represent a change in the anatomical integrity and/or sensitivity of the HDT without the presence of a car ous process (Hristova et al. (2018). These lesions are divided into wedge shaped d fects, erosions, abrasio s and dent n hy ers n itivity. 1st Virtual European Conference on Fracture Investigation of microleakage in V-shaped tooth defects filled with different restorative materials Vesela Hristova, Tsanka Dikova*, Vladimir Panov Faculty of Dental Medicine, Medical University of Varna, 84 Tsar Osvoboditel Blvd, 9000 Varna, Bulgaria

* Corresponding author. Tel.: +359-899-883-125. E-mail address: tsanka.dikova@mu-varna.bg * Corresponding author. Tel.: +359-899-883-125. E-mail address: tsanka.dikova@mu-varna.bg

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of t European Structural Integrity Soci ty (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.115