Guided Endodontics: Volume of Dental Tissue Removed by Guided Access Cavity Preparation—An Ex Vivo Study

2020 ◽  
Vol 46 (12) ◽  
pp. 1907-1912
Author(s):  
Marco Antônio Z. Loureiro ◽  
Marcela R.A. Elias ◽  
Lucas R. Capeletti ◽  
Julio A. Silva ◽  
Patrícia C. Siqueira ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Dental Tissue ◽  
Cavity Preparation ◽  
Ex Vivo Study

scholarly journals Air Quality in a Dental Clinic during Er:YAG Laser Usage for Cavity Preparation on Human Teeth—An Ex-Vivo Study

2021 ◽  
Vol 18 (20) ◽  
pp. 10920
Author(s):  
Angeliki Karveli ◽  
Ioannis G. Tzoutzas ◽  
Panagiotis Ioannis Raptis ◽  
Emmanouil-George C. Tzanakakis ◽  
Eleftherios Terry R. Farmakis ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Er:Yag Laser ◽  
Ex Vivo ◽  
Working Environment ◽  
Dental Clinic ◽  
Dental Tissue ◽  
Cavity Preparation ◽  
Human Teeth ◽  
Limit Values

Chemical air pollution in dental clinics consists of the emission of gases and particulate matter (PM), both generated by dental equipment and tooth tissues. One basic application of Erbium Laser devices is cavity preparation on human teeth due to its strong affinity to water and hydroxyapatite. The objective of this study was the evaluation of indoor air quality during the application of an Er:YAG laser, as a dentin removal instrument, in a Dental Clinic. Particulate Matter (PM) was measured using the standard method of EN legislation. In order to measure total Volatile Organic compounds (VOCs), a portable monitor was used. In the first experiment, PM10 and PM2.5 concentrations were increased by approximately 10 and 15 times, respectively. From the second experiment it can be concluded that neither of the measured particle concentrations exceeded the recommended indoor limit values while windows were open, although laser influence was still detectable. Within the limitations applied herein, it was found that Er:YAG laser activity for hard dental tissue removal was associated with high PM and TVOCs concentration values in the working environment, under insufficient or no ventilation. Physical ventilation in the aforementioned setting proved to be an important key factor in improving air quality, as both PM and TVOCs concentrations decreased significantly.

scholarly journals Root ZX Electronic Foramen Locator: An Ex Vivo Study of Its Three Models’ Precision and Reproducibility

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Bernardo Almeida Aguiar ◽  
Rafael Santos Reinaldo ◽  
Luciana Maria Arcanjo Frota ◽  
Mônica Sampaio do Vale ◽  
Bruno Carvalho de Vasconcelos
Keyword(s):  
Gold Standard ◽  
Ex Vivo ◽  
Cavity Preparation ◽  
The Real ◽  
Tukey Test ◽  
Performance Differences ◽  
The Mean ◽  
Ex Vivo Study ◽  
Digital Caliper

Although Root ZX is considered the gold standard electronic foramen locator (EFL), two variations of this device were launched, however without different operating mechanisms. This investigation aims to evaluate the precision of Root ZX (RZX), Root ZX II (RII), and Root ZX Mini (RM) EFLs. After access cavity preparation, 32 mandibular single rooted human premolars had their real length measured with the aid of a #15 K-type manual file under magnification (25x). Electronic measurements were performed by the devices in an alternate order until the apical foramen was reached (0.0). Each measurement was performed with adjusted file to the real length of the teeth and verified with a digital caliper. The accuracy of the EFLs was 68.8% (RZX), 65.8% (RII), and 68.8% (RM), considering ±0.5 mm as a margin of tolerance. The mean errors of the devices were0.37±0.25 mm (RZX),0.41±0.34 mm (RII), and0.32±0.28 mm (RM). ANOVA and Tukey test were applied to analyze the obtained data, which showed that there were no statistically significant differences among the locators (P>.05). It can be concluded that the three tested devices demonstrated precise measurements of the real length of the canal without performance differences among them.

scholarly journals A Comparative evaluation of three different Ni-Ti rotary files using Crown Down technique. An Exvivo study using C T scan

2017 ◽  
Vol 16 (2) ◽  
pp. 212-218
Author(s):  
Akanksha Bhatt ◽  
B Rajkumar ◽  
Vishesh Gupta
Keyword(s):  
Ct Scan ◽  
Comparative Evaluation ◽  
Ex Vivo ◽  
Medical Science ◽  
File Systems ◽  
Type I ◽  
Cavity Preparation ◽  
Root Canals ◽  
Canal Transportation ◽  
Ex Vivo Study

