The intra- and inter-rater reproducibility of bone level measurements at strategic mini-implants using dental panoramic radiography

Abstract Objectives: This experimental study focused on the intra- and inter-rater reproducibility of vertical bone level (VBL) measurements at strategic mini-implants (MI) using digital panoramic radiographs (PR). Study design: VBLs of 152 MIs for removable partial denture stabilization at 50 randomly chosen PRs from a clinical trial were digitally evaluated by three ratters. Rater deviations exceeding 0.5 mm were re-examined. The intra-class correlation coefficient (ICC) was applied to estimate reliability. The smallest detectable change (SDC) was interrelated to the minimal clinically important change of 0.2 mm. Results: The first measurement round revealed intra- and inter-rater ICCs of > 0.8. However, 28 sites (9 %) were unreadable, and 97 sites (32 %) revealed differences between observers of ≥ 0.5 mm. Following a consensus session and re-training, an additional 8 sites were excluded and all remaining VBL differences were ≤ 0.5 mm. Thus, the SDCs with 95 % credibility were improved from 0.73 to 0.31 mm in the intra-rater and from 1.52 to 0.34 mm in the interrater statistics. Given a 50 % credibility for this special setting, both the intra- and inter-rater SDCs were 0.11 mm. Conclusions: Digital PR can be reliably utilized to determine VBLs around MIs under conditions of at least two trained observers, mutual calibration sessions, and exclusion of unquantifiable radiographs. German Clinical Trials Register ID:DRKS00007589, www.germanctr.de

Sex Determination in the Contemporary Chilean Population by Mandible Analysis in Panoramic Radiographies / Estimación Sexual de la Población Chilena Contemporánea Mediante Análisis de la Mandíbula en Radiografías Panorámicas

SUMMARY: Sex identification of a deceased human individual by means of the mandible is very important for forensic dentistry. The aim of the present study was to determine the sex of Chilean individuals by mandible analysis in panoramic radiographies. Linear and angular parameters of the mandible were analyzed from panoramic radiographies (PR). The study included PR of adult Chilean individuals, of both sexes, with optimum solution and contrast, and which allowed the angles and rami of the mandible to be viewed. Sex was determined by univariate and bivariate discriminant function analysis. The sample consisted of 594 PR of individuals aged between 18 and 84 years. The best sex predictor using univariate discriminant function analysis was the mandibular ramus height (MRH) (74.1 %), followed by the distance from the mental foramen - mandibular base (DMF-MB) (69.1 %) and the bicondylar breadth (BC) (66.7 %). The parameters that presented the lowest sex prediction were the angle of the mandible (AM) with 55.0 % and the distance between mental foramina (DMF) with 53.7 %. The best sex prediction was obtained by the step model of discriminant function analysis (80.2 %), including only three parameters: MRH, BC and DMF-MB. The parameters height of the mandibular ramus, bicondylar breadth and distance from the mental foramen - base of the mandible are good predictors of sex in Chilean individuals when used in conjunction; they are therefore indicated for sex determination in the contemporary Chilean population.

La identificación humana de un individuo fallecido a través de la mandíbula es muy relevante para la odontología forense. El objetivo de este estudio fue estimar el sexo de individuos Chilenos a través del análisis de la mandíbula, utilizando radiografías panorámicas. Fueron analizados parámetros lineales y angulares de la mandíbula, a través de radiografías panorámicas (RP). Se incluyeron RP de individuos chilenos adultos, ambos sexos, con solución y contraste óptimos, y que permitían la visualización de los ángulos y ramas de la mandíbula. Se realizó análisis por función discriminante univariada y bivariada para estimación del sexo. Fueron incluidas 594 RP de individuos entre 18 y 84 años. Para el análisis de función discriminante univariado, la altura de la rama mandibular (ARM) fue el parámetro más predictivo (74,1 %), seguido de la distancia foramen mentoniano - base de la mandíbula (DFM-BM) (69,1 %) y el ancho bicondilar (ABCo) (66,7 %). Los parámetros que presentaron menor predicción sexual fueron el ángulo de la mandíbula (AM) con un 55,0 % y la distancia inter-forámenes mentonianos (DIFM), con el 53.7 %. El análisis por pasos fue el modelo de análisis de función discriminante que presentó la mayor predicción sexual (79,5 %), en el cual fueron incluidos sólo tres parámetros: ARM, ABCo y DFM-BM. Los parámetros altura de la rama de la mandíbula, ancho bicondilar y distancia desde el foramen mentoniano hasta la base de la mandíbula son buenos predictores del sexo en individuos Chilenos cuando utilizados en conjunto y están indicados para estimar el sexo en la población chilena contemporánea.

Age estimation of Russian individuals by teeth using the London Atlas / Análise da estimativa de idade em indivíduos russos utilizando a metodologia London Atlas

Knowing an individual's age is necessary for several situations, both in the living and the deceased. The London Atlas uses dental development and eruption to estimate age. Testing the method in different populations is necessary to assess its performance. This study aimed to assess the performance of the London Atlas method in a Russian sample using panoramic radiographs. A sample of 703 panoramic radiographs of Russian individuals (n = 405 females, 57.61% and n = 298 males, 42.39%) with ages between 8 and 23 years were analyzed. The results showed overestimation in individuals from 8 to 14 years and underestimation from 15 to 23 years. The mean difference between estimated and chronological ages did not exceed 0.7 years among individuals with ages below 19 years. The difference increased to over three years in individuals from 20 to 23 years. Statistically significant differences were found between females and males between 17 and 18 years (p<0.05). The London Atlas is suitable for Russian children and adolescents aged between 8 and 19 years; however, it showed unsatisfactory results for application in individuals over 20 years (AU).

