Color alterations, flexural strength, and microhardness of 3D printed resins for fixed provisional restoration using different post-curing times

Soto‐Montero, Jorge; Castro, Eduardo Fernandes de; Romano, Beatriz de Cássia; Nima, Gabriel; Shimokawa, Carlos Alberto Kenji; Giannini, Marcelo

doi:10.1016/j.dental.2022.06.023

Cited by 25 publications

(6 citation statements)

References 36 publications

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“…In order to finalize the polymerization process, the 3D-printed objects should be rinsed with a solvent to remove unpolymerized resin and then placed in a light polymerization chamber [ 25 , 26 ]. Several studies [ 27 , 28 , 29 , 30 , 31 ] that investigated the post-curing method for 3D printing using temporary prostheses and denture base materials suggested that the post-curing method would have an impact on the mechanical properties of those materials. A previous report indicated that stroboscopic post-curing at a nitrogen gas (N 2 ) atmosphere could improve the degree of conversion of a 3D printing material for temporary restorations [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material

Wada

Gibreel

et al. 2022

Polymers

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Although three-dimensional (3D) printing is clinically convenient to fabricate occlusal splints, it is still unclear how the post-curing method and the printer type can affect 3D-printed splints. This study aimed to evaluate the effect of stroboscopic post-curing at a nitrogen gas (N2) atmosphere versus post-curing in an air atmosphere, as well as the printer type (liquid crystal display (LCD) and digital light processing (DLP)) on the mechanical properties of a 3D-printed hard-type occlusal splint material. Flexural strength, flexural modulus, Vickers hardness number (VHN), fracture toughness, degree of double bond conversion (DC), 3D microlayer structure, water sorption, and water solubility were evaluated. The post-curing method significantly affected all evaluated properties except fracture toughness and 3D microlayer structure, while the printer type significantly affected all evaluated properties except flexural strength and flexural modulus. VHN and DC were significantly higher, and the smoother surface was noticeably obtained when printed by LCD printer and post-cured at an N2 atmosphere. The current results suggested that the post-curing method and the printer type would play a role in the mechanical properties of the evaluated material and that the combination of post-curing at an N2 atmosphere and LCD printer could enhance its mechanical properties and surface smoothness.

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Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material

Wada

Gibreel

et al. 2022

Polymers

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show abstract

“…After the acquisition of 3D-printed objects, the unpolymerized resin should be removed using a solvent, followed by post-curing in a light polymerization chamber to finalize the polymerization [ 37 , 38 ]. The effect of the post-curing method on the mechanical properties of 3D-printed materials for denture base PMMA [ 39 , 40 ] and interim prostheses [ 41 , 42 ] has been previously investigated, suggesting that the mechanical properties of those materials would be affected by the post-curing method. Reymus et al reported that the post-curing methods affected the degree of conversion of 3D-printed interim prostheses, and stroboscopic post-curing in a nitrogen gas (N 2 ) atmosphere resulted in the highest degree of conversion [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of 3D Printer Type and Use of Protection Gas during Post-Curing on Some Physical Properties of Soft Occlusal Splint Material

Wada

Gibreel

et al. 2022

Polymers

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Despite the fact that three-dimensional (3D) printing is frequently used in the manufacturing of occlusal splints, the effects of the 3D printer type and post-curing methods are still unclear. The aim of this study was to investigate the effect of the printer type (digital light processing: DLP; and liquid crystal display: LCD) as well as the post-curing method with two different atmospheric conditions (air and nitrogen gas (N2)) on the mechanical and surface properties of 3D-printed soft-type occlusal splint material. The evaluated properties were flexural strength, flexural modulus, Vickers hardness (VHN), fracture toughness, degree of double bond conversion (DC%), water sorption, water solubility, and 3D microlayer structure. The printer type significantly affected all the evaluated properties. Flexural strength, flexural modulus, and fracture toughness were significantly higher when specimens were printed by a DLP printer, while VHN and DC% were significantly higher, and a smoother surface was noticeably obtained when printed by an LCD printer. The post-curing at an N2 atmosphere significantly enhanced all of the evaluated properties except water sorption, 3D microlayer structure, and fracture toughness. The current results suggested that the printer type and the post-curing methods would have an impact on the mechanical and surface properties of the evaluated material.

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“…In the case of 3D printers, an initial hardening of the resin occurs in the resin vat during the manufacturing process, by the light emitted from the printer screen; however, a post-curing step is required to promote the complementary polymerization of the objects and enhance the mechanical properties of the material. Since the properties of most 3d printing materials do not improve after 10 minutes of postcuring (7), the post-curing time was set as 10 minutes in our study.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of surface roughness of resin materials with different contents

Servi¹,

Kölüş²

2022

Int Dent Res

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Aim: The aim of this study is to compare the roughness level of the surfaces of polymerized temporary acrylic resin, standard 3D resin, temporary 3D resin materials with polished and unpolished conditions. Methodology: Thirty samples of 1 cm diameter and 5 mm height cylinders of temporary 3D resin (Alias C & B Temp, Dokuz Kimya, İstanbul, Türkiye) and standard 3D resin (Alias Sharp & Rigid, Dokuz Kimya, Dokuz Kimya, İstanbul, Türkiye) were produced with 3D printer (Photon Mono X, Anycubic). Residual resins were cleaned in Wash & Cure Plus (Anycubic) device using isopropyl alcohol and kept under UV light for 10 minutes in the same device to fully polymerize. Self-curing temporary acrylic resin (Imident, Imicryl, Konya, Türkiye) was prepared according to the manufacturer's instructions and 30 samples were prepared by transferring them to moulds of the same size. Half of the samples in each material were polished for 90 seconds with the same dentist using polishing paste (Universal Polishing Paste, Ivoclar Vivadent) (n=15). The surface of each sample was measured three times with a 120˚ angle difference using a profilometer (SJ-201, Mitutoyo, Kanagawa, Japan) and the average was taken. Levene test, t test, two-way ANOVA and Tukey test were used for statistical analysis. A p-value less than 0.05 was accepted for statistical significance. Results: Roughness values 1.9173±0.25078 Ra in the Unpolished Temporary 3D Resin group, 0.2807±0.13317 Ra in the Polished Temporary 3D Resin group, 0.7760±0.17175 Ra in the Unpolished Standard 3B Resin group, 0 in the Polished Standard 3D Resin group It was found to be 0.1887±0.08340 Ra, 2.4827±0.79651 Ra in the Unpolished Cold Acryl group, and 0.6307±0.22118 Ra in the Polished Cold Acryl group. Conclusion: The roughness of 3D printed materials is lower than that of conventional temporary acrylic resin and polishing significantly reduced roughness in all groups. How to cite this article: Servi T, Kölüş T. Evaluation of surface roughness of resin materials with different contents. Int Dent Res 2022;12(Suppl.1):120-3 https://doi.org/10.5577/intdentres.474 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

show abstract

Color alterations, flexural strength, and microhardness of 3D printed resins for fixed provisional restoration using different post-curing times

Cited by 25 publications

References 36 publications

Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material

Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material

Effect of 3D Printer Type and Use of Protection Gas during Post-Curing on Some Physical Properties of Soft Occlusal Splint Material

Evaluation of surface roughness of resin materials with different contents

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