scholarly journals The prediction of impacted versus spontaneously erupted mandibular third molars

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Amanda Silva De Sousa ◽  
José Valladares - Neto ◽  
David Normando
Keyword(s):  
Kappa Statistics ◽  
X Rays ◽  
Third Molars ◽  
Accuracy Rate ◽  
Predictive Capacity ◽  
Chi Square ◽  
X Ray ◽  
Prognostic Accuracy ◽  
Chi Square Test ◽  
Mandibular Third Molars

Abstract Background To evaluate the predictive capacity of orthodontists and oral maxillofacial surgeons (OMFSs) in anticipating the process of impaction or eruption of lower third molars (L3Ms) through the examination of serial panoramic radiographs. Methods Sixty-eight lower third molars (L3Ms) were analyzed in 34 orthodontically treated patients without extraction. Twenty-seven OMFSs and 27 orthodontists were randomized in order to analyze the radiographs. Initially, the evaluators issued the prognosis for the L3Ms in XR1, a posterior for the XR1 + XR2. Concordance of the diagnosis was examined using Kappa statistics, and the differences between the groups of evaluators were examined using the chi-square test at p<0.05. Results When examining XR1 in cases where the teeth erupted spontaneously, the prognostic accuracy rate for OMFSs and orthodontists was similar, 63 and 65.7%, respectively (p=0.19). When evaluating XR1 + XR2, the accuracy among orthodontists (60%) was similar to that reported for XR1 (p=0.19), while OMFSs presented a reduction in the accuracy (55.3%, p<0.0001). When the L3Ms remained impacted, accuracy in XR1 was lower than in spontaneously erupting L3Ms, although similar between OMFSs (50.1%) and orthodontists (49.1%). Furthermore, for impacted L3Ms, when examining XR1 + XR2, the OMFSs presented a significant higher accuracy (71.8%, p <0.0001). Conclusions Orthodontists and OMFSs seem unable to predict spontaneous eruption or impaction of the lower third molars from single or longitudinal x-rays. When adding a second longitudinal x-ray, orthodontists and more significantly OMFSs tend to indicate more extractions.

scholarly journals Panoramic Radiographic Assessment of Agenesis of Mandibular Third Molars: A Hospital Based Study in Eastern Nepal

2019 ◽  
Vol 57 (217) ◽  
Author(s):  
Pragya Regmee ◽  
Jyotsna Rimal ◽  
Ichha Kumar Maharjan ◽  
Surya Raj Niraula
Keyword(s):  
Panoramic Radiograph ◽  
The Other ◽  
Third Molars ◽  
Radiographic Assessment ◽  
Review Committee ◽  
Oral Medicine ◽  
Chi Square ◽  
Institutional Review ◽  
Chi Square Test ◽  
Mandibular Third Molars

Introduction: Racial variation, genetic inheritance and various other factors can affect the jaw size and ultimately the tooth size and number. Studies for agenesis of mandibular third molars (M3s) have been carried out in various populations but data relating to these are not evident from most of the parts of Nepal. Hence, the objective of the present study is to determine the prevalence of agenesis among the population of patients visiting the Department of Oral Medicine and Radiology of this institute. The study also sought the odds of agenesis of M3 in one side when there was missing M3 on the other side of the mandible. Methods: This study was conducted after the approval from Institutional Review Committee of BPKIHS. Two hundred and eighty four patients (568 sites of M3, bilaterally), visiting the Department of Oral Medicine and Radiology were studied with Panoramic Radiograph to assess for agenesis of mandibular third molars, bilaterally. Percentage of agenesis was calculated and chi square test was applied where relevant. Odds ratio was also calculated. Results: Agenesis was seen in 28.7% of the participants. The Odds of M3 being missing on one side with concurrent missing M3 on the other side was 40.27 (Confidence Interval 19.34 to 83.87). Conclusions: Agenesis was highly prevalent in this study group. The likelihood of M3 being absent on one side, when there was concurrent missing M3 on the other side of mandible was also high.

