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1.
Dental press j. orthod. (Impr.) ; 27(4): e222136, 2022. tab, graf
Article in English | LILACS-Express | LILACS, BBO | ID: biblio-1404487

ABSTRACT

ABSTRACT Objective: The present study aimed to investigate the relationship between tooth inclination and gingival and bone dimensions in maxillary anterior teeth. Methods: This cross-sectional study included cone-beam computed tomography (CBCT) images of 160 maxillary anterior teeth (30 individuals). Tooth inclination, gingival and bone thickness, and distances from cementoenamel junction to alveolar bone crest and gingival margin were measured in the labial surface. The correlations were analyzed using Pearson and partial correlation tests (p≤0.05). Results: In the central incisors, tooth inclination was positively and significantly related to apical bone thickness (R = 0.34, p= 0.001). In the canines, tooth inclination was negatively and significantly related to cervical bone thickness (R = - 0.34, p= 0.01) and positively associated to apical bone thickness (R = 0.36, p= 0.01) and to gingival margin-cementoenamel junction distance (R = 0.31, p= 0.03). In the lateral incisors, tooth inclination was not associated with gingival or bone dimensions. Conclusions: In the central incisors, the greater the labial tooth inclination, the greater is the apical bone thickness. In the canines, the greater the labial tooth inclination, the smallest is the cervical bone thickness, the greater is the apical bone thickness, and the greater is the gingival margin. Gingival and bone dimensions should be assessed when planning orthodontic treatment involving buccal movement of central incisors and canines.


RESUMO Objetivo: O presente estudo teve como objetivo investigar a relação entre a inclinação dentária e as dimensões ósseas e gengivais em dentes anteriores superiores. Métodos: Esse estudo transversal incluiu imagens de tomografia computadorizada de feixe cônico (TCFC) de 160 dentes anteriores superiores divididos em três grupos (incisivo central, incisivo lateral e canino). Todos os pacientes tinham 18 anos ou mais, não tinham tratamento ortodôntico prévio nem história clínica que pudesse afetar as dimensões ósseas ou gengivais. A inclinação dentária, a espessura do osso e da gengiva e as distâncias da junção cemento-esmalte à crista óssea alveolar e à margem gengival foram medidas na face vestibular. As correlações foram analisadas por meio dos testes de Pearson e de correlação parcial (p≤0,05). Resultados: Nos incisivos centrais, a inclinação dentária foi positiva e significativamente relacionada à espessura do osso apical (R = 0,34, p= 0,001). Nos caninos, a inclinação dentária foi negativa e significativamente relacionada à espessura do osso cervical (R = - 0,34, p= 0,01) e positivamente associada à espessura do osso apical (R = 0,36, p= 0,01) e à distância entre a margem gengival e a junção cemento-esmalte (R = 0,31, p= 0,03). Nos incisivos laterais, a inclinação do dente não foi associada às dimensões do osso ou da gengiva. Conclusões: Nos incisivos centrais, quanto maior a inclinação vestibular do dente, maior a espessura do osso apical. Nos caninos, quanto maior a inclinação vestibular do dente, menor a espessura do osso cervical, maior a espessura do osso apical e maior a margem gengival. As dimensões ósseas e gengivais devem ser avaliadas ao se planejar o tratamento ortodôntico envolvendo a movimentação vestibular dos incisivos centrais e caninos.

2.
J. Health Biol. Sci. (Online) ; 7(2): 172-176, abr.-jun. 2019.
Article in Portuguese | LILACS | ID: biblio-1005733

ABSTRACT

Introdução: o diagnóstico de fratura radicular é difícil, pois não há sinais/sintomas clínicos e características radiográficas patognomônicas, podendo ser confundido com um insucesso no tratamento endodôntico e até mesmo com doença periodontal. Objetivo: descrever as características clínicas, radiográficas e tomográficas em dentes com suspeita de fratura radicular. Métodos: a amostra foi composta por seis indivíduos cujos dados clínicos foram coletados, realizados testes de percussão vertical e horizontal, verificando se o dente apresentava mobilidade dentária e bolsa periodontal. Achados radiográficos e tomográficos foram avaliados em relação à presença de fratura radicular e de lesão periapical e/ou perda óssea associada ao terço apical/lateral da raiz para se obter o diagnóstico complementar da fratura radicular. Resultados: os achados clínicos mais prevalentes foram percussões vertical e horizontal positivos seguidos de dor e mobilidade. Os exames por imagem evidenciaram que todos os casos de suspeita de fratura radicular estavam relacionados a dentes com pino metálico. Em apenas um caso, não foi possível visualizar a lesão periapical e/ou perda óssea e a fratura na radiografia periapical, sendo detectadas nas imagens tomográficas. Conclusões: os achados clínicos de suspeita de fraturas radiculares são muito variáveis, necessitando correlacioná-los com exames de imagem. A TCFC se mostrou mais eficaz que a radiografia periapical na detecção da linha de fratura, porém esses dois exames podem ser utilizados para complementar o exame clínico e alcançar um diagnóstico mais acurado..


