Tveit A B, Espelid I, Erickson R L, Glasspoole E A
School of Dentistry, University of Bergen, Dept. of Cariology and Endodontics, Norway.
Community Dent Oral Epidemiol. 1991 Dec;19(6):333-5. doi: 10.1111/j.1600-0528.1991.tb00182.x.
The purpose of this study was to assess to what extent angulation of an X-ray beam could affect the quality of diagnoses of caries adjacent to restorations with different radiopacities. Amalgam and composite class II restorations with and without secondary caries were done in extracted teeth. The teeth were radiographed using four different vertical angulations -0, 5, 10, and 15 degrees. Eight dentists diagnosed caries lesions on these radiographs. The best diagnostic outcome was found for the composite restorations radiographed at 10 degrees vertical angulation. Diagnosis was generally better for lesions marginal to composites compared to amalgams. The quality of secondary caries diagnosis in connection with amalgam was not significantly affected by variations in vertical angulation from 0 up to 15 degrees.
本研究的目的是评估X射线束的角度在多大程度上会影响对不同不透射线性修复体邻近龋病的诊断质量。在拔除的牙齿上制作了有或无继发龋的银汞合金和复合树脂II类修复体。使用四种不同的垂直角度——0度、5度、10度和15度对牙齿进行X线摄影。八位牙医对这些X线片上的龋损进行诊断。结果发现，垂直角度为10度时拍摄的复合树脂修复体的诊断效果最佳。与银汞合金相比，复合树脂边缘病变的诊断通常更好。从0度到15度的垂直角度变化对与银汞合金相关的继发龋诊断质量没有显著影响。