184 EFFECTS OF X-RAY ELECTROMAGNETIC RADIATION ON BOVINE OOCYTE DEVELOPMENT

2010 ◽  
Vol 22 (1) ◽  
pp. 250
Author(s):  
W. E. Snyder ◽  
J. T. Aaltonen ◽  
H. D. Sigal ◽  
N. M. Loskutoff
Keyword(s):  
Electromagnetic Radiation ◽  
High Energy ◽  
X Rays ◽  
Embryo Production ◽  
Chi Square ◽  
X Ray ◽  
Chi Square Test ◽  
Bovine Oocytes ◽  
Experimental Group

This study examined the effects of X-rays on bovine oocytes used for in vitro embryo production. In recent years, airport security has become more stringent and the use of X-ray screening may be required for all items, which could be problematic when transporting oocytes. Ionizing radiation such as X-rays are high-energy particles that can penetrate into the nucleus of a cell and cause single and double-strand breaks in the DNA chain. Oocytes exposed to X-ray radiation may have DNA damage affecting maturation, fertilization, and embryonic development. Bovine ovaries obtained from a local abattoir were used to collect immature oocytes by follicular aspiration. The oocytes were divided into a control group and an experimental group then placed in maturation medium. The oocytes in the experimental group were placed in a hospital X-ray machine with a single exposure of 100 mA, 120 kVp for 0.3 s. This exposure challenged the oocytes with a comparable, calculated amount of mrems equivalent to a single screening from an airport X-ray machine (30 mrems). After X-ray exposure, the experimental group was cultured with the control at 37°C and 5% CO2. After 18 h, cryopreserved bovine sperm were thawed and processed using BoviPure (Nidacon International, Mölndal, Sweden) density gradient centrifugation and the oocytes were inseminated with 1 × 106 sperm in fertilization medium at 37°C and 5% CO2. After 24 h, both groups were transferred to 50-μL droplets of G1 medium (Vitrolife, Göteborg, Sweden) at 37°C and 6% CO2 and both were transferred into G2 medium after 72 h. Development of the oocytes was scored after an additional 72 h. Results were based on 2 criteria: the percent cleaved (presumptive fertilization) and the percent cleaved that developed to morula and blastocyst stages. The results indicated no significant difference in the percentages of oocytes cleaving after insemination for the control and experimental groups (P = 0.403, chi-square test). However, there was a significant increase (P = 0.037, chi-square test) in the percentages of morulae and blastocysts developing in the control (non-irradiated) v. experimental (X-rayed) groups. The outcome of this study cautions on the potential damage caused to bovine oocytes used for embryo production in vitro when exposed to X-ray electromagnetic radiation during routine air transport screening operations. Table 1.

scholarly journals Mandibular Third Molars and Lower Anterior Crowding: Comparison of Opinions of Oral-Maxillofacial Surgeons and Orthodontists

2019 ◽  
Vol 7 (4) ◽  
pp. 265-264
Author(s):  
Muhammad Azeem ◽  
Muhammad Mudassar Saleem ◽  
Sana Mehmood Qureshi ◽  
Arshad Mehmood ◽  
Muhammad Imran Khan ◽  
...  
Keyword(s):  
Statistical Significance ◽  
Third Molar ◽  
Descriptive Study ◽  
Third Molars ◽  
Online Questionnaire ◽  
Chi Square ◽  
Anterior Crowding ◽  
Chi Square Test ◽  
Mandibular Third Molars

Objective: To compare the opinion of orthodontists and oral-maxillofacial surgeons on relation between erupting mandibular third molars and lower incisal crowding.Patients and Methods: This descriptive study involved 100 Pakistani clinicians (50 orthodontists, 50 oral-maxillofacial surgeons) to answer online questionnaire regarding their opinions on link between erupting Mandibular Third Molars along with their extraction opinion with reference to development and prevention of lower incisal crowding. Data was analyzed using SPSS version 21.0. Pearson's chi-square test was applied and statistical significance was defined at <=0.05.Results: Statistically insignificant differences were found between oral-maxillofacial surgeons and orthodontists regarding question of erupting mandibular third molars in causing lower incisal crowding. Similarly, statistically insignificant differences between oral-maxillofacial surgeons and orthodontists were found regarding question of recommending preventive extraction of mandibular third molars for developing lower incisal crowding.Conclusion: No opinion differences were observed between Pakistani oral surgeons and orthodontists, regarding the link of lower third molar as a cause of lower incisal crowding.

