PMID- 37615777
OWN - NLM
STAT- Publisher
LR  - 20231010
IS  - 1436-3771 (Electronic)
IS  - 1432-6981 (Print)
IS  - 1432-6981 (Linking)
VI  - 27
IP  - 10
DP  - 2023 Oct
TI  - The effect of cyclic loading on the fracture resistance of 3D-printed and CAD/CAM 
      milled zirconia crowns-an in vitro study.
PG  - 6125-6133
LID - 10.1007/s00784-023-05229-2 [doi]
AB  - OBJECTIVES: The aim of this study was to evaluate the effect of cyclic mechanical 
      loading on the fracture resistance of 3D-printed zirconia crowns in comparison to 
      milled zirconia crowns. MATERIALS AND METHODS: Monolithic zirconia crowns 
      (n = 30) were manufactured using subtractive milling (group M) and 3D additive 
      printing (group P). Nine samples of each group were fractured under one-time 
      loading while the other 6 samples were subjected to cyclic loading for 1.2 
      million cycles before being subjected to one-time loading until fracture. 
      Scanning electron microscope (SEM) fractographic analysis was carried out on 
      fractured fragments of representative samples. RESULTS: The mean for fracture 
      resistance of group M was 1890 N without cyclic loading and 1642 N after being 
      subjected to cyclic loading, and they were significantly higher than that of 
      group P (1658 N and 1224 N respectively). CONCLUSIONS: The fabrication technique 
      and cyclic loading affect the fracture resistance of zirconia crowns. Although 
      the fracture resistance values for the 3D-printed crowns were lower than those of 
      the milled, still they are higher than the masticatory forces and thus could be 
      considered being clinically acceptable. CLINICAL RELEVANCE: Concerning fracture 
      resistance, 3D-printed crowns can withstand the masticatory forces for the long 
      term without any cracks or failure.
CI  - (c) 2023. The Author(s).
FAU - Refaie, Ashraf
AU  - Refaie A
AUID- ORCID: 0000-0002-6799-9133
AD  - Oral Technology, Dental School, Medical Faculty, University Hospital of Bonn, 
      Welschnonnenstr. 17, 53111, Bonn, North Rhine-Westphalia, Germany. 
      ashrafrefaie87@gmail.com.
AD  - Department of Fixed Prosthodontics, Faculty of Dentistry, Fayoum University, 
      Faiyum, Egypt. ashrafrefaie87@gmail.com.
FAU - Bourauel, Christoph
AU  - Bourauel C
AUID- ORCID: 0000-0002-2195-1011
AD  - Oral Technology, Dental School, Medical Faculty, University Hospital of Bonn, 
      Welschnonnenstr. 17, 53111, Bonn, North Rhine-Westphalia, Germany.
FAU - Fouda, Ahmed Mahmoud
AU  - Fouda AM
AUID- ORCID: 0000-0002-5139-0956
AD  - Oral Technology, Dental School, Medical Faculty, University Hospital of Bonn, 
      Welschnonnenstr. 17, 53111, Bonn, North Rhine-Westphalia, Germany.
AD  - Suez Canal University, Ismailia, Egypt.
FAU - Keilig, Ludger
AU  - Keilig L
AD  - Oral Technology, Dental School, Medical Faculty, University Hospital of Bonn, 
      Welschnonnenstr. 17, 53111, Bonn, North Rhine-Westphalia, Germany.
AD  - Department of Prosthodontics, Preclinical Education and Dental Materials Science, 
      Dental School, Medical Faculty, University Hospital of Bonn, 53111, Bonn, North 
      Rhine-Westphalia, Germany.
FAU - Singer, Lamia
AU  - Singer L
AUID- ORCID: 0000-0002-2282-2481
AD  - Oral Technology, Dental School, Medical Faculty, University Hospital of Bonn, 
      Welschnonnenstr. 17, 53111, Bonn, North Rhine-Westphalia, Germany.
AD  - Department of Orthodontic, Dental School, Medical Faculty, University Hospital of 
      Bonn, 53111, Bonn, North Rhine-Westphalia, Germany.
LA  - eng
PT  - Journal Article
DEP - 20230824
PL  - Germany
TA  - Clin Oral Investig
JT  - Clinical oral investigations
JID - 9707115
PMC - PMC10560138
OTO - NOTNLM
OT  - 3D printing
OT  - Cyclic loading
OT  - Fracture resistance
OT  - Zirconia
COIS- The authors declare no competing interests.
EDAT- 2023/08/24 13:43
MHDA- 2023/08/24 13:43
PMCR- 2023/08/24
CRDT- 2023/08/24 11:09
PHST- 2023/05/15 00:00 [received]
PHST- 2023/08/17 00:00 [accepted]
PHST- 2023/08/24 13:43 [pubmed]
PHST- 2023/08/24 13:43 [medline]
PHST- 2023/08/24 11:09 [entrez]
PHST- 2023/08/24 00:00 [pmc-release]
AID - 10.1007/s00784-023-05229-2 [pii]
AID - 5229 [pii]
AID - 10.1007/s00784-023-05229-2 [doi]
PST - ppublish
SO  - Clin Oral Investig. 2023 Oct;27(10):6125-6133. doi: 10.1007/s00784-023-05229-2. 
      Epub 2023 Aug 24.