KHẢO SÁT THÔNG SỐ TỐI ƯU TRÊN MÁY CHỤP PHIM X-QUANG TRONG MIỆNG TRONG ĐÁNH GIÁ SỰ HIỆN DIỆN CỦA XOANG SÂU MÔ PHỎNG: NGHIÊN CỨU IN VITRO

Abstract

Objectives: The ultimate aim was to propose the optimal exposure parameters for detecting simulated cavities of each size. Subjects and Methods: Six standardized maxillary premolars were selected. Two radiographic assessment rounds were performed using three exposure modes of the RXDC intraoral X-ray device: En60 (60 kVp, 8 mA), En63 (63 kVp, 4 mA), and En65 (65 kVp, 4 mA). In the first round, intact teeth were radiographed. In the second round, simulated cavities with diameters of 1.0 mm and 0.5 mm were created using a veneer-marking bur. A total of 36 radiographs were obtained. Two clinicians with more than 10 years of experience evaluated the images four times. Their assessments were compared with the actual presence of cavities to determine the level of agreement using Cohen’s kappa statistic. Results: For cavities with a diameter of 1.0 mm, kappa values ranged from 0.833 to 1.000, indicating strong to almost perfect agreement. For cavities with a diameter of 0.5 mm, kappa values ranged from 0.333 to 1.000, with considerable variability between assessment rounds and between the two clinicians. Conclusion: For larger cavities (1.0 mm diameter), the En60 mode (60 kVp, 8 mA) provided high diagnostic accuracy while minimizing radiation exposure to the patient. For smaller cavities (0.5 mm diameter), no optimal exposure parameter could be determined using the periapical X-ray machine.