Conhecer a idade de um indivíduo, vivo ou morto, é essencial em diversas situações. O método London Atlas utiliza desenvolvimento e erupção dentais para estimar a idade. Testar o método em diferentes populações é importante para avaliar sua performance. Esse estudo objetivou analisar o desempenho do London Atlas em uma amostra de origem russa, utilizando radiografias panorâmicas. Uma amostra de 703 indivíduos russos (n = 405 mulheres, 57,61% e n = 298 homens, 42,39%), com idades entre 8 e 23 anos foram analisadas. Resultados obtidos mostram uma superestimação em indivíduos de 8 a 14 anos e subestimação nos grupos de 15 a 23 anos. A diferença média entre idades estimadas e reais não excederam o valor de 0,7 anos nos indivíduos com idade abaixo de 19 anos. Essa diferença aumentou em até três anos em indivíduos de 20 a 23 anos. Diferenças estatisticamente significantes foram encontradas entre homens e mulheres com 17 e 18 anos (p<0,05). O London Atlas é adequado para crianças e adolescentes de origem russa, com idades de 8 a 19 anos. No entanto, observou-se resultados insatisfatórios para sua aplicação em indivíduos acima de 20 anos (AU).

Effects of early unilateral mandibular first molar extraction on condylar and ramal asymmetry / Efectos de la extracción temprana del primer molar mandibular unilateral sobre la asimetría condilar y ramal

SUMMARY: Craniofacial symmetry is an important factor in creating a harmonious facial appearance. Genetic and external factors may cause the formation of mandibular asymmetry. The aim of this study was to evaluate vertical mandibular asymmetries in adolescents who had unilateral mandibular first permanent molar (FPM) teeth extracted at an early age. The study group consisted of 60 subjects (30 females, 30 males with a mean age of 16.18±1.04 years) who had their mandibular permanent first molar tooth extracted before the age of 12, and the control group consisted of 60 healthy subjects (30 females, 30 males with a mean age of 16.23±0.92 years). Condylar asymmetry index (CAI), ramal asymmetry index (RAI), and condylar-ramal asymmetry index (CRAI) were calculated using panoramic radiographs of the subjects. Independent samples t-test was used to evaluate the differences between groups. CAI, RAI, and CRAI values were similar between male and female subjects in both control and study groups, and no statistically significant difference was found (p>0.05). No statistically significant difference was observed between the group who had their mandibular first permanent molar teeth extracted at an early age and the control group (p>0.05). CAI values were relatively higher in both groups, but there was no significant difference between the CAI, RAI, and CRAI values between the groups.

La simetría craneofacial es un factor importante para crear una apariencia facial armoniosa. Factores genéticos y externos pueden causar la formación de asimetría mandibular. El objetivo de este estudio fue evaluar las asimetrías mandibulares verticales en adolescentes a quienes se les extrajo el primer molar permanente (FPM) mandibular unilateral a una edad temprana. El grupo de estudio consistió en 60 sujetos (30 mujeres, 30 hombres con una edad media de 16,18±1,04 años) a quienes se les extrajo el primer molar mandibular permanente antes de los 12 años, y el grupo control consistió en 60 sujetos sanos (30 mujeres, 30 hombres con una edad media de 16,23±0,92 años). El índice de asimetría condilar (CAI), el índice de asimetría ramal (RAI) y el índice de asimetría condilar-ramal (CRAI) se calcularon utilizando radiografías panorámicas de los sujetos. Se utilizó la prueba t de muestras independientes para evaluar las diferencias entre los grupos. Los valores de CAI, RAI y CRAI fueron similares entre los hombres y las mujeres tanto en el grupo control como en el de estudio, y no se encontraron diferencias estadísticamente significativas (p>0.05). No se observaron diferencias estadísticamente significativas entre el grupo al que se le extrajo el primer molar permanente mandibular a una edad temprana y el grupo control (p>0,05). Los valores de CAI fueron relativamente más altos en ambos grupos, pero no hubo diferencias significativas entre los valores de CAI, RAI y CRAI entre los grupos.

Frecuencia de la cavidad ósea de Stafne. Un análisis retrospectivo en radiografías panorámicas / Frequency of Stafne's bone cavity. A retrospective analysis in panoramic radiographs

Introducción: La cavidad ósea de Stafne es una variante anatómica poco frecuente, radiolúcida y bien delimitada, que usualmente se presenta en la región molar cerca del ángulo mandibular y por debajo del canal para el nervio dentario inferior. Es frecuente que sea erróneamente diagnosticada con otras entidades de carácter patológico. Objetivo: Determinar la frecuencia de la cavidad ósea de Stafne en las radiografías panorámicas del Servicio de Radiología Oral y Maxilofacial del Centro Dental Docente "Cayetano Heredia", desde 2015 hasta 2019. Métodos: Se realizó un estudio observacional, descriptivo, transversal y retrospectivo de una muestra de 17875 radiografías panorámicas. Se consideraron las variables demográficas como el sexo, la edad, la localización y la forma, posteriormente se realizaron tablas de contenido para el análisis de los datos. Resultados: Entre los 17875 pacientes, solo 24 (0,13 por ciento) presentaban cavidad ósea de Stafne, incluidos 16 hombres y 8 mujeres. La octava década de vida presentó la mayor cantidad de casos con 6 (0,4 por ciento). La localización posterior derecha contó con 13 (54,17 por ciento), la posterior izquierda con 7 (29,17 por ciento) y la anterior con 4 (16,67 por ciento). La forma ovalada con 23 (95,83 por ciento) y la redonda solo con 1 (4,17 por ciento). Conclusiones: La frecuencia de la cavidad ósea de Stafne fue de 0,13 por ciento con predilección del sexo masculino, la octava década de vida, la localización posterior derecha y la forma ovalada(AU)

