Influence of pulp vitality on length determination by using the elements diagnostic unit and apex locator

2007 ◽  
Vol 104 (4) ◽  
pp. e129-e132 ◽  
Author(s):  
Eduardo Akisue ◽  
Giulio Gavini ◽  
Jose Antonio Poli de Figueiredo
Keyword(s):  
Diagnostic Unit ◽  
Length Determination ◽  
Pulp Vitality

scholarly journals Influence of embedding media on the accuracy of working length determination by means of apex locator: an ex vivo study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thomas Gerhard Wolf ◽  
Anna Krauß-Mironjuk ◽  
Richard Johannes Wierichs ◽  
Benjamín Briseño-Marroquín
Keyword(s):  
Ex Vivo ◽  
Human Teeth ◽  
Actual Working ◽  
Diagnostic Unit ◽  
Working Length ◽  
Stereo Microscope ◽  
Length Determination ◽  
Per Se ◽  
Ex Vivo Study ◽  
Electronic Apex Locator

AbstractThe aim of this research was to determine ex vivo the influence on accuracy of five different embedding media, for investigative and educational purposes, and one electronic apex locator. 110 human extracted mature roots of permanent single-rooted human teeth were used. The roots were embedded in alginate, stick sponge, 2% agar–agar and 6% and 12% gelatin. The actual working length to the physiological foramen was determined under a stereo-microscope (16 ×) and the electronic working lengths with the Elements Diagnostic Unit and a K-file ISO 10. The accuracy ranges of the accumulated measurements, when allowing a ± 0.5 mm tolerance, went from 98.2% (6% and 12% gelatin), 93.7% (alginate), 92.8% (2% agar–agar) to 91.7% (sponge). The exact measurements at the physiological foramen ranged from 80.0% (6% gelatin), 76.5% (2% agar–agar), 71.8% (12% gelatin), 68.2% (alginate) to 64.5% (sponge). Although relatively seldom (n = 24), measurements with deviations of more than ± 0.5 mm were also observed; thus, the accuracy of the working length determination results per se can be considered as clinically acceptable. The results of this research allow a recommendation of the investigated embedding media for electronic working length determination models for educational and research purposes in endodontics.

Evaluation of precision of length determination with 3 electronic apex locators: Root ZX, Elements Diagnostic Unit and Apex Locator, and RomiAPEX D-30

2007 ◽  
Vol 104 (4) ◽  
pp. e91-e94 ◽  
Author(s):  
Ricardo Affonso Bernardes ◽  
Marco A.H. Duarte ◽  
Bruno C. Vasconcelos ◽  
Ivaldo G. Moraes ◽  
Norberti Bernardineli ◽  
...  
Keyword(s):  
Diagnostic Unit ◽  
Length Determination

Agreement between Two Commonly Used Pulp Tests in Determining Pulp Vitality

2020 ◽  
Author(s):  
Tazeen Zehra
Keyword(s):  
Cold Test ◽  
P Value ◽  
Kappa Statistics ◽  
Test Results ◽  
Pulp Tissue ◽  
High Agreement ◽  
Qualitative Variables ◽  
Kappa Value ◽  
Tingling Sensation ◽  
Pulp Vitality

Background: The pulp tissue is confined within hard tissue boundaries and cannot be examined directly for health evaluation. Hence, its assessment is usually based on sensibility tests. Accurate diagnosis of the pulpal status requires evaluation with combination of sensibility tests. The objective of this study was to assess the mutual agreement between the electric pulp test and cold test in determining pulp vitality. Methods: Total 106 patients, aged 18 to 30 years, attending the dental OPD of Operative Dentistry/Endodontics department; Dr. Ishrat-ul-Ibad Institute of Oral Health Sciences, Karachi were selected for the study. The cold and electric pulp tests were used to determine the presence or absence of tingling sensation. Teeth were marked as vital in presence and non-vital in absence of any tingling or painful response. Agreement between these two tests was calculated using SPSS-18. To calculate the mean and standard deviation, descriptive statistics were applied for quantitative variables. For qualitative variables, frequencies and percentages were calculated. Kappa statistics was applied for agreement between electric pulp and cold test. Results: The cold test showed that 70.8% of the teeth were vital and 29.2% were necrotic. The electrical pulp test showed that 74.5% were vital and 25.5% were necrotic. The outcome showed 83.0% agreement between the tests; with kappa value of 0.574 which provided sufficient agreement with p-value=0.000. Conclusion: There was a high agreement found between the cold test and electric pulp test. Assessment of pulp vitality would be more accurate when EPT and Endo frost are used in combination.

scholarly journals Root canal curvature as a prognostic factor influencing the diagnostic accuracy of radiographic working length determination and postoperative canal axis modification: an in vitro comparative study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Bestoon Mohammed Faraj
Keyword(s):  
Root Canal ◽  
Radiographic Images ◽  
The Real ◽  
Root Canals ◽  
Length Estimation ◽  
Working Length ◽  
Length Determination ◽  
Case Difficulty Assessment ◽  
The Impact

