Qualitative and semi-quantitative assessment of processing-related surface contamination of one- and two-piece CAD/CAM abutments before and after ultrasonic cleaning

  • Manufacturing processes of custom implant abutments may contaminate their surfaces with micro wear deposits and generic pollutants. Such particulate debris, if not removed, might be detrimental and provoke inflammatory reactions in peri-implant tissues. Although regulatory guidelines for adequate cleaning, disinfection, or sterilization exist, there does not appear to be a consistent application and data on the amount and extent of such contaminants is lacking. The aim of the present in vitro study was to evaluate the quality and quantity of processing-related surface contamination of computer-aided design/computer-aided manufacturing (CAD/CAM) abutments in the state of delivery and after ultrasonic cleaning. A total of 28 CAD/CAM monotype and hybrid abutments were cleaned and disinfected applying a three-stage ultrasonic protocol (Finevo protocol). Before and after cleaning, the chemical composition and the contamination of the abutments were assessed using scanning electron microscopy (SEM), dispersive X-ray spectroscopy(EDX),andcomputer-aidedplanimetricmeasurement(CAPM).Inthedeliverycondition, monotype abutments showed a significantly higher amount of debris compared to hybrid abutments (4.86±6.10% vs. 0.03 ± 0.03%, p < 0.001). The polishing process applied in the laboratory after bonding the hybrid abutment components reduces the surface roughness and thus contributes substantially to their purity. The extent of contamination caused by computer-aided manufacturing of custom abutments can be substantially minimized using a three-stage ultrasonic protocol.
Author:Peter GehrkeORCiDGND, Cyrus Abazari, Kai Schlichter, Carsten FischerORCiD, Dirk Duddeck, Georgios RomanosORCiDGND, Paul WeiglORCiD
Parent Title (English):Materials
Place of publication:Basel
Document Type:Article
Date of Publication (online):2020/07/20
Date of first Publication:2020/07/20
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2020/08/25
Tag:CAD/CAM; Finevo; contamination; debris; hybrid abutment; monotype abutment; planimetric measurement; ultrasonic cleaning
Issue:art. 3225
Page Number:18
First Page:1
Last Page:18
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Licence (English):License LogoCreative Commons - Namensnennung-Nicht kommerziell 4.0