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1.
Int. j. morphol ; 38(2): 322-327, abr. 2020. tab, graf
Artigo em Espanhol | LILACS | ID: biblio-1056442

RESUMO

La estimación de edad compone un aspecto importante en investigaciones forenses. Diferentes métodos se han descrito en odontología forense basadas en la correlación entre la edad y estructuras dentales. Cameriere et al. proponen un método cuantitativo para estimación de edad en adultos, a partir de la evaluación de la relación del área pulpa/diente, en base a la aposición de dentina secundaria. El objetivo del estudio fue desarrollar modelos de regresión para la estimación de edad dental mediante la relación área pulpa/diente en caninos inferiores en una muestra Chilena. Se analizaron 212 radiografías periapicales digitales (RPD) (86 hombres y 126 mujeres) de caninos mandibulares mediante el programa Image J para establecer el área de la pulpa y el diente. Se registraron los datos de sexo y edad de las RPD seleccionadas en forma ciega. Fueron desarrollados modelos de regresión lineal simples para la estimación de edad. El coeficiente de determinación para R33 fue 27,8 % y de 29,6 % para R44, con un error absoluto medio de 11,02 años y 10,37 años respectivamente. El análisis de ANOVA no mostró diferencias estadísticamente significativas para las relaciones área pulpa/diente de caninos según sexo (p> 0,05). Según los resultados obtenidos, la metodología propuesta por Cameriere et al. es fiable para estimar la edad dental mediante la relación área pulpa/diente en adultos. Sin embargo, en los modelos de regresión desarrollados para la población Chilena, se puede afirmar que el ajuste indicado por los coeficientes de determinación muestran incerteza entre las variables área pulpa/diente y edad cronológica en caninos inferiores, por lo tanto se sugiere considerar otros métodos adicionales para estimar edad en esta población.


Age estimation is an important aspect In forensic investigations. Different methods in forensic odontology based on the correlation between age estimation in adults, from the analysis of the pulp/tooth area, based on the apposition of secondary dentine. The aim of the study was to develop regression models for the dental age estimation by the relation pulp/tooth area, in lower canines in a Chilean sample, using digital peri-apical radiographs (DPR) applying Cameriere's method. We analyzed 212 DPR (86 males and 126 females) mandibular canines through Image J program to measure the pulp/tooth area. Age and sex information was obtained of the DPR's blindly selected. We developed simple linear regression models for age estimation. The coefficient of determination to R33 was R2 age and dental structures have been described. Cameriere et al. proposed a quantitative method for 27.8 % and R2 29.6 % to R44, with a mean absolute error of 11.02 years, to R33 and 10.37 years to R44. ANOVA analysis showed no statistically significant differences for the pulp/tooth relation area of canines according to sex (p> 0.05). According to the results, the Cameriere's et al., method is reliable for dental age estimation according to pulp/tooth ratio in adults. However, in the regression models developed for Chilean population, it can be stated that the adjustment indicated by the coefficients of determination, show uncertainty between the pulp / tooth area and chronological age in lower canines, therefore it is suggested to use additional estimation methods for age in this population.


Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Pessoa de Meia-Idade , Idoso , Adulto Jovem , Dente/anatomia & histologia , Determinação da Idade pelos Dentes/métodos , Radiografia Dentária Digital/métodos , Polpa Dentária/anatomia & histologia , Dente/diagnóstico por imagem , Modelos Logísticos , Chile , Análise de Variância , Polpa Dentária/diagnóstico por imagem , Distribuição por Idade e Sexo , Odontologia Legal
2.
J Appl Oral Sci ; 28: e20190103, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32049131

RESUMO

OBJECTIVE: This study aimed to assess the association between tooth size and root canal morphology by using CBCT analysis. METHODOLOGY: In this retrospective study, tooth anatomic lengths (crown and root lengths, buccolingual and mesiodistal dimensions) of 384 patients were assessed and correlated with Vertucci's root canal morphology classification. Data was analyzed for gender-related differences using the independent sample t-test, ANOVA, and the Pearson's correlation for a possible relation between anatomic lengths and canal morphology. RESULTS: The maxillary first and second premolars showed a greater predilection for Type IV and II variants, respectively, while the mandibular first premolar showed a greater predilection for Type II canal system. The root canal system of the mandibular second premolar showed maximal diversity (47% Type I, 30% Type II, and 20% Type III). The dimensions were greater in men regardless of tooth type. The most significant relation (p<0.05) between the anatomic size and canal morphology was observed in the maxillary first premolars, followed by the mandibular canines (buccolingual dimension) and the lower second premolars (crown length). Negative correlations existed between the crown length and the patient's age for the anterior teeth and mandibular second premolar (r=-0.2, p<0.01). CONCLUSIONS: The most common canal formation for anterior teeth was the Type I. The anatomic lengths had the strongest influence on the canal configuration of the maxillary first premolar, with Type IV being the most common root canal system. The mandibular second premolars showed maximal diversity in the canal classification terms and had a significant correlation with their crown lengths. CLINICAL RELEVANCE: The complex relationship between the canal morphology and anatomic tooth sizes need meticulous awareness and recognition during endodontic procedures, in conjunction with the demographic variabilities.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Cavidade Pulpar/anatomia & histologia , Dente/anatomia & histologia , Adulto , Idoso , Análise de Variância , Cavidade Pulpar/diagnóstico por imagem , Feminino , Humanos , Masculino , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Maxila/anatomia & histologia , Maxila/diagnóstico por imagem , Pessoa de Meia-Idade , Odontometria/métodos , Valores de Referência , Estudos Retrospectivos , Fatores Sexuais , Dente/diagnóstico por imagem , Estados Unidos
3.
J Appl Oral Sci ; 28: e20190148, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32049133

