Retention Forces of Prosthetic Clasps over a Simulated Wearing Period of Six Years In-Vitro: Direct Metal Laser Melting Versus Dental Casting

This study determinates the persistence of retention force in Akers-clasps for removable partial dentures made from Co-Cr alloy. Therefore, standardized computer-aided designed (CAD) clasp #1 specimens were made by direct metal laser melting (DMLM, n = 10) and by lost-wax dental casting (DC) of comp...

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Bibliographic Details
Published in:Materials 2020-11, Vol.13 (23), p.5339
Main Authors: Mutschler, Moritz, Schweitzer, Florian, Spintzyk, Sebastian, Geis-Gerstorfer, Jürgen, Huettig, Fabian
Format: Article
Language:English
Subjects:
Alloys
CAD
CAM
Cobalt base alloys
Communication
Computer aided design
Computer aided manufacturing
Dental alloys
Dental materials
Dentures
Design
Digitization
Fasteners
Investment casting
Laser beam melting
Lasers
Manufacturing
Prostheses
Software
Zirconium dioxide
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Summary:This study determinates the persistence of retention force in Akers-clasps for removable partial dentures made from Co-Cr alloy. Therefore, standardized computer-aided designed (CAD) clasp #1 specimens were made by direct metal laser melting (DMLM, n = 10) and by lost-wax dental casting (DC) of computer-aided manufactured (CAM) replicas (n = 10, DC) from two comparable Co-Cr alloys. The retention force was tested after manufacturing for 9000 cycles of setting and removal from a molar tooth crown analog made from zirconia; simulating in-vitro a duration of six years in service. The first and last 360 cycles (T0 and T1, 3 months each) of all specimens were selected for comparison of retention forces between the materials. A constant decrease of 6% from the initial retention force (T0 = 4.86 N, SD = 0.077; T1 = 4.57 N, SD = 0.037) was detected at the DC specimens, and an increase of 4% in DMLM specimens (T0 = 5.69 N, SD = 0.078; T1 = 5.92 N, SD = 0.077); all differences were statistically significant ( < 0.0001). Even if these deviations are not of clinical relevance, further studies and applications should investigate the fatigue behavior of laser melted Co-Cr-alloys for dental application.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13235339