Accuracy of crowns based on digital intraoral scanning compared to conventional impression—a split-mouth randomised clinical study

2019 ◽  
Vol 23 (11) ◽  
pp. 4043-4050 ◽  
Author(s):  
Yasser Haddadi ◽  
Golnosh Bahrami ◽  
Flemming Isidor
Keyword(s):  
Clinical Study ◽  
Intraoral Scanning ◽  
Conventional Impression

scholarly journals Accuracy of digital models generated by conventional impression/plaster-model methods and intraoral scanning

2018 ◽  
Vol 37 (4) ◽  
pp. 628-633 ◽  
Author(s):  
Yuki TOMITA ◽  
Jun UECHI ◽  
Masahiro KONNO ◽  
Saera SASAMOTO ◽  
Masahiro IIJIMA ◽  
...  
Keyword(s):  
Digital Models ◽  
Intraoral Scanning ◽  
Plaster Model ◽  
Conventional Impression

scholarly journals Computerized Casts for Orthodontic Purpose Using Powder-Free Intraoral Scanners: Accuracy, Execution Time, and Patient Feedback

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Maria Francesca Sfondrini ◽  
Paola Gandini ◽  
Maurizio Malfatto ◽  
Francesco Di Corato ◽  
Federico Trovati ◽  
...  
Keyword(s):  
Computer Software ◽  
Digital Impression ◽  
Processing Times ◽  
Patient Feedback ◽  
Intraoral Scanning ◽  
Digital Impressions ◽  
Titanium Dioxide Powder ◽  
Dioxide Powder ◽  
Digital Scanning ◽  
Conventional Impression

Introduction. Intraoral scanners allow direct images of oral situation, with fewer steps than conventional impressions. The purpose of this study was to compare the accuracy of digital impressions, traditional impressions, and digitalization of full-arch gypsum models, to evaluate timing of different methods and finally to study perception of patients about conventional and digital impression techniques. Methods. Dental arches of fourteen patients were evaluated by alginate impression, titanium dioxide powder-free intraoral scanning (Trios, 3Shape), and digitalization obtained from gypsum models using the same scanner. Conventional and digital techniques were evaluated through measurements (lower and upper arch anteroposterior length, lower and upper intercanine distance, and lower and upper intermolar distance) with a caliber for analogic models and using a computer software for digital models (Ortho Analyzer, Great Lakes Orthodontics). In addition, chairside and processing times were recorded. Finally, each patient completed a VAS questionnaire to evaluate comfort. Statistical analyses were performed with ANOVA and Tukey tests for accuracy measurements and paired t-test for times and VAS scores. Significance was predetermined at P<0.05. Results. The measurements obtained with intraoral scanning, gypsum models after conventional impression, and digitalized gypsum models were not significantly different. Both chairside and processing times of digital scanning were shorter than the traditional method. VAS reporting patients comfort were significantly higher when evaluating digital impression. Conclusions. Intraoral scanners used for orthodontic applications provide useful data in clinical practice, comparable to conventional impression. This technology is more time efficient than traditional impression and comfortable for patients. Further evolution with more accurate and faster scanners could in future replace traditional impression methods.

scholarly journals Gingival Displacement in the Vertical and Horizontal Dimension under the Condition of Mild Gingivitis—A Randomized Clinical Study

2022 ◽  
Vol 11 (2) ◽  
pp. 437
Author(s):  
Katharina Kuhn ◽  
David Zügel ◽  
Victor-Sebastian A. Korbay ◽  
Thomas Papas ◽  
Sigmar Schnutenhaus ◽  
...  
Keyword(s):  
Clinical Study ◽  
Oral Care ◽  
Vertical Direction ◽  
Computer Assisted ◽  
Randomized Clinical Study ◽  
Tissue Changes ◽  
Similar Range ◽  
Soft Tissue Changes ◽  
Conventional Impression