Introduction: the diagnosis of dental fracture is usually difficult because there are no pathognomonic clinical signs/symptoms and radiographic characteristics, and may be mistaken for failure of endodontic treatment and even periodontal disease. Purpose: to describe clinical, radiographic and tomographic characteristics in teeth with suspected root fracture. Methods: the sample consisted of 06 individuals and their clinical data were collected. Vertical and horizontal percussion tests were performed, verifying tooth mobility and periodontal pocket. In relation to radiographic and tomographic findings, the presence of root fracture and periapical lesion and/or bone loss associated with the apical/lateral third of the root were evaluated in order to obtain the diagnosis of root fracture. Results: the most prevalent clinical findings were positive vertical and horizontal percussions followed by pain and mobility. Imaging tests showed that all cases of suspected root fracture were related to teeth with metallic post. In only one case, it was not possible to visualize the periapical lesion and/or bone loss and fracture in the periapical radiography, being detected in tomographic images. It`s possible to conclude with the analysis of some clinical cases that cone-beam computed tomography favors accuracy and precision regarding the visualization, location and extension of root fracture, as well as periapical alterations. Conclusions: the clinical findings of suspected root fractures are very variable, requiring to correlate them with imaging exams. The CBCT was more effective than the periapical radiography in the detection of the fracture line, but these two exams can be used to complement the clinical examination and reach a more accurate diagnosis.


Subject(s)
Radiography, Dental , Endodontics , Cone-Beam Computed Tomography
3.
Dental press j. orthod. (Impr.) ; 22(4): 70-76, July-Aug. 2017. tab, graf
Article in English | LILACS | ID: biblio-891087

ABSTRACT

ABSTRACT Introduction: Due to the increasing use of miniplates for anchorage purposes in orthodontics, it is very important to know more about infrazigomatic crest anatomy (thickness), in adult patients. Objectives: Evaluate the infrazygomatic crest region thickness, in adult (male and female) patients. Methods: Cone-beam computerized tomography (CBCT) images from 40 patients were used to assess cross-sectional measurements of the infrazygomatic crest region. Measurement 1 considered thickness 2 mm above the distobuccal root of the permanent maxillary first molar, while measurement 2 was taken 2 mm above the first measurement. Results: The mean thickness of the infrazygomatic crest in males was 3.55 mm for measurement 1 and 2.84 mm for measurement 2, while in females these were 2.37 mm and 2.24 mm, respectively. Conclusion: The authors concluded that the overall mean thickness of the infrazygomatic crest was 2.49 mm with respect to measurement 1, and 2.29 mm for measurement 2, with no statistically significant differences between gender.


RESUMO Introdução: devido ao aumento do uso de miniplacas para ancoragem em Ortodontia, torna-se de fundamental importância compreender melhor a anatomia da crista infrazigomática (espessura) em pacientes adultos. Objetivos: avaliar a espessura da crista infrazigomática em pacientes adultos (sexos feminino e masculino). Métodos: foram utilizadas tomografias computadorizadas de feixe cônico (TCFC) de 40 pacientes, para avaliar medidas da região da crista infrazigomática, no sentido transversal. A Medida 1 verificou a espessura mm acima da raiz distovestibular do primeiro molar permanente superior, enquanto a Medida 2 foi realizada 2 mm acima da primeira medida. Resultados: a espessura média da crista infrazigomática encontrada no sexo masculino foi de 3,55 mm para a Medida 1 e de 2,84 mm para a Medida 2, e no sexo feminino foi de 2,37 mm e de 2,24 mm, respectivamente. Conclusão: os autores puderam constatar que a espessura média da crista infrazigomática foi de 2,49 mm para a Medida 1, e de 2,29 mm para a Medida 2, sem diferença estatisticamente significativa entre os sexos.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Young Adult , Zygoma/anatomy & histology , Zygoma/diagnostic imaging , Orthodontic Anchorage Procedures/instrumentation , Orthodontic Anchorage Procedures/methods , Cone-Beam Computed Tomography , Bone Plates , Radiography, Dental , Equipment Design
4.
Rev. cuba. estomatol ; 53(2): 67-70, abr.-jun. 2016. ilus
Article in English | LILACS | ID: lil-784998

