scholarly journals Determination of Tooth Length Variation Of Maxillary Canine - An Analytical Study

2015 ◽  
Vol 3 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Deependra Naulakha ◽  
Manish Agrawal ◽  
Nootan Naulakha
Keyword(s):  
Analytical Study ◽  
Length Variation ◽  
X Rays ◽  
Pulp Tissue ◽  
Maxillary Canine ◽  
Working Length ◽  
Radiographic Interpretation ◽  
Maximum Minimum ◽  
Tooth Length

Aim: The Aim of this study was to assess the variation in anatomical tooth length of maxillary canine, irrespective of sex, in patient's presenting at NMCTH, Biratnagar, Nepal.   Methodology: A total of 30 Endodontically treated maxillary canine were included in this study. Preoperative radiographs were taken initially for finding the canal length. Radiographic interpretation (IOPA X-rays) and mathematical calculation, proposed by Ingles and messing, were used to observe and measure the length of individual root canal for tooth length. An endodontic access was prepared and pulp tissue was extirpated. A working length radiograph was taken with a file in the canal and the radiographic working length was established. Results: This study revealed that the maximum, minimum and average tooth length of maxillary canine is 30mm, 18mm and 22.91 mm respectively. Conclusion: The result indicates that the study previously performed by different researchers and those given in the different textbook of endodontics showed that the tooth length is shorter than the caucasoid counterpart.DOI: http://dx.doi.org/10.3126/jonmc.v3i1.12236Journal of Nobel Medical CollegeVol. 3, No.1 Issue 6, 2014, Page: 40-45

scholarly journals Influence of cervical preflaring on determination of apical file size in maxillary molars: SEM analysis

2005 ◽  
Vol 16 (3) ◽  
pp. 181-186 ◽  
Author(s):  
José Roberto Vanni ◽  
Roberto Santos ◽  
Orlando Limongi ◽  
Danilo M. Zanello Guerisoli ◽  
Alexandre Capelli ◽  
...  
Keyword(s):  
Cross Sections ◽  
Root Apex ◽  
Sem Analysis ◽  
Pulp Tissue ◽  
Maxillary Molars ◽  
Canal Diameter ◽  
Working Length ◽  
Major Discrepancy ◽  
Post Hoc

The purpose of this study was to investigate the influence of cervical preflaring on determination of the initial apical file in mesiobuccal roots of maxillary molars. Fifty first molars with degree of curvature of the mesiobuccal root between 10° and 15° were utilized. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm from the root apex. Five groups (n=10) were formed at random, according to the type of cervical preflaring performed. In group 1, the size of the initial apical file was determined without cervical preflaring. In groups 2 to 5, the cervical and middle thirds of the canals were preflared with Gates-Glidden drills, K3 Orifice Opener instruments, ProTaper instruments and LA Axxess burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The binding instruments were fixed into the canals at the WL with methylcyanacrylate. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between the canal diameter and the diameter of first file to bind at the WL were calculated using UTHSCSA ImageTool software. Data were analyzed statistically by ANOVA and multiple comparisons were done by Tukey's HSD post-hoc test. Significant differences (p<0.001) were found among the groups. The major discrepancy was observed for the group without preflaring (mean 0.1543 mm ± 0.0216). Cervical preflaring with LA Axxess burs produced the least discrepancies between the canal size and the diameter of the initial apical instrument (mean 0.026 mm ± 0.0037), followed by ProTaper files (mean 0.0567 mm ± 0.0354). Canals preflared with Gates-Glidden drills and K3 Orifice Opener instruments showed statistically similar discrepancy results to each other (p>0.05) (means 0.1167 mm ± 0.0231 and 0.1313 mm ± 0.0344, respectively). In conclusion, preflaring of the cervical and middle thirds improved the determination of the initial apical instrument. Canals preflared with LA Axxess burs showed a more accurate binding of the files to the anatomical diameter at the WL in the mesiobuccal roots of maxillary first molars.

Determination of Total Length in Human Permanent Teeth - An Anthropometric Study

2016 ◽  
Vol 695 ◽  
pp. 20-24
Author(s):  
Mugur George Popescu ◽  
Diana Marian ◽  
Ramona Amina Popovici ◽  
Teodora Ștefănescu
Keyword(s):  
Root Canal ◽  
Population Group ◽  
Geographic Area ◽  
Permanent Teeth ◽  
X Ray ◽  
Working Length ◽  
Exact Determination ◽  
Anthropometric Study ◽  
Tooth Length

The correct endodontic treatment involves the exact determination of the working length. This is accomplished by combining several techniques: the tactile technique, X-ray with the needle or the endodontic probe in the root canal and comparing with the average tooth length.The determination of average tooth length depends on the geographic area. The current table used in practice contains the values gathered on a population group that is different than ours; the table has been made on Caucasian subjects.In conclusion, our study aims to determine the proper average values of our geographic zone, the table obtained by completing the equation of the endodontic therapy that will admit the proximity of the Romanian reality.

