Impact of different post-polymerization protocols on the material properties of three printed dental resins

Gekle, Sophie; Mayinger, Felicitas ; Kreitmair, Ursula; Reymus, Marcel ; Hoffmann, Moritz und Stawarczyk, Bogna (2025): Impact of different post-polymerization protocols on the material properties of three printed dental resins. In: Journal of the Mechanical Behavior of Biomedical Materials, Bd. 172, 107164

Abstract

Objectives

To investigate the influence of different post-polymerization protocols (PP) on polymerization depth and resultant degree of conversion (DC), Martens hardness (HM), flexural strength (FS) and elastic modulus (EM) of 3D-printed specimens with and without aging regimes.

Methods

Specimens of a specific geometry (N = 720) were 3D printed from two resins for permanent applications (VAR=Varseo Smile Crownplus, BEGO Medical; CRO= Crowntec, Saremco Dental), and one resin for temporary applications (FRE=Freeprint temp, Detax). They underwent five PP's, divided into three LED-groups (PP 1: 385 nm, 76 mW/cm2, 180 s; PP 2: 400 nm, 77 mW/cm2, 180 s; PP 3: 460 nm, 49 mW/cm2, 180 s) and two flash curing groups (PP 4: 37 mW/cm2, ten flashes per second, pulse duration 100 μs, curing period 2000 flashes/200 ms; PP 5: 90 mW/cm2, ten flashes per second, pulse duration 100 μs, curing period 2000 flashes/200 ms). DC, HM, FS and EM were tested initially and after thermal cycling (10.000x, 5/55 °C) and within three different depths (0 mm, 2 mm, 4 mm). Data were analyzed with Kolmogorov-Smirnov, Kruskal-Wallis, Mann-Whitney-U test, Wilcoxon signed-rank test and Spearman's correlation (p < 0.05).

Results

PP 5 consistently showed high values for both aging regimes, while PP 3 presented the lowest results. Artificial aging increased the properties for most groups, some decreased. For DC 25/30 PP-groups and HM 27/30 PP-groups showed higher values for 0 mm depths in comparison with 2 mm and 4 mm depths.

Significance

Post-polymerization enhances the properties of the tested specimens intended for fixed dental prostheses (FDPs). PP 5 is recommended because it consistently resulted in highest DC, HM, FS, and EM across most groups, especially when combined with depths of 0 mm for DC and HM. Depths of 2 mm and 4 mm mostly resulted in lower values. Among LED groups, wavelengths of 385 nm and 400 nm are recommended for all materials, while wavelength of 460 nm seems not advisable.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin > Klinikum der LMU München > Poliklinik für Zahnärztliche Prothetik
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 17516161
• Sprache: Englisch