ABSTRACT

The nasopalatine canal is a long slender structure present in the midline of the anterior maxilla that connects the palate to the floor of the nasal cavity. The nasopalatine canal contains the nasopalatine nerve, the terminal branch of the nasopalatine artery, fibrous connective tissue, adipose tissue, and minor salivary glands. The purpose of this article was to report a case of a trifid nasopalatine canal detected by cone beam computed tomography prior to dental implant placement. A 47-year-old female patient was submitted to cone beam computed tomography. Axial and sagittal sections revealed a trifurcation of the nasopalatine canal. Each canal was separated from the other by bony septa and extended independently from the floor of the nasal cavity to the incisive foramen in the remnant of the alveolar process in the anterior region of the maxilla. Cone beam computed tomography has permitted better visualization of the details and anatomical variations of the nasopalatine canal. Detailed knowledge of variations in the shape, number and size of the nasopalatine canal is fundamental for surgical procedures, such as local anesthesia in the anterior maxillary region and placement of dental implants, in order to prevent damage to important arteries and nerves(AU)


El canal nasopalatino es una larga estructura delgada presente en la línea media del maxilar anterior que conecta el palato al suelo de la cavidad nasal. El canal nasopalatino contiene el nervio nasopalatino, la rama terminal de la arteria nasopalatina, el tejido conectivo fibroso, el tejido adiposo y las glándulas salivales menores. El propósito de este artículo es presentar el caso de un canal nasopalatino trifid detectado a través de tomografía computarizada de haz cónico anterior a la colocación de implantes dentales, en una paciente de femenino 47 años de edad. Secciones axiales y sagitales revelaron la trifurcación del canal nasopalatino. Cada canal se apartó del otro por tabiques ósea y extendida independientemente del suelo de la cavidad nasal para el agujero incisivo en el remanente del proceso alveolar en la región anterior del maxilar. La tomografía computarizada de haz cónico ha permitido una mejor visualización de los detalles y variaciones anatómicas del canal nasopalatino. El conocimiento detallado de las variaciones en su forma, el número y el tamaño del canal nasopalatino es fundamental para los procedimientos cirúrgicos, así como la anestesia local en la región anterior del maxilar superior y la colocación de los implantes dentales, con el fin de prevenir el daño a las arterias y a los nervios importantes(AU)


Subject(s)
Humans , Female , Middle Aged , Anatomic Variation , Cone-Beam Computed Tomography/methods , Dental Implants/adverse effects , Nasal Cavity/diagnostic imaging
5.
Braz. j. oral sci ; 14(3): 214-218, July-Sept. 2015. tab, graf
Article in English | LILACS, BBO | ID: lil-770535

ABSTRACT

Abstract Aim: To evaluate canal transportation and centering ability of Protaper and WaveOne systems in curved root canals by cone-beam computed tomography. Methods: Twenty human molars were randomly divided into two groups according to the system used: Group GP (ProTaper Universal(r)) and group GW (WaveOne(tm)). CT scans were performed before and after the chemo-mechanical preparation on three points: 2 mm, 3 mm and 4 mm from the tooth apex. The cuttings in dentin were measured and results were statistically analyzed. Results: In GP, there was higher percentage in transport at 2 mm and 4 mm toward the mesial wall of the tooth root compared to GW (p<0.05). There was no difference between the systems regarding their centering ability. Conclusions: None of the systems was able to touch all the dentin walls and stay centered during the chemical-mechanical preparation.


Subject(s)
Root Canal Preparation , Endodontics , Cone-Beam Computed Tomography
6.
ImplantNews ; 12(3): 335-341, 2015. ilus, tab
Article in Portuguese | LILACS, BBO | ID: lil-759665

ABSTRACT

O objetivo deste artigo foi realizar uma revisão da literatura demonstrando o impacto do biótipo gengival na composição estética e funcional das reabilitações com implantes na região anterior da maxila. O biotipo tecidual ao redor de implantes pode ser classificado como fino ou espesso. Estes biotipos estão associados a diferentes características clínicas, podendo resultar em comportamentos divergentes pós-tratamento com implantes. O biotipo gengival espesso está relacionado com menores índices de complicações estéticas, como a recessão, e maior estabilidade óssea. Desta forma, o diagnóstico do biotipo tecidual durante a fase de planejamento deverá ser inserido na rotina clínica, devendo ser selecionado um método de diagnóstico eficaz, reprodutível, pouco oneroso e pouco invasivo. A partir de um correto diagnóstico, existe a possibilidade da conversão do biotipo fino para espesso através de técnicas cirúrgicas de manejo do tecido mole e da prótese. Portanto, o diagnóstico e a conversão de biotipos finos poderão resultar em maior previsibilidade estético-funcional das reabilitações implantossuportadas.


