Radiographic image analysis of apicetomized roots irradiated with Nd:YAG laser using imaging processing of direct digital radiographs / Análise da imagem radiográfica de raízes apicetomizadas e irradiadas com laser de Nd:YAG por meio do processamento de imagem de radiografias digitais diretas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

In this research, we carried out an evaluation of the digital radiographic image of dental root-ends irradiated with Neodymium Yttrium Aluminum Garnet (Nd:YAG) laser after apical resection. With the intention of founding alterations in the digital radiographic image of the roots caused by laser irradiation, we developed an in vitro experimental model. We made apicectomy in 39 single-root teeth, 2 milimeters below the apical limit and then we fixed these teeth in a standardization device. The radiographic images were captured thru a direct digital radiographic system (Dixi® Planmeca). After positioning of the teeth in the standardization device, we made an initial radiograph, Nd:YAG laser irradiation of the apex and a final radiograph, without manipulation of the standardized system during the whole process. The laser parameters applied in this research followed the clinical research protocol for apical surgeries developed in the LELO- FOUSP. They were 100mJ, 15Hz, 1,5W and a 320m diameter optic fiber. The radiographs were made within three different exposure times (0,05s, 0,08s and 0,14s). The obtained 12 bit radiographic images before and after laser irradiation were converted to 8 bit images and exported to the ImageTool 3.0.0 image analysis software. With this software wee analyzed the digital images in the methods of histogram analysis and quantitative digital image subtraction. The two methods indicated less amount of dentin in the apical surface after Nd:YAG laser irradiation. The variable exposure time did not present statistical differences. However, we observed a tendency of better performance of the methods with images obtained with 0,05s exposure time. Although we observed dental tissue ablation, it was not possible to detect the presence of a more radiopac dentin layer in the irradiated surface radiographic images.

ASSUNTO(S)

laser processamento de imagens apicectomia apicectomy image processing digital radiology laser radiologia digital

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