Convenient model of hard tissue simulation for dental radiographic research and instruction

E. A. Munhoz, Claudio Roberto Gaiao Xavier, Roberto Ponce Salles, A. Capelozza, A. Bodanezi
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Abstract

BACKGROUND The authors describe a technique for building an alternative jawbone phantom using dental gypsum and rice for research and dental radiology instruction. AIM To investigate the potential of an alternative phantom to simulate the trabecular bone aspect of the human maxilla in periapical radiographs. METHODS Half-maxillary phantoms built from gypsum-ground rice were exposed to X-rays, and the resulting images (experimental group) were compared to standardized radiographic images produced from dry human maxillary bone (control group) (n = 7). The images were blindly assessed according to strict criteria by three examiners for the usual trabecular aspects of the surrounding bone, and significant differences between groups and in assessment reliability were compared using Fisher’s exact and kappa tests (α = 0.05). RESULTS The differences in the trabecular aspects between groups were not statistically significant. In addition, interobserver agreement among observers was 0.43 and 0.51 for the control and experimental groups, respectively, whereas intraobserver agreement was 0.71 and 0.73, respectively. CONCLUSION The tested phantom seemed to demonstrate potential for trabecular bone image simulation on maxillary periapical radiographs.
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用于牙科放射学研究和教学的方便的硬组织模拟模型
背景 作者描述了一种使用牙科石膏和大米制作替代颌骨模型的技术,用于研究和牙科放射学教学。目的 研究一种替代模型在根尖周X光片中模拟人类上颌骨骨小梁方面的潜力。方法 用石膏磨成的大米制成半颌骨模型,将其暴露在 X 射线下,并将得到的图像(实验组)与用干燥的人类上颌骨(对照组)(n = 7)制作的标准化放射图像进行比较。图像由三名检查人员根据严格的标准对周围骨小梁的通常情况进行盲评,并使用费雪精确检验和卡帕检验(α = 0.05)比较组间差异和评估可靠性的显著差异。结果 组间骨小梁方面的差异无统计学意义。此外,对照组和实验组观察者之间的一致性分别为 0.43 和 0.51,而观察者内部的一致性分别为 0.71 和 0.73。结论 测试的模型似乎证明了在上颌骨根尖周X光片上模拟骨小梁图像的潜力。
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