The tissue biotype around implants can be classifi ed as thin or thick. These biotypes are associated with different clinical characteristics and may result in different behaviors after treatment with implants. The thick gingival biotype is associated with lower rates of aesthetic complications, as well as recession and increased bone stability. Thus, the diagnosis of tissue biotype during the planning phase should be inserted in the clinical routine and it must be an effective, reproducible, inexpensive and less invasive method. From a correct diagnosis, a conversion from thin to thick biotype through surgical techniques and soft tissue prosthesis management is possible. Therefore, diagnosis and conversion of thin biotypes may result in greater aesthetic and functional predictability of implant restorations.


Subject(s)
Humans , Connective Tissue , Dental Implantation , Diagnosis , Gingiva , Mouth Rehabilitation
7.
Braz. j. oral sci ; 11(2): 94-99, abr.-jun. 2012. ilus
Article in English | LILACS, BBO | ID: lil-654827

ABSTRACT

Aim: The aim of this study was to investigate the measurements of the mandibular canal in differentpatterns of reabsorbed alveolar ridges, using multidetector computed tomography in order toevaluate the relationship of the mandibular canal with the cortex of the mandible remains. Methods:Central cross-sectional slice of 30 edentulous alveolar ridges in the mandibular first molar regionof otherwise healthy patients using multidetector computed tomography were analyzed. Horizontaland vertical lines were performed tangent to the corticals of the mandible and mandibular canal.Fisher’s exact test, Spearman test and linear regression were used for statistical analysis.Significance level for all statistical tests was 95%. Results: The height of the mandible and thedistance of mandibular canal to superior cortical in males were significantly higher when comparedwith females (p<0.05). When the height of the mandibular bone was correlated to the classificationof edentulous jaws, significant differences were observed when comparing the three types (III, IVand V) as well as between III and IV type. Conclusions: The results of the present study showthat the measurements for dental implant placement in the posterior region of the mandible areaffected by the different patterns of bone resorptions. It was also demonstrated the importance ofthe computed tomography in the process of planning dental implant placements.


Subject(s)
Bone and Bones , Mandible
8.
J. appl. oral sci ; 19(5): 462-468, Sept.-Oct. 2011. ilus, tab
Article in English | LILACS | ID: lil-600846

ABSTRACT

OBJECTIVES: The aim of this study was to evaluate the detection of enamel-dentin occlusal caries using photostimulable phosphor plates. MATERIAL AND METHODS: The ability to detect enamel-dentin occlusal caries in 607 premolars and molars from 47 patients between 10 and 18 years old, referred to the School of Dentistry of the Federal University of Bahia, Brazil, was evaluated based on clinical and radiographic examinations, using the criteria proposed in a previous study. A total of 156 bitewing digital images were obtained using Digora® (Soredex Medical Systems, Helsinki, Finland) phosphor plates. The plates were scanned and the images were captured and displayed on a computer screen. Image evaluation was done using Digora® for Windows 2.1 software, Soredex®. The radiologists were allowed to use enhancement tools to obtain better visibility during scoring of the teeth based on the radiographic criteria proposed in a previous study. Descriptive analysis and chi-squared proportion tests were done at 5 percent significance level. RESULTS: The results of clinical examination showed a higher prevalence of teeth with a straight dark line or demineralization of the occlusal fissure (score 1) and a lower prevalence of sealed teeth (score 5). In the bitewing digital images, 47 teeth presented visible radiolucency, circumscribed, in dentin under occlusal enamel (enamel-dentin caries lesions). CONCLUSIONS: Correlating the clinical and radiographic findings, it was found that in the majority of teeth diagnosed by radiographic images as having enamel-dentin caries, no caries could be detected by clinical examination.


Subject(s)
Adolescent , Child , Female , Humans , Male , Dental Caries , Phosphorus , Radiography, Dental, Digital/methods , Age Distribution , Chi-Square Distribution , Dental Enamel/pathology , Dental Enamel , Dentin/pathology , Dentin , Image Processing, Computer-Assisted/methods , Radiography, Bitewing , Reproducibility of Results , Sex Distribution , Surface Properties
9.
Rev. cir. traumatol. buco-maxilo-fac ; 11(3): 43-48, Jul.-Set. 2011. ilus
Article in Portuguese | LILACS | ID: lil-792207

