Digital impressions in dentistry —accuracy of impression digitalisation by desktop scanners

Clinical Oral Investigationsvolume 24, pages1249–1257(2020)AbstractObjectivesTo test if the partially digital workflow by digitalisation of the impression reveals a comparable accuracy as the indirect digitalisation of the gypsum cast for 4-unit fixed dental prostheses (FDPs).Materials and methodsA titanium model with a tapered full veneer preparation of a molar and premolar was used as analysis model. To receive a virtual three-dimensional reference dataset (REF), it was digitised by industrial computed tomography. Three impression materials were used with individual impression trays (N = 36,n/material  = 12): (1) PE (Impregum Penta), (2) PVS-I (Imprint 4 Penta: Super Quick Heavy plus Super Quick Light), and (3) PVS-D (Dimension Penta: H Quick plus L). For partially digital workflow (group IMP), two desktop scanners were used: (1) D810 (3Shape D810) and (2) ZZ (Zirkonzahn S600ARTI). For i ndirect digitalisation (group CAST), gypsum master casts were manufactured and digitalised using the same desktop scanners. Virtual datasets were superimposed by best fit algorithm, and accuracy was analysed by calculating the Euclidean distances (ED) to the REF (Geomagic Qualify). Statistic was determined (Kruskal-WallisH test, Mann-WhitneyU post hoc analysis, two-sample Kolmogorov-Smirnov test,p 
Source: Dental Technology Blog - Category: Dentistry Source Type: news

Related Links:

ConclusionThis study identified the most accurate and reliable machine learning methods, which could enhance the application of radiomics methods in the precision of diagnosis of NPC.
Source: Molecular Imaging and Biology - Category: Molecular Biology Source Type: research
ConclusionsIntegrated [68Ga]PSMA-11 PET/MRI provides a similarly high diagnostic performance for localization of recurrent PC as PET/CT. For the detection of local recurrences [68Ga]PSMA-11 PET/MRI is superior compared with [68Ga]PSMA-11 PET/CT.
Source: Molecular Imaging and Biology - Category: Molecular Biology Source Type: research
Publication date: Available online 26 May 2020Source: European Journal of RadiologyAuthor(s): Pierre Berge, Astrid Darsonval, Cosmina Nedelcu, Anita Paisant, Christophe Aubé
Source: European Journal of Radiology - Category: Radiology Source Type: research
Publication date: June 2020Source: Journal of Hospital Infection, Volume 105, Issue 2Author(s): J.A. Al-Tawfiq, Z.A. Memish
Source: Journal of Hospital Infection - Category: Infectious Diseases Source Type: research
Nature Reviews Clinical Oncology, Published online: 26 May 2020; doi:10.1038/s41571-020-0393-zLung cancer screening is currently based only on low-dose CT scans; however, novel, more accessible methods that might improve uptake and adherence are eagerly awaited. New liquid biopsy approaches promise to revolutionize cancer screening. Herein, we discuss the opportunities and challenges associated with two such novel assays.
Source: Nature Reviews Clinical Oncology - Category: Cancer & Oncology Authors: Source Type: research
AbstractThe transvalvular pressure gradient (TPG) is commonly estimated using the Bernoulli equation. However, the method is known to be inaccurate. Therefore, an adjusted Bernoulli model for accurate TPG assessment was developed and evaluated. Numerical simulations were used to calculate TPGCFD in patient-specific geometries of aortic stenosis as ground truth. Geometries, aortic valve areas (AVA), and flow rates were derived from computed tomography scans. Simulations were divided in a training data set (135 cases) and a test data set (36 cases). The training data was used to fit an adjusted Bernoulli model as a function ...
Source: Medical and Biological Engineering and Computing - Category: Biomedical Engineering Source Type: research
Elevated LDH, B symptoms, advanced stage and failure to achieve complete response after initial treatment are clinical variables associated with shorter progression ‐free survival (PFS) in pulmonary marginal zone lymphoma (PMZL). Multifocal lung disease, extrapulmonary MZL and cavitary lesions on computed tomography scans have been identified as radiologic features associated with shorter PFS. Radiation therapy and surgery are potentially curative strategies in PMZL. AbstractPulmonary marginal zone lymphoma (PMZL) is the most common non ‐Hodgkin lymphoma affecting the lung. PMZL is usually an indolent disease. Clinical...
Source: Cancer Medicine - Category: Cancer & Oncology Authors: Tags: ORIGINAL RESEARCH Source Type: research
AbstractObjectivesTo compare the difference in mandibular canal (MC) visibility using three different cone beam computed tomography (CBCT) acquisition protocols: high resolution (HR), standard resolution (ST) and Quick scan+ (QS+).MethodsTwenty-five human dry mandibles were scanned by one CBCT machine; i-CAT FLX (Imaging Sciences International, Hatfield, PA, USA), using three different acquisition protocols: high-resolution (HR), standard (ST) and Quick scan+  (QS+). DICOM data were transferred to a third party software Ondemand 3D (Cybermed Co., Seoul, Korea). The fusion module was used to superimpose images derive...
Source: Oral Radiology - Category: Radiology Source Type: research
ConclusionsThe e-ASPECTS software generates robust values for e-ASPECTS and acute infarct volumes when using ST ≤ 4 mm with ST = 1 mm yielding the best performance for predicting baseline stroke severity and clinical outcome after 90 days.Key Points•Clinical utility of automatically derived ASPECTS from computed tomography scans was shown in patients with acute ischemic stroke and treatment with mechanical thrombectomy.•Thin slices (=  1 mm) had the highest clinical utility in comparison with thicker slices (2–10 mm) by having the strongest correlation...
Source: European Radiology - Category: Radiology Source Type: research
Publication date: August 2020Source: Cancer Epidemiology, Volume 67Author(s): Nicolas R. Smoll, John D. Mathews, Katrina J. Scurrah
Source: Cancer Epidemiology - Category: Cancer & Oncology Source Type: research
More News: Blogging | Computers | CT Scan | Dentistry | PET Scan | Statistics