Introduction: Stafne's bone cavity is a rare, radiolucent, well-demarcated anatomic variant that usually occurs in the molar region near the mandibular angle and below the canal for the inferior dental nerve. It is frequently misdiagnosed with other pathological entities. Objective: To determine the frequency of Stafne's bone cavity in panoramic radiographs of the Oral and Maxillofacial Radiology Service of the Teaching Dental Care Center "Cayetano Heredia", from 2015 to 2019. Methods: An observational, descriptive, cross-sectional and retrospective study was performed on a sample of 17875 panoramic radiographs. Demographic variables such as gender, age, location and shape were considered; subsequently tables of contents were performed for data analysis. Results: Among the 17875 patients, only 24 (0.13 percent) had Stafne's bone cavity, including 16 males and 8 females. The eighth decade of life presented the highest number of cases with 6 (0.4 percent). The right posterior location accounted for 13 (54.17 percent), the left posterior with 7 (29.17 percent) and the anterior with 4 (16.67 percent). The oval shape with 23 (95.83 percent) and round with only 1 (4.17 percent). Conclusions: The frequency of Stafne's bone cavity was 0.13 percent with male sex predilection, eighth decade of life, right posterior location and oval shape(AU)

Comparison of panoramic radiography and cone-beam computed tomography images for detecting external root resorption of mandibular second molar associated with third molar impaction / 口腔医学

Objective@# To compare the diagnostic performance between panoramic radiography(PR)and cone beam computed tomography(CBCT)in the assessment of external root resorption(ERR)of mandibular second molars associated with impacted third molars. @*Methods@# A total number of 832 patients with 1 074 mesially and horizontally impacted mandibular third molars treated at our institution from January 2019 to December 2020 were retrospectively analyzed. Presence of ERR on the adjacent second molar was investigated with PR and CBCT. Factors affecting the diagnostic accuracy of PR were determined. @*Results@# The overall incidence of ERR in second molars was 33.15%(356/1 074)as detected by CBCT images. The accuracy of PR was 66.39%. Multivariate Logistic regression analyses further revealed that middle and Class Ⅲ impaction, crown contact or overlap with the root of adjacent tooth were risk factors for inaccurate diagnosis of PR(P<0.05). @*Conclusion@#The accuracy of detection on ERR of mandibular second molar associated with impacted third molar using panoramic radiography is lower. CBCT is recommended for this clinical scenario.

Prevalência de radiolucência justa-apical e sua relação com terceiros molares inferiores em radiografias panorâmicas / Prevalence of juxta-apical radiolucency and association/relations with the lower third molar in panoramic radiography

Objetivo: Avaliar a prevalência da radiolucência justa-apical (RJA) e sua relação com os terceiros molares inferiores, em 1054 radiografias panorâmicas. Métodos: A amostra foi constituída por radiografias panorâmicas digitais de indivíduos maiores de 18 anos, com pelo menos um terceiro molar inferior. As imagens foram analisadas para a presença de RJA em relação à corticalização, localização, relação com o canal mandibular, angulação e profundidade de impactação do terceiro molar. Os dados foram analisados através de estatística descritiva e pelo teste Qui-quadrado, sendo que valores de p < 0,05 foram considerados como significativos. Resultados:Foi encontrada uma prevalência de 2,75% de RJA, sendo predominante no sexo feminino (p = 0,01). A RJA foi visualizada em maior número corticalizada (58,63%), lateroapical (48,27%), em dentes parcialmente intraósseo (68,97%) e mesioangulados (55,17%). Em relação ao canal mandibular, houve maior prevalência na posição sobreposta ao canal mandibular (65,52%). Conclusão: A prevalência de RJA foi de 2,75% do total de 1054 radiografias panorâmicas avaliadas. Em relação ao canal mandibular, apresentou maior prevalência sobreposto. Além disso, a maior parte das RJA se apresentaram corticalizadas, em posição lateroapical, associada a dentes em posição mesioangular. Descritores: Radiografia panorâmica. Dente serotino. Nervo mandibular.Prevalência de radiolucência justa-apical e sua relação com terceiros molares inferiores em radiografias panorâmicas

Aim: To evaluate the prevalence of juxta-apical radiolucency (JAR) and its relationship with the lower third molars and adjacent structures, in 1,054 panoramic radiographs. Methods: The sample consisted of digital panoramic radiographs of individuals over 18 years of age, with at least one lower third molar. The images were analyzed for the presence of JAR in relation to corticalization, location, impaction depth, relationship with the mandibular canal, angulation, and impaction of the third molar. Data were analyzed using descriptive statistics and the chi-square test, and values of p < 0.05 were considered significant.Results: A prevalence of 2.75% of JAR was found, with a statistical difference between JAR and gender (p = 0.01), which proved to be predominant in females. The JAR was seen in greater numbers as corticalized (58.63%), lateroapical (48.27%), and mesioangulated (55.17%), as well as in erupted teeth (31.03%). In relation to the mandibular canal, it presented a higher prevalence when superimposed upon the mandibular canal (65.52%). Conclusions:The prevalence of RJA was 2.75% of the 1,054 evaluated panoramic radiographs. In relation to the mandibular canal, it presented a higher prevalence of superimposition. In addition, most of the RJA were corticalized, in a lateroapical position, associated with teeth in a mesioangular position. Uniterms: Panoramic radiography. Third molar. Mandibular nerve.

Confiabilidade da classificação de nash & moe em pacientes com escoliose idiopática do adolescente / Confiabilidad del método de nash & moe en pacientes con escoliose idiopática del adolescente / Reliability nash and moe s grades in patients with adolescent idiopathic scoliosis

ABSTRACT: Objective: Evaluate the inter and intra-observer reliability of Nash and Moe's grades, used to assess patients diagnosed with Adolescent Idiopathic Scoliosis (AIS). Methodology: Forty-seven representative x-rays of patients with AIS were randomly selected to evaluate the apical vertebral rotation (AVR) using Nash and Moe's grades. The evaluation of the AVR was made independently in two distinct moments by two observers. The inclusion criteria in the study were a patient diagnosed with AIS and an orthostasis radiography with a good-quality image. An agreement study between the evaluations and the inter and intraobserver's reliability was determined using Kappa's statistics with a confidence interval of 95%. Results: The interobservers' Kappa's value in the first evaluation was 0,44 (CI 95%; 0,22-0,66) and 0,37 (CI 95%; 0,17-0,56) in the second. In the intraobservers' evaluations, the Kappa's value for examiner 1 was 0,61 (CI 95%; 0,40-0,81) and 0,46 (CI 95%; 0,22-0,70) for examiner 2. Conclusion: This study's results demonstrated that Nash and Moe's grades are unreliable for evaluating vertebral rotation in patients with AIS. Level of Evidence III; A Cross-Sectional Study.