RESUMO

OBJECTIVE: The site of the sinus tract depends on the rate of resistance against abscess exudate drainage, bone morphology, and distance from the root apex to the outer cortical bone. To assess apical bone thickness in buccal and palatal/lingual aspects of maxillary and mandibular teeth, using a high-resolution cone-beam computed tomography (CBCT) system. METHODOLOGY: In total, 422 CBCT examinations were included in the study, resulting in a sample of 1400 teeth. The scans were acquired by PreXion 3D, with a high-resolution protocol. The bone thickness was taken as the distance between the center of the apical foramen and the buccal and lingual/palatal cortical bone. The quantitative variables were expressed as mean values±standard deviation. The independent samples were analyzed using the t-test or the Mann-Whitney test (p<0.05). RESULTS: The lowest mean value of bone thickness was observed in the buccal cortical bone of the upper canines (1.49 mm±0.86) and in the upper central incisors (1.59 mm±0.67). In premolar teeth, the lowest values were found in the buccal cortical bone of upper first premolars (1.13 mm±0.68). In the posterior teeth, the lowest values were found in the buccal cortical bone of upper first molars (1.98 mm±1.33). In the lower second molar region, the buccal cortical bone (8.36 mm±1.84) was thicker than the lingual cortical bone (2.95 mm±1.16) (p<0.05). CONCLUSIONS: The lowest mean values of bone thickness are in the buccal cortical bone of the maxillary teeth. In the mandible, bone thickness is thinner in the buccal bone around the anterior and premolar teeth, and in the lingual aspect of mandibular molars. All these anatomic characteristics could make the occurrence of the sinus tract more susceptible in these specific regions of the maxillary and mandibular alveolar bone.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Mandíbula/anatomia & histologia , Maxila/anatomia & histologia , Dente/anatomia & histologia , Adulto , Feminino , Humanos , Masculino , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem , Odontometria/métodos , Valores de Referência , Estatísticas não Paramétricas , Dente/diagnóstico por imagem
4.
Head Face Med ; 16(1): 1, 2020 Jan 27.
Artigo em Inglês | MEDLINE | ID: mdl-31987041

RESUMO

INTRODUCTION: Cone-Beam Computed Tomography (CBCT) images can be superimposed, allowing three-dimensional (3D) evaluation of craniofacial growth/treatment effects. Limitations of 3D superimposition techniques are related to imaging quality, software/hardware performance, reference areas chosen, and landmark points/volumes identification errors. The aims of this research are to determine/compare the intra-rater reliability generated by three 3D superimposition methods using CBCT images, and compare the changes observed in treated cases by these methods. METHODS: Thirty-six growing individuals (11-14 years old) were selected from patients that received orthodontic treatment. Before and after treatment (average 24 months apart) CBCTs were analyzed using three superimposition methods. The superimposed scans with the two voxel-based methods were used to construct surface models and quantify differences using SlicerCMF software, while distances in the landmark-derived method were calculated using Excel. 3D linear measurements of the models superimposed with each method were then compared. RESULTS: Repeated measurements with each method separately presented good to excellent intraclass correlation coefficient (ICC ≥ 0.825). ICC values were the lowest when comparing the landmark-based method and both voxel-based methods. Moderate to excellent agreement was observed when comparing the voxel-based methods against each other. The landmark-based method generated the highest measurement error. CONCLUSIONS: Findings indicate good to excellent intra-examiner reliability of the three 3D superimposition methods when assessed individually. However, when assessing reliability among the three methods, ICC demonstrated less powerful agreement. The measurements with two of the three methods (CMFreg/Slicer and Dolphin) showed similar mean differences; however, the accuracy of the results could not be determined.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Imageamento Tridimensional , Dente , Adolescente , Cefalometria , Criança , Assistência Odontológica , Humanos , Ortodontia , Reprodutibilidade dos Testes , Dente/diagnóstico por imagem
5.
Dentomaxillofac Radiol ; 49(1): 20190249, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31356110

RESUMO

OBJECTIVES: Aim of this technical note is to show the applicability of cinematic rendering (CR) for a photorealistic 3-dimensional (3D) visualization of maxillofacial structures. The focus is on maxillofacial hard tissue pathologies. METHODS: High density maxillofacial pathologies were selected in which CR is applicable. Data from both, CT and cone beam CT (CBCT) were postprocessed using a prototype CR software. RESULTS: CR 3D postprocessing of CT and CBCT imaging data is applicable on high density structures and pathologies such as bones, teeth, and tissue calcifications. Image reconstruction allows for a detailed visualization of surface structures, their plasticity, and 3D configuration. CONCLUSIONS: CR allows for the generation of photorealistic 3D reconstructions of high density structures and pathologies. Potential applications for maxillofacial bone and tooth imaging are given and examples for CT and CBCT images are displayed.


