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CC BY 4.0 · Eur J Dent 2025; 19(01): 154-164
DOI: 10.1055/s-0044-1786866
Original Article

Effect of Postrinsing Times and Methods on Surface Roughness, Hardness, and Polymerization of 3D-Printed Photopolymer Resin

Awutsadaporn Katheng
1   Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
,
Wisarut Prawatvatchara
2   Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
,
Watcharapong Tonprasong
1   Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
,
Sahaprom Namano
3   Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
,
Paweena Kongkon
1   Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
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Abstract

Objectives This in vitro study investigated the effects of different postrinsing times and methods on the surface roughness, surface hardness, and degree of polymerization of materials manufactured via stereolithography (SLA).

Materials and Methods A total of 288 disk-shaped specimens were manufactured using an SLA three-dimensional (3D) printer. The specimens were randomly divided into nine groups (n = 32) based on rinsing times and methods. The groups were categorized into three rinsing methods: automated, ultrasonic, and hand washing, with rinsing times of 5, 10, and 15 minutes using a 99% isopropanol alcohol as a solvent. Linear roughness (Ra) and area roughness (Sa) were measured using a 3D confocal laser microscopy; the roughness morphology was evaluated by using scanning electron microscopy. Vickers hardness (VHN) tests were performed using a Vickers microhardness tester. Fourier-transform infrared spectrometry was used to determine the degree of conversion of treated specimens.

Statistical Analysis Data were statistically analyzed using two-way analysis of variance. The post hoc Tukey tests were conducted to compare the differences between groups (p < 0.05).

Results The choice of the rinsing time and method affected the surface properties of the SLA photopolymer resin. The 15 minutes of ultrasonic method exhibited the highest Ra scores (0.86 ± 0.1 µm), while the 15 minutes of automated method presented the highest Sa scores (1.77 ± 0.35 µm). For the VHN test, the 15 minutes of ultrasonic method displayed the highest VHN score (18.26 ± 1.03 kgf/mm2). For the degree of polymerization, the 15 minutes of automated method was initially identified as the most effective (87.22 ± 6.80).

Conclusion To facilitate the overall surface roughness, surface hardness, and degree of polymerization, the optimal choice of postprocessing rinsing time and method for achieving a clear photopolymer resin was determined to be the ultrasonic method with a rinsing time of 15 minutes.

Keywords

degree of polymerization - postrinsing method - postrinsing time - stereolithography - surface hardness - surface roughness


Publication History

Article published online:
17 May 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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  • References

