Optimal parameters for lateral oblique radiographs of rat mandibles
Objective: To establish optimal exposure parameters for lateral oblique radiographs of rat mandibles using an intraoral X-ray machine. Methods: A positioning apparatus, previously tested for its reproducibility, was used to obtain radiographs of four heads of formaldehyde-preserved Wistar rats. Radi...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/115823 |
| Acceso en línea: | http://hdl.handle.net/10183/115823 |
| Access Level: | acceso abierto |
| Palabra clave: | Radiografia Mandíbula Ratos Wistar Odontologia Radiography Rats, Wistar Mandible X-ray film |
| Sumario: | Objective: To establish optimal exposure parameters for lateral oblique radiographs of rat mandibles using an intraoral X-ray machine. Methods: A positioning apparatus, previously tested for its reproducibility, was used to obtain radiographs of four heads of formaldehyde-preserved Wistar rats. Radiographs were exposed at 50 kV and 8 mA using four size 2 films (Insight, Ektaspeed Plus, Ultraspeed and D-Speed; Eastman Kodak Co., Rochester, NY), two focal distances (30 cm and 60 cm) and seven exposure times (0.6 s, 0.7 s, 0.8 s, 1.0 s, 1.5 s, 2.0 s and 2.5 s). The radiographs were evaluated by two examiners and scored for image quality: 1, very poor; 2, poor; 3, fair; 4, good; and 5, excellent. The evaluations were repeated at 30 days. Results: Intraobserver reproducibility was substantial (kappa 5 0.798 and 0.667). Also, the two examiners showed substantial agreement (kappa 5 0.726). There was a significant difference (a 5 1%) between the scores for the films under study. At a 30 cm distance, Espeed films had mean scores of 4 and 5 at 0.8 s and 1 s exposure times, and D-speed films, at 1.5 s, 2 s and 2.5 s exposure times. At a 60 cm distance, the best results were found for Espeed films at 2.0 s and 2.5 s exposure times. Conclusion: The films under study did not show any significant difference in the quality of rat mandible images as long as exposure times were adequate to their sensitivity and focal distance. |
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