Moreira Patrícia Lima, Messora Michel Reis, Pereira Stela Márcia, Almeida Solange Maria de, Cruz Adriana Dibo da
Dental School, University Center of Lavras, MG, Brazil.
Braz Dent J. 2011;22(2):129-33. doi: 10.1590/s0103-64402011000200007.
The aim of this study was to evaluate the accuracy on the diagnosis of secondary caries-like lesions simulated on esthetic restorations of different materials, changing the incidence vertical angle (IVA) of the x-ray beam. Twenty human teeth received MOD inlay preparations. In the experimental group (n=10), a round cavity was made in the floor of the proximal box to simulate the caries-like lesion. All teeth were restored with 3 composite resins (Charisma, Filtek-Z250 and TPH-Spectrum) at 3 moments. Two radiographic images were acquired with 0º and 10º IVA. Ten observers evaluated the images using a 5-point confidence scale. Intra- and interobserver reliability was analyzed with the Interclass Correlation Coefficient and the diagnostic accuracy was evaluated using the area under the ROC curve (A(z)), Friedman test and Wilcoxon test (α=0.05). Higher accuracy values were obtained with 10º IVA (A(z)=0.66, Filtek-Z250>A(z)=0.56, TPH-Spectrum) compared to 0º (A(z)=0.55, Charisma>A(z)=0.37, TPH-Spectrum), though without statistically significant difference (p>0.05). The detection of secondary caries-like lesions simulated on esthetic restorations of different materials suffered no negative influence by changing the IVA of the x-ray beam.
本研究的目的是评估在改变X射线束的入射垂直角度（IVA）时，不同材料的美学修复体上模拟的继发龋样病变的诊断准确性。20颗人牙进行了MOD嵌体预备。在实验组（n = 10）中，在邻面盒底部制作一个圆形洞以模拟龋样病变。所有牙齿在三个时间点用三种复合树脂（卡瑞斯玛、Filtek-Z250和TPH-Spectrum）进行修复。用0°和10°的IVA采集两张X线图像。10名观察者使用5分置信量表对图像进行评估。采用组内相关系数分析观察者内和观察者间的可靠性，并使用ROC曲线下面积（A(z)）、Friedman检验和Wilcoxon检验（α = 0.05）评估诊断准确性。与0°（A(z) = 0.55，卡瑞斯玛>A(z) = 0.37，TPH-Spectrum）相比，10°的IVA获得了更高的准确性值（A(z) = 0.66，Filtek-Z250>A(z) = 0.56，TPH-Spectrum），尽管无统计学显著差异（p>0.05）。改变X射线束的IVA对不同材料美学修复体上模拟的继发龋样病变的检测没有负面影响。
