{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,30]],"date-time":"2026-10-30T00:03:21Z","timestamp":1793318601541,"version":"4.5.0"},"reference-count":71,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2023,3,25]],"date-time":"2023-03-25T00:00:00Z","timestamp":1679702400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Objectives: the aim of this study was to examine the stress distribution of enamel, dentin, and restorative materials in sound first molar teeth with restored cavities with conventional resin composites and bulk\u2013fill composites, as well as to determine their fracture lifetimes by using the three-dimensional finite element stress analysis method. Materials and Methods: an extracted sound number 26 tooth was scanned with a dental tomography device and recorded. Images were obtained as dicom files, and these files were transferred to the Mimics 12.00 program. In this program, different masks were created for each tooth tissue, and the density thresholds were adjusted manually to create a three-dimensional image of the tooth, and these were converted to a STL file. The obtained STL files were transferred to the Geomagic Design X program, and some necessary adjustments, such as smoothing, were made, and STP files were created. Cavity preparation and adhesive material layers were created by transferring STP files to the Solidworks program. Finally, a FE model was created in the ABAQUS program, and stress distributions were analyzed. Results: when the bulk\u2013fill composite and conventional resin composite materials were used in the restoration of the cavity, the structures that were exposed to the most stress as a result of occlusal forces on the tooth were enamel, dentin, restorative material, and adhesive material. When the bulk\u2013fill composite material was used in restoration, while the restorative material had the longest fracture life as a result of stresses, the enamel tissue had the shortest fracture life. When the conventional resin composite material was used as the restorative material, it had the longest fracture life, followed by dentin and enamel. Conclusion: when the bulk\u2013fill composite material was used instead of the conventional resin composite material in the cavity, the stress values on enamel, dentin, and adhesive material increased as a result of occlusal forces, while the amount of stress on the restorative material decreased. In the fracture analysis, when the bulk\u2013fill composite material was used instead of the conventional resin composite material, a decrease in the number of cycles required for the fracture of enamel, dentin, and restorative materials was observed as a result of the forces generated in the oral cavity.<\/jats:p>","DOI":"10.3390\/polym15071637","type":"journal-article","created":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T01:38:36Z","timestamp":1679881116000},"page":"1637","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Teeth Restored with Bulk\u2013Fill Composites and Conventional Resin Composites; Investigation of Stress Distribution and Fracture Lifespan on Enamel, Dentin, and Restorative Materials via Three-Dimensional Finite Element Analysis"],"prefix":"10.3390","volume":"15","author":[{"given":"Hakan Yasin","family":"G\u00f6nder","sequence":"first","affiliation":[{"name":"Department of Restorative Dentistry, Faculty of Dentistry, Necmettin Erbakan University, Baglarbasi Street No: 4 Meram\/Konya, Konya 42090, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4506-8506","authenticated-orcid":false,"given":"Reza","family":"Mohammadi","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, University of Zanjan, Zanjan 45371-38791, Iran"},{"name":"Faculty of Dentistry, Necmettin Erbakan University, Baglarbasi Street No: 4 Meram Konya, Konya 42090, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8486-7725","authenticated-orcid":false,"given":"Abdulkadir","family":"Harmankaya","sequence":"additional","affiliation":[{"name":"Department of Restorative Dentistry, Faculty of Dentistry, Necmettin Erbakan University, Baglarbasi Street No: 4 Meram\/Konya, Konya 42090, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u0130brahim Burak","family":"Y\u00fcksel","sequence":"additional","affiliation":[{"name":"Department of Oral Diagnose and Radiology, Faculty of Dentistry, Necmettin Erbakan University, Baglarbasi Street No: 4 Meram Konya, Konya 42090, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasemin Derya","family":"Fidanc\u0131o\u011flu","sequence":"additional","affiliation":[{"name":"Department of Pediatric Dentistry, Faculty of Dentistry, Necmettin Erbakan University, Konya 42090, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Said","family":"Karabekiro\u011flu","sequence":"additional","affiliation":[{"name":"Department of Restorative Dentistry, Faculty of Dentistry, Necmettin Erbakan University, Konya 42090, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,25]]},"reference":[{"key":"ref_1","unstructured":"Fejerskov, O., Kidd, E.A.M., and Kidd, E. 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