ABSTRACT

Os odontomas são classificados como tumores benignos, originados do epitélio e do ectomesênquima odontogênico e são considerados mais anomalias de desenvolvimento - hamartomas - do que verdadeiras neoplasias. Representam, sem dúvida, os tumores mais comumente observados entre todos aqueles de origem odontogênica. Sua etiopatogenia constitui um aspecto muito investigado, embora se apresente indeterminada, ficando restringida ao campo das hipóteses, indo desde traumatismos e infecções locais a fatores genéticos. São mais frequentemente diagnosticados na segunda década de vida. Frequentemente, encontram-se inclusos e assintomáticos e geralmente são descobertos em radiografias de rotina, sendo vistos como uma massa intensamente radiopaca, circundada por linha radiolúcida. Raramente ocorre sua irrupção em cavidade oral, e existem algumas teorias que tentam explicá-la. O presente trabalho tem por objetivo apresentar um caso clínico de extenso odontoma irrompido em cavidade oral, discutindo aspectos relevantes do ponto de vista clínico-cirúrgico.


Odontomas are classified as benign tumors arising from epithelium and mesenchyme odontogenic and are considered more developmental abnormalities - Hamartoma - than true neoplasms. Undoubtedly, they are the most commonly tumors seen among those of odontogenic origin. Its pathogenesis is a very investigated, despite presenting indeterminate, being restricted to the realm of hypotheses, ranging from local infections and trauma to genetic factors. They are most frequently diagnosed in the second decade of life, often are included and asymptomatic, and usually are discovered in routine radiographs, being seen as an intensely radiopaque mass surrounded by a radiolucent line. Rarely it occurs eruption in the oral cavity and there are some theories that might explain it. This paper aims to present a case of extensive odontoma erupted into the oral cavity, discussing relevant aspects of the clinical surgery.

10.
Int. j. odontostomatol. (Print) ; 5(2): 199-202, Aug. 2011. ilus
Article in English | LILACS | ID: lil-608722

ABSTRACT

The aim of this study was to investigate the prevalence of supernumerary teeth in a Brazilian pediatric population. One examiner evaluated the presence of supernumerary teeth in panoramic radiographs of 1719 subjects (762 male and 957 female), with ages ranging from 4 to 14.5 years (mean 8.4 years old), from the archive of the Preventive Orthodontic Course of the Rehabilitation Hospital of Bauru, São Paulo. Supernumerary teeth were present in thirty subjects (1.7 percent, 16 males and 14 females). Difference between sexes was not statistically significant. Twenty-nine supernumerary teeth (96.7 percent) were located in the maxilla, and only 1 (3.3 percent) located in mandible. Seventeen supernumerary teeth (56.7 percent) located in maxilla were mesiodens. The early diagnosis of supernumerary teeth is essential to prevent malocclusion and malposition of permanent teeth demonstrating the importance of panoramic radiographs in their detection.


El objetivo de este estudio fue investigar la prevalencia de dientes supernumerarios en una población pediátrica de Brasil. Un examinador evaluó la presencia de dientes supernumerarios en radiografías panorámicas de 1719 sujetos (762 hombres y 957 mujeres), con edades comprendidas entre 4 y 14,5 años (media 8,4 años de edad), del archivo del Curso de Ortodoncia Preventiva del Hospital de Rehabilitación de Bauru, São Paulo. Los dientes supernumerarios se presentaron en treinta sujetos (1,7 por ciento, 16 hombres y 14 mujeres). La diferencia entre sexos no fue estadísticamente significativa. Veintinueve dientes supernumerarios (96,7 por ciento) se ubicaron en el maxilar, y sólo 1 (3,3 por ciento) se ubicó en la mandíbula. Diecisiete dientes supernumerarios (56,7 por ciento) ubicados en el maxilar eran mesiodens. El diagnóstico precoz de los dientes supernumerarios es esencial para prevenir la maloclusión y malposición de los dientes permanentes, lo que demuestra la importancia de la radiografía panorámica en su detección.


Subject(s)
Humans , Male , Adolescent , Female , Child, Preschool , Child , Tooth, Supernumerary/epidemiology , Tooth, Supernumerary , Brazil/epidemiology , Prevalence , Radiography, Panoramic , Sex Distribution
11.
Rev. paul. odontol ; 33(1): 17-20, jan.-mar. 2011. tab
Article in Portuguese | LILACS, BBO | ID: lil-600409

ABSTRACT

O objetivo deste estudo foi investigar a prevalência de tamanho e número, mediante exame em radiografia panorãmica de pacientes ortodônticos. Foram avaliadas 1719 radiografias panorãmicas dos prontuários do arquivo dos pacientes do Curso de Aperfeiçoamento de Ortodontia Preventiva e Interceptativa do Hospital de Reabilitação de Bauru...