Assuntos
Imageamento Tridimensional , Dente , Tomografia Computadorizada de Feixe Cônico , Humanos , Processamento de Imagem Assistida por Computador , Maxila/diagnóstico por imagem , Software , Dente/diagnóstico por imagem , Dente/patologia
6.
Sensors (Basel) ; 19(24)2019 Dec 12.
Artigo em Inglês | MEDLINE | ID: mdl-31842494

RESUMO

Periodontal diagnosis requires discovery of the relations among teeth, gingiva (i.e., gums), and alveolar bones, but alveolar bones are inside gingiva and not visible for inspection. Traditional probe examination causes pain, and X-ray based examination is not suited for frequent inspection. This work develops an automatic non-invasive periodontal inspection framework based on gum penetrative Optical Coherence Tomography (OCT), which can be frequently applied without high radiation. We sum up interference responses of all penetration depths for all shooting directions respectively to form the shooting amplitude projection. Because the reaching interference strength decays exponentially with tissues' penetration depth, this projection mainly reveals the responses of the top most gingiva or teeth. Since gingiva and teeth have different air-tissue responses, the gumline, revealing itself as an obvious boundary between teeth and gingiva, is the basis line for periodontal inspection. Our system can also automatically identify regions of gingiva, teeth, and alveolar bones from slices of the cross-sectional volume. Although deep networks can successfully and possibly segment noisy maps, reducing the number of manually labeled maps for training is critical for our framework. In order to enhance the effectiveness and efficiency of training and classification, we adjust Snake segmentation to consider neighboring slices in order to locate those regions possibly containing gingiva-teeth and gingiva-alveolar boundaries. Additionally, we also adapt a truncated direct logarithm based on the Snake-segmented region for intensity quantization to emphasize these boundaries for easier identification. Later, the alveolar-gingiva boundary point directly under the gumline is the desired alveolar sample, and we can measure the distance between the gumline and alveolar line for visualization and direct periodontal inspection. At the end, we experimentally verify our choice in intensity quantization and boundary identification against several other algorithms while applying the framework to locate gumline and alveolar line in vivo data successfully.


Assuntos
Gengiva/diagnóstico por imagem , Doenças Periodontais/diagnóstico , Tomografia de Coerência Óptica , Dente/diagnóstico por imagem , Perda do Osso Alveolar/diagnóstico , Perda do Osso Alveolar/diagnóstico por imagem , Humanos , Doenças Periodontais/patologia
7.
Sensors (Basel) ; 19(19)2019 Sep 29.
Artigo em Inglês | MEDLINE | ID: mdl-31569554

RESUMO

Digital dental reconstruction can be a more efficient and effective mechanism for artificial crown construction and period inspection. However, optical methods cannot reconstruct those portions under gums, and X-ray-based methods have high radiation to limit their applied frequency. Optical coherence tomography (OCT) can harmlessly penetrate gums using low-coherence infrared rays, and thus, this work designs an OCT-based framework for dental reconstruction using optical rectification, fast Fourier transform, volumetric boundary detection, and Poisson surface reconstruction to overcome noisy imaging. Additionally, in order to operate in a patient's mouth, the caliber of the injector is small along with its short penetration depth and effective operation range, and thus, reconstruction requires multiple scans from various directions along with proper alignment. However, flat regions, such as the mesial side of front teeth, may not have enough features for alignment. As a result, we design a scanning order for different types of teeth starting from an area of abundant features for easier alignment while using gyros to track scanned postures for better initial orientations. It is important to provide immediate feedback for each scan, and thus, we accelerate the entire signal processing, boundary detection, and point-cloud alignment using Graphics Processing Units (GPUs) while streamlining the data transfer and GPU computations. Finally, our framework can successfully reconstruct three isolated teeth and a side of one living tooth with comparable precisions against the state-of-art method. Moreover, a user study also verifies the effectiveness of our interactive feedback for efficient and fast clinic scanning.


