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Article: A simple solution to recycle and reuse dental CAD/CAM zirconia block from its waste residuals

TitleA simple solution to recycle and reuse dental CAD/CAM zirconia block from its waste residuals
Authors
KeywordsZirconia
Dental materials
Recycle
Waste
CAD/CAM
Issue Date2021
PublisherElsevier Japan KK. The Journal's web site is located at http://www.journalofprosthodonticresearch.com/
Citation
Journal of Prosthodontic Research, 2021, v. 65, p. article no. JPR_D_20_00002 How to Cite?
AbstractPurpose: To seek a simple solution that can recycle and regenerate dental CAD/CAM zirconia green blanks from its waste residuals. Methods: Waste residuals (3M® Lava™ Plus HT) were pulverized after dry milling and cutting, and subsequently sieved before pickling in a 0.5 M nitric acid. These powders were then dry-pressed and pre-sintered into blocks at seven different temperatures in the range 800−1100 °C. New zirconia blocks flagged with the same batch numbers were used as control. These blocks were cut into bars before subjected them to manufacturer-recommended sintering at 1450 °C. Crystalline phases (by XRD), elemental compositions (by EDX), surface morphologies (by SEM), machinability, linear shrinkage rate, relative density, and Knoop microhardness were evaluated before and after sintering, and four-point flexural strengths were also evaluated for the sintered zirconia bars. Results: Only tetragonal phases were found in both pre- and fully-sintered recycled zirconia blocks. SEM results showed that pre-sintered samples at 950 °C had smooth and flat surfaces with evenly distributed particles. Recycled and control zirconia blocks had similar elemental compositions. Results from machined surface, linear shrinkage rate, relative density, and Knoop microhardness established that 950 °C and 1000 °C were suitable pre-sintering temperatures for recycling zirconia. Pre-sintered recycled zirconia had no significant differences in flexural strengths, however, samples pre-sintered at 1000 °C exhibited the closest value (897 MPa) compared to that of the control (904 MPa). Conclusions: Dental CAD/CAM zirconia can be recycled and reused from its waste residuals by adopting a simple method that requires a pre-sintering at 950 or 1000 °C.
DescriptionHybrid open access
Persistent Identifierhttp://hdl.handle.net/10722/296357
ISSN
2023 Impact Factor: 3.2
2023 SCImago Journal Rankings: 1.135
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorDING, H-
dc.contributor.authorTsoi, JKH-
dc.contributor.authorKan, CW-
dc.contributor.authorMatinlinna, JP-
dc.date.accessioned2021-02-22T04:54:09Z-
dc.date.available2021-02-22T04:54:09Z-
dc.date.issued2021-
dc.identifier.citationJournal of Prosthodontic Research, 2021, v. 65, p. article no. JPR_D_20_00002-
dc.identifier.issn1883-1958-
dc.identifier.urihttp://hdl.handle.net/10722/296357-
dc.descriptionHybrid open access-
dc.description.abstractPurpose: To seek a simple solution that can recycle and regenerate dental CAD/CAM zirconia green blanks from its waste residuals. Methods: Waste residuals (3M® Lava™ Plus HT) were pulverized after dry milling and cutting, and subsequently sieved before pickling in a 0.5 M nitric acid. These powders were then dry-pressed and pre-sintered into blocks at seven different temperatures in the range 800−1100 °C. New zirconia blocks flagged with the same batch numbers were used as control. These blocks were cut into bars before subjected them to manufacturer-recommended sintering at 1450 °C. Crystalline phases (by XRD), elemental compositions (by EDX), surface morphologies (by SEM), machinability, linear shrinkage rate, relative density, and Knoop microhardness were evaluated before and after sintering, and four-point flexural strengths were also evaluated for the sintered zirconia bars. Results: Only tetragonal phases were found in both pre- and fully-sintered recycled zirconia blocks. SEM results showed that pre-sintered samples at 950 °C had smooth and flat surfaces with evenly distributed particles. Recycled and control zirconia blocks had similar elemental compositions. Results from machined surface, linear shrinkage rate, relative density, and Knoop microhardness established that 950 °C and 1000 °C were suitable pre-sintering temperatures for recycling zirconia. Pre-sintered recycled zirconia had no significant differences in flexural strengths, however, samples pre-sintered at 1000 °C exhibited the closest value (897 MPa) compared to that of the control (904 MPa). Conclusions: Dental CAD/CAM zirconia can be recycled and reused from its waste residuals by adopting a simple method that requires a pre-sintering at 950 or 1000 °C.-
dc.languageeng-
dc.publisherElsevier Japan KK. The Journal's web site is located at http://www.journalofprosthodonticresearch.com/-
dc.relation.ispartofJournal of Prosthodontic Research-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectZirconia-
dc.subjectDental materials-
dc.subjectRecycle-
dc.subjectWaste-
dc.subjectCAD/CAM-
dc.titleA simple solution to recycle and reuse dental CAD/CAM zirconia block from its waste residuals-
dc.typeArticle-
dc.identifier.emailTsoi, JKH: jkhtsoi@hku.hk-
dc.identifier.emailMatinlinna, JP: jpmat@hku.hk-
dc.identifier.authorityTsoi, JKH=rp01609-
dc.identifier.authorityMatinlinna, JP=rp00052-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.2186/jpr.JPR_D_20_00002-
dc.identifier.pmid33028797-
dc.identifier.scopuseid_2-s2.0-85106633322-
dc.identifier.hkuros321319-
dc.identifier.volume65-
dc.identifier.spagearticle no. JPR_D_20_00002-
dc.identifier.epagearticle no. JPR_D_20_00002-
dc.identifier.isiWOS:000692322500008-
dc.publisher.placeJapan-

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