  • 1 Revilla-León M, Özcan M. Additive manufacturing technologies used for processing Polymers: Current status and potential application in prosthetic dentistry. J Prosthodont 2019; 28 (02) 146-158
    CrossrefPubMedSearch in Google Scholar
  • 2 Katheng A, Kanazawa M, Iwaki M, Arakida T, Hada T, Minakuchi S. Evaluation of trueness and precision of stereolithography-fabricated photopolymer-resin dentures under different postpolymerization conditions: an in vitro study. J Prosthet Dent 2022; 128 (03) 514-520
    CrossrefPubMedSearch in Google Scholar
  • 3 Katheng A, Kanazawa M, Iwaki M, Minakuchi S. Evaluation of dimensional accuracy and degree of polymerization of stereolithography photopolymer resin under different postpolymerization conditions: an in vitro study. J Prosthet Dent 2021; 125 (04) 695-702
    CrossrefPubMedSearch in Google Scholar
  • 4 Tian Y, Chen C, Xu X. et al. A review of 3D printing in dentistry: technologies, affecting factors, and applications. Scanning 2021; 2021: 9950131
    CrossrefPubMedSearch in Google Scholar
  • 5 Piedra-Cascón W, Krishnamurthy VR, Att W, Revilla-León M. 3D printing parameters, supporting structures, slicing, and post-processing procedures of vat-polymerization additive manufacturing technologies: a narrative review. J Dent 2021; 109: 103630
    CrossrefPubMedSearch in Google Scholar
  • 6 Baroudi K, Ibraheem SN. Assessment of chair-side computer-aided design and computer-aided manufacturing restorations: a review of the literature. J Int Oral Health 2015; 7 (04) 96-104
    PubMedSearch in Google Scholar
  • 7 Xu Y, Xepapadeas AB, Koos B, Geis-Gerstorfer J, Li P, Spintzyk S. Effect of post-rinsing time on the mechanical strength and cytotoxicity of a 3D printed orthodontic splint material. Dent Mater 2021; 37 (05) e314-e327
    CrossrefPubMedSearch in Google Scholar
  • 8 Mayer J, Reymus M, Wiedenmann F, Edelhoff D, Hickel R, Stawarczyk B. Temporary 3D printed fixed dental prosthesis materials: impact of post printing cleaning methods on degree of conversion as well as surface and mechanical properties. Int J Prosthodont 2021; 34 (06) 784-795
    CrossrefPubMedSearch in Google Scholar
  • 9 Bardelcik A, Yang S, Alderson F, Gadsden A. The effect of wash treatment on the mechanical properties and energy absorption potential of a 3D printed polymethyl methacrylate (PMMA). Mater Today Commun 2021; 26 (01) 101728
    CrossrefSearch in Google Scholar
  • 10 Moslehifard E, Ghaffari T, Abolghasemi H, Maleki Dizaj S. Comparison of conventional pressure-packed and injection molding processing methods for an acrylic resin denture based on microhardness, surface roughness, and water sorption. Int J Dent 2022; 2022: 7069507
    CrossrefPubMedSearch in Google Scholar
  • 11 Al-Dulaijan YA, Alsulaimi L, Alotaibi R. et al. Comparative evaluation of surface roughness and hardness of 3D printed resins. Materials (Basel) 2022; 15 (19) 6822
    CrossrefPubMedSearch in Google Scholar
  • 12 Abed YA, Sabry HA, Alrobeigy NA. Degree of conversion and surface hardness of bulk-fill composite versus incremental-fill composite. Tanta Dent J 2015; 12 (02) 71-80
    CrossrefSearch in Google Scholar
  • 13 Galvão MR, Caldas SG, Bagnato VS, de Souza Rastelli AN, de Andrade MF. Evaluation of degree of conversion and hardness of dental composites photo-activated with different light guide tips. Eur J Dent 2013; 7 (01) 86-93
    PubMedSearch in Google Scholar
  • 14 Unkovskiy A, Bui PH, Schille C, Geis-Gerstorfer J, Huettig F, Spintzyk S. Objects build orientation, positioning, and curing influence dimensional accuracy and flexural properties of stereolithographically printed resin. Dent Mater 2018; 34 (12) e324-e333
    CrossrefPubMedSearch in Google Scholar
  • 15 Ammoun R, Dalal N, Abdulmajeed AA, Deeb GR, Bencharit S. Effects of two postprocessing methods onto surface dimension of in-office fabricated stereolithographic implant surgical guides. J Prosthodont 2021; 30 (01) 71-75
    CrossrefPubMedSearch in Google Scholar
  • 16 Katheng A, Kanazawa M, Komagamine Y, Iwaki M, Namano S, Minakuchi S. Effect of post-rinsing time and method on accuracy of denture base manufactured with stereolithography. J Adv Prosthodont 2022; 14 (01) 45-55
    CrossrefPubMedSearch in Google Scholar
  • 17 Mayer J, Stawarczyk B, Vogt K, Hickel R, Edelhoff D, Reymus M. Influence of cleaning methods after 3D printing on two-body wear and fracture load of resin-based temporary crown and bridge material. Clin Oral Investig 2021; 25 (10) 5987-5996
    CrossrefPubMedSearch in Google Scholar
  • 18 Mostafavi D, Methani MM, Piedra-Cascón W, Zandinejad A, Revilla-León M. Influence of the rinsing postprocessing procedures on the manufacturing accuracy of vat-polymerized dental model material. J Prosthodont 2021; 30 (07) 610-616
    CrossrefPubMedSearch in Google Scholar