RESUMO: Objetivo: Avaliar a confiabilidade inter e intraobservador da classificação de Nash & Moe, usada em pacientes diagnosticados com escoliose idiopática do adolescente (EIA). Metodologia: Quarenta e sete radiografias representativas de pacientes com EIA foram selecionadas aleatoriamente para avaliação da rotação da vértebra apical (RVA), usando a classificação de Nash & Moe. A avaliação do RVA foi realizada de forma independente em dois momentos distintos, por dois examinadores. Os critérios de inclusão no estudo foram: paciente com diagnóstico de EIA e radiografia realizada em ortostase, com imagem de boa qualidade. Foi realizado um estudo de concordância entre as avaliações, e a confiabilidade inter e intraobservador foi calculada utilizando a estatística de Kappa com intervalo de confiança (IC) de 95%. Resultados: O valor de Kappa interobservador na primeira avaliação foi de 0,44 (IC 95% de 0,22-0,66) e na segunda de 0,37 (IC 95% de 0,17 -0,56). Nas avaliações intraobservadores, o valor de Kappa para o examinador 1 foi de 0,61 (IC 95% de 0,40-0,81) e para o examinador 2 foi de 0,46 (IC 95% de 0,22-0,70). Conclusão: Os resultados deste estudo demonstraram que a classificação de Nash & Moe apresenta baixa confiabilidade na avaliação do grau de rotação vertebral em pacientes com EIA. Nível de Evidência III; Estudo Transversal.

RESUMEN: Objetivo: Evaluar la confiabilidad inter e intraobservador para la clasificación de Nash & Moe, usada para estudiar pacientes diagnosticados con Escoliosis Idiopática del Adolescente (EIA). Metodología: Cuarenta y siete radiografías representativas de pacientes con EIA fueron seleccionadas aleatoriamente para evaluación de la rotación de la vértebra apical (RVA) usando la clasificación de Nash & Moe. La evaluación fue hecha de modo independiente en dos momentos distintos, por dos evaluadores. Los criterios de inclusión en el estudio fueron: paciente con diagnóstico de EIA y radiografía realizada en ortostasis, con buena calidad de imagen. Se realizó un estudio de concordancia entre las evaluaciones y se calculó la fiabilidad interobservador e intraobservador mediante la estadística de Kappa con un intervalo de confianza (IC) del 95%. Resultados: El valor Kappa interobservador en la primera evaluación fue de 0,44 (IC 95%: 0,22-0,66) y en la segunda de 0,37 (IC 95%: 0,17 -0,56). En las evaluaciones intraobservador, el valor Kappa para el examinador 1 fue de 0,61 (IC 95%: 0,40-0,81) y para el examinador 2 fue de 0,46 (IC 95%: 0,22-0,70). Conclusión: Los resultados de este estudio demostraron que la clasificación de Nash & Moe tiene una baja fiabilidad para evaluar el grado de rotación vertebral en pacientes con EIA. Nivel de Evidencia III; Estudio Transversal.

Relación entre el diagnóstico histopatológico de sacos foliculares de terceros molares y la medida radiográfca estandarizada en radiografía panorámica digital / Relationship between histopathologic diagnosis of third molar follicular sacs and standardized radiographic measurement on digital panoramic radiography

Objetivo: establecer la relación entre el diagnóstico histopatológico de sacos foliculares de terceros molares y la medida radiográfca estandarizada en radiografía panorámica digital. Métodos: se llevó a cabo un estudio descriptivo en el que se incluyeron 28 sacos foliculares de terceros molares. Dos observadores midieron la radiolucidez pericoronal en radiografías panorámicas digitales usando un método estandarizado y se calculó el índice de correlación intraclase. Se estableció un diagnóstico radiográfco según la medida del saco, con <2.5 mm como el límite para sacos foliculares normales. Dicho diagnóstico fue comparado con el respectivo diagnóstico histopatológico. Se calculó sensibilidad y especifcidad; se aplicó la prueba de chi-cuadrado, exacta de Fisher y, fnalmente, el índice Kappa. Resultados: se obtuvo un alto grado de acuerdo entre los observadores. La prueba radiográfca tuvo una baja sensibilidad (0.27) y especifcidad (0.6) y no se encontró diferencia estadísticamente signifcativa entre estos. Conclusiones: la ausencia de hallazgos radiográfcos no implica ausencia de enfermedad. Además, no se puede establecer relación entre la presencia de quistes dentígeros y radiolucidez ≥ 2.5 mm en radiografía panorámica digital.

Objective: To establish the relationship between the histopathological diagnosis of follicular sacs of third molars and the standardized radiographic measurement in digital panoramic radiography. Methods: This was a descriptive study in which 28 follicular sacs of third molars were included. In digital panoramic radiographs two observers measured the pericoronal radiolucency using a standardized method and the intraclass correlation index was calculated. A radiographic diagnosis was established according to the size of the sac, with <2.5mm being the limit for normal follicular sacs. This diagnosis was compared with the respective histopathological diagnosis. Sensitivity and specifcity were calculated; the chi-square test, Fisher's exact test and fnally the Kappa index were applied. Results: A high degree of agreement was obtained among the observers. The radiographic test had a low sensitivity (0.27) and specifcity (0.6) and no statistically signifcant diference was found between these. Conclusions: The absence of radiographic fndings does not imply absence of disease, furthermore, no relationship can be established between the presence of dentigerous cysts and radiolucency ≥ 2.5 mm in digital panoramic radiography.