The aim of this study was to investigate the prevalence of size and number abnormalities in panoramic radiographis of orthodontic patients. 1719 panoramic radiographs of orthodontic patients of the Preventive and Interceptive Orthodontics Course of the Rehabilitation Hospital of Bauru were used...


Subject(s)
Anodontia , Tooth Abnormalities , Tooth, Supernumerary , Radiography, Panoramic
12.
Dental press j. orthod. (Impr.) ; 15(5): 42-43, set.-out. 2010. tab
Article in Portuguese | LILACS | ID: lil-562896

ABSTRACT

OBJETIVO: o objetivo deste estudo reside na avaliação do produto dose-área (DAP) e das doses de entrada na pele (DEP), empregando protocolos com tamanho de voxel diferente, obtidos com o aparelho de Tomografia Computadorizada de Feixe Cônico (TCFC) i-CAT, a fim de determinar melhores parâmetros baseados nos princípios da radioproteção. MÉTODOS: para medição do DEP foi utilizada uma câmara de ionização do tipo lápis, e para o DAP foi utilizado um aparelho PTW. Quatro protocolos foram testados, a saber: (1) 40 seg., voxel de 0,2mm e 46,72mAs; (2) 40 seg., voxel de 0,25mm e 46,72mAs; (3) 20 seg., voxel de 0,3mm e 23,87mAs; (4) 20 seg., voxel de 0,4mm e 23,87mAs. A quilovoltagem permaneceu constante (120KVp). RESULTADOS: detectou-se diferença estatisticamente significativa (p<0,001) entre os quatro protocolos, para os dois métodos de avaliação da dose de radiação (DAP e DEP). Na avaliação do DAP, os protocolos 2 e 3 promoveram uma diferença estatisticamente significativa, não sendo possível detectar qual dos protocolos na avaliação da DEP proporcionou esse resultado. CONCLUSÃO: DAP e DEP apresentam-se como métodos de avaliação para doses de radiação em tomografia computadorizada de feixe cônico, sendo necessários mais estudos para elucidar tal achado. O tamanho do voxel, isoladamente, não é capaz de interferir na dose de radiação em exames de TCFC (i-CAT). A dose de radiação para exames de TCFC (i-CAT) está diretamente relacionada ao tempo de exposição e à miliamperagem.


Objectives: The aim of this study was to evaluate the dose-area product (DAP) and the entrance skin dose (ESD), using protocols with different voxel sizes, obtained with i-CAT Cone-Beam Computed Tomography (CBCT), to determine the best parameters based on radioprotection principles. METHODS: A pencil-type ionization chamber was used to measure the ESD and a PTW device was used to measure the DAP. Four protocols were tested: (1) 40s, 0.2 mm voxel and 46.72 mAs; (2) 40s, 0.25 mm voxel and 46.72 mAs; (3) 20s, 0.3 mm voxel and 23.87 mAs; (4) 20s, 0.4 mm voxel and 23.87 mAs. The kilovoltage remained constant (120kVp). RESULTS: A significant statistical difference (p<0.001) was found among the four protocols for both methods of radiation dosage evaluation (DAP and ESD). For DAP evaluation, protocols 2 and 3 presented a statistically significant difference, and it was not possible to detect which of the protocols for ESD evaluation promoted this result. CONCLUSIONS: DAP and ESD are evaluation methods for radiation dose for Cone-Beam Computed Tomography, and more studies are necessary to explain such result. The voxel size alone does not affect the radiation dose in CBCT (i-CAT) examinations. The radiation dose for CBCT (i-CAT) examinations is directly related to the exposure time and milliamperes.


Subject(s)
Cone-Beam Computed Tomography , Radiation Exposure Measurement
13.
RPG, Rev. Pós-Grad ; 17(3): 173-176, jul.-set. 2010. ilus
Article in English | LILACS, BBO | ID: biblio-855265

ABSTRACT

Forame mentual acessório: relato de caso. Variações anatômicas associadas ao forame mentual são relativamente incomuns. Dentre tais variações, a presença de um ou mais forames mentuais acessórios tem sido relatada em raros casos. O conhecimento da sua localização em relação ao forame mentual principal é de fundamental importância na avaliação prévia de procedimentos cirúrgicos e endodônticos. Neste artigo, um caso de forame mentual acessório foi apresentado através de imagens por tomografia computadorizada, e as principais complicações relacionadas a essa variação anatômica são discutidas