  • 19 Lee BI, You SG, You SM, Kang SY, Kim JH. Effect of rinsing time on the accuracy of interim crowns fabricated by digital light processing: an in vitro study. J Adv Prosthodont 2021; 13 (01) 24-35
    CrossrefPubMedSearch in Google Scholar
  • 20 International Organization for Standardization (ISO). Dentistry—Base polymers—Part 1: Denture base polymers; ISO 20795–1:2013(en). Geneva, Switzerland: International Organization of Standardization (ISO); 2013. Accessed April 8, 2024 at: https://www.iso.org/obp/ui/#iso:std:iso:20795:-1:ed-2:v1:en
    Search in Google Scholar
  • 21 International Organization for Standardization. Geometrical product specifications (GPS) Surface texture: Areal. Part 2: Terms, definitions and surface texture parameters; ISO 25178–2:2012(en). Geneva, Switzerland: International Organization of Standardization (ISO); Accessed April 8, 2024 at: https://www.iso.org/standard/42785.html
  • 22 Lambart AL, Xepapadeas AB, Koos B, Li P, Spintzyk S. Rinsing postprocessing procedure of a 3D-printed orthodontic appliance material: Impact of alternative post-rinsing solutions on the roughness, flexural strength and cytotoxicity. Dent Mater 2022; 38 (08) 1344-1353
    CrossrefPubMedSearch in Google Scholar
  • 23 Park SM, Park JM, Kim SK, Heo SJ, Koak JY. Flexural Strength of 3D-printing resin materials for provisional fixed dental prostheses. Materials (Basel) 2020; 13 (18) 3970
    CrossrefPubMedSearch in Google Scholar
  • 24 Keßler A, Hickel R, Ilie N. In vitro investigation of the influence of printing direction on the flexural strength, flexural modulus and fractographic analysis of 3D-printed temporary materials. Dent Mater J 2021; 40 (03) 641-649
    CrossrefPubMedSearch in Google Scholar
  • 25 Shim JS, Kim JE, Jeong SH, Choi YJ, Ryu JJ. Printing accuracy, mechanical properties, surface characteristics, and microbial adhesion of 3D-printed resins with various printing orientations. J Prosthet Dent 2020; 124 (04) 468-475
    CrossrefPubMedSearch in Google Scholar
  • 26 Li P, Lambart AL, Stawarczyk B, Reymus M, Spintzyk S. Postpolymerization of a 3D-printed denture base polymer: impact of post-curing methods on surface characteristics, flexural strength, and cytotoxicity. J Dent 2021; 115: 103856
    CrossrefPubMedSearch in Google Scholar
  • 27 Schubert A, Wassmann T, Holtappels M, Kurbad O, Krohn S, Bürgers R. Predictability of microbial adhesion to dental materials by roughness parameters. Coatings 2019; 9 (07) 456
    CrossrefSearch in Google Scholar
  • 28 Srinivasan M, Chien EC, Kalberer N. et al. Analysis of the residual monomer content in milled and 3D-printed removable CAD-CAM complete dentures: an in vitro study. J Dent 2022; 120: 104094
    CrossrefPubMedSearch in Google Scholar
  • 29 Jang W, Kook G-S, Kang J-H. et al. Effect of washing condition on the fracture strength, and the degree of conversion of 3D printing resin. Appl Sci (Basel) 2021; 11 (24) 11676
    CrossrefSearch in Google Scholar
  • 30 Charasseangpaisarn T, Wiwatwarrapan C, Leklerssiriwong N. Ultrasonic cleaning reduces the residual monomer in acrylic resins. J Dent Sci 2016; 11 (04) 443-448
    CrossrefPubMedSearch in Google Scholar
  • 31 Vallittu PK, Ruyter IE, Buykuilmaz S. Effect of polymerization temperature and time on the residual monomer content of denture base polymers. Eur J Oral Sci 1998; 106 (01) 588-593
    CrossrefPubMedSearch in Google Scholar
  • 32 Ayaz EA, Durkan R, Koroglu A, Bagis B. Comparative effect of different polymerization techniques on residual monomer and hardness properties of PMMA-based denture resins. J Appl Biomater Funct Mater 2014; 12 (03) 228-233
    PubMedSearch in Google Scholar
  • 33 Freitas RFCP, Duarte S, Feitosa S. et al. Physical, mechanical, and anti-biofilm formation properties of CAD-CAM milled or 3D printed denture base resins: in vitro analysis. J Prosthodont 2023; 32 (S1): 38-44
    CrossrefPubMedSearch in Google Scholar
  • 34 Çakmak G, Donmez MB, Akay C, Abou-Ayash S, Schimmel M, Yilmaz B. Effect of thermal cycling on the flexural strength and hardness of New-generation denture base materials. J Prosthodont 2023; 32 (S1): 81-86
    CrossrefPubMedSearch in Google Scholar
  • 35 Alshamrani AA, Raju R, Ellakwa A. Effect of printing layer thickness and postprinting conditions on the flexural strength and hardness of a 3D-printed resin. BioMed Res Int 2022; 2022: 8353137
    CrossrefPubMedSearch in Google Scholar
  • 36 Guimaraes DM, Campaner M, Santos RWD, Pesqueira AA, Medeiros RA. Evaluation of the mechanical properties of different materials for manufacturing occlusal splints. Braz Oral Res 2023; 37: e034
    CrossrefPubMedSearch in Google Scholar
  • 37 Ferracane JL. Correlation between hardness and degree of conversion during the setting reaction of unfilled dental restorative resins. Dent Mater 1985; 1 (01) 11-14
    CrossrefPubMedSearch in Google Scholar