scholarly journals Conformation of Adjacent Self-expanding Stents: A Cross-Sectional In Vitro Study

2006 ◽  
Vol 29 (2) ◽  
pp. 255-259 ◽  
Author(s):  
Marion Hughes ◽  
Andrew R. Forauer ◽  
Mats Lindh ◽  
Wojciech Cwikiel
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Cross Sectional

scholarly journals In Vitro Study on the Effect of a New Bioactive Desensitizer on Dentin Tubule Sealing and Bonding

2020 ◽  
Vol 11 (2) ◽  
pp. 38
Author(s):  
Minh N. Luong ◽  
Laurie Huang ◽  
Daniel C. N. Chan ◽  
Alireza Sadr
Keyword(s):  
Bond Strength ◽  
In Vitro Study ◽  
Vitro Study ◽  
Acid Pretreatment ◽  
Universal Adhesive ◽  
Cross Sectional ◽  
Before And After ◽  
Human Dentin ◽  
Microshear Bond Strength

Bioactive mineral-based dentin desensitizers that can quickly and effectively seal dentinal tubules and promote dentin mineralization are desired. This in vitro study evaluated a novel nanohydroxyapatite-based desensitizer, Predicta (PBD, Parkell), and its effect on bond strength of dental adhesives. Human dentin discs (2-mm thick) were subjected to 0.5 M EDTA to remove the smear layer and expose tubules, treated with PBD, and processed for surface and cross-sectional SEM examination before and after immersion in simulated body fluid (SBF) for four weeks (ISO 23317-2014). The effects of two dental desensitizers on the microshear bond strength of a universal adhesive and a two-step self-etch system were compared. SEM showed coverage and penetration of nanoparticles in wide tubules on the PBD-treated dentin at the baseline. After four weeks in SBF, untreated dentin showed amorphous mineral deposits while PBD-treated dentin disclosed a highly mineralized structure integrated with dentin. Desensitizers significantly reduced microshear bond strength test (MSBS) of adhesives by 15–20% on average, depending on the bonding protocol. In conclusion, PBD demonstrated effective immediate tubules sealing capability and promoted mineral crystal growth over dentin and into the tubules during SBF-storage. For bonding to desensitizer-treated dentin, a two-step self-etching adhesive or universal bond with phosphoric acid pretreatment are recommended.

scholarly journals Dimensional Accuracy and Details of the Panoramic Cross-sectional Tomographic Images: An in vitro Study

2012 ◽  
Vol 13 (1) ◽  
pp. 85-97
Author(s):  
M Ashwini Kumar ◽  
Bharat Mody ◽  
Gopa Kumar R Nair ◽  
LR Surender ◽  
S Sujatha Gopal ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Tomographic Imaging ◽  
Vitro Study ◽  
Imaging Modalities ◽  
Angular Distortion ◽  
Cross Sectional ◽  
Tomographic Images

ABSTRACT Introduction Transversal slicing system (TSS) of Planmeca PM 2002 CC is a tomographic technique which enables us to take cross-sectional views of jaws. Tomographic imaging modalities are commonly applied to acquire cross-sectional images of the jaws for preimplant assessment of bone. Among the available tomographic imaging modalities, panoramic radiography is the most accessible imaging system. Materials and methods Study was conducted using 25 mandibles, out of these five were used for linear dimensional accuracy measurement and the rest 20 were utilized to study the details within the mandible. Study was aimed to evaluate dimensional stability in the images using different parameters, such as determination of direction of slice, determination of horizontal and vertical magnification, angular distortion, threedimensional distortion and determination of details. Results For the direction of slice and for determination of horizontal and vertical magnification change in + 5° to – 5° was in acceptable limit. In determination of details, it was found that there was great discrepancy in readings given by nonradiologist which offset the mean value which was attributed to lack of training for interpretation of the observers. Conclusion 99% of the readings were in the clinically acceptable limits. Clinical significance The easy availability, use of routine equipment, the low cost, low radiation dose for cross-sectional radiography make the TSS most preferred modality. How to cite this article Kumar MA, Mody B, Nair GKR, Surender LR, Gopal SS, Prasad RVKA. Dimensional Accuracy and Details of the Panoramic Cross-sectional Tomographic Images: An in vitro Study. J Contemp Dent Pract 2012;13(1):85-97.

scholarly journals Biomimetic Mechanism of Action of Fluoridated Toothpaste Containing Proprietary REFIX Technology on the Remineralization and Repair of Demineralized Dental Tissues: An in vitro Study

2020 ◽  
Author(s):  
Fabiano Vieira Vilhena ◽  
Sonia Mariza Luiz de Oliveira ◽  
Marcelo Henrick Maia Matochek ◽  
Pedro Luiz Santos Tomaz ◽  
Thales de Sá Oliveira ◽  
...  
Keyword(s):  
Mechanism Of Action ◽  
Elemental Analysis ◽  
In Vitro Study ◽  
Vitro Study ◽  
Control Group ◽  
Cross Sectional ◽  
Dentinal Tubules ◽  
Dental Tissues ◽  
Ph Cycling