Does the use of panoramic radiography add information in the temporomandibular joint evaluation in Juvenile Idiopathic Arthritis patients? A case control study

Abstract Objective To determine the frequency of radiographic changes in the temporomandibular joint, in a representative population of patients with Juvenile Idiopathic Arthritis (JIA) and to compare with findings in healthy controls matched by sex and age. Patients and Methods One hundred and thirty-seven panoramic radiographies (PR) from JIA patients of a pediatric rheumatology outpatient clinic were prospectively evaluated and compared to 137 PR from healthy individuals. Results 102 (74.5%) JIA patients and 47 (34.3%) controls showed at least one radiological alteration (p < 0.001). The following radiographic alterations were more frequently observed in JIA patients than in controls: erosion (p < 0.001), altered condylar morphology (p < 0.001), disproportion between condylar process and the coronoid process (p < 0.001) and accentuated curve in the antegonial notch (p = 0.002). Twenty patients (14.6%) presented the four radiographic alterations simultaneously compared to only two controls (1.5%) (p < 0.001). Conclusion Due to the difference in the frequency of findings in the PR of patients and controls, we concluded that PR has value as a screening tool. In the presence of major changes in the mandible head in the PR of patients with a confirmed diagnosis of JIA, MRI should be considered to detect an active inflammatory process in this joint.

Clinical effect of a door shaped individualized dental archwire on the treatment of maxillary transposed canines / 口腔疾病防治

Objective @#To discuss the effectiveness and mechanism for movement of maxillary buccally transposed canines by using a door-shaped individualized dental archwire mechanic and to provide a reference for clinicians.@*Methods@#Eight patients with unilateral maxillary transposed canines were enrolled. All patients were treated with door-shaped individualized archwires. Before treatment (T1) and after the crowns of the transposed canines were moved to the right buccal positions in the dental arch during the treatment (T2), orthopantomograms were taken both at T1 and T2 to compare the linear changes (distance changes of the crown and root apex) and angular changes to study the mechanisms of tooth movement. The probing depth and buccal crown height were measured using a periodontal probe to compare periodontal changes before treatment (T1) and after treatment (T3) between the transposed canines and contralateral canines. @*Results@# All eight transposed canines were successfully brought back to their normal dental arch position but were made more buccal by using the door-shaped individualized dental archwire, with a mean of (11.5 ± 2.7) months. The average overall duration was (28.3 ± 4.7) months. The crown distance changes of the canines from T1 to T2 (8.1 mm) were greater than those of the root apexes (1.5 mm) (P<0.05). The mean angulation changes of the long axes of the canines were 17.5°. There was no significant difference in the depth of periodontal measurement and buccal crown height measurement between T1 and T3 (P>0.05). @*Conclusion @# The buccal movement of maxillary transposed canines under a door-shaped individualized dental archwire was effective and feasible. The movement pattern under this mechanism was controlled tipping.

Analysis of the influence of probe position on quality control test results of dental panoramic radiography equipment / 中国辐射卫生

Objective To quantitatively study the influence of changes in probe position on the quality control test results of dental panoramic radiography and to provide a reference for analyzing the sources of deviations in quality control test results. Methods Eight different models of dental panoramic X-ray machines were selected for this study. The film analysis method was used to determine the position of the central axis of the main beam on the image detector. The position of the probe was accurately controlled through an auxiliary moving device. The tube voltage, radiation output, and half-value layer of the useful beam were measured for positions at the center of the beam; 1 cm upward, downward, left, and right from the center of the beam; and 2 cm upward, downward, left, and right from the center of the beam. Results The tube voltage, radiation output, and half-value layer had a maximum value at the center of the beam, with a decrease in the value as the position deviated from the center. There were significant differences in the probe position sensitivity between different models of dental panoramic radiography equipment. A 2 cm deviation in the probe position resulted in an impact on the measured tube voltage of less than 5.3 kV (5.8%) for less sensitive equipment. A 2 mm deviation in the probe position resulted in an impact on the measured tube voltage of less than 5.4 kV (6.0%) for sensitive equipment. Conclusion The probe position can lead to deviation in the quality control test results of dental panoramic photography. Therefore, determining the position of the central axis of the main beam on the image detector for accurate positioning of the probe is crucial for quality control testing.

Morphology of Mandibular Condyle in The Population of Sarawak: A Retrospective Cross-sectional Study Using Digital Panoramic Radiograph

@#Introduction: The morphology of the condyles changes naturally with age, gender, face type, occlusal force, functional load, malocclusion type, and the right and left sides. Although condylar shape and size differ throughout populations, there have been few investigations on condylar morphology, particularly in the Malaysian population. Methods: This retrospective, observational, cross-sectional survey was conducted at the Oral and Maxillofacial Surgery Clinic of Sarawak General Hospital from September 2021 to March 2022, involving radiographic assessment of condylar morphology from 893 panoramic radiographs. Age, gender, ethnicity and dentition status using Eichner index were extracted from the data. Descriptive statistics were used. Pearson’s chi-square test was used to determine the association between the independent variables (age, gender, ethnicity and dentition status) and the shape of the mandibular condyle. A p-value of < 0.05 was considered statistically significant. Results: Only 450 panoramic radiographs were included in this study. The condyles were outlined and grouped into four categories, namely pointed (40.2%), round (32.8), angled (18.8), and flat (8.2%). Condylar morphology was found to be significantly associated with gender (p<0.005) and insignificant with other independent variables. Conclusion: The findings suggest that the most prevalent condylar morphology among the Sarawak population is the pointed shape, in contrast with other previous studies that reported the round shape condylar morphology as the majority shape.