Assuntos
Processamento de Imagem Assistida por Computador/métodos , Tomografia de Coerência Óptica/métodos , Dente/diagnóstico por imagem , Calibragem , Desenho de Equipamento , Análise de Fourier , Gengiva/diagnóstico por imagem , Humanos , Tomografia de Coerência Óptica/instrumentação
8.
Forensic Sci Int ; 303: 109927, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31491623

RESUMO

The aim of this study was to test the accuracy of Demirjian's method for dental age (DA) estimation on north German children, to adapt the method used in case of inaccuracy in this sample and to construct dental maturity percentile curves for this population. Orthopantomograms (OPGs) of 1260 north German children (566 males and 694 females) aged 5-17 years were used from patients' records of the Department of Orthodontics, Dentofacial Orthopedics and Pedodontics, Charité - Universitätsmedizin Berlin, Germany. Demirjian's dental maturity scale for the seven left mandibular teeth was applied to the first sample (951 OPGs) to estimate the DA and compare it to the chronological age (CA) of each child. For the adaptation of Demirjian's method on this sample of radiographs, new weighted maturity scores were created by the use of linear regression. Polynomial percentile curves of the total dental maturity in comparison to the CA are presented. The second sample (309 OPGs) was used to evaluate the adapted method and compare it to Demirjian's method. Demirjian's method overestimated the mean CA of boys by 0.46±0.86 years (mean difference±standard deviation) and of girls by 0.55±0.95 years. The new adapted weighted scores estimated the CA of boys (0.07±0.82 years) and girls (-0.04±0.82 years) more accurately. The adapted method showed no significant difference between DA and CA. The method by Demirjian et al., when applied to north German children, significantly overestimated most age cohorts for both sexes. The adapted north German weighted scores and percentile curves showed a notable improvement in age estimation and were more reliable for CA estimation and DA assessment.


Assuntos
Determinação da Idade pelos Dentes/métodos , Radiografia Panorâmica , Calcificação de Dente , Dente/diagnóstico por imagem , Dente/crescimento & desenvolvimento , Adolescente , Criança , Pré-Escolar , Feminino , Alemanha , Humanos , Masculino , Mandíbula
9.
Am J Orthod Dentofacial Orthop ; 156(3): 365-374, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31474266

RESUMO

INTRODUCTION: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. METHODS: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. RESULTS: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. CONCLUSIONS: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.


Assuntos
Imageamento Tridimensional/métodos , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Dente/anatomia & histologia , Dente/diagnóstico por imagem , Processo Alveolar/anatomia & histologia , Processo Alveolar/diagnóstico por imagem , Dente Pré-Molar/anatomia & histologia , Dente Pré-Molar/diagnóstico por imagem , Arco Dental , Modelos Dentários , Análise de Elementos Finitos , Humanos , Dente Molar/anatomia & histologia , Dente Molar/diagnóstico por imagem , Ortodontia Corretiva , Ligamento Periodontal/anatomia & histologia , Ligamento Periodontal/diagnóstico por imagem , Técnicas de Movimentação Dentária
10.
Analyst ; 144(20): 6089-6097, 2019 Oct 21.
Artigo em Inglês | MEDLINE | ID: mdl-31531497

RESUMO

Raman spectroscopy is a powerful analytical tool to be used in many biomedical applications and could be potentially translated into clinical work. The challenge of Raman spectroscopy in biomedical applications is the high inherent fluorescence of biological samples. One promising method to suppress the fluorescence background is to use pulsed lasers and time-gated detectors but the complexity of time-gated systems has hindered their widespread usage. We present here chemical imaging of human teeth by means of a new kind of compact and practical fluorescence-suppressed Raman spectrometer based on a time-resolved 16 × 256 CMOS single-photon avalanche diode (SPAD) line sensor with an integrated 256-channel 3-bit on-chip time-to-digital converter. The chemical images were constructed by utilizing a simple unsupervised machine learning algorithm (k-means clustering). The high quality of Raman spectra measured with the time-resolved CMOS SPAD-based Raman spectrometer was verified by comparing the spectra to those collected with a commercial conventional continuous wave (CW) Raman spectrometer. The spectra measured by using the time-resolved CMOS SPAD-based Raman spectrometer had 4.4-8.8 times higher signal to peak-to-peak noise ratio values than the spectra from the CW Raman spectrometer when the same radiant exposure (∼300 J mm-2) was used with both spectrometers. This paper shows in practice the potential of time-resolved CMOS SPAD-based Raman spectroscopy in the field of biomedicine and we expect that the presented technology could pave the way for the development of new kind of compact and practical fluorescence-suppressed Raman spectrometers to be used both in biomedical research and clinical settings.


Assuntos
Análise Espectral Raman , Dente/diagnóstico por imagem , Algoritmos , Humanos , Fótons , Espectrometria de Fluorescência/métodos , Análise Espectral Raman/instrumentação , Análise Espectral Raman/métodos
11.
Forensic Sci Int ; 302: 109912, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31408787

