Tomographic evaluation of infrazygomatic crest for orthodontic anchorage in different vertical and sagittal skeletal patterns

Analysis of the anatomy of the region during preoperative planning is very important in order to minimize the risks of undesired movements in the supporting teeth or even damage to important structures such as the maxillary sinus. To the best of our knowledge, no study evaluated the relationship of these skeletal patterns with the anatomy of the infrazygomatic crest. The aim of this study was to evaluate the tomographic measurements of the infrazygomatic crest for placement of temporary anchorage devices in individuals with different vertical and sagittal skeletal patterns. The measurements were analyzed in three regions in the crest of 67 patients above the maxillary first molar: A slice in the long axis of the mesiobuccal root, a slice passing through the center of the furcation area of the tooth, and another slice in the long axis of the distobuccal root. In each of these slices five measurements of the thickness of the infrazygomatic crest were performed, with a difference of 1 mm between them. The sagittal skeletal pattern was determined by the ANB angle and the vertical skeletal pattern by the SN.GoGn angle. The bone thickness of the crest tended to decrease gradually in the apical direction. There was no difference between different vertical and sagittal skeletal patterns. The individual parameters did not have significant influence in the thickness of the infrazygomatic crest

El uso del análisis fractal en imaginología odontológica

El análisis fractal (AF) es un método matemático por el cual las estructuras biológicas irregulares y complejas pueden ser evaluadas. El resultado cuantitativo de este método es definido como la dimensión fractal (DF). Fractal es derivado del latín “fractus”, que significa “fracturado” o “quebrado”. El método fractal es diferente de la geometría convencional y puede ser utilizado para evaluar las formas semejantes en varias escalas. En Odontología, el principal objetivo de los métodos de AF consiste en la evaluación del patrón óseo de los maxilares y de la morfología de la arquitectura trabecular por medio de exámenes de imagen, esta herramienta cuantitativa permite al radiólogo predecir la calidad del tejido óseo, es decir, la densidad mineral ósea (DMO) en determinada región de interés 1,2

Multiple Stafne Bone Defects: A Rare Entity

Stafne bone defects (SBDs) are generally located in the lingual cortex, close to the mandibular angle. We report the occurrence of multiple SBDs in an asymptomatic patient, a 60-year-old man, referred to a radiology clinic to undergo examination for the purpose of implant planning. The case of multiple SBD presented here, probably the first reported in the literature, reinforces the hypothesis that some cases of SBD may be the result of a focal failure during the ossification of the mandible

Assessment of enamel-dentin caries lesions detection using bitewing PSP digital images

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% 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

Características radiográficas dos portadores de osteoporose e o papel do cirurgião-dentista no diagnóstico

Osteoporosis is a disease characterized by low bone mass and microarchitectural deterioration of bone tissue, leading to enhanced bone fragility and a consequent increase in fracture risk. Oral signs might be manifested by excessive alveolar ridge resorption, tooth loss, chronic destructive periodontal disease, referred maxillary sinus pain, or fracture. The diagnosis is based on bone mineral density as measured by dual energy X-ray absorptiometry. However, this method may not be of easy access in some countries. Then it has been proposed the use of oral radiography in the diagnosis, once they are habitually used in the planning of treatments. Many investigators have developed radiographic measures to evaluate osteoporotic manifestations in oral cavity, for example the Mandibular Cortical Index, Panoramic Mandibular Index and the technique described by Wical and Swoope. All this techniques use the basal area of the mandible posterior to the mental foramen as a standard area (smallest possible inter and intraindividual variations in anatomical size, shape, bone structure and function). Then the dentists may be able to refer patients to medical professionals for further examination on the basis of incidental findings on dental panoramic radiographs. Besides have access to bone quality, that is essential for a successful oral implant planning.A osteoporose é uma doença sistêmica dos ossos, caracterizada pela diminuição da massa óssea e deterioração da microarquitetura do tecido ósseo, o que leva a um aumento da fragilidade óssea e da susceptibilidade à fratura. Suas manifestações, na cavidade oral, são caracterizadas por: reabsorção do processo alveolar, perda dentária, doença periodontal crônica destrutiva, dores relacionadas ao seio maxilar ou fraturas. O principal método de diagnóstico da osteoporose é a densitometria óssea, embora esse exame seja de difícil acesso para a população, em alguns países. Sendo assim, propõe-se a utilização de radiografias panorâmicas dentárias nessa avaliação, já que elas costumam ser procedimentos de rotina na clínica odontológica. Vários pesquisadores propuseram índices para avaliar as alterações osteoporóticas na cavidade oral, a partir de radiografias panorâmicas, como o Índice da Cortical Mandibular, o Índice Panorâmico Mandibular e a Técnica proposta por Wical e Swoope. Todas essas técnicas avaliam a região basal da mandíbula, posterior ao forame mentual, por ser uma área que preenche os requisitos para que ocorra uma menor variação inter e intra-indivíduos em relação à anatomia, forma, estrutura óssea e função. Dessa forma, os dentistas, em geral, poderiam fazer um correto encaminhamento dos pacientes para um tratamento específico, além de ter acesso à qualidade óssea do paciente, que é de grande importância no planejamento de implantes dentários

Panoramic and skull imaging may aid in the identification of multiple myeloma lesions

The purpose of this study was to investigate the presence of punched-out lesions in craniofacial bones using three different radiographic protocols in a large cohort of patients. One hundred fifty-five MM patients were evaluated using panoramic and skull (frontal and lateral) radiographs, which were performed in all patients at the time of MM diagnosis. The diagnostic potential for detecting punched-out lesions was compared among the radiographic techniques. MM punched-out lesions were identified in 135 (87%) panoramic radiographs, 141 (91%) frontal and 144 (93%) lateral skull radiographs. Punched out-lesions were synchronously present in skull and jawbones in 129 (83.23 %) cases. The lesions were detected exclusively in skull in 18 (11.61%) cases and exclusively in jawbones in 6 (3.87%) cases. Punched out-lesion mainly affected the skull and the jawbones in a synchronous way (p<0.001) rather than separately. All investigated radiographic techniques (panoramic, frontal and lateral skull approaches) demonstrated high detection rates for MM punched-out lesions in craniofacial bones. Panoramic radiography may aid to the radiographic protocols to identify multiple myeloma bone lesions

Assessment of enamel-dentin caries lesions detection using bitewing PSP digital images

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% 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