Impact of different evaluation methods for diagnostic tasks in panoramic radiography / Impacto de diferentes métodos de evaluación durante el diagnóstico en la radiografía panorámica

Abstract The aim of this study was to evaluate the observers diagnostic performance in panoramic radiography using monitor, tablet, X-ray image view box, and against window daylight as a visualization method in different diagnostic tasks. Thirty panoramic radiography were assessed by three calibrated observers for each visualization method, in standardized light conditions, concerning dental caries, widened periodontal ligament space, and periapical bone defects from the four first molars; mucosal thickening and retention cysts in maxillary sinus; and stylo-hyoid ligament calcification and atheroma. A five-point confidence scale was used. The standard-reference was performed by two experienced observers. Diagnostic values using window light were significantly lower for caries and periapical bone defect and retention cyst, stylo-hyoid ligament calcification detection (p<0.05). For atheroma detection, X-ray image view box, tablet, and widow light had lower accuracy than the evaluation on the monitor (p<0.05). Observers diagnostic performances are worsened using window light as an evaluation method for panoramic radiography for dental, sinus, and calcification disorders, while the monitor was the most reliable method.

Resumen El objetivo de este estudio fue evaluar el desempeño diagnóstico de los observadores en la radiografía panorámica utilizando monitor, tablet, caja de visualización de imágenes de rayos X y contra la luz del día de la ventana como método de visualización en diferentes tareas de diagnóstico. Treinta radiografías panorámicas fueron evaluadas por tres observadores calibrados para cada método de visualización, en condiciones de luz estandarizadas, con respecto a caries dental, espacio del ligamento periodontal ensanchado y defectos óseos periapicales de los cuatro primeros molares; engrosamiento de la mucosa y quistes de retención en el seno maxilar; y calcificación y ateroma del ligamento estilohioideo. Se utilizó una escala de confianza de cinco puntos. La referencia estándar fue realizada por dos observadores experimentados. Los valores diagnósticos con luz de ventana fueron significativamente menores para caries y defecto óseo periapical y quiste de retención, detección de calcificación del ligamento estilohioideo (p <0.05). Para la detección de ateroma, la caja de visualización de imágenes de rayos X, el tablet y la luz de viuda tuvieron una precisión menor que la evaluación en el monitor (p <0.05). El rendimiento diagnóstico del observador empeora al utilizar la luz de la ventana como método de evaluación de la radiografía panorámica para los trastornos dentales, de los senos nasales y de la calcificación, mientras que el monitor fue el método más fiable.

Evaluación del canino maxilar permanente en niños entre 8 y 11 años en radiografía panorámica

RESUMEN: El canino maxilar permanente (CMP) es el segundo diente con mayor frecuencia de impactación debido a su largo descenso intraóseo y cronología de erupción. El objetivo de este estudio fue evaluar el grado de desarrollo dentario y posición del CMP entre los 8 años y los 11 años 11 meses con el fin de sugerir una edad cronológica óptima para su evaluación temprana en radiografía panorámica. Se realizó un estudio retrospectivo, en donde se analizaron 239 radiografías panorámicas de niños de 8 a 11 años. Éstas se agruparon según edad, género y área apical; luego se analizó el grado de desarrollo dentario y posición del vértice CMP izquierdo. En los resultados se observó que no existen diferencias significativas de la posición del CMP respecto a la edad cronológica. Además, entre los ocho años seis meses y nueve años seis meses un 61% de los caninos tuvieron más de la mitad de formación radicular. En conclusión, la evaluación temprana con radiografía panorámica del CMP se sugiere desde los ocho años seis meses a los nueve años seis meses, para alertar al clínico en casos donde el trayecto eruptivo se encuentre desviado.

ABSTRACT: The permanent maxillary canine (PMC) is the second most frequently impacted tooth due to its long intraosseous descent and eruption chronology. The objective of this study was to evaluate the degree of dental development and position of the PMC between the ages of 8 and 11 years 11 months in order to suggest an optimal chronological age for their early evaluation in panoramic radiography. A retrospective study was carried out, where 239 panoramic radiographs of children aged 8 to 11 years were analyzed. They were grouped according to age, gender and apical area; Then, the degree of dental development and position of the left PMC apex were analyzed. The results show that there are no significant differences in the position of the PMC with respect to chronological age. Furthermore, between eight years six months and nine years six months, 61% of the canines had more than half of the root formed. In conclusion, the early evaluation with panoramic radiography of the PMC is suggested from eight years six months to nine years six months, to alert the clinician in cases where the eruptive path is deviated.

Evaluación del taurodontismo en radiografías panorámicas en una población peruana / Evaluation of taurodontism in panoramic radiographies in a Peruvian population

RESUMEN El taurodontismo es una alteración en la morfología dentaria, la cual tiene implicancias clínicas en diferentes áreas de la odontología. Objetivo: Evaluar el taurodontismo en radiografías panorámicas en una población peruana. Material y métodos: Se evaluaron 220 radiografías panorámicas digitales en las que se clasificó el tipo de taurodontismo en primeros molares permanentes según el método de Shifman y Chanannel. Las observaciones fueron registradas en una ficha de datos. Resultados: El 51% pertenecieron al sexo masculino y el 49 % al femenino. La frecuencia de taurodontismo según sexo, fue mayor en hombres en 24%, y en mujeres fue 20%. El tipo de taurodontismo más frecuente fue el hipotaurodontismo en un 80%. La localización y la primera molar más frecuente fue el maxilar superior con un 68% y la molar superior izquierda con un 37%, respectivamente. Conclusión: La evaluación de taurodontismo en radiografías panorámicas digitales se caracterizó por ser más frecuente en hombres, en cuanto al tipo y localización resultó ser más frecuente el hipotaurodontismo y maxilar superior respectivamente. Además, se caracterizó por ser más frecuente en los primeros molares superiores del lado izquierdo.

ABSTRACT Taurodontism is a dental anomaly, so it has clinical implications in different areas of dentistry. Objective: To evaluate taurodontism in panoramic radiographs in a Peruvian population. Material and methods: 220 digital panoramic radiographs were evaluated in which the type of taurodontism was classified in permanent first molars according to the Shifman and Chanannel method. Observations were recorded on a data sheet. Results: 51% belonged to males and 49% to females. The frequency of taurodontism, according to sex, was higher in men in 24%, and in women it was 20%. The most frequent type of taurodontism was hypotaurodontism in 80%. The most frequent location and first molar was the upper jaw with 68% and the upper left molar with 37%, respectively. Conclusion: The evaluation of taurodontism in digital panoramic radiographs was characterized by being more frequent in men, in terms of type and location, hypotaurodontism and maxilla, respectively, were more frequent. Furthermore, it was characterized by being more frequent in the upper first molars on the left side.