Hubungan antara Luas Lesi pada Foto Toraks Penderita TB Paru Dewasa yang Memiliki Riwayat Diabetes Melitus dengan Indeks Massa Tubuh di Rumah Sakit Hasan Sadikin Bandung

2016 ◽  
Vol 1 (3) ◽  
pp. 138-144
Author(s):  
Ina Edwina ◽  
Rista D Soetikno ◽  
Irma H Hikmat
Keyword(s):  
Chest Radiograph ◽  
Chi Square ◽  
Pulmonary Tb ◽  
X Ray ◽  
Consecutive Sampling ◽  
Close Relationship ◽  
Chi Square Test ◽  
Chest X Ray ◽  
The Relationship ◽  
Diabetes Melitus

Background: Tuberculosis (TB) and diabetes mellitus (DM) prevalence rates are increasing rapidly, especially in developing countries like Indonesia. There is a relationship between TB and DM that are very prominent, which is the prevalence of pulmonary TB with DM increased by 20 times compared with pulmonary TB without diabetes. Chest X-ray picture of TB patients with DM is atypical lesion. However, there are contradictories of pulmonary TB lesion on chest radiograph of DM patients. Nutritional status has a close relationship with the morbidity of DM, as well as TB.Objectives: The purpose of this study was to determine the relationship between the lesions of TB on the chest radiograph of patients who su?er from DM with their Body Mass Index (BMI) in Hasan Sadikin Hospital Bandung.Material and Methods: The study was conducted in Department of Radiology RSHS Bandung between October 2014 - February 2015. We did a consecutive sampling of chest radiograph and IMT of DM patients with clinical diagnosis of TB, then the data was analysed by Chi Square test to determine the relationship between degree of lesions on chest radiograph of pulmonary TB on patients who have DM with their BMI.Results: The results showed that adult patients with active pulmonary TB with DM mostly in the range of age 51-70 years old, equal to 62.22%, with the highest gender in men, equal to 60%. Chest radiograph of TB in patients with DM are mostly seen in people who are obese, which is 40% and the vast majority of lesions are minimal lesions that is equal to 40%.Conclusions: There is a signifcant association between pulmonary TB lesion degree with BMI, with p = 0.03

scholarly journals Periodontal status of the second molar adjacent to the third mandibular molar

2020 ◽  
pp. 1-11
Author(s):  
Katherine Luzuriaga ◽  
Santiago López Jurado
Keyword(s):  
Bone Loss ◽  
X Rays ◽  
Third Molars ◽  
Periodontal Status ◽  
Second Molar ◽  
The Third ◽  
Probing Depth ◽  
Mandibular Molar ◽  
Mandibular Third Molars ◽  
Transversal Study

Third molars have an unusual eruption pattern. Studies suggest that, due to the position and angulation of these, various pathologies could occur in the adjacent molars, such as periodontal problems and the appearance of distal caries. The objective of this work is to describe the periodontal status of mandibular second molars adjacent to mandibular third molars. For this, a descriptive transversal study was carried out. We worked with a sample of 277 patients that went to the Dental UCSG Clinic to have their third molars extracted in the period A-2018. An intraoral clinical examination was performed, and the following variables were observed: probing depth, gingival state, and presence of caries in mandibular second molars. In addition, panoramic x-rays of the patients were reviewed to determine the position of the third mandibular molar and the level of the distal bone crest of the second molars. The results showed that the depth of distal probing of the mandibular second molars were normal (from 1 to 3mm) in 31% of the cases, while in 69% depths greater than 3mm were found. Regarding the presence of bone loss, in 43% of the cases there was no loss, in 35% of the cases there was a slight loss, 22% presented moderate loss and only 1% had severe loss. The presence of mandibular third molars significantly affects the periodontal status of the adjacent second molar, which can lead to periodontal pockets, bone los sand caries in their distal area.

