scholarly journals A controlled study on the accuracy and precision of intra-oral radiography in assessing interproximal bone defect morphology around implants

2017 ◽  
Vol 28 ◽  
pp. 287-287
Keyword(s):  
Bone Defect ◽  
Controlled Study ◽  
Accuracy And Precision ◽  
Defect Morphology

scholarly journals A rapid point-of-care assay accurately measures vitamin D

2021 ◽  
Author(s):  
K. Albrecht ◽  
J. Lotz ◽  
L. Frommer ◽  
K. J. Lackner ◽  
G. J. Kahaly
Keyword(s):  
Vitamin D ◽  
Metabolic Pathways ◽  
Point Of Care ◽  
Immunofluorescence Assay ◽  
Laboratory Method ◽  
Controlled Study ◽  
Mean Deviation ◽  
Serum Samples ◽  
Assay Validation ◽  
Accuracy And Precision

Abstract Purpose Vitamin D (VitD) is a pleiotropic hormone with effects on a multitude of systems and metabolic pathways. Consequently, the relevance of a sufficiently high VitD serum level becomes self-evident. Methods A rapid immunofluorescence assay designed for the point-of-care measurement of serum VitD3 solely was tested. Inter- and intra-assay validation, double testing and result comparison with a standardized laboratory method were performed. Results An overall linear correlation of r = 0.89 (Pearson, 95% CI 0.88–0.92, p < 0.01) between the point of care and the conventional reference assay was registered. Accuracy and precision were of special interest at cut-points (10 ng/ml [mean deviation 1.7 ng/ml, SD 1.98 ng/ml, SE 0.16 ng/ml], 12 ng/ml [MD 0.41, SD 1.89, SE 0.19] and 30 ng/ml [MD − 1.11, SD 3.89, SE 0.35]). Only a slight deviation was detected between the two assays when using fresh (r = 0.91, 95% CI 0.86–0.94, p < 0.01) and frozen serum samples (r = 0.86, 0.82–0.89, p < 0.01). Results remained steady when samples were frozen several times. Inter- and intra-assay validation according to the CLSI protocol as well as multiuser testing showed stable results. Conclusion This novel, innovative, and controlled study indicates that the evaluated rapid point of care VitD assay is reliable, accurate, and suited for clinical practice.

scholarly journals Diagnosis and treatment of extraction sockets in preparation for implant placement: report of three cases

2008 ◽  
Vol 19 (2) ◽  
pp. 159-164 ◽  
Author(s):  
Márcio José Rodrigues Barcelos ◽  
Arthur Belém Novaes Júnior ◽  
Marcio Baltazar Conz ◽  
Nassin David Harari ◽  
Guaracilei Maciel Vidigal Júnior
Keyword(s):  
Bone Defect ◽  
Root Resorption ◽  
Case Reports ◽  
Receptor Site ◽  
Wall Defect ◽  
Implant Placement ◽  
Immediate Implants ◽  
Immediate Implant ◽  
Defect Morphology ◽  
Subsequent Intervention

This article addresses diagnostic parameters that should be assessed in the treatment of extraction sockets with dental implant placement by presenting three case reports that emphasize the relevance of the amount of remaining bone walls. Diagnosis was based on the analysis of clinical and radiographic parameters (e.g.: bone defect morphology, remaining bone volume, presence of infections on the receptor site). Case 1 presents a 5-wall defect in the maxillary right central incisor region with severe root resorption, which was treated with immediate implant placement. Cases 2 and 3 present, respectively, two- and three-wall bone defects that did not have indication for immediate implants. These cases were first submitted to a guided bone regeneration (GBR) procedure with bone graft biomaterial and membrane barriers, and the implants were installed in a second surgical procedure. The analysis of the preoperative periodontal condition of the adjacent teeth and bone defect morphology is extremely important because these factors determine the choice between immediate implant or GBR treatment followed by implant installation in a subsequent intervention.

Pulling at the Digital Thread: Exploring the Tolerance Stack Up in Scan to Print Processes

2018 ◽  
Author(s):  
Tobias Mahan ◽  
Brenna Doyle ◽  
Nicholas Meisel ◽  
Jessica Menold
Keyword(s):  
Reverse Engineering ◽  
New Product Development ◽  
Digital Model ◽  
Controlled Study ◽  
Seamless Integration ◽  
Prosthetic Devices ◽  
Accuracy And Precision ◽  
3D Printers ◽  
Using Data ◽  
Printing Processes

The rise of affordable rapid non-contact digitizers and rapid prototyping tools, such as 3D printers, is enabling the seamless integration of geometric reverse engineering into the early phases of engineering design. Scanning technology has been widely adopted in bio-reverse engineering and the use of high fidelity non-contact scanners, such as Computed Tomography devices, allows designers, doctors, and researchers to digitally model boney structures, design orthotic and prosthetic devices, and preemptively plan complex surgeries. While the combination of 3D scanning and printing processes holds much promise for the fields of reverse engineering, biodesign, and new product development, problems with repeatability, accuracy, and precision have limited the wider spread adoption of 3D scan to print processes. While some studies have explored the errors inherent in higher fidelity scan to print (S2P) processes, no studies have explored the errors in S2P processes that leverage affordable rapid non-contact digitizers. The purpose of this study was to explore at which phases of the S2P process errors are introduced into the digital model. A controlled study was conducted using data from 27 scans using a common off-the-shelf non-contact optical digitizer and a relatively simple workpiece. Data from the digital thread was collected between each phase of the S2P process and compared against a truth model; the geometric and dimensional integrity of the data was calculated through a comparison between the digital model and the original truth model. Results indicate significant differences between digital models at the various steps of the S2P process.

Accuracy of cone beam computed tomography in assessing peri-implant bone defect regeneration: a histologically controlled study in dogs

2011 ◽  
Vol 23 (7) ◽  
pp. 882-887 ◽  
Author(s):  
Tim Fienitz ◽  
Frank Schwarz ◽  
Lutz Ritter ◽  
Timo Dreiseidler ◽  
Juergen Becker ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Bone Defect ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Controlled Study

scholarly journals Effects of femoral bone defect morphology on initial polished tapered stem stability in massive defect model: a biomechanical study

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Tohru Irie ◽  
Daisuke Takahashi ◽  
Tsuyoshi Asano ◽  
Tomohiro Shimizu ◽  
Ryuta Arai ◽  
...  
Keyword(s):  
Bone Defect ◽  
Biomechanical Study ◽  
Femoral Bone ◽  
Defect Model ◽  
Tapered Stem ◽  
Stem Stability ◽  
Defect Morphology

Application of a Simple Cold Stub to the Direct Observation of Frozen Hydrated Sand

1973 ◽  
Vol 31 ◽  
pp. 212-213
Author(s):  
John M. Wehrung ◽  
Richard J. Harniman
Keyword(s):  
United States ◽  
Surface Water ◽  
Direct Observation ◽  
Controlled Study ◽  
Clay Particles ◽  
Organic Debris ◽  
Rock Formations ◽  
Water Tables ◽  
Permeable Rock ◽  
Natural Means

Water tables in aquifer regions of the southwest United States are dropping off at a rate which is greater than can be replaced by natural means. It is estimated that by 1985 wells will run dry in this region unless adequate artificial recharging can be accomplished. Recharging with surface water is limited by the plugging of permeable rock formations underground by clay particles and organic debris.A controlled study was initiated in which sand grains were used as the rock formation and water with known clay concentrations as the recharge media. The plugging mechanism was investigated by direct observation in the SEM of frozen hydrated sand samples from selected depths.

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