Use of the Demirjian method to estimate dental age in panoramic radiographs of patients treated at the Buenos Aires University School of Dentistry / Utilización del Método de Demirjian para estimación de la edad dental en radiografías panorámicas de pacientes atendidos en la Facultad de Odontología de la Universidad de Buenos Aires

ABSTRACT The aim of this study was to determine the difference between real age (RA) and dental age (DA) in boys and girls from the Autonomous City of Buenos Aires (C.A.B.A.) by analyzing digital panoramic radiographs from the database of the Imaging Department at the Buenos Aires University School of Dentistry, using the Demirjian Method (DM). The sample consisted of 508 panoramic radiographs of 6- to 14-year old Argentines (268 female and 240 male). The Demirjian method was used to estimate dental age from each panoramic radiograph, and the Wilcoxon test was applied to perform a comparative analysis with the real age recorded in the image database. Average RA was 9.36 years (SD 2.11), and average DA according to the Demirjian method was 10.45 years (SD 2.31). For females, RA was 9.25 (SD 2.12), and DA according to the DM was 10.40 years (SD 2.41). For males, RA was 9.46 (SD 2.10), and DA according to the DM was 10.50 years (SD 2.22). An inter-class correlation coefficient (ICC) calculated as a correlation measure between dental age and real age was ICC = 1.09%. The ICC was 1.04% for the males and 1.15% for females. Significant differences were found between DA and RA (p <0.01) in general and according to sex. Real age was found to be lower than dental age in the study population from Buenos Aires City.

RESUMEN El objetivo del presente trabajo fue determinar la diferencia entre la edad real (ER) y la edad dental (ED) en niños y niñas de la Ciudad de Buenos Aires analizando radiografías panorámicas digitales de la base de datos de la Cátedra de Diagnóstico por imágenes FOUBA, utilizando el Método Demirjian (MD). La muestra consistió en 508 radiografías panorámicas (268 del sexo femenino y 240 del sexo masculino) en una población argentina de 6 a 14 años de edad. Se realizó el cálculo de la edad dental en cada una de ellas, conforme el método de Demirjian. Se efectuó un análisis comparativo con la ER proveniente de la base de datos, utilizando la prueba de Wilcoxon. En las 508 panorámicas se estimó la ED. Se pudo establecer que la ER en promedio es 9.36 años con un desviación estándar (DS) de 2,11 y que la edad según el método de Demirjian es 10,45 años con una DS de 2,31. Para el sexo femenino se obtuvo una ER de 9,25 y una DS de 2,12 y según MD es de 10,40 años con una DS de 2,41. Para el sexo masculino se obtuvo una ER de 9,46 y una DS de 2,10 y según MD es de 10,50 años con una DS de 2,22. Se obtuvo un coeficiente de correlación inter-clase (CCI), como medida de correlación entre edad dental y real, de (CCI 1,09%). El CCI para el sexo masculino fue de (CCI 1,04 %) y en el caso del sexo femenino fue de (CCI 1,15%). Se hallaron diferencias significativas entre ED y ER (p<0,01) en general y también para ambos sexos. Se pudo evidenciar que la edad real es menor que la edad dental en la población de la Ciudad de Buenos Aires.

Comparación entre edad cronológica y dental según tres métodos de estimación en una población peruana / Comparison between chronological and dental ages according to three estimation methods in a Peruvian population

Resumen Las técnicas de estimación de edad dental tienen gran importancia en la evaluación odontológica, específicamente en el área de ortodoncia, académica y forense. El objetivo de este estudio fue comparar la edad dental según los métodos de Demirjian, Nolla y Cameriere con la edad cronológica en una población peruana. El diseño del estudio es de tipo observacional, descriptivo, de corte transversal y retrospectivo; tuvo una población total de 578 radiografías panorámicas de sujetos de 6 a 14 años, en las cuales se calculó la diferencia de medias de un estudio previo y, finalmente, fueron seleccionadas 193 de forma aleatoria. Se compararon la edad cronológica (EC) y la edad dental (ED) según los métodos de Nolla, Demirjian y Cameriere, utilizando las Pruebas de Rangos de Wilcoxon y Kruskall Wallis. Las medias de la EC fueron de 8,77±2,34 y 8,90±2,04 años para el género femenino y masculino, respectivamente. Las diferencias de medias de la EC y ED, de acuerdo con los métodos Nolla, Demirjian y Cameriere, fue de -0,38, 0,96 y -0,29 años, respectivamente, para la muestra total de estudio. Se encontró una correlación positiva para los tres métodos estudiados; sin embargo, el método de Demirjian mostró una diferencia estadísticamente significativa con una subestimación de -0,91 años en la muestra total. Asimismo, el método de Cameriere fue el que tuvo más cercanía a la edad cronológica.

Abstract Dental age estimation techniques have great importance in dental evaluation, specifically in the orthodontic, academic, and forensic areas. The aim of this study was to compare the dental age according to the Demirjian, Nolla and Cameriere methods with the chronological age in a Peruvian population. This is an observational, descriptive, retrospective and cross-sectional study, which had a total population of 578 panoramic radiographs of subjects aged 6 to 14 years, where the difference in means from a previous study was calculated, and 193 subjects were finally randomly selected. The chronological ages (CA) and dental ages (DA) were compared using the Wilcoxon and Kruskall Wallis Range Tests. The means were 8.77 ± 2.34 and 8.90 ± 2.04 years of the CA for the female and male genders, respectively. The difference in means of the CA and DA according to the Nolla, Demirjian and Cameriere methods were -0.38, 0.96 and -0.21 years, respectively, for the total study sample. A positive correlation was found for the three methods studied; however, the Demirjian method showed a statistically significant difference with an underestimation of -0.91 years in the total sample. Also, the method of Cameriere was the closest to the chronological age.

