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      Comparative analysis of human and bovine teeth: radiographic density

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          Abstract

          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.

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          Bovine teeth as possible substitutes in the adhesion test.

          In order to find a substitute for human teeth in the adhesion test, the adhesive strength to bovine teeth was compared with that to human teeth using five dental cements and two composite resins. The adhesion to enamel and the superficial layer of dentin showed no statistically significant difference between human and bovine teeth, although the mean values were always slightly lower with bovine teeth. Adhesion to bovine dentin decreased considerably with the depth of dentin.
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            Comparison of the number and diameter of dentinal tubules in human and bovine dentine by scanning electron microscopic investigation.

            Detailed information on dentine structure is essential for interpreting data from investigations on dentine-adhesive materials. The purpose here was to compare the number and diameter of dentinal tubules at similarly prepared surfaces of bovine permanent central incisors and human deciduous and third molars. In bovine teeth, crowns and roots were used; in human samples only the crowns were investigated. Tubule density in the middle layer was higher in bovine root (BR) dentine (number of tubules per mm(2)+/-SD: 23, 760+/-2453) than in human deciduous (HD) (18,243+/-3845), human permanent (HP) (18,781+/-5855), and bovine coronal (BC) (17, 310+/-2140) dentine. The corresponding values for the deep layer were 23,738+/-4457 (BR), 24,162+/-5338 (HD), 21,343+/-7290 (HP), and 20,980+/-4198 (BC). No significant differences were found for the number of dentinal tubules in bovine coronal dentine compared to the dentine of human deciduous and permanent molars. The mean diameter of bovine dentinal tubules was slightly, but not significantly, higher than in human dentine (middle layer/deep layer+/-SD): BC, 2. 85 microm+/-0.18/3.50 microm+/-0.33; BR, 3.10 microm+/-0.33/3.23 microm+/-0.30; HD, 2.55 microm+/-0.16/2.82 microm+/-0.28; HP, 2.65 microm+/-0.19/2.90 microm+/-0.22. These findings demonstrate that corresponding coronal dentine layers of human deciduous and permanent molars, and of bovine central incisors, are not significantly different in their number of tubules per mm(2) and their tubule diameter, whereas tubule density in bovine root dentine is significantly higher. These results suggest that provided standardized preparations are used, bovine incisor crown dentine is a suitable substitute for human molar dentine in adhesion studies.
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              A comparison of laterally condensed gutta-percha, thermoplasticized gutta-percha, and mineral trioxide aggregate as root canal filling materials.

              The purpose of this study was to evaluate the potential of using mineral trioxide aggregate as a root canal filling material by comparing its apical sealing ability with that of laterally condensed gutta-percha with sealer and high-temperature thermoplasticized gutta-percha with sealer in extracted bovine teeth. Sixty bovine incisors with single canals were prepared in a standard manner using LightSpeed instruments, randomly divided into three groups of 20 teeth, and obturated. The sealing ability of each technique was assessed by immersion in 1% methylene blue dye for 3 days. The teeth were cleared, and the linear extent of dye penetration was measured with a stereomicroscope. Data were analyzed by the Kruskal-Wallis one-way ANOVA followed by Dunn's test. Canals filled with laterally condensed gutta-percha or thermoplasticized gutta-percha showed significantly less apical dye penetration than canals obturated with mineral trioxide aggregate (p < 0.001). There was no significant difference in leakage between the laterally condensed group and the thermoplasticized group. The results suggest that gutta-percha obturation may provide an apical seal that is superior to MTA.
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                Author and article information

                Journal
                bor
                Brazilian Oral Research
                Braz. oral res.
                Sociedade Brasileira de Pesquisa Odontológica - SBPqO (São Paulo, SP, Brazil )
                1806-8324
                1807-3107
                December 2008
                : 22
                : 4
                : 346-351
                Affiliations
                [01] São José dos Campos SP orgnameSão Paulo State University (UNESP) orgdiv1School of Dentistry of São José dos Campos Brazil
                [02] São José dos Campos SP orgnameSão Paulo State University (UNESP) orgdiv1School of Dentistry of São José dos Campos orgdiv2Department of Social Dentistry and Children's Clinic Brazil
                [04] São José dos Campos SP orgnameSão Paulo State University (UNESP) orgdiv1School of Dentistry of São José dos Campos orgdiv2Department of Diagnosis and Oral Surgery Brazil
                [03] São José dos Campos SP orgnameSão Paulo State University (UNESP) orgdiv1School of Dentistry of São José dos Campos orgdiv2Department of Biosciences and Oral Diagnosis Brazil
                Article
                S1806-83242008000400011 S1806-8324(08)02200411
                10.1590/S1806-83242008000400011
                19148391
                95ef6b5c-ed4d-4aa0-a5ec-5104c5289e8a

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 11 December 2006
                : 05 September 2007
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 18, Pages: 6
