Comparison of flexural properties and cytotoxicity of interim materials printed from mono-LCD and DLP 3D printers

Chen, Hsuan; Cheng, Dong; Huang, Shou Chieh; Lin, Yu‐Chi

doi:10.1016/j.prosdent.2020.09.003

Cited by 43 publications

(52 citation statements)

References 9 publications

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“…In the present study, the flexural strength of the 3D printed specimens increased gradually until 120 min of postcuring time, although there was no significant difference for postcuring times of longer than 60 min (Figure 3B). Another study also found that the flexural strength increased with the postcuring time [34]. In our study the flexural strength increased abruptly compared with the GS group after 15 min of postcuring.…”

Section: Discussionsupporting

confidence: 68%

Effects of Postcuring Temperature on the Mechanical Properties and Biocompatibility of Three-Dimensional Printed Dental Resin Material

et al. 2021

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Three-dimensional (3D) printing is an attractive technology in dentistry. Acrylic-based 3D printed resin parts have to undergo postcuring processes to enhance their mechanical and biological properties, such as UV-light and thermal polymerization. However, no previous studies have revealed how the postcuring temperature influences the biocompatibility of the produced parts. Therefore, we postprocessed 3D printed denture teeth resin under different postcuring temperatures (40, 60 and 80 °C) for different periods (15, 30, 60, 90 and 120 min), and evaluated their flexural properties, Vickers hardness, cell cytotoxicity, cell viability, and protein adsorption. In addition, confocal laser scanning was used to assess the condition of human gingival fibroblasts. It was found that increasing the postcuring temperature significantly improved the flexural strength and cell viability. The flexural strength and cell viability were 147.48 ± 5.82 MPa (mean ± standard deviation) and 89.51 ± 7.09%, respectively, in the group cured at 80 °C for 120 min, which were higher than the values in the 40 and 60 °C groups. The cell cytotoxicity increased in the 40 °C groups and for longer cultivation time. Confocal laser scanning revealed identifiable differences in the morphology of fibroblasts. This study has confirmed that the postcuring temperature influences the final mechanical and biological properties of 3D printed resin.

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Section: Discussionsupporting

confidence: 68%

Effects of Postcuring Temperature on the Mechanical Properties and Biocompatibility of Three-Dimensional Printed Dental Resin Material

et al. 2021

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“…Although DLP and LCD printing are operated under similar mechanisms, their conditions for proper operation are different. For LCD printers to have similar mechanical properties to DLP printers, more powerful or longer post-polymerization processes are required [ 6 ]. In this study, there was no specific control on the post-polymerization scheme, so the LCD restorations may not have acquired sufficient mechanical properties to endure shrinkage.…”

Section: Discussionmentioning

confidence: 99%

“…However, its biggest disadvantage is that it is expensive and limited to small-sized models. On the other hand, the LCD technique is also based on photo-polymerization but uses liquid crystals in imaging, rather than a light projector in DLP [ 6 ]. Compared to the other 3D printing techniques, the LCD technique is cheap and has good resolution, but has been known to have a short service life [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, comparisons on the products of DLP and LCD-type printers have hardly been made. One study showed that DLP and LCD-type printers could print products of similar mechanical and biological properties if several adjustments in polymerization time and intensity were performed [ 6 ]. Therefore, it may be necessary to print temporary restorations using commonly used DLP and LCD techniques and study their accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Dimensional Accuracy Evaluation of Temporary Dental Restorations with Different 3D Printing Systems

et al. 2021

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With the advent of 3D printing technologies in dentistry, the optimization of printing conditions has been of great interest, so this study analyzed the accuracy of 3D-printed temporary restorations of different sizes produced by digital light processing (DLP) and liquid crystal display (LCD) printers. Temporary restorations of 2-unit, 3-unit, 5-unit, 6-unit, and full-arch cases were designed and printed from a DLP printer using NextDent C&B or an LCD printer using Mazic D Temp (n = 10 each). The restorations were scanned, and each restoration standard tessellation language (STL) file was superimposed on the reference STL file, by the alignment functions, to evaluate the trueness through whole/point deviation. In the whole-deviation analysis, the root-mean-square (RMS) values were significantly higher in the 6-unit and full-arch cases for the DLP printer and in the 5-unit, 6-unit, and full-arch cases for the LCD printer. The significant difference between DLP and LCD printers was found in the 5-unit and full-arch cases, where the DLP printer exhibited lower RMS values. Color mapping demonstrated less shrinkage in the DLP printer. In the point deviation analysis, a significant difference in direction was exhibited in all the restorations from the DLP printer but only in some cases from the LCD printer. Within the limitations of this study, 3D printing was most accurate with less deviation and shrinkage when a DLP printer was used for short-unit restorations.

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“…Most of these methods are capable of working on multiple pieces simultaneously, which makes them time efficient (7,9) . The most common AM techniques used in dentistry are stereolithography (SLA), digital light processing (DLP), liquid crystal display (LCD), material jetting (MJ), selective laser sintering (SLS) (10)(11)(12) . The CAD data files are exported in a universal exchange format Standard Tessellation Language (STL) (13) The same file format could be used for subtractive and additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermo-mechanical Loading on The Fracture Resistance of Implant-Supported Provisional FDP Fabricated by CAD/CAM and 3D Printing: An in-vitro study

Bayoumi

Shokry

Mohammed

2022

Al-Azhar Journal of Dental Science

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Objective: This study evaluated the effect of thermo-mechanical cyclic loading (TMCL) on the fracture resistance of Implant-Supported Provisional Fixed Dental Prosthesis (ISP-FDP) fabricated by CAD/CAM and 3D printing. Material and Methods: Thirty ISP-FDPs were fabricated using 3D printing C&B MFH (Crown & Bridge Micro-filed Hybrid) and CAD/CAM. The samples were divided into two main groups of 15 samples according to fabrication technique. Each main group was divided into three equal sub-groups according to the duration of thermo-mechanical cyclic loading (TMCL). The fracture resistance was then measured for all groups. Results: Two-way Analysis of Variance (ANOVA) showed that the fabrication technique (regardless of TMCL) had a statistically significant effect on mean fracture resistance (P-value <0.001, Effect size = 0.479). Thermo-mechanical cyclic loading (regardless of fabrication technique) had a statistically significant effect on mean fracture resistance (P-value <0.001, Effect size = 0.743). The interaction between the two variables had a statistically significant effect on mean fracture resistance (P-value = 0.014, Effect size = 0.299). Since the interaction between the variables is statistically significant, so the variables are dependent upon each other. Conclusion: Fabrication technique impacted the fracture resistance of ISP-FDP. Thermo-mechanical cyclic loading caused degradation of mechanical properties in both materials. Both fabrication techniques offer a provisional prosthesis that can withstand normal functional loads for extended healing durations.

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Comparison of flexural properties and cytotoxicity of interim materials printed from mono-LCD and DLP 3D printers

Cited by 43 publications

References 9 publications

Effects of Postcuring Temperature on the Mechanical Properties and Biocompatibility of Three-Dimensional Printed Dental Resin Material

Effects of Postcuring Temperature on the Mechanical Properties and Biocompatibility of Three-Dimensional Printed Dental Resin Material

Dimensional Accuracy Evaluation of Temporary Dental Restorations with Different 3D Printing Systems

Effect of Thermo-mechanical Loading on The Fracture Resistance of Implant-Supported Provisional FDP Fabricated by CAD/CAM and 3D Printing: An in-vitro study

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