RESUMO

Tooth development evaluation is majorly the current approach to identify age and maturity. Dental age (DA) is therefore considerably emphasized in forensic and pediatric dentistry. The aim of this study was to assess the applicability of Willems and Cameriere methods for Turkish children. Panoramic images of 636 Turkish healthy children (319 male; 317 female) aged between 6 and 15 years were assessed. DA of the subjects was determined by using Willems and Cameriere methods. The seven right and left permanent lower teeth were valued using these two methods. The mean chronological age (CA) of the subjects was 11.53±2.25 (min:6, max:14.99) years (boys: 11.29±2.34 years, girls: 11.77±2.15 years). Willems method overestimated the CA (p≤0.001), in contrast, Cameriere method underestimated the CA (p≤0.001) for both sexes. In different age groups the mean difference between the CA and DA calculated by Cameriere method (CADA) ranged from 0.86 to -0.41 years for boys and from 1.00 to -0.21 years for girls, while the mean difference between the CA and DA calculated by Willems method ranged from -0.26 to -0.71 years for boys and from 0.19 to -0.76 years for girls. Cameriere method provided a better percentage of accuracy (84.6% and 77.3% for males and females, respectively) in the absolute difference values within 1 year compared to Willems method. Cameriere method performed slightly better but, both methods may be used for DA estimation in the Turkish population.


Assuntos
Determinação da Idade pelos Dentes/métodos , Radiografia Panorâmica , Ápice Dentário/crescimento & desenvolvimento , Calcificação de Dente , Dente/crescimento & desenvolvimento , Adolescente , Criança , Feminino , Odontologia Legal , Humanos , Masculino , Reprodutibilidade dos Testes , Dente/diagnóstico por imagem , Ápice Dentário/diagnóstico por imagem , Turquia
12.
J Appl Oral Sci ; 27: e20180722, 2019 Aug 12.
Artigo em Inglês | MEDLINE | ID: mdl-31411266

RESUMO

OBJECTIVES: Age estimation is one of the most important factors in forensic medicine. Measuring secondary dentin deposition using cone-beam computed tomography images is an easy and noninvasive method. The aim of this study was to evaluate cone-beam computed tomography images as a reliable method to estimate chronological age by pulp/teeth ratio in anterior teeth in Iranian population. METHODOLOGY: A total of 649 CBCT images from 377 Iranian patients aged between 20 and 69 years were evaluated. Pulp/teeth ratio (PTR) in maxillary and mandibular canine and central incisor teeth was measured in the axial and sagittal sections using OnDemand 3D Dental software. The Pearson correlation coefficient was determined to evaluate the correlation between the variables. Linear regression analysis, as well as age estimation formula, was used for each tooth separately. RESULTS: The regression analyses indicated that maxillary central incisors were more reliable for age estimation (R2=0.586 and standard error of estimate=7.045) compared with the other anterior teeth studied. Maxillary canine teeth had the lowest predictive power (R2=0.392 and standard error of estimate=8.387). Also, comparison of the axial and sagittal sections showed that the axial sections had a higher predictive power. (R2=0.48 for axial plans and R2=0.328 for sagittal plans). CONCLUSION: The use of cone-beam computed tomography in age estimation by pulp/teeth ratio of anterior teeth is useful and a reliable method for age estimation in Iranian population.


Assuntos
Determinação da Idade pelos Dentes/métodos , Tomografia Computadorizada de Feixe Cônico/métodos , Polpa Dentária/anatomia & histologia , Polpa Dentária/diagnóstico por imagem , Dente/anatomia & histologia , Dente/diagnóstico por imagem , Adulto , Fatores Etários , Idoso , Dente Canino/anatomia & histologia , Dente Canino/diagnóstico por imagem , Feminino , Humanos , Imageamento Tridimensional , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Modelos Lineares , Masculino , Pessoa de Meia-Idade , Tamanho do Órgão , Valores de Referência , Reprodutibilidade dos Testes , Fatores Sexuais , Adulto Jovem
13.
Cient. dent. (Ed. impr.) ; 16(2): 117-121, mayo-ago. 2019. tab
Artigo em Espanhol | IBECS | ID: ibc-183722

RESUMO

La técnica radiográfica de aleta de mordida es el "talón de Aquiles" para el diagnóstico de caries interproximales en pacientes infantiles. En ocasiones las placas radiográficas disponibles están sobredimensionadas dificultando con ello el desarrollo de esta técnica. Se establece como objetivo determinar las dimensiones óseas y dentarias en niños con dentición temporal completa para obtener el tamaño ideal de una placa que permita una adecuada técnica interproximal. Se realizó un estudio transversal, observacional y descriptivo con un tamaño muestral de 65 pacientes de 3 a 5 años que precisen un diagnóstico clínico y radiográfico. Tras realizar las mediciones oportunas se determinó un tamaño radiográfico óptimo para posteriormente comprobar su fiabilidad. La dimensión de la placa definitiva fue de 15x25 mm. No se observó isquemia a nivel de la mucosa, tampoco reflejos nauseosos, sin embargo 4 pacientes expulsaron en un primer intento la placa recortada. En la literatura no se han encontrado estudios con relación al tamaño ideal de placas radiográficas en función de la edad del paciente. El uso de una placa de menores dimensiones es más confortable y fácil de utilizar a edades precoces


