Effects of post‐curing light intensity on the trueness, compressive strength, and resin polymerization characteristics of 3D‐printed 3‐unit fixed dental prostheses
Year: 2024
Type: article
Abstract: Purpose To investigate the effect of different post‐curing light intensities on the trueness, compressive strength, and resin polymerization of 3D‐printed 3‐unit fixed dental prostheses (FPD). Materials and Methods A total of 60 specimens were prepared to support a 3‐unit FDP with a deep chamfer marginal design, utilizing computer‐aided design and computer‐aided manufacturing (CAD‐CAM) technology. Light‐polymerizing FDP resin with varying light intensities (105, 210, 420, and 840 mW/cm 2 ) was employed for 10 min. Subsequently, trueness assessment, fracture load testing, scanning electron microscopy (SEM) surface examination, and Fourier‐Transform Infrared (FTIR) analysis were conducted. A one‐way analysis of variance (ANOVA) was performed to ascertain the differences between the experimental groups ( p < 0.05). Results The group exposed to 210 mW/cm 2 showed the highest trueness (57.6 ± 2.1 µm), while the 840 mW/cm 2 group had the highest deviation (79.3 ± 2.7 µm) ( p < 0.001). Significant differences in fracture resistance were found between groups ( p < 0.001), with mean fracture strengths of 1149.77 ± 67.81 N, 1264.92 ± 39.06 N, 1331.34 ± 53.62 N, and 1439.93 ± 34.58 N for light intensities of 105, 210, 420, and 840 mW/cm 2 , respectively ( p < 0.001). The resin polymerization analysis shows a peak intensity surge at 3579 cm −1 for O‐H and C‐H stretching vibrations, except in samples exposed to 105 mw/cm 2 light, with the lowest peak at 2890 cm −1 . The performance of resin polymerization is most significant under the condition of 840 mW/cm 2 . Conclusion The light intensity of 210 mW/cm 2 exhibited the highest trueness, while the 840 mW/cm 2 group showed the highest deviation. However, the light intensity of 840 mW/cm 2 demonstrated the highest compressive strength. Furthermore, polymerization occurred at all post‐treatment light intensities except 105 mW/cm 2 . These findings indicate that while low‐intensity usage offers greater trueness, high‐intensity usage provides better compressive strength and polymerization. Therefore, 210 mW/cm 2 could be the recommended solution for post‐curing.
Source: Journal of Prosthodontics
DOI: 10.1111/jopr.13951
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: bronze
OpenAlex ID: W4402529411