Subject(s)
Humans , Female , Adolescent , Anatomy, Cross-Sectional , Mandible , Tomography, Spiral Computed , Bicuspid , Mandibular Nerve , Therapeutics
14.
Braz. j. oral sci ; 9(1): 59-62, Jan.-Mar. 2010. ilus
Article in English | LILACS, BBO | ID: lil-578049

ABSTRACT

Periostitis ossificans (PO) is a type of chronic osteomyelitis, an inflammation of cortical and cancellous bone. In the maxillo facial region, the mandible is most frequently affected. The cause of inflammatory subperiosteal bone production in PO is spread of infection from a bacterial focus (e.g.: odontogenic disease, pulpal or periodontal infection, and extraction wounds). This pathology is most commonin younger people (mean age of 13 years). Conventional radiographs are one of the most usefultools for diagnosis, but in some cases computed tomography (CT) has a key role in both diagnosis and identification of the tissues involved. This paper reports two cases of PO in which CT help edestablishing the suspicious etiology: a 12-year-old boy with PO of pulpal origin and a 14-year-old boy with PO of periodontal origin.


Subject(s)
Humans , Male , Child , Chronic Disease , Osteomyelitis/diagnosis , Periostitis/diagnosis , Tomography Scanners, X-Ray Computed , Osteomyelitis/etiology , Periostitis/etiology
15.
RPG rev. pos-grad ; 15(4): 251-254, out.-dez. 2008. ilus
Article in English | LILACS | ID: lil-556111

ABSTRACT

The case of a 41-year-old female patient who did not complain of articular pain or clicking (even past clicks) is herein presented. History of relevant diseases, local trauma, or temporomandibular joint surgery were not reported. Clinically, the patient presented jaw opening limitation with deflection of the mandible to the right side without correction of the trajectory at the end of the jaw opening movement. The imaging features led to the diagnosis of partial posterior displacement and adhesion of the disk to the condyle on both sides; as well as condylar hypomobility and apparent adhesion of the disk to the temporal component on the right side. This particular case is probably the first case of bilateral TMJ posterior disk displacement and adhesion to the condyle reported in literature.


Subject(s)
Humans , Female , Adult , Magnetic Resonance Spectroscopy , Temporomandibular Joint Disc , Mandibular Condyle , Temporomandibular Joint
16.
Rev. imagem ; 29(2): 79-82, abr.-jun. 2007. ilus, tab
Article in Portuguese | LILACS | ID: lil-542031

ABSTRACT

Relatamos um caso de adesão bilateral do disco associada a hipoplasia do côndilo da articulação temporomandibular acometendo paciente de 17 anos de idade, sexo masculino, com queixa de dor e limitação progressiva de abertura de boca, nos últimos dois anos. O paciente não referia ruídos articulares de qualquer natureza e, clinicamente, apresentava limitação de abertura de boca, com desvio à esquerda sem correção da trajetória ao final do movimento mandibular. Nossa impressão diagnóstica foi de adesão do disco articular (ôfenômeno do disco ancoradoõ) e hipomobilidade do côndilo direito, e adesão do disco articular, hipoplasia e hipomobilidade do côndilo esquerdo.


We report a case of a 17-year-old male patient presenting bilateral disk adhesion associated with condylar hypoplasia on the left side. The patient was complaining of articular pain on both sides and progressive jaw open limitation over the previous two years.The patient did not report articular noise and, clinically, presented jaw opening limitation, with deflection of the mandible to the left side without correction of the trajectory at the end of the jaw opening movement. Our diagnostic impression was: disk adhesion(ôanchored disc phenomenonõ) and limitation of the condyle translation, for the right side, and disk adhesion, condylar hypoplasia, and limitation of the condyle translation, for the left side.


Subject(s)
Humans , Male , Adolescent , Mandibular Condyle/pathology , Temporomandibular Joint Disc/pathology , Magnetic Resonance Spectroscopy
17.
Periodontia ; 14(1): 51-57, mar. 2004. ilus, tab
Article in Portuguese | LILACS, BBO | ID: lil-500835

ABSTRACT

O conhecimento do estado de normalidade das estruturas periodontais deve nortear o diagnóstico radiográfico no reconhecimento do patológico e no conseqüente estabeIecimento de critérios para a preservação. Dentre os avanços tecnológicos surgidos recentemente, as imagens digitais diretas e semidiretas têm se mostrado úteis no diagnostico, particularmente no diagnóstico periodontal. Este u3balho se propôs a avaliar a imagem radiográfica das estruturas ósseas alveolares, representadas pelo osso alveolar da crista óssea (CA), osso alveolar interproximal e da região Interradicular de molares e pré-molares permanentes inferiores. com diagnóstico clínico de ausência de doença penodontal, através de radiografias digitais semi-diretas pelo sistema DentScan-DentView. Foram indiretamente digltalizadas 32 radiografias interproximais horizontais e vertlcais, da região de molares e pré-molares inferiores. Os valores do coeficiente de atenuação da CA, osso alveolar interproximal e da região de turca, entre si e entre as técnicas Interproximais aplicadas, obtiveram uma correlação estatisticamente significante. O osso alveolar interproximal apresentou maior valor do coeficiente de atenuação que o correspondente sítio da CA, e o osso alveolar interradicular registrou maiores valores que o osso alveolar interproximal. 1mbos os resultados demonstrando uma alta correlação estatisticamente significativa, inclusive entre as técnicas Interproximais vertical e horizontal.