The radiographic technique of bite wing is the "Achilles heel" for the diagnosis of interproximal caries in children. Sometimes the available radiographic plates are oversized, making the development of this technique difficult. The objective is to determine the bone and dental dimensions in children with full temporal dentition to obtain the ideal size of a plate that allows an adequate interproximal technique. A cross-sectional, observational and descriptive study was carried out with a sample size of 65 patients from 3 to 5 years of age whore quired a clinical and radiographic diagnosis. After making the appropriate measurements, an optimal radiographic size was determined to subsequently verify its reliability. The size of the final plate was 15 x 25 mm. No ischemia was observed at the mucosa level, neither nauseous reflexes, however 4 patients expelled the cut-off plate in a first attempt. In the literature, no studies have been found in relation to the ideal size of radiographic plates according to the age of the patient. The use of a smaller plate is more comfortable and easier to use at an early age


Assuntos
Humanos , Pré-Escolar , Radiografia/métodos , Radiografia/normas , Dente/anatomia & histologia , Dente/diagnóstico por imagem , Projetos Piloto , Odontopediatria , Estudos Transversais , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Maxila/anatomia & histologia , Maxila/diagnóstico por imagem
14.
J Forensic Odontostomatol ; 37(1): 32-39, 2019 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-31187741

RESUMO

This study is aimed at finding the predictive accuracy of Demirjian's (D), modified Demirjian's (MD) and India specific age estimation methods (AA) Indian specific age estimation methods in 522 healthy children of Odisha population among 3-18 years. Correlations between chronological age (CA) and derived age (DA) by above mentioned methods were evaluated by Wilcoxon signed rank test and Pearson's correlation analysis. Analysis of mean absolute error concluded that D and MD predicted the CA with fair accuracy, whereas, AA had lower accuracy in Odisha children. Odisha specific polynomial regression formula, derived in this study is showing a strong correlation with CA (r=0.84). Comparison of mean absolute error of D, MD, AA and Odisha specific method indicated a better predictive accuracy of Odisha specific method.


Assuntos
Determinação da Idade pelos Dentes/métodos , Adolescente , Criança , Pré-Escolar , Estudos Transversais , Feminino , Humanos , Índia , Masculino , Radiografia Panorâmica , Análise de Regressão , Reprodutibilidade dos Testes , Dente/diagnóstico por imagem , Dente/crescimento & desenvolvimento , Calcificação de Dente
15.
J Forensic Odontostomatol ; 37(1): 40-50, 2019 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-31187742

RESUMO

BACKGROUND: Demirjian's method of age estimation has been reported to overestimate age and Willems' method to give consistently more accurate results. Not enough, however, is known about the applicability of Chaillet's standards. AIM: The present study aimed to compare the accuracy of Demirjian's, Willems' and Chaillet's standards in age estimation of 5 to 15 year-old Indian children. DESIGN: In this cross-sectional observational study, three methods were compared for accuracy in estimating the age of 1200 Indian children aged 5-15 years. RESULTS: Demirjian's method overestimated age by +0.24 ± 0.80 years, +0.11 ± 0.81years and +0.19 ± 0.80 years in boys, girls and the total sample, respectively. With Willems' method, overestimations of +0.09 ± 0.80 years, +0.08 ± 0.80 years and +0.09 ± 0.80 years were obtained in boys, girls and the total sample, respectively. Chaillet's method underestimated age by -0.12 ± 0.69 years, -0.45 ± 0.88 years and -0.25 ± 0.83 years in boys, girls and the total sample, respectively. Statistically significant differences were observed between dental and chronological ages with all methods (p < 0.001). Significant sex-based differences were observed only with Demirjian's and Chaillet's methods (p < 0.05). CONCLUSION: Willems' method was the most accurate in age estimation, followed by Demirjian's and Chaillet's methods. While Demirjian's method was more accurate than Chaillet's in females, Chaillet's method better predicted the age of males.


Assuntos
Determinação da Idade pelos Dentes/métodos , Criança , Pré-Escolar , Estudos Transversais , Feminino , Humanos , Índia , Masculino , Radiografia Panorâmica , Análise de Regressão , Dente/diagnóstico por imagem , Dente/crescimento & desenvolvimento , Calcificação de Dente
16.
Forensic Sci Int ; 301: 318-325, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31202144

RESUMO

The aim of this study was to estimate the age of subjects from their dental age by showing the different stages of tooth development using the Nolla method in a Spanish population sample considering the gender, age group, and the development of the two dental arches. The sample consisted of 604 orthopantomographs corresponding to Spanish children (male: 302 and female: 302) aged from 4 to 14 years old. The resulting chronological and dental ages were compared using Student's t-test. We obtained a good index of agreement between the evaluators and good internal consistency in the evaluation of the ages of the teeth. In general, the dental age estimates were lower than the chronological ages, obtaining an underestimation with the application of the Nolla method. In the male group, the average dental age of the maxillary teeth was 8.36 years and that of the mandibular teeth was 8.40 years, compared to the chronological age of 8.84 years in both cases. In the female group, the average dental age of the maxillary teeth was 7.76 years and that of the mandibular teeth was 7.88 years, compared to the chronological age of 8.70 years in both cases. On applying the Nolla method to our sample, a significant overestimation was observed only in children aged between 4 and 6.9 years. The Nolla method can be used as a complementary tool for estimating age in children of Spanish origin. The application of this method is more favourable in the case of individuals evaluated under the law applied to minors. In general, with this method, age is underestimated, but the calculations involved are reliable, and greater precision has been observed in male than in female. The data from this study can be used as a reference to determine the dental maturity of Spanish children and to estimate their ages.