Abstract Background Radiographic analysis of tooth morphology is mandatory for accurate calibration of the degree of canal curvature angle and radiographic working length to its real dimensions in case difficulty assessment protocols. This study aimed to determine the impact of the degree of root canal curvature angle on maintaining the real working length and the original canal axis of prepared root canals using a reciprocating rotary instrumentation technique. Methods Radiographic image analysis was performed on 60 extracted single-rooted human premolar teeth with a moderate canal curvature (10°–25°) and severe canal curvature (26°–70°). Working length and longitudinal canal axis were determined using cone-beam computed tomography (CBCT) and digital periapical radiography. The real canal length was determined by subtracting 0.5 mm from the actual canal length. Root canals were prepared using the WaveOne Gold reciprocating file (Dentsply Maillefer, Ballaigues, Switzerland). Results There was no significant relation of the degree of canal curvature angle to the accuracy of radiographic working length estimated on CBCT and digital periapical radiographic techniques (P > 0.05). Postinstrumentation changes in the original canal axis between moderate and severe canal curvature angles, assessed on CBCT and periapical digital radiographic images were statistically non-significant (P > 0.05). Conclusions A standardized digital periapical radiographic method performed similarly to the CBCT technique near to its true working length. No significant interaction exists between the diagnostic working length estimation, postoperative root canal axis modification, and the degree of canal curvature angle, using reciprocating rotary instrumentation technique.

Minority carrier diffusion length determination from capacitance measurements in Se–CdO photovoltaic cells

1991 ◽  
Vol 69 (3-4) ◽  
pp. 538-542 ◽  
Author(s):  
C. H. Champness ◽  
Z. A. Shukri ◽  
C. H. Chan
Keyword(s):  
Substrate Temperature ◽  
Diffusion Length ◽  
Incident Light ◽  
Photovoltaic Cells ◽  
Minority Carrier Diffusion Length ◽  
Electron Collection ◽  
Straight Line ◽  
Current Change ◽  
Length Determination ◽  
Output Capacitance

In Se–CdO photovoltaic cells, the electron diffusion length Ln in the selenium absorber layer has been determined from measurements of capacitance C and photocurrent under monochromatic illumination by variation of applied reverse bias. If penetrating incident light of band-gap wavelength is used, a plot against 1/C of the illuminated-to-dark current change ΔI yields a straight line over a certain range of bias values. Extrapolation of this line to the 1/C axis yields Ln. It was found in the fabrication of the Se–CdO cells that increasing the substrate temperature from 100 to 140 °C during the selenium deposition resulted in an increase in the cell photovoltaic output. Capacitance and ΔI measurements on these cells showed an increase in diffusion length with substrate temperature, indicating that the increased cell performance was due to improved electron collection in the selenium layer.

scholarly journals Dental Pulp Testing: A Review

2009 ◽  
Vol 2009 ◽  
pp. 1-12 ◽  
Author(s):  
Eugene Chen ◽  
Paul V. Abbott
Keyword(s):  
Blood Flow ◽  
Clinical Practice ◽  
Pulse Oximetry ◽  
Diagnostic Test ◽  
Laser Doppler Flowmetry ◽  
Dental Pulp ◽  
Sensory Response ◽  
Diagnostic Aid ◽  
Doppler Flowmetry ◽  
Pulp Vitality

Dental pulp testing is a useful and essential diagnostic aid in endodontics. Pulp sensibility tests include thermal and electric tests, which extrapolate pulp health from sensory response. Whilst pulp sensibility tests are the most commonly used in clinical practice, they are not without limitations and shortcomings. Pulp vitality tests attempt to examine the presence of pulp blood flow, as this is viewed as a better measure of true health than sensibility. Laser Doppler flowmetry and pulse oximetry are examples of vitality tests. Whilst the prospect is promising, there are still many practical issues that need to be addressed before vitality tests can replace sensibility tests as the standard clinical pulp diagnostic test. With all pulp tests, the results need to be carefully interpreted and closely scrutinised as false results can lead to misdiagnosis which can then lead to incorrect, inappropriate, or unnecessary treatment.

A Comparison Between Ladell's Wood Section Method and the Macerated Wood Method for Tracheid Length Determination

IAWA Journal ◽  
1983 ◽  
Vol 4 (4) ◽  
pp. 245-247 ◽  
Author(s):  
A. P. Wilkins ◽  
R. K. Bamber
Keyword(s):  
Sample Preparation ◽  
Traditional Method ◽  
Precise Location ◽  
Section Method ◽  
Tracheid Length ◽  
Wood Section ◽  
Length Determination

A comparison has been made between the method of Ladell, in which tangential longitudinal sections are used for the determination of mean tracheid length and the traditional method using macerated wood. The two methods produced identical results. Ladell's method was quicker, enabled precise location of measured cells and required less sample preparation.

Simplified test of pulp vitality

1978 ◽  
Vol 6 (1) ◽  
pp. 83
Author(s):  
Andrew Richardson
Keyword(s):  
Pulp Vitality
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