Problems in Thin-Film X-ray Quantification

1990 ◽  
Vol 48 (2) ◽  
pp. 458-459
Author(s):  
J N Chapman ◽  
W A P Nicholson
Keyword(s):  
Thin Film ◽  
Specimen Thickness ◽  
X Rays ◽  
Characteristic Peak ◽  
Local Composition ◽  
X Ray ◽  
Measured Ratio ◽  
Path Lengths ◽  
Composition Changes

Energy dispersive x-ray microanalysis (EDX) is widely used for the quantitative determination of local composition in thin film specimens. Extraction of quantitative data is usually accomplished by relating the ratio of the number of atoms of two species A and B in the volume excited by the electron beam (nA/nB) to the corresponding ratio of detected characteristic photons (NA/NB) through the use of a k-factor. This leads to an expression of the form nA/nB = kAB NA/NB where kAB is a measure of the relative efficiency with which x-rays are generated and detected from the two species.Errors in thin film x-ray quantification can arise from uncertainties in both NA/NB and kAB. In addition to the inevitable statistical errors, particularly severe problems arise in accurately determining the former if (i) mass loss occurs during spectrum acquisition so that the composition changes as irradiation proceeds, (ii) the characteristic peak from one of the minority components of interest is overlapped by the much larger peak from a majority component, (iii) the measured ratio varies significantly with specimen thickness as a result of electron channeling, or (iv) varying absorption corrections are required due to photons generated at different points having to traverse different path lengths through specimens of irregular and unknown topography on their way to the detector.

scholarly journals Determination of the Vertical Dimension and the Position of the Occlusal Plane in a Removable Prosthesis Using Cephalometric Analysis and Golden Proportion

2021 ◽  
Vol 11 (15) ◽  
pp. 6948
Author(s):  
Gabriele Cervino ◽  
Sergio Sambataro ◽  
Chiara Stumpo ◽  
Salvatore Bocchieri ◽  
Fausto Murabito ◽  
...  
Keyword(s):  
Vertical Dimension ◽  
Occlusal Plane ◽  
X Rays ◽  
Common Procedure ◽  
Lower Incisor ◽  
Golden Proportion ◽  
The Face ◽  
Removable Prosthesis ◽  
Edentulous Patients

The aim of this study is to demonstrate the use and the effectiveness of cephalometry and golden proportions analysis of the face in planning prosthetic treatments in totally edentulous patients. In order to apply this method, latero-lateral and posterior-anterior X-rays must be performed in addition to the common procedure. Two main concerns for totally edentulous patients are the establishment of the vertical dimension and the new position of the occlusal plane. The divine proportion analysis was carried out by the use of a golden divider. The prosthetic protocol was divided into three steps and a case was selected for better understanding. Referring to the golden relations, if the distance from the chin to the wing of the nose is 1.0, the distance from the nose to eye is 0.618. This proportion is useful and effective in determining the correct prosthetic vertical dimension. The incisal margin of the lower incisor must be positioned between Point A (A) and protuberance menti (Pm) according to the gold ratio 0.618 of the total height A-Pm. Posteriorly the occlusal plane must be placed 2 mm below the divine occlusal plane (traced from the incisal margin of lower incisors to Xi point). A prosthesis made in accordance with cephalometric parameters and divine proportions of the face helps to improve the patient’s aesthetics, function and social personality.

scholarly journals Determination of the Efficiency of Production of X-Rays

1918 ◽  
Vol 14 (54) ◽  
pp. 33-33
Author(s):  
P. T. Weeks
Keyword(s):  
X Rays

scholarly journals Electronic Excitations and Radiation Damage in Macromolecular Crystallography

Crystals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 273 ◽  
Author(s):  
José Brandão-Neto ◽  
Leonardo Bernasconi
Keyword(s):  
Chemical Information ◽  
X Rays ◽  
Electronic Excitations ◽  
Macromolecular Crystallography ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Structures ◽  
Successful Approach ◽  
Structural Research

Macromolecular crystallography at cryogenic temperatures has so far provided the majority of the experimental evidence that underpins the determination of the atomic structures of proteins and other biomolecular assemblies by means of single crystal X-ray diffraction experiments. One of the core limitations of the current methods is that crystal samples degrade as they are subject to X-rays, and two broad groups of effects are observed: global and specific damage. While the currently successful approach is to operate outside the range where global damage is observed, specific damage is not well understood and may lead to poor interpretation of the chemistry and biology of the system under study. In this work, we present a phenomenological model in which specific damage is understood as the result of a single process, the steady excitation of crystal electrons caused by X-ray absorption, which acts as a trigger for the bulk effects that manifest themselves in the form of global damage and obscure the interpretation of chemical information from XFEL and synchrotron structural research.

scholarly journals Relationship between Body Mass Index and Tooth Decay in a Population of 3–6-Year-Old Children in Iran

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Leila Shafie Bafti ◽  
Maryam Alsadat Hashemipour ◽  
Hamidreza Poureslami ◽  
Zeinab Hoseinian
Keyword(s):  
Body Weight ◽  
Analytical Study ◽  
Deciduous Teeth ◽  
Tooth Decay ◽  
Cross Sectional ◽  
Dmft Index ◽  
The Mean ◽  
Iranian Children ◽  
The Relationship

The aim of the present study was to evaluate the relationship between BMI and tooth decay in a population of Iranian children. In this cross-sectional descriptive/analytical study, 1482 children were selected from kindergartens and preschool centers in Kerman, Iran. The children underwent examination of deciduous teeth (using the dmft index) after determination of height and weight for calculation of BMI. The relationship between BMI (after adjustment for age) and dmft was determined using Poisson’s regression model. The mean of dmft in children with normal BMI was 1.5-fold that in subjects with extra body weight. Age had a significant effect on dmft. In addition, dmft was higher in boys compared to girls. The results of the present study showed that caries rate in the deciduous teeth of 3–6-year-old children decreases with an increase in body weight.

scholarly journals Determination of Q-convex sets by X-rays

2005 ◽  
Vol 332 (1-3) ◽  
pp. 19-45 ◽  
Author(s):  
Alain Daurat
Keyword(s):  
Convex Sets ◽  
X Rays

The Measurement of Elastic Constants for the Determination of Stresses by X-Rays

1984 ◽  
pp. 159-170 ◽  
Author(s):  
K. Perry ◽  
I. C. Noyan ◽  
P. J. Rudnik ◽  
J. B. Cohen
Keyword(s):  
Elastic Constants ◽  
X Rays
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