Assuntos
Determinação da Idade pelos Dentes/métodos , Radiografia Panorâmica , Calcificação de Dente , Dente/crescimento & desenvolvimento , Adolescente , Criança , Estudos Transversais , Feminino , Humanos , Masculino , Reprodutibilidade dos Testes , Espanha , Dente/diagnóstico por imagem
17.
Int. j. morphol ; 37(2): 548-553, June 2019. tab, graf
Artigo em Espanhol | LILACS | ID: biblio-1002257

RESUMO

El uso de un método rápido y efectivo para la estimación de la maduración esquelética de los pacientes pediátricos es fundamental para la aplicación oportuna de tratamientos ortopédicos/ortodónticos. En Odontología Pediátrica, la toma de una radiografía panorámica, como método diagnóstico de rutina, puede servir para estimar con precisión el estadio de maduración en estos pacientes, mediante el cálculo de la edad dental. El objetivo del presente trabajo fue determinar la correlación entre las edades cronológica y dental con los estadios de maduración esquelética de las vértebras cervicales, a través del método estadístico no paramétrico con Rho de Spearman. Se utilizó un diseño observacional, transversal y analítico. La muestra consistió en 516 expedientes de pacientes entre los 5 y 15 años de edad, sistémicamente sanos, con radiografías panorámica y lateral de cráneo, tomadas en la misma fecha. Se determinó la edad cronológica de cada paciente según su historia clínica. Se realizó el cálculo de la edad dental de cada paciente con el método de Demirjian, y se determinó el estadio de maduración de vértebras cervicales con el método de Lamparski. Se determinó una correlación de 72 % entre la edad cronológica y la maduración ósea vertebral; una correlación del 66 % entre la edad dental y la maduración ósea, y una correlación del 86 % entre la edad cronológica y la dental. De acuerdo con estos resultados, tanto la edad cronológica y dental presentan una alta correlación con la edad de maduración vertebral. Se concluye así que la edad dental y cronológica son indicadores apropiados para estimar el estadio de maduración esquelética de los pacientes pediátricos.


The use of fast and effective methods for estimating the skeletal maturity for pediatric patients, is fundamental for the opportune application of orthopedic/orthodontic treatments. In pediatric dentistry, the panoramic radiography as a routine diagnostic method, can be used to estimate the stage of maturation in these patients, through the calculation of dental age. The aim of the present study is to determine the correlation between the chronological and dental ages, with the cervical vertebrae stages of skeletal maturity, through the non-parametric Spearman statistical method. An observational, transversal, and analytical design was employed. The sample consisted of 516 records from patients between 5 and 15 years of age, systemically healthy, with panoramic and lateral skull radiographs taken on the same date. The chronological age of each patient was determined according to the clinical history. Dental age of each patient was calculated with the Demirjian approach, and the stage of maturation of cervical vertebrae was determined by means of the Lamparski method. The results showed a correlation of 72 % between chronological age and bone maturation, a correlation of 66 % between dental age and bone maturation, and a correlation of 86 % between chronological and dental age. It is concluded that both chronological and dental age exhibit a high correlation with the correspondent stage of vertebral maturity. Thus, dental and chronological age are appropriate indicators to estimate, with high precision the stage of skeletal maturation in pediatric patients.


Assuntos
Humanos , Masculino , Feminino , Criança , Adolescente , Dente/crescimento & desenvolvimento , Determinação da Idade pelo Esqueleto/métodos , Determinação da Idade pelos Dentes/métodos , Vértebras Cervicais/crescimento & desenvolvimento , Dente/diagnóstico por imagem , Vértebras Cervicais/diagnóstico por imagem , Estudos Transversais , Estatísticas não Paramétricas
18.
Forensic Sci Int ; 301: 76-81, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31132549

RESUMO

The Kvaal method as a non-invasive method for age estimation based on the changes of pulpal size caused by secondary dentin deposition has been applied to different ethnics. However, its results are often conflicting and its accuracy is relatively poor. This study aimed to verify the applicability of the Kvaal method to estimate the ages of the Chinese population using digital panoramic radiographs and to formulate specific regression equations for use in Chinese subjects. A sample of 360 digital panoramic radiographs from northern Chinese population were selected, from which the pulpal size and width of six tooth types (maxillary central incisor, lateral incisor, second premolar, mandibular lateral incisor, canine, and first premolar) were measured using Kvaal's method. Then, inter- and intra-observer reliabilities were calculated to evaluate the reproducibility of those measurements. The correlation between chronological age and measurements was also examined and the Chinese-specific equations for age estimation were conducted. After comparing the accuracy of the Chinese-specific equation with the original Kvaal equation, the age of the Chinese population was clearly overestimated by Kvaal's equation, and a Chinese-specific equation could ameliorate age prediction accuracy. In addition, the residuals of the Chinese-specific equation were significantly lower than that of the original Kvaal's method. Thus, we concluded that the original Kvaal equation cannot accurately estimate age in the Chinese population. Although accuracy improved using the Chinese-specific equation that was based on Kvaal's methodology, the standard deviation remained large. In view of the lack of accurate age estimation methods for adults, we propose finding more correlated variables or combining other age estimation methods to increase the accuracy for adult age estimation.