Aplicación de las radiografías para la estimación forense de la edad dental: una perspectiva bioética / Application of X-rays for the forensic estimation of dental age: a bioethical perspective

Uno de los aspectos más relevantes del actual mundo globalizado reside en las incesantes corrientes mi-gratorias, donde un gran número de menores de edad se encuentran desprotegidos de sus derechos esen-ciales. En tales contextos, la estimación forense de la edad se sustenta en la aplicación multidisciplinaria de diferentes criterios científicos validados interna-cionalmente. La exposición a la radiación ionizante es común en técnicas destinadas a analizar los periodos de mineralización y cierre apical de la dentición de-finitiva, generando controversias respecto a la inva-sión que ello supone sobre la salud de las personas involucradas, cuestionándose que el acto pericial realizado no redunda en beneficios terapéuticos que justifiquen tal exposición. En ámbitos penales donde se busca dilucidar la mayoría de edad de jóvenes que han delinquido, la evaluación de los terceros molares representa una estrategia crucial para estimarla, constituyendo el índice de madurez (I3M) desarrolla-do por Cameriere et al., el método cuantitativo más di-fundido. El presente artículo reflexiona sobre aspec-tos bioéticos inherentes a tales procesos, poniendo énfasis en la autonomía, beneficencia, no maleficen-cia y justicia como principios insustituibles que deben respetarse en ámbitos afines a la edad forense (AU)

One of the most relevant aspects of the current globalized world lies in the incessant migratory flows, where a large number of minors are unprotected of their essential rights. In such contexts, the forensic estimation of age is based on the multidisciplinary application of different internationally validated scientific criteria. Exposure to ionizing radiation is common in techniques designed to analyze the periods of mineralization and apical closure of the final dentition, generating controversies regarding the invasion that this implies on the health of the people involved, questioning whether the expert act carried out does not redound in therapeutic benefits justifying such exposure. In criminal settings where it is sought to elucidate the age of majority of young people who have committed crimes, the evaluation of third molars represents a crucial strategy to estimate it, constituting the maturity index (I3M) developed by Cameriere et al., the most widespread quantitative method. This article reflects on bioethical aspects inherent to such processes, emphasizing in the autonomy, beneficence, non-maleficence and justice as irreplaceable principles that must be respected in areas related to forensic age (AU)

Evaluation of temporal bone pneumatization using panoramic radiography and cone beam computed tomography / Avaliação da pneumatização do osso temporal por meio de radiografia panorâmica e tomografia computadorizada de feixe cônico

Aim: To evaluate the presence and characteristics of pneumatizations in the roof of the mandibular fossa and articular eminence by panoramic radiography and cone beam computed tomography (CBCT).Methods: This study analyzed CBCT images of the temporomandibular joint of 705 patients, In 60 exams, it was possible to compare tomographic with panoramic images. For cases where pneumatization was present, laterality and pattern of manifestation were considered. A chi-square test was used to compare the differences between CBCT and panoramic radiography in the diagnosis of pneumatization. Results: Descriptive analysis revealed a sample profile that was predominantly female (75.9%), with a mean age of 42.6 years (± 17.4). The presence of pneumatizations in the roof of the mandibular fossa and articular eminence in CBCT images was identified in 330 (46.8%) and 154 (21.8%) exams, respectively, and the most frequent pneumatization pattern was the multilocular type in both locations. Bilateral pneumatization was more prevalent in the roof of the mandibular fossa. Considering the analysis of 60 pairs of exams, in panoramic radiography, pneumatizations in the roof of the mandibular fossa and articular eminence were identified in 22 (36.7%) and 12 (20.0%) examinations, respectively. Regarding CBCT images, pneumatizations in the roof of the mandibular fossa was observed in 24 (40.0%) exams, while articular eminence was found in 14 (23.3%) images. There were no statistically significant differences between the proportion of pneumatization identified by panoramic radiography and CBCT (p > 0.05). Conclusion: This study suggests that panoramic radiography may be an imaging method used to evaluate pneumatization in the temporomandibular joint region.

Objetivos: Avaliar a presença e as características da pneumatização no teto da fossa mandibular e eminência articular por meio de radiografias panorâmicas (RP) e tomografias computadorizadas de feixe cônico (TCFC). Métodos: Foram analisadas imagens tomográficas da ATM de 705 pacientes, sendo que 60 desses pacientes também possuíam RP. Para todos os casos foram avaliadas a presença, a lateralidade e o padrão de manifestação da pneumatização. O teste qui-quadrado foi empregado para comparar os resultados obtidos a partir das RP e das TCFC no que tange o diagnóstico das pneumatizações. Resultados: A análise descritiva revelou uma amostra predominantemente feminina (75,9%) com uma média de idade de 42,6 anos (± 17,4). A pneumatização no teto da fossa mandibular e eminência articular foi evidenciada em 330 (46,8%) e 154 (21,8%) imagens de TCFC, respectivamente, e o padrão de pneumatização mais frequente foi o multilocular em ambas as regiões. A pneumatização bilateral foi mais prevalente no teto da fossa mandibular. Considerando a análise dos 60 pares de exames, nas radiografias panorâmicas as pneumatizações no teto da fossa mandibular e eminência articular foram identificadas em 22 (36,7%) e 12 (20,0%) exames, respectivamente. Em relação às imagens tomográficas, a presença desse achado no teto da fossa foi observada em 24 (40,0%) exames e na eminência articular em 14 (23,3%). Não houve diferença com significância estatística entre a proporção de pneumatização identificada em RP e TCFC (p > 0,05). Conclusão: Os resultados obtidos sugerem que a radiografia panorâmica pode ser um método de diagnóstico por imagem empregado para avaliação de pneumatizações na região da ATM.