Physician Compliance With Bronchiolitis Guidelines in Pediatric Emergency Departments

2019 ◽  
Vol 58 (9) ◽  
pp. 1008-1018 ◽  
Author(s):  
Andrea V. Rivera-Sepulveda ◽  
Terri Rebmann ◽  
James Gerard ◽  
Rachel L. Charney
Keyword(s):  
Online Survey ◽  
Pediatric Emergency ◽  
Systemic Steroid ◽  
X Rays ◽  
Chi Square ◽  
X Ray ◽  
American Academy Of Pediatrics ◽  
Physician Compliance ◽  
Chest X Ray ◽  
Viral Testing

An online survey was administered through the American Academy of Pediatrics (AAP) Section of Emergency Medicine Survey Listserv in Fall, 2017. Overall compliance was measured as never using chest X-rays, viral testing, bronchodilators, or systemic steroids. Practice compliance was measured as never using those modalities in a clinical vignette. Chi-square tests assessed differences in compliance between modalities. t tests assessed differences on agreement with each AAP statement. Multivariate logistic regression determined factors associated with overall compliance. Response rate was 47%. A third (35%) agreed with all 7 AAP statements. There was less compliance with ordering a bronchodilator compared with chest X-ray, viral testing, or systemic steroid. There was no association between compliance and either knowledge or agreement with the guideline. Physicians with institutional bronchiolitis guidelines were more likely to be practice compliant. Few physicians were compliant with the AAP bronchiolitis guideline, with bronchodilator misuse being most pronounced. Institutional bronchiolitis guidelines were associated with physician compliance.

scholarly journals A highly transmissible tuberculosis outbreak: the importance of bars

2017 ◽  
Vol 145 (16) ◽  
pp. 3497-3504 ◽  
Author(s):  
P. GODOY ◽  
M. ALSEDÀ ◽  
M. FALGUERA ◽  
T. PUIG ◽  
P. BACH ◽  
...  
Keyword(s):  
Latent Tuberculosis Infection ◽  
Linear Trend ◽  
Latent Tuberculosis ◽  
Skin Tests ◽  
X Rays ◽  
Dose Response Relationship ◽  
Chi Square ◽  
Social Events ◽  
Ltbi Prevalence ◽  
Chi Square Test

SUMMARYThe transmission of tuberculosis (TB) in bars is difficult to study. The objective was to describe a large TB outbreak in a company's bar and other leisure settings. A descriptive study of a TB outbreak was carried out. Contacts were studied in the index case's workplace bar (five circles of contacts) and other recreational areas (social network of three bars in the index case's neighbourhood). Chest X-rays were recommended to contacts with positive tuberculin skin tests (TST) (⩾5 mm). The risk of latent tuberculosis infection (LTBI) was determined using an adjusted odds ratio. The dose–response relationship was determined using the chi-square test for linear trend. We studied 316 contacts at the index case's workplace and detected five new cases of TB. The prevalence of LTBI was 57·9% (183/316) and was higher in the first circle, 96·0% (24/25), and lower in the fifth, 46·5% (20/43) (P < 0·0001). Among 58 contacts in the three neighbourhood bars, two TB cases were detected and the LTBI prevalence was 51·7% (30/58). Two children of one secondary TB company patient became ill. Bars may be transmission locations for TB and, as they are popular venues for social events, should be considered as potential areas of exposure.

scholarly journals The knowledge, attitude and practices of Turkish general dentists on dental x-rays in pregnant women

2019 ◽  
Vol 9 (1) ◽  
pp. 9-15
Author(s):  
Katibe Tuğçe Temur ◽  
İsa Temur ◽  
Ömer Hatipoğlu
Keyword(s):  
Pregnant Women ◽  
X Rays ◽  
Chi Square ◽  
Dental Procedures ◽  
Dental Practitioners ◽  
The Usa ◽  
Chi Square Test ◽  
Native Speakers Of English ◽  
General Dentists ◽  
Demographical Data

