Comparative analysis of human and bovine teeth: radiographic density.
Since bovine teeth have been used as substitutes for human teeth in in vitro dental studies, the aim of this study was to compare the radiographic density of bovine teeth with that of human teeth to evaluate their usability for radiographic studies. Thirty bovine and twenty human teeth were cut transversally in 1 millimeter-thick slices. The slices were X-rayed using a digital radiographic system and an intraoral X-ray machine at 65 kVp and 7 mA. The exposure time (0.08 s) and the target-sensor distance (40 cm) were standardized for all the radiographs. The radiographic densities of the enamel, coronal dentin and radicular dentin of each slice were obtained separately using the 'histogram' tool of Adobe Photoshop 7.0 software. The mean radiographic densities of the enamel, coronal dentin and radicular dentin were calculated by the arithmetic mean of the slices of each tooth. One-way ANOVA demonstrated statistically significant differences for the densities of bovine and human enamel (p < 0.05) and for bovine and human coronal dentin (p < 0.05). No statistically significant differences were found for the bovine and human radicular dentin (p > 0.05). Based on the results, the authors concluded that: a) the radiographic density of bovine enamel is significantly higher than that of human enamel; b) the radiodensity of bovine coronal dentin is statistically lower than the radiodensity of human coronal dentin; bovine radicular dentin is also less radiodense than human radicular dentin, although this difference was not statistically significant; c) bovine teeth should be used with care in radiographic in vitro studies.
Tanaka
Jefferson Luis Oshiro
JL
School of Dentistry of São José dos Campos, São Paulo State University, Brazil. jefftanaka@uol.com.br
Medici Filho
Edmundo
E
Salgado
José Antônio Pereira
JA
Salgado
Miguel Angel Castillo
MA
Moraes
Luiz Cesar de
LC
Moraes
Mari Eli Leonelli de
ME
Castilho
Julio Cezar de Melo
JC
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003743:Dental Enamel / Q000000981:diagnostic imaging* / Q000502:physiology; D003804:Dentin / Q000000981:diagnostic imaging*; D006801:Humans; D023421:Models, Animal; D019252:Radiography, Dental, Digital; D014070:Tooth / Q000000981:diagnostic imaging*; D014965:X-Rays