Ankylosis of Permanent First Molar: Diagnosis by Cone Beam Computed Tomography / Anquilosis del Primer Molar Permanente: Diagnóstico por Tomografía Computarizada con Haz Cónico

ABSTRACT: Ankylosis is an anomaly of tooth eruption characterized by the fusion of cementum and alveolar bone, and may affect from small regions to the entire root surface. Clinical assessment combined with imaging exams can aid diagnosis. Radiographic testing enables assessing only proximal regions of possibly affected roots. Whereas cone beam computed tomography (CBCT) allows a three-dimensional assessment of axial, coronal, and sagittal planes of all dental extension, eliminating thus overlapping images and helping to confirm the correct diagnosis. The present study contains a case report of a male patient with ankylosis in tooth 16 diagnosed by CBCT, aiming at providing information for dentists about this anomaly, its characteristics and situations in which CBCT should be indicated.

RESUMEN: La anquilosis es una anomalía de la erupción del diente caracterizada por la fusión de cemento y hueso alveolar, y puede afectar desde pequeñas regiones hasta toda la superficie de la raíz. La evaluación clínica combinada con los exámenes de imagen puede ayudar a diagnosticar esta anomalía. Las pruebas radiográficas permiten evaluar sólo las regiones proximales de las raíces posiblemente afectadas. La tomografía computarizada de haz de cono (CBCT) permite una evaluación tridimensional de los planos axial, coronal y sagital de toda la extensión dental, eliminando así las imágenes superpuestas y ayudando a confirmar el diagnóstico correcto. En el presente estudio se presenta un reporte de caso de un paciente con anquilosis en el diente 16 diagnosticado por CBCT, con el objetivo de proporcionar información para los dentistas sobre esta anomalía, sus características y situaciones en las que debe indicarse la CBCT.

Evaluation of the effect of different types of filling materials and techniques on the fracture resistance of the teeth [comparative in vitro study]

In order to evaluate the effect of different restorative materials and techniques on the fracture resistance of tooth, forty caries free single rooted premolars were divided equally into four groups [A, Considered as control the group, without cavity preparation], [B, MOD cavity preparation, filled with amalgam alone], [C, MOD cavity preparation, filled by amalgam with bonding and adhesive], [D, MOD cavity, filled by light cured composite with bonding]. Using Instron testing machine to evaluate the fracture resistance, the results were highly significant in difference between the control group and all other groups, [B and C] and [B and D], where it was non significant between [C and D]. From these findings and under the conditions of this study, one can conclude that the normal tooth tissues [enamel, dentine] provide the best resistance to fracture, while the amalgam material provide the least, Amalgam with adhesive and, composite with bond locate in between

Transmigration of mandibular second premolar in a patient with cleft lip and palate: case report

Disturbances involving abnormalities in tooth eruption are named ectopia. Transmigration is the name assigned to ectopia in the presence of teeth in areas distant from the alveolar process. Initial angulation of the tooth bud of the second premolar and premature loss of permanent mandibular 1st molars can influence the distal migration of the second premolar. Some studies have observed that ectopic teeth can be found in a variety of places around the oral cavity and also in other areas of the human body. There are records of teeth in the maxillary sinus, mandibular condyle, coronoid process, mandibular angle, orbit, palate, mentum and also the skin. The prevalence of tooth abnormalities is higher in children with cleft lip and palate compared to children without clefts. This paper presents a case report of migration of the mandibular left second premolar in a patient attending the Hospital for Rehabilitation of Craniofacial Anomalies of the University of São Paulo (HRAC/USP), Brazil. Migration of the mandibular left 2nd premolar was confirmed by 8 panoramic and 1 periapical radiographs obtained during patient's treatment between 1978 and 2002, which were available in the files of the Department of Dental Radiology of HRAC/USP. It can be assumed that distal migration of the mandibular left 2nd premolar is not associated with presence of cleft lip and palate; observation of these two events in a same patient is rare, since no similar reported cases were found in the literature.

Peripheral giant cell granuloma--a case report.

Peripheral giant cell granuloma is a lesion arising mainly from the connective tissue of gingiva or periosteum of alveolar ridge. A case of peripheral giant cell granuloma involving a deciduous molar and the succedaneous tooth is reported. The lesion was large and interfered with occlusion. Surgical excision of the lesion along with the deciduous first molar was done. The underlying permanent first premolar was also involved, and had to be removed. The importance of an adequate salivary flow and maintenance of oral hygiene in the prevention of such lesions is stressed.

Prevalência de hipersensibilidade dentinária cervical / Prevalence of cervical dentine hypersensitivity

O objetivo deste trabalho foi verificar, por amostragem, a prevalência e a distribuiçäo dos dentes com hipersensibilidade dentinária cervical, estudadas através de 267 pacientes em tratamento dental e examinadas aleatoriamente. O estudo clínico demonstrou que um entre cada seis pacientes em tratamento apresenta algum dente com sensibilidade. O adulto jovem é o mais predisposto ao surgimento de hipersensibilidade dentinária cervical, ocorrendo de forma semelhante em homens e mulheres. A face em que houve mais hipersensibilidade dentinária cervical foi a vestibular dos dentes examinados. Os dentes mais freqüêntemente afetados säo os pré-molares

Cisto folicular inflamatório: revisäo da literatura e relato de um caso / The inflammatory follicular cyst: review of literature and case related

Os autores realizaram uma revisäo da literatura sobre o cisto folicular inflamatório, enfocando etiologia, aspectos clínicos, radiográficos e de tratamento da lesäo. Foi relatado um caso envolvendo o segundo pré-molar inferior de uma paciente de 10 anos de idade