Subject(s)
Humans , Male , Female , Bone Density , Mandible , Radiography, Dental, Digital
18.
Pesqui. odontol. bras ; 17(2): 176-82, Apr.-Jun. 2003. ilus, tab, graf
Article in Portuguese | LILACS, BBO | ID: biblio-872371

ABSTRACT

Esta pesquisa teve por objetivo avaliar a relação entre o valor do ângulo horizontal do côndilo (AHC) e o desarranjo interno (DI), por interferência do disco da articulação temporomandibular (ATM), de indivíduos indicados para exame por ressonância magnética (RM). A amostra perfez um total de 144 ATMs (cortes sagital e coronal) de 72 indivíduos, na faixa etária de 15 a 70 anos, 15 do gênero masculino e 57 do gênero feminino. Os exames foram procedidos em um sistema modelo Signa (GE), magnitude de 1,5 T para o campo magnético. Sessenta e oito ATMs apresentaram uma condição de normalidade e 46 apresentaram deslocamento anterior do disco articular com redução. Dessas, 41 expressaram algum tipo de alteração adaptativa no côndilo e cinco, alterações degenerativas. Vinte e nove articulações mostraram deslocamento anterior do disco articular sem redução, sendo que 12 dessas apresentaram alterações adaptativas do côndilo e 17, alterações degenerativas. Foi registrado apenas um caso de deslocamento posterior do disco articular. O valor médio encontrado para o AHC do lado direito foi de 22,09º e para o lado esquerdo foi de 21,47º, para aquelas ATMs que se apresentaram em condições de normalidade. Para as ATMs com deslocamento de disco, esses valores foram de 24,69º para o lado direito e 22,94º para o lado esquerdo. Desse modo, foi-nos possível concluir que existe uma tendência ao aumento do AHC nas ATMs com DI. Observamos forte associação, para as ATMs contralaterais, entre os valores do AHC (57,8 por cento), condição de normalidade (69,7 por cento) e DI (66,7 por cento). E, corroborando esses resultados, registramos correlação para os valores dos AHC contralaterais (63,31 por cento) e o diagnóstico para as ATMs contralaterais (68,05 por cento). Assim, pudemos inferir que existe tendência das ATMs contralaterais apresentarem as mesmas características e condições


This research aimed at assessing the relation between the horizontal condylar angle (HCA) and the internal derangement (ID) of the temporomandibular joint (TMJ), as a result of interference by the TMJ disk, in individuals undergoing magnetic resonance (MR) scans. The sample included a total of 144 TMJs (sagittal and coronal views) of 72 subjects, 15 of whom were male and 57 female, with ages ranging from 15 to 70. The scans were made in a Signa system (GE) model at a magnetic field magnitude of 1.5 T. Sixty-eight TMJs were found to be normal, while 46 showed anterior displacement with reduction. Of these, 41 had some kind of adaptive change in the condyle, while 5 showed degenerative changes. Anterior displacement without reduction was found in 29 joints, 12 of which showed adaptative changes in the condyle, while 17 showed degenerative changes. Only one posterior displacement of the articular disk was recorded. For the TMJs in which disk displacement was found, such values achieved 24.69º on the right side, and 22.94º on the left side. Hence, it was possible for us to conclude that the HCA tends to increase in those TMJs where ID is present. For contralateral TMJs, a strong association was observed between HCA values (57.8 percent), state of normality (69.7 percent), and ID (66.7 percent). To corroborate such findings, a correlation between contralateral HCA values (63.31 percent) and the diagnosis for contralateral TMJs (68.05 percent) was determined. Thus, we could infer that there is a tendency between contralateral TMJs to share characteristics and conditions


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Temporomandibular Joint Disorders/diagnosis , Temporomandibular Joint Disc/physiopathology , Mandibular Condyle/physiology , Temporomandibular Joint , Temporomandibular Joint Disc , Magnetic Resonance Spectroscopy , Magnetic Resonance Imaging
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