Assuntos
Determinação da Idade pelos Dentes/métodos , Polpa Dentária/diagnóstico por imagem , Radiografia Dentária Digital , Radiografia Panorâmica , Ápice Dentário/diagnóstico por imagem , Dente/diagnóstico por imagem , Adulto , Idoso , Grupo com Ancestrais do Continente Asiático , China , Polpa Dentária/anatomia & histologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Análise de Regressão , Reprodutibilidade dos Testes , Software , Dente/anatomia & histologia , Ápice Dentário/anatomia & histologia , Raiz Dentária/anatomia & histologia , Raiz Dentária/diagnóstico por imagem , Adulto Jovem
19.
Comput Methods Programs Biomed ; 175: 205-214, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31104708

RESUMO

BACKGROUND AND OBJECTIVE: Panoramic images reconstructed from dental cone beam CT (CBCT) data have been effectively used in dental clinics for disease diagnosis. Panoramic images generally have low contrast because excessive non-interest tissues participate in the reconstruction, which may affect the diagnosis. In this study, we developed a fully automatic reconstruction method to improve the global and detail contrast of panoramic images. METHODS: The proposed method consists of dental arch thickness detection, image synthesis, and image enhancement. First, the dental arch thickness is detected from an axial maximum intensity projection (MIP) image generated from the axial slices containing the teeth to reduce non-interest tissues in panoramic image reconstruction. Then, a new synthesis algorithm is proposed at image synthesis stage to reduce the effect of non-interest tissues on image contrast. Finally, an image enhancement algorithm is applied to the synthesized image to improve the detail contrast of the final panoramic image. RESULTS: A total of 129 real clinical dental CBCT data sets were used to test the proposed method. The panoramic images generated by three methods were subjectively scored by three experienced dentists who were blinded to the generated method. The evaluation of image contrast included the maxillary, mandible, teeth, and particular region (root canal, crown reconstruction, implants, and metal brackets). The overall image contrast score revealed that the proposed method scored the highest of 11.03 ±â€¯2.46, followed by the ray sum and x-ray methods with corresponding scores of 6.4 ±â€¯1.65 and 5.35 ±â€¯1.56. The results of expert subjective scoring indicated that the image contrast of the panoramic image generated by the proposed method is higher than those of existing methods. CONCLUSIONS: The proposed method provides a quick, effective and robust solution to improve the global and detail contrast of the panoramic image generated from dental CBCT data.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Arco Dental/diagnóstico por imagem , Processamento de Imagem Assistida por Computador/métodos , Radiografia Dentária , Radiografia Panorâmica , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Algoritmos , Criança , Feminino , Humanos , Masculino , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem , Pessoa de Meia-Idade , Reconhecimento Automatizado de Padrão , Reprodutibilidade dos Testes , Dente/diagnóstico por imagem , Adulto Jovem
20.
Comput Methods Programs Biomed ; 175: 215-222, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31104709

RESUMO

BACKGROUND AND OBJECTIVE: Computed tomography (CT) is one of the most frequently used medical imaging methods. An important application area of CT is dental implants, which require precise inspection and analysis of oral structures. Since CT provides a precise 3D model of the teeth, bones and nerves, it can be used as a surgical guide for dental implants. Along with CT, optical 3D images called stereolithography (STL) have also been widely used. STL images obtained from optical 3D images can be used to show the 3D surfaces of oral structures. Since CT data and STL data deploy different technologies to obtain dental information, we can obtain more accurate dental implants by combining the two datasets. Since the two datasets are acquired by using different sensors, the datasets need to be registered. METHODS: An automatic matching algorithm is proposed for CT and STL image registration, which is based on depth maps and maximum intensity projection. Then, fine tuning was performed based on volume matching. RESULTS: When applied to real-world databases, the proposed method provided an average matching error of 2.7 mm for the upper jaw and 2.3 mm for the lower jaw with an average processing time of about 19 s. CONCLUSIONS: The proposed method performs accurate registration of CT and STL.


Assuntos
Estereolitografia , Tomografia Computadorizada por Raios X , Algoritmos , Humanos , Processamento de Imagem Assistida por Computador , Imageamento Tridimensional/métodos , Modelos Anatômicos , Reconhecimento Automatizado de Padrão , Reprodutibilidade dos Testes , Dente/diagnóstico por imagem , Raios X
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