The influence of the post-processing method on knoop hardness of photosensitive resins for 3D SLA printer used in Dentistry
DOI:
https://doi.org/10.11606/issn.2357-8041.clrd.2019.161294Keywords:
Digital dentistry, Polymers, Hardness Knoop, CAD/CAM, Dental Resin, Additive ManufacturingAbstract
Objectives: The aim of this study is to compare the mechanical characteristics of resins for 3D printers with the acrylic resins that have been used in Dentistry, according to the post-processing method. Materials and Methods: Using an SLA 3D printer (Form 2 – Formlabs, Massachusetts, USA), samples (discs) were produced with the printer’s resins, Dental SG®, Dental LT®, Clear®, and Grey®. Samples made of thermopolimerized and auto polymerized acrylic resins were produced as well (Gold Standart parameters). The Knoop Hardness (KH) tests were performed using microdurometer HMV-2 (Shimadzu, Kyoto, Japan). Results: The results showed the Dental SG resin presented the highest KH, compared with thermopolimerized acrylic resin, the Clear and Dental LT resins KH were compared with auto polymerized acrylic resin, and the non-post cured Grey resin (not for intraoral use), as well as the Dental LT resin, showed the lowest KH. Conclusions: Considering the hardness, the printer’s resins are comparable with the acrylic resins established, when the post-processing method is thoroughly followed. The absence of material’s post-processing reduce significantly the material’s hardness. Clinical relevance: Regarding the use of 3D printing in Dentistry, the development of materials adequate for the equipment, biocompatible for intraoral uses, and compatible mechanical proprieties are essential.
Downloads
References
Revilla-León M, Ozcan M. Additive Manufacturing technologies used for processing polymers: current status and potential application in Prosthetic Dentistry. J Prosthodont. 2018;28(2):1-13. doi: 10.1111/jopr.12801.
Schweiger J, Stumbaum J, Edelhoff D, Guth JF. Systematics and concepts for the digital production of complete dentures: risks and opportunities. Int J Comput Dent. 2018;21(1):41-56.
Bhargav A, Sanjairaj C, Rosa V, Feng LW, Fuh YhJ. Applications of additive manufacturing in dentistry: a review. J Biomed Mater Res B Appl Biomater. 2018;106(5):2058-2064. doi: 10.1002/jbm.b.33961.
Kawala M, Smardz J, Adamczyk L, Grychowska N, Wieckiewicz M. Selected applications for current polymers in prosthetic dentistry – state of the art. Curr Med Chem. 2018;25:1-11.
Saisadan D, Manimaran P, Meenapriva PK. In vitro comparative evaluation of the mechanical properties of temporary restorative materials used in fixed partial denture. J Pharm Bioallied Sci. 2016;8(suppl 1):S105-S109. doi: 10.4103/0975-7406.191936.
Sivakumar I, Arunachalam KS, Saijan S, Ramaraju AV, Rao B, Kamaraj B. Incorporation of antimicrobial macromolecules in acrylic denture base resin: a research composition and update. J Prostodont. 2014;23(4):284-90. doi: 10.1111/jopr12105.
Formlabs [Internet]. Clear safety data sheet [cited 2019 Oct 25]. Available from: https://bit.ly/32O0AGp
Formlabs [Internet]. Dental LT clear safety data sheet [cited 2019 Oct 25]. Available from: https://bit.ly/2BFN8Zg
Formlabs [Internet]. Dental SG safety data sheet [cited 2019 Oct 25]. Available from: https://bit.ly/2JncTBD
Knoop F, Peters CG, Emerson WB. A sensitive pyramidal-diamond tool for indentation measurements. Research Paper RP1220. National Bureau of Standards, U.S. Dept. Commerce. 1939:211-40.
Goiato MC, Santos DM, Andreotti AM, Nobrega AS, Moreno A, Haddad MF, et al. Effect of Beverages and Mouthwashes on the Hardness of Polymers Used in Intraoral Prostheses. J of Prosthod. 2014;23:559-64.
Fernandes AU, Goiato MC, Santos DM. Effect of weathering and thickness on the superficial microhardness of acrylic resin and ocular button. Cont Lens Anterior Eye. 2009;32:283-87.
Kurzmann C, Janjić K, Shokoohi-Tabrizi H, Edelmayer M, Pensch M, Moritz A, et al. Evaluation of resins for stereolithographic 3D-printed surgical guides: the response of L929 cells and human gingival fibroblasts. Biomed Res Int. 2017;4057612.
Formlabs [Internet]. A guide to post-curing Formlabs resins [cited 20198 Oct 25]. Available from: https://bit.ly/32NnXjt
Washing settings [Internet]. Form wash time settings [cited 2019 Oct 25]. Available from: https://bit.ly/365PcYu
Voet VSD, Strating T, Schnelting GHM, Dijkstra P, Tietema M, Xu J, et al. Biobased acrylate photocurable resin formulation for stereolithography 3D printing. ACS Omega. 2018;3(2):1403-8.
Downloads
Published
Issue
Section
License
Authors are requested to send, together with the letter to the Editors, a term of responsibility. Thus, the works submitted for appreciation for publication must be accompanied by a document containing the signature of each of the authors, the model of which is presented as follows:
I/We, _________________________, author(s) of the work entitled_______________, now submitted for the appreciation of Clinical and Laboratorial Research in Dentistry, agree that the authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
Date: ____/____/____Signature(s): _______________
