PMID- 32207461
OWN - NLM
STAT- MEDLINE
DCOM- 20200325
LR  - 20211204
IS  - 1463-4201 (Print)
IS  - 1463-4201 (Linking)
VI  - 23
IP  - 1
DP  - 2020
TI  - Evaluation of model materials for CAD/CAM in vitro studies.
PG  - 49-56
AB  - AIM: Evaluation of appropriate models for computer-aided design/computer-aided 
      manufacturing (CAD/CAM) in vitro studies by investigation of different model 
      materials regarding suitability for intraoral scanners and dimensional stability. 
      MATERIALS AND METHODS: A typodont model was prepared to accommodate a 10-unit 
      prosthesis. The model was duplicated using six different materials: class IV die 
      stone (DS), cobalt-chrome molybdenum (CoCrMo), epoxy resin (EPOX), polyurethane 
      (PU), titanium (TI), and zirconia (ZI). An intraoral scanner was used to obtain 
      three scans of each model. Reference datasets were generated using micro-computed 
      tomography (micro-CT). The first scan was compared with the corresponding 
      reference micro-CT dataset to assess its trueness. The precision was measured by 
      comparing all scans within one test group. For the evaluation of dimensional 
      stability, micro-CT was used to generate three-dimensional (3D) datasets of the 
      models at different time intervals over a 6-week period. The models were kept 
      under constant conditions during the study. All datasets were analyzed with 
      software that determined the deviation of two datasets by alignment using a 
      best-fit algorithm. RESULTS: The criterion of trueness was fulfilled by CoCrMo, 
      EPOX, PU, and the typodont model. Scans of CoCrMo and ZI showed the best 
      precision. PU and the typodont model did not meet the requirement of dimensional 
      stability, whereas EPOX and gypsum were stable only for a period of 10 days. 
      CONCLUSION: The CoCrMo model was the only one that met all the criteria for an 
      appropriate model for CAD/CAM in vitro studies. The other investigated materials 
      either lacked dimensional stability or could not be scanned accurately and 
      reproducibly.
FAU - Hamm, Jennifer
AU  - Hamm J
FAU - Berndt, Ernst-Ulrich
AU  - Berndt EU
FAU - Beuer, Florian
AU  - Beuer F
FAU - Zachriat, Christine
AU  - Zachriat C
LA  - eng
PT  - Journal Article
PL  - England
TA  - Int J Comput Dent
JT  - International journal of computerized dentistry
JID - 100891504
RN  - 0 (Chromium Alloys)
RN  - D1JT611TNE (Titanium)
MH  - Chromium Alloys
MH  - *Computer-Aided Design
MH  - Dental Impression Technique
MH  - *Dental Marginal Adaptation
MH  - Humans
MH  - Imaging, Three-Dimensional
MH  - Models, Dental
MH  - Titanium
MH  - X-Ray Microtomography
OTO - NOTNLM
OT  - accuracy
OT  - digital impression
OT  - in vitro
OT  - intraoral scanner
OT  - model materials
OT  - CAD/CAM
EDAT- 2020/03/25 06:00
MHDA- 2020/03/26 06:00
CRDT- 2020/03/25 06:00
PHST- 2020/03/25 06:00 [entrez]
PHST- 2020/03/25 06:00 [pubmed]
PHST- 2020/03/26 06:00 [medline]
AID - 833724 [pii]
PST - ppublish
SO  - Int J Comput Dent. 2020;23(1):49-56.