Objective: This ex-vivo study evaluated and compared the canal transportation of the prepared root canals and centering ratio maintained by Mtwo, Protaper and Twited Ni-Ti rotary files using Crown-Down technique.Materials and Method: Thirty non-carious extracted permanent human maxillary central incisors without any fracture and having Vertucci type I canal configuration were selected. The teeth were divided into 3 groups each group comprising of ten teeth. All the teeth were mounted on a wax block and pre instrumented canal CT Scan was performed. Access cavity preparation was done in group samples and canal was prepared using crown down technique by Mtwo, Protaper and Twisted NiTi Rotary file systems for the respective groups. Image analysis was done at 9 levels to access transportation and centricity ratio from pre and post instrumented CT scan images. The results showed that Software program determined the volume of pre and post instrumented canals.Results: The Canal transportation occurred least in root canals prepared by Twisted files, followed by canals prepared by Mtwo files and Protaper files. Centricity ratio was maintained the best in root canals prepared by twisted files.Conclusion: Within the parameters of this study, canals prepared by Twisted Files showed a well centered preparation and maintained the original shape of the root canal without any aberrations.Bangladesh Journal of Medical Science Vol.16(2) 2017 p.212-218

Direct Visualization of A2, A3, and A4 Finger Flexor Pulley Injuries at 3-T and 7-T MRI: An Ex Vivo Study

2020 ◽  
Author(s):  
Rafael Heiss ◽  
Frank W. Roemer ◽  
Christoph Lutter ◽  
Rolf Janka ◽  
Volker Schöffl ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Direct Visualization ◽  
Ex Vivo Study

Impact of metal artefacts in QCT of the hip caused by a contralateral Gamma type nail: an ex vivo study

2014 ◽  
Author(s):  
Klaus Engelke ◽  
Nicolas Bouler ◽  
Oleg Museyko Fuerst ◽  
Sebastien Parratte ◽  
Thomas Fuerst ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Metal Artefacts ◽  
Ex Vivo Study

Interactions between programmable shunt valves and magnetically controlled growing rods for scoliosis

2020 ◽  
Vol 26 (6) ◽  
pp. 667-670
Author(s):  
Thomas Larrew ◽  
Mohammed Alshareef ◽  
Robert F. Murphy ◽  
Ramin Eskandari ◽  
Libby Kosnik Infinger
Keyword(s):  
Remote Control ◽  
Ex Vivo ◽  
Shunt Valve ◽  
Growing Rods ◽  
Growing Rod ◽  
Before And After ◽  
Magnetically Controlled Growing Rods ◽  
Ex Vivo Study

OBJECTIVEAlthough the advent of magnetic growing rod technology for scoliosis has provided a means to bypass multiple hardware lengthening operations, it is important to be aware that many of these same patients have a codiagnosis of hydrocephalus with magnet-sensitive programmable ventricular shunts. As the magnetic distraction of scoliosis rods has not previously been described to affect the shunt valve setting, the authors conducted an investigation to characterize the interaction between the two devices.METHODSIn this ex vivo study, the authors carried out 360 encounters between four different shunt valve types at varying distances from the magnetic external remote control (ERC) used to distract the growing rods. Valve settings were examined before and after every interaction with the remote control to determine if there was a change in the setting.RESULTSThe Medtronic Strata and Codman Hakim valves were found to have setting changes at distances of 3 and 6 inches but not at 12 inches. The Aesculap proGAV and Codman Certas valves, typically described as MRI-resistant, did not have any setting changes due to the magnetic ERC regardless of distance.CONCLUSIONSAlthough it is not necessary to check a shunt valve after every magnetic distraction of scoliosis growing rods, if there is concern that the magnetic ERC may have been within 12 inches (30 cm) of a programmable ventricular shunt valve, the valve should be checked at the bedside with a programmer or with a skull radiograph along with postdistraction scoliosis radiographs.

Aryl Maleimides as Apoptosis Inducers on L5178-Y Murine Leukemia Cells (in silico, in vitro and ex vivo Study)

2016 ◽  
Vol 16 (12) ◽  
pp. 1615-1621 ◽  
Author(s):  
Erik Andrade-Jorge ◽  
Marycarmen Godínez-Victoria ◽  
Luvia Enid Sánchez-Torres ◽  
Luis Humberto Fabila-Castillo ◽  
José G. Trujillo-Ferrara
Keyword(s):  
In Silico ◽  
Ex Vivo ◽  
Leukemia Cells ◽  
Ex Vivo Study ◽  
Murine Leukemia
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