Effect of Different Post-Curing Methods on the Degree of Conversion of 3D-Printed Resin for Models in Dentistry

Kirby, Scott; Pesun, Igor; Nowakowski, Anthony; França, Rodrigo

doi:10.3390/polym16040549

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…3). RGB-LED light source has been used as a light source for both intraoral and laboratory polymerization apparatus [4][5][6][7][8][9]. A flexible and waterproof substrate was essential for the current assembly.…”

Section: Discussionmentioning

confidence: 99%

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Improvement in working environment of wet rotary cast trimmer by means of light-emitting diode light bulbs

Kiuchi,

Imai

2024

Asian Pac J Dent

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Purpose:The aim of the present study was to evaluate the irradiance of light-emitting diode (LED) light bulbs seated around the abrasive grinding disc of a wet laboratory cast trimmer for the enhancement of environmental brightness. Methods: A total of 12 LED light bulbs were set up along the inner framework of a rotary cast trimmer. The irradiance of the bulbs was determined with a spectral radiometer. Results: The spectral irradiance mean of 12 LED light bulbs in the cast trimmer was 37.3 µW/cm 2 and the value was significantly greater than that of the control. The irradiance median of the 9787 LED light bulb varied from 640.3 µW/cm 2 for 0 mm distance to 79.4 µW/cm 2 for 200 mm distance. Analysis revealed that irradiance was not statistically affected by the bulb-sensor vertical distances within 50 mm. Conclusion:The working environment, especially brightness, around a dental stone cast placed on the trimmer stage can be improved considerably through the use of the LED light bulbs.

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Section: Discussionmentioning

confidence: 99%

“…Various light sources are candidates for this purpose. Light-emitting diode (LED) light bulbs have been used for both chair-side [4][5][6][7] and laboratory light polymerization units [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Improvement in working environment of wet rotary cast trimmer by means of light-emitting diode light bulbs

Kiuchi,

Imai

2024

Asian Pac J Dent

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Effects of post‐curing light intensity on the trueness, compressive strength, and resin polymerization characteristics of 3D‐printed 3‐unit fixed dental prostheses

Sahrir,

Lin,

Wang

et al. 2024

Journal of Prosthodontics

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PurposeTo 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 MethodsA 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/cm2) 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).ResultsThe group exposed to 210 mW/cm2 showed the highest trueness (57.6 ± 2.1 µm), while the 840 mW/cm2 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/cm2, 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/cm2 light, with the lowest peak at 2890 cm−1. The performance of resin polymerization is most significant under the condition of 840 mW/cm2.ConclusionThe light intensity of 210 mW/cm2 exhibited the highest trueness, while the 840 mW/cm2 group showed the highest deviation. However, the light intensity of 840 mW/cm2 demonstrated the highest compressive strength. Furthermore, polymerization occurred at all post‐treatment light intensities except 105 mW/cm2. These findings indicate that while low‐intensity usage offers greater trueness, high‐intensity usage provides better compressive strength and polymerization. Therefore, 210 mW/cm2 could be the recommended solution for post‐curing.

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Wear properties of acrylic dental material 3D printed via digital light processing: Influence of process settings

Vaezipour,

Shabgard,

Kazemi

2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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The digital light processing (DLP) is one of the additive manufacturing methods, renowned for its precision and efficiency, with wide-ranging applications, notably in dentistry. Recent advancements in photocurable resins and DLP technologies have profoundly influenced dentistry. Despite their common clinical use, some resins lack comprehensive empirical studies on their mechanical and wear properties. In addition, analyzing the wear resistance of dental materials manufactured via additive manufacturing is imperative for ensuring their prolonged durability and dependability within authentic oral settings. Profound comprehension of the manner in which these materials withstand abrasive forces ensures their capability to withstand the mechanical strains imposed by chewing and brushing activities, thereby preserving their structural robustness and functional efficacy. The aims of this research are to investigate the effect of DLP process parameter setting, including: layer thickness, exposure time, and light intensity, on the wear resistance of acrylate dental materials. Using a pin-on-disc apparatus, wear tests were conducted. A steel pin, with a diameter of 5 mm, moved linearly over the specimen surface under the speed of 15 m/min and applying a force of 20 N. Scanning electron microscopy (SEM) was employed to examine the worn surface and wear mechanisms. Additionally, Analysis of Variance (ANOVA) was utilized to assess parameter effects and correlations. The findings indicate that parameter configurations exert a considerable influence on wear resistance and represent a cost-effective avenue for enhancing the wear resistance of components produced through additive manufacturing. The results revealed a direct correlation between resin curing and wear resistance, with inadequate or excessive curing leading to increased wear rates. The samples with a layer thickness of 25 µm, exposure time of 7.2 s, and light intensity of 160 W/m2, exhibited the lowest wear rate (11 × 10−2 mm3/min). Conversely, samples with a layer thickness of 100 µm, exposure time of 2.8 s and light intensity of 160 W/m2, demonstrated the highest wear rate (55 × 10−2 mm3/min). Additionally, the analysis of variance confirmed correlations between parameters, noting a negative correlation between intensity and time parameters, and positive correlations among other inter-parameter correlations.

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Effect of Different Post-Curing Methods on the Degree of Conversion of 3D-Printed Resin for Models in Dentistry

Cited by 4 publications

References 23 publications

Improvement in working environment of wet rotary cast trimmer by means of light-emitting diode light bulbs

Improvement in working environment of wet rotary cast trimmer by means of light-emitting diode light bulbs

Effects of post‐curing light intensity on the trueness, compressive strength, and resin polymerization characteristics of 3D‐printed 3‐unit fixed dental prostheses

Wear properties of acrylic dental material 3D printed via digital light processing: Influence of process settings

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