Aim: The purpose of this study was to evaluate the knowledge, attitude and practices of the general dental dentists working in Turkey on the dental x-rays in pregnant women; and to develop awareness for the purpose of not delaying their dental treatments. Methodology: The questionnaire that was used in the study was applied to 270 dental dentists who worked in Turkey in electronic medium. The questionnaire consisted of 2 sections each of which had 11 questions. In the first section, the demographical data were questioned. In the second section, there were questions to determine the knowledge, attitude and practices of the dentists on x-ray in pregnant women. The questionnaires that were completed were examined and analyzed statistically by using the results and the Chi-Square Test and the Chi-Square Test. Data analysis was performed by using Statistical Package for the Social Sciences version 23.0 (SPSS Inc., Chicago, IL, the USA). Results: A total of 71.1% of the dental practitioners who participated in the study stated that they did not request radiography from pregnant women. A total of 62.2% of the dental dentists stated that they preferred the 2nd Trimester for requesting radiography. A total of 38.9% of the general dentists who participated in the study stated that the diagnostic radiographies used in dentistry caused anomalies in the fetus, 18.9% stated that they did not have any information. Conclusion: Further training courses must be planned to increase and update the awareness of the dental dentists on the precautions and procedures for radiography practice in pregnant women; and brochures must be prepared for pregnant women to provide information about this subject. Also, dental dentists and obstetricians should work in agreement about dental procedures in pregnancy and diagnostic radiography in terms of its being safe when necessary.   How to cite this article: Temur KT, Temur İ, Hatipoğlu Ö.  The knowledge, attitude and practices of Turkish general dentists on dental x-rays in pregnant women. Int Dent Res 2019;9(1):9-15.    Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Esophageal Foreign Bodies in Pediatric Patients: A Thirteen-Year Retrospective Study

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Beata Rybojad ◽  
Grazyna Niedzielska ◽  
Artur Niedzielski ◽  
Ewa Rudnicka-Drozak ◽  
Pawel Rybojad
Keyword(s):  
Retrospective Study ◽  
Foreign Bodies ◽  
Pediatric Patients ◽  
Clinical Symptoms ◽  
X Rays ◽  
Chi Square ◽  
X Ray ◽  
Rigid Esophagoscopy ◽  
Plain Chest ◽  
Esophageal Foreign Bodies

We discuss clinical symptoms and radiological findings of variable esophageal foreign bodies as well as therapeutic procedures in Caucasian pediatric patients. A retrospective study of 192 cases of suspected esophageal foreign bodies between 1998 and 2010 was conducted. Data were statistically analyzed by chi-square test. A foreign body was removed from a digestive tract of 163 children aged 6 months to 15 years (mean age 4.9). Most objects were located within cricopharyngeal sphincter. Dysphagia occurred in 43%, followed by vomiting (29%) and drooling (28%). The most common objects were coins. Plain chest X-rays demonstrated aberrations in 132 cases, and in doubtful situations an esophagram test was ordered. In the group of thirty-seven patients whose radiograms were normal, esophagoscopy revealed fifteen more objects, which were eventually successfully removed. No major complications occurred. Esophagram should be a second X-ray examination if an object is not detected in plain chest X-ray. We recommend a rigid esophagoscopy under general anesthesia in doubtful cases as a safe treatment for pediatric patients.

scholarly journals Powerful Statistical Tests for Ordered Data

2020 ◽  
Author(s):  
Juergen Koefinger ◽  
Gerhard Hummer
Keyword(s):  
Statistical Tests ◽  
X Rays ◽  
Test Statistics ◽  
Chi Square ◽  
P Values ◽  
Gamma Distributions ◽  
Versatile Tool ◽  
Chi Square Test ◽  
Common Sign ◽  
Ordered Data

<p>The inference of models from one-dimensional ordered data subject to noise is a fundamental and ubiquitous task in the physical and life sciences. A prototypical example is the analysis of small- and wide-angle solution scattering experiments using x-rays (SAXS/WAXS) or neutrons (SANS). In such cases, it is common practice to check the quality of a fit by using Pearson's chi-square test, which ignores the order of the data. We usually plot the residuals and check visually for systematic deviations without quantifying them. To quantify these deviations, we developed test statistics based on the distributions of the lengths of the runs of the signs of the residuals. Specifically, we use the probability of run-length distributions, for which we provide analytical expressions, to rank them and to calculate their P-values. We introduce the Shannon information distribution as an elegant and versatile tool for calculating P-values. We find that these distributions follow shifted gamma distributions, such that they are summarized by three parameters only. We show for a set of six models that our test statistics are more powerful than Pearson's chi-square test and common sign-based tests. We provide an open source Python 3 implementation of our tests free of charge at https://github.com/bio-phys/hplusminus.</p>

Sign in / Sign up

Export Citation Format

Share Document