Subaşı, Meryem Gülce; Çakmak, Gülce; Sert, Murat; Yilmaz, Burak (2022). Effect of multiple firings on surface roughness and flexural strength of CAD-CAM ceramics. The journal of prosthetic dentistry, 128(2), 216.e1-216.e8. Elsevier 10.1016/j.prosdent.2022.05.021
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STATEMENT OF PROBLEM
Knowledge on the effect of multiple firings on surface roughness and the flexural strength of different types of monolithic computer-aided design and computer-aided manufacturing (CAD-CAM) ceramics is limited.
PURPOSE
The purpose of this in vitro study was to evaluate the effect of multiple firings on the surface roughness and flexural strength of 4 different CAD-CAM ceramics after thermocycling.
MATERIAL AND METHODS
Four different CAD-CAM ceramics (Lava All Zirconia 3-mol yttria tetragonal zirconia polycrystal [3-YTZP] [Z], VITA SUPRINITY [S], IPS e.max CAD [EX], IPS Empress CAD [E]) (n=33) were wet-sectioned to form rectangular 18×4×1.2-mm specimens. After glaze application, the specimens were divided into 3 subgroups according to the number of firings (1, 2, and 4) (n=11). The specimens were thermocycled (10 000 cycles), and surface roughness and flexural strength values were measured (n=10). One additional specimen from each group was analyzed by using scanning electron microscopy (SEM). Data were analyzed by 2-way analysis of variance (ANOVA) and the Tukey honestly significance difference (HSD) test (α=.05).
RESULTS
According to the 2-way ANOVA, the material, number of firings, and the interaction between the material and number of firings affected the surface roughness (P<.001). For flexural strength, material (P<.001) and number of firings (P<.039) were found significant. Multiple firings (2 or 4 firings) affected the surface roughness of E (P<.001). Regardless of the number of firings, the Z material had the highest flexural strength (P<.001). Four firings affected the flexural strength values only for the Z material (P≤.005).
CONCLUSIONS
CAD-CAM ceramic type affected the surface roughness and flexural strength values. The surface roughness of E was lower when fired 2 or 4 times than when fired once. The flexural strength of Z was lower when fired 4 times than when fired once.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology 04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry |
UniBE Contributor: |
Cakmak, Gülce, Yilmaz, Burak |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
1097-6841 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
07 Jul 2022 07:30 |
Last Modified: |
05 Dec 2022 16:21 |
Publisher DOI: |
10.1016/j.prosdent.2022.05.021 |
PubMed ID: |
35788273 |
BORIS DOI: |
10.48350/171115 |
URI: |
https://boris.unibe.ch/id/eprint/171115 |
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