Svenson B, Lindvall A M, Gröndahl H G
Department of Oral Radiology, Postgraduate Dental Education Center, Orebro, Sweden.
Dentomaxillofac Radiol. 1993 Feb;22(1):7-12. doi: 10.1259/dmfr.22.1.8508944.
A new dental X-ray film, Agfa Gevaert Dentus M4, has recently been introduced. Its diagnostic ability for approximal caries and its sensitometric properties were compared with those of Kodak Ultraspeed and Ektaspeed dental X-ray films. Seven general practitioners and six consultants in oral radiology recorded both incipient and manifest approximal caries on radiographs of 100 extracted premolars. ROC-curve technique was used to analyse the results. A significant difference in diagnostic accuracy for both incipient and manifest caries was found between Ektaspeed and Dentus M4, but not between Ektaspeed and Ultraspeed or between Ultraspeed and Dentus M4. Ektaspeed had the highest diagnostic accuracy, 0.79, while Dentus M4 had the lowest, 0.72. No significant differences were found between the different films in their ability to separate sound from cavitated surfaces. The speed and contrast of the three dental X-ray films were measured according to ISO 3665. Dentus M4 film was found to be 1.8 times faster than Ektaspeed and 2.8 times faster than Ultraspeed. Dentus M4 had a lower film contrast than both Ultraspeed and Ektaspeed. Films of the three different types and with about the same expiry date were stored in seven different clinics. One film of each type was developed each month over a 16-month period under standardized conditions. Base plus fog density was measured. The Dentus M4 had a more rapid build up of fog compared to Ultraspeed and Ektaspeed films. We conclude that the new Dentus M4 film has a limited value in the diagnosis of incipient caries.
一种新型牙科X线胶片——爱克发·吉华 Dentus M4最近已面市。将其对邻面龋的诊断能力及其感光特性与柯达超高速和高感光度牙科X线胶片进行了比较。七名全科医生和六名口腔放射学顾问在100颗拔除前磨牙的X线片上记录了早期和明显的邻面龋。采用ROC曲线技术分析结果。发现高感光度胶片和Dentus M4胶片在早期龋和明显龋的诊断准确性上存在显著差异，但高感光度胶片和超高速胶片之间以及超高速胶片和Dentus M4胶片之间不存在显著差异。高感光度胶片的诊断准确性最高，为0.79，而Dentus M4胶片最低，为0.72。不同胶片在区分完好表面和龋洞表面的能力方面未发现显著差异。根据ISO 3665测量了三种牙科X线胶片的速度和对比度。发现Dentus M4胶片比高感光度胶片快1.8倍，比超高速胶片快2.8倍。Dentus M4胶片的对比度低于超高速胶片和高感光度胶片。三种不同类型且有效期大致相同的胶片存放在七个不同的诊所。在16个月的时间里，每月在标准化条件下冲洗每种类型的一张胶片。测量了片基加灰雾密度。与超高速胶片和高感光度胶片相比，Dentus M4胶片的灰雾积累更快。我们得出结论，新型Dentus M4胶片在早期龋诊断中的价值有限。
