Avaliação da sensibilidade entre a radiografia digital periapical direta e a tomografia computadorizada de feixe cônico, no diagnóstico de reabsorções radiculares simuladas em ex-vivo / Comparative evaluation of different systems digital imaging in the detection of simulated external root resorption. Study on ex-vivo

O objetivo deste trabalho e de comparar a radiografia digital com a tomografia computadorizada de feixe cônico e a tomografia computadorizada helicoidal multislice no diagnóstico de reabsorções radiculares. Foram utilizadas 25 mandíbulas suínas, com 90 simulações de reabsorções realizadas com fresas de número », ½ e 1 distribuídas uniformemente pelos três terços. Após a realização dos exames radiográficos e tomográficos, as imagens foram analisadas por três examinadores. Obtivermos como resultado que a Tomografia computadorizada de feixe cônico identificou 85,18%, a tomografia computadorizada helicoidal multislice identificou 87,77% e a radiografia digital identificou apenas 45,92% das reabsorções. Concluímos que a tomografia computadorizada de feixe cônico e a tomografia computadorizada helicoidal multislice foram estatisticamente superior a radiografia digital. A tomografia computadorizada helicoidal multislice e a tomografia computadorizada de feixe cônico não houve diferença estatisticamente insignificante.

The objective of this work and to compare the digital x-ray with the cone-beam computerized tomography and the multislice spiral computerized tomography in the diagnosis of external root resorption The 25 pigs jaws had been used, with 90 simulations of external root resorption carried through with round burs sizes of number », ½ and 1 distributed uniformly for the three sites After the accomplishment of the radiography and tomography images, the images had been analyzed by three examiners. To get as resulted that the cone-beam computerized tomography identified 85.18%, the multislice spiral computerized tomography identified 87.77% and the digital x-ray identified only 45.92% of the external root resorptions. We conclude that the cone-beam computerized tomography and the multislice spiral computerized tomography had been statistical superior the digital x-ray. The multislice spiral computerized tomography and the cone-beam computerized tomography did not have statistical insignificant difference

Influence of shaft design on the shaping ability of 3 nickel-titanium rotary systems by means of spiral computerized tomography.

OBJECTIVE: To evaluate the influence of shaft design on the shaping ability of 3 rotary nickel-titanium (NiTi) systems. STUDY DESIGN: Sixty curved mesial canals of mandibular molars were used. Specimens were scanned by spiral tomography before and after canal preparation using ProTaper, ProFile, and ProSystem GT rotary instruments. One-millimeter-thick slices were scanned from the apical end point to the pulp chamber. The cross-sectional images from the slices taken earlier and after canal preparation at the apical, coronal, and midroot levels were compared. RESULTS: The mean working time was 137.22 +/- 5.15 s. Mean transportation, mean centering ratio, and percentage of area increase were 0.022 +/- 0.131 mm, 0.21 +/- 0.11, and 76.90 +/- 42.27%, respectively, with no statistical differences (P> .05). CONCLUSIONS: All instruments were able to shape curved mesial canals in mandibular molars to size 30 without significant errors. The differences in shaft designs seemed not to affect their shaping capabilities.

Avaliação comparativa de diferentes meios para o diagnóstico em endodontia / Comparative evaluation of three half ones for diagnosis in endodontic

O objetivo deste trabalho foi avaliar comparativamente três meios de diagnóstico em endodontia utilizando a radiografia convencional, radiografia digital indireta e a tomografia computadorizada helicoidal. Para tanto foram selecionados 20 casos clínicos onde já haviam realizado os exames radiográficos, tomográficos e exame macroscópico para a comprovação clínica. Foram selecionados três examinadores para a avaliaçao das radiografias convencionais e digitais com a finalidade de elaborarem um diagnóstico clínico. Após essa elaboração o diagnóstico somado ao diagnóstico tomográfico estes foi confrontado com o macroscópico para a comparação. A conclusão obtida foi em ordem decrescente, tomografia computadorizada helicoidal, radiografia digital e por último a radiografia convencional

The objective of this work was to evaluate comparativity three ways of diagnosis in endodontia using the conventional x-ray, indirect digital x-ray and the computadorized cat scan helical. For 20 cases had been in such a way selected clinical where already they had carried through the radiographic, tomographic examinations and macroscopic examination for the clinical evidence. Three examiners for the evaluation of the conventional and digital x-rays with the purpose had been selected to elaborate a clinical diagnosis. After this elaboration the diagnosis added to the tomographic diagnosis these was collated with the macroscopic one for the matching. The gotten conclusion was orderly decreasing, computerized cat scan helical, digital x-ray and finally the conventional x-ray