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Digital scan of different intraoral scanners accurate for long-span fixed prosthesis: Study
A research published in the Journal of Prosthetic Dentistry has revealed that the digital scan of different intraoral scanners (IOSs) for long-span fixed prosthesis was found accurate.
Burcu Diker and colleagues from the Department of Prosthetic Dentistry, Faculty of Dentistry, University of Istanbul Okan, Istanbul, Turkey conducted the present study to evaluate the accuracy of 6 IOSs for complete-arch and prepared teeth digitally isolated from the complete-arch and to determine the effect of the starting quadrant on accuracy.
The digital scan accuracy of different intraoral scanners (IOSs) for long-span fixed prosthesis and the effect of the starting quadrant on accuracy is unclear.
Hence, the authors used a maxillary model containing bilaterally prepared canines, first molar teeth, and edentulous spans between the prepared teeth. The model was scanned by using a highly accurate industrial scanner to create a digital reference data set. Six IOSs were evaluated: TRIOS, iTero, Planmeca Emerald, Cerec Omnicam, Primescan, and Virtuo Vivo. The model was scanned 10 times with each IOS by 1 operator according to the protocols described by the manufacturers.
Five scans were made starting from the right quadrant (ScanR), followed by 5 scans starting from the left quadrant (ScanL). All data sets were obtained in standard tessellation language (STL) file format and were used to evaluate accuracy (trueness and precision) with a 3D analyzing software program (Geomagic Studio 12; 3D Systems) by using a best-fit alignment. The prepared teeth were digitally isolated from the complete-arch and evaluated with the analyzing software program. The Kruskal-Wallis and Mann-Whitney U statistical tests were used to detect differences for trueness and precision (α=.05).
The following results were seen-
- Statistically significant differences were found regarding IOSs (P<.003) and scanning sequence (P<.05).
- The TRIOS showed the best trueness for the complete-arch, but not statistically different from Primescan, Virtuo Vivo, and iTero (P>.003).
- The lowest median values for precision of the complete-arch were also found using TRIOS, but no significant difference was found among the scanners (P>.003).
- In terms of trueness and precision, Primescan had the best accuracy for preparations.
- Emerald showed significant differences depending on the scanning sequence for complete-arch accuracy.
- ScanR for trueness (P=.021) and ScanL for precision (P=.004) showed improved results.
- However, Emerald, TRIOS, and Virtuo Vivo showed statistically significant differences in precision of preparations depending on scanning sequence.
- ScanL deviated less than ScanR when scanned with TRIOS (P=.025) and Emerald (P=.004), and the opposite with Virtuo Vivo (P=.008).
- In terms of preparations trueness, no significant difference was found between the ScanR and ScanL of any IOS (P>.05).
Therefore, the authors concluded that "based on this in vitro study, the accuracy of the complete-arch and prepared teeth differed according to the IOS and scanning sequence."
BDS, MDS( Pedodontics and Preventive Dentistry)
Dr. Nandita Mohan is a practicing pediatric dentist with more than 5 years of clinical work experience. Along with this, she is equally interested in keeping herself up to date about the latest developments in the field of medicine and dentistry which is the driving force for her to be in association with Medical Dialogues. She also has her name attached with many publications; both national and international. She has pursued her BDS from Rajiv Gandhi University of Health Sciences, Bangalore and later went to enter her dream specialty (MDS) in the Department of Pedodontics and Preventive Dentistry from Pt. B.D. Sharma University of Health Sciences. Through all the years of experience, her core interest in learning something new has never stopped. She can be contacted at editorial@medicaldialogues.in. Contact no. 011-43720751
Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751