This randomized clinical study aimed at quantifying the gingival displacement performance in the vertical and horizontal directions of the 3M™ Astringent Retraction Paste (3M Oral Care, Seefeld, Germany) in comparison with the double-cord technique with aluminum chloride as an astringent. Afterward, any soft-tissue changes were assessed for 12 months. After inducing mild gingivitis, 18 probands received the intervention ‘cord’ and 22 probands received the intervention ‘paste’ at the palatal half of upper premolars prior to conventional impression making. The resulting plaster casts were digitized and analyzed for the vertical and horizontal gingival displacement, applying a newly developed computer-assisted methodology. The entire palatal half of the tooth was evaluated instead of only single sites. Under the condition of mild gingivitis, the gingival displacement performance was comparable for both techniques in the horizontal direction (width) and only somewhat better for the cord technique in the vertical direction (depth). The magnitude of displacement was in a similar range in both directions, with somewhat higher values in the vertical direction. The marginal gingiva height changes were of such low extent during the follow-up period of 12 months with only minimally higher values for the paste that they cannot be considered as clinically relevant recessions.

Patient-related outcomes of conventional impression making versus intraoral scanning for prosthetic rehabilitation: A systematic review and meta-analysis

2021 ◽  
Author(s):  
Thalita de Paris Matos ◽  
Letícia Maíra Wambier ◽  
Michael Willian Favoreto ◽  
Carlos Eduardo Edwards Rezende ◽  
Alessandra Reis ◽  
...  
Keyword(s):  
Systematic Review ◽  
Meta Analysis ◽  
Prosthetic Rehabilitation ◽  
Intraoral Scanning ◽  
Conventional Impression

scholarly journals Influence of the Gingival Condition on the Performance of Different Gingival Displacement Methods—A Randomized Clinical Study

2021 ◽  
Vol 10 (13) ◽  
pp. 2747
Author(s):  
Katharina Kuhn ◽  
Heike Rudolph ◽  
David Zügel ◽  
Benjamin A. Just ◽  
Michael Hrusa ◽  
...  
Keyword(s):  
Clinical Study ◽  
Three Dimensional ◽  
Gingival Recession ◽  
Randomized Clinical Study ◽  
Opposite Quadrant ◽  
Superior Sulcus ◽  
And Control ◽  
Plaster Models ◽  
Conventional Impression ◽  
Minor Extent

This randomized clinical study examined the influence of the gingival condition—healthy versus mild inflammation—on sulcus representation and possible gingival recession for two gingival displacement procedures prior to conventional impression making. The interventions double cord technique or a kaolin paste containing aluminum chloride were applied to 40 probands. The opposite quadrant served as intrapersonal reference (split-mouth design). Precision impressions were then made. Extraoral digitization of the plaster models resulting from the reference impression prior to gingival displacement, the intervention impression and control impressions were the basis for the computer-aided three-dimensional analysis. After six months, a mild artificial gingivitis was induced, and the contralateral quadrant (cross-over design) was examined for the intervention. The gingivitis deteriorated the sulcus representation for the double cord technique group but did not affect the paste technique group. The gingival condition had no influence on the marginal gingiva height changes. The minor extent of those changes, which were measured up to six months after intervention at the palatal study site, were not considered to be in the clinically relevant range for gingival recession. For healthy gingiva, the cord technique showed superior sulcus representation compared to the paste technique. This advantage was lost to a great extent under the conditions of mild gingivitis.

scholarly journals Multivariate Assessment of Marginal Fit of Three Types of Dental Crowns Using Three Scanning Systems for CAD-CAM Technology - in vitro Pilot Study

2018 ◽  
Vol 55 (3) ◽  
pp. 376-379
Author(s):  
Smaranda Buduru ◽  
Anca Mesaros ◽  
Cristian Culcitchi ◽  
Marioara Moldovan ◽  
Doina Prodan ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Marginal Fit ◽  
Dental Crowns ◽  
Intraoral Scanning ◽  
Different Types ◽  
Cad Cam ◽  
Scanning Systems ◽  
Conventional Impression ◽  
Hybrid Ceramic

The objective of this in-vitro study was to compare if there are any differences in the marginal fit of crowns fabricated by CAD/CAM technique. We used three different types of materials (two types of polymethylmetacrylate (PMMA) provided by two different manufacturers and one type of hybrid ceramic) and three different types of impressions: intraoral scanning, model scanning and conventional impression scanning. The crowns were subsequently measured with an electronic microscope at 1000X. Our results showed better results for the hybrid ceramic. The differences between the PMMA were not significant. There were no statistic differences with the ANOVA analysis between the scanning methods. Best combination in terms of marginal fit was found with hybrid ceramic and intraoral scanning.

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