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Influence of postwashing process on the elution of residual monomers, degree of conversion, and mechanical properties of a 3D printed crown and bridge materials

 Gan Jin  ;  Hanna Gu  ;  Minhee Jang  ;  Enkhjargal Bayarsaikhan  ;  Jung-Hwa Lim  ;  June-Sung Shim  ;  Keun-Woo Lee  ;  Jong-Eun Kim 
 DENTAL MATERIALS, Vol.38(11) : 1812-1825, 2022-11 
Journal Title
Issue Date
Composite Resins* ; Crowns* ; Ethers ; Materials Testing ; Methacrylates ; Polyethylene Glycols ; Polymethacrylic Acids ; Printing, Three-Dimensional ; Water
3D printing ; Degree of conversion ; Mechanical properties ; Photopolymer resin ; Postwashing ; Ultrasonic
Objectives: This study aimed to determine the effects of the postwashing method and time on the mechanical properties and biocompatibility of three-dimensional (3D) printed crown and bridge resin.

Methods: DLP (digital light processing)-printed specimens produced from Nextdent crown & bridge (C&B) resins were washed separately using an ultrasonic bath and rotary washer with TPM (tripropylene glycol monomethyl ether) for 3 min, 6 min, 10 min, 20 min, and 1 h. Postcuring was applied for 30 min to each specimen after the washing process. The flexural strength, Vickers hardness, water sorption and solubility, degree of conversion (DC), elution of residual monomers, and biocompatibility of the specimens were evaluated.

Results: The ultrasonic bath showed greater washing efficacy by reducing the residual HEMA (2-hydroxyethyl methacrylate) from 2.0634 ppm to 0.1456 ppm and reducing the residual TEGDMA (triethylene glycol dimethacrylate) from 1.4862 ppm to 0.1484 ppm. With prolonged washing, the flexural strength significantly decreased from 129.67 ± 6.66 MPa (mean±standard deviation) to 103.17 ± 7.20 MPa, while the Vickers hardness increased slightly for the first 6 min and then decreased thereafter significantly. The DC was 87.78 ± 1.34% after 3 min and then gradually decreased with extended washing time. The cytotoxicity significantly decreases with the increment of the washing time.

Significance: The washing effect on the elution of residual monomers was better for an ultrasonic bath than for a rotary washer. Extending the washing time reduces the mechanical properties and cytotoxicity of the Nextdent C&B resin.
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2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jong Eun(김종은) ORCID logo https://orcid.org/0000-0002-7834-2524
Shim, June Sung(심준성) ORCID logo https://orcid.org/0000-0003-1428-0122
Lee, Keun Woo(이근우) ORCID logo https://orcid.org/0000-0002-3153-190X
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