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In this study, the effects of polyimide (PI) content and postcuring on thermal and mechanical properties in PI and epoxy (EP) blending systems were investigated. EP/PI (EPI) blending reduced the crosslinking density and improved the flexural and impact strength due to ductility. On the other hand, in the postcuring of EPI, the thermal resistance improved due to the increased crosslinking density and the flexural strength increased by up to 57.89% due to the enhanced stiffness, but the impact strength decreased by up to 59.54%. EPI blending induced the improvement in the mechanical properties of EP, and the postcuring process of EPI was shown to be an effective method to improve heat resistance. It was confirmed that EPI blending induces improvement in the mechanical properties of EP, and the postcuring process of EPI is an effective method for improving heat resistance.
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http://dx.doi.org/10.3390/polym15051072 | DOI Listing |
J Funct Biomater
July 2025
Advanced Dental Device Development Institute (A3DI), Kyungpook National University, Daegu 41940, Republic of Korea.
The dimensional accuracy of the intaglio surface of complete dentures fabricated using liquid crystal display (LCD) three-dimensional (3D) printing might be influenced by the build angle and post-processing storage conditions. This study evaluated the effect of build angle and natural light exposure duration on the intaglio surface trueness of maxillary complete denture bases. Standardized denture base designs (2 mm uniform thickness) were fabricated using an LCD 3D printer (Lilivis Print; Huvitz, Seoul, Republic of Korea) at build angles of 0°, 45°, and 90° ( = 7 per group).
View Article and Find Full Text PDFCureus
July 2025
Department of Orthodontics, Adhiparasakthi Dental College and Hospital, Chennai, IND.
Introduction: Excessive intensity of light emitted from light-emitting diode (LED) curing units used during orthodontic bonding procedures can induce thermal changes within the pulp chamber, potentially leading to pulpal inflammation or damage. The degree of this thermal effect may vary based on the type and power output of the curing light used. This study aimed to determine the amount of heat generated by different LED curing lights during orthodontic bonding and to evaluate the associated histopathological changes in pulpal tissue.
View Article and Find Full Text PDFJ Mech Behav Biomed Mater
August 2025
Graduate Program in Dentistry, Universidade Federal de Pelotas, Brazil. Electronic address:
This study evaluated how resin type, printer technology, and post-curing time influence the mechanical and thermal properties of 3D-printed polymers for dental restorations. Bar-shaped specimens were printed with digital light processing (DLP) and liquid crystal display (LCD) printers using provisional and long-term resins. The post-curing times tested were 5 and 30 min.
View Article and Find Full Text PDFBraz Dent J
August 2025
Operative Dentistry Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Purpose: To investigate the effect of the application of a glycerin gel on the surface of 3D printing resins (3DPRs) samples as a physical barrier, avoiding the inhibition layer formation caused by the presence of atmospheric oxygen during the post-curing process on their physical properties of 3DPRs.
Materials And Methods: Two 3DPRs were tested: one for "provisional" restorations (Prizma 3D Bio Prov) and another for indirect "permanent" restorations (Prizma 3D Bio Crown). Samples of 3DPRs were printed for flexural strength, elastic modulus, and Knoop microhardness analysis (n = 10).
Sci Rep
August 2025
Dental Biomaterials Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
Unlabelled: Denture base fabrication has advanced with the introduction of computer-aided design and manufacturing (CAD-CAM) techniques, such as subtractive milling and additive 3D printing. However, concerns persist regarding the mechanical performance of 3D-printed denture bases. This systematic review and meta-analysis aimed to evaluate and compare the flexural strength (FS), surface hardness, fracture toughness, and impact strength of 3D-printed denture bases with those produced by milling and conventional methods.
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