Abstract Objectives This in vitro study aimed to characterize the mineral content and surface and cross-sectional morphology of enamel and dentin tissues treated with a 1450 ppm fluoride-containing toothpaste with REFIX technology. Materials and Methods Bovine enamel blocks (n = 5) were obtained (4 × 4 × 6 mm), demineralized (artificial caries lesion), and treated (pH cycling and brushing with the toothpaste). During the pH cycling, which lasted for 7 days (demineralization and remineralization took 6 and 18 hours, respectively), the enamel was brushed for 5 minutes using an electric toothbrush before being immersed in a remineralizing solution. The dentin blocks were acid-etched for 2 minutes (0.05 M citric acid, pH 1.8) to expose the dentinal tubules (n = 5). Morphological analysis of the dentin was performed immediately and after 7 days of brushing with the dentifrice, and compared with the control group. The specimens were then cross-sectioned. The surface and cross-sectional micromorphology were assessed using scanning electron microscopy (SEM). The elemental analyses (weight%) were determined with an energy-dispersive X-ray spectroscopy (EDS). Results The toothpaste with REFIX technology remineralized and repaired the surface enamel effectively. The elemental analysis also demonstrated that treating the enamel with the toothpaste formed a silicon-enriched mineral layer on the enamel surface. Elemental analysis of the enamel cross-sections showed that the toothpaste induced a mineral change. The results were also consistent in the dentin, where the dentinal tubules were progressively occluded until there was complete occlusion after 7 days. Conclusions We prove the biomimetic mechanism of action of fluoridated toothpaste containing proprietary REFIX technology for obtaining silicon-enriched, remineralized and repaired dental tissues.

Cross-sectional microhardness of bovine enamel subjected to three paediatric liquid oral medicines: an in vitro study

2012 ◽  
Vol 13 (5) ◽  
pp. 261-265 ◽  
Author(s):  
D. N. Soares ◽  
A. C. Valinoti ◽  
V. S. S. Pierro ◽  
A. G. Antonio ◽  
L. C. Maia
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Cross Sectional ◽  
Bovine Enamel

Glucocorticoid gene signatures in systemic lupus erythematosus and the effects of type I interferon: a cross-sectional and in-vitro study

2021 ◽  
Vol 3 (5) ◽  
pp. e357-e370
Author(s):  
Melissa Northcott ◽  
Linden J Gearing ◽  
Hieu T Nim ◽  
Champa Nataraja ◽  
Paul Hertzog ◽  
...  
Keyword(s):  
Systemic Lupus Erythematosus ◽  
Lupus Erythematosus ◽  
Type I Interferon ◽  
In Vitro Study ◽  
Vitro Study ◽  
Type I ◽  
Systemic Lupus ◽  
Cross Sectional ◽  
Gene Signatures

scholarly journals Fracture Load of CAD/CAM Fabricated Cantilever Implant-Supported Zirconia Framework: An In Vitro Study

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2259
Author(s):  
Ibraheem F. Alshiddi ◽  
Syed Rashid Habib ◽  
Muhammad Sohail Zafar ◽  
Salwa Bajunaid ◽  
Nawaf Labban ◽  
...  
Keyword(s):  
Testing Machine ◽  
In Vitro Study ◽  
Milling Process ◽  
Fracture Load ◽  
Vitro Study ◽  
Cross Sectional ◽  
Cantilever Length ◽  
Computer Aided ◽  
Cad Cam

The fracture resistance of computer-aided designing and computer-aided manufacturing CAD/CAM fabricated implant-supported cantilever zirconia frameworks (ISCZFs) is affected by the size/dimension and the micro cracks produced from diamond burs during the milling process. The present in vitro study investigated the fracture load for different cross-sectional dimensions of connector sites of implant-supported cantilever zirconia frameworks (ISCZFs) with different cantilever lengths (load point). A total of 48 ISCZFs (Cercon, Degudent; Dentsply, Deutschland, Germany) were fabricated by CAD/CAM and divided into four groups based on cantilever length and reinforcement of distal-abutment: Group A: 9 mm cantilever; Group B: 9 mm cantilever with reinforced distal-abutment; Group C: 12 mm cantilever; Group D: 12 mm cantilever with reinforced distal-abutment (n = 12). The ISCZFs were loaded using a universal testing machine for recording the fracture load. Descriptive statistics, ANOVA, and Tukey’s test were used for the statistical analysis (p < 0.05). Significant variations were found between the fracture loads of the four ISCZFs (p = 0.000); Group-C and B were found with the weakest and the strongest distal cantilever frameworks with fracture load of 670.39 ± 130.96 N and 1137.86 ± 127.85 N, respectively. The mean difference of the fracture load between groups A (810.49 + 137.579 N) and B (1137.86 ± 127.85 N) and between C (670.39 ± 130.96 N) and D (914.58 + 149.635 N) was statistically significant (p = 0.000). Significant variations in the fracture load between the ISCZFs with different cantilever lengths and thicknesses of the distal abutments were found. Increasing the thickness of the distal abutment only by 0.5 mm reinforces the distal abutments by significantly increasing the fracture load of the ISCZFs. Therefore, an increase in the thickness of the distal abutments is recommended in patients seeking implant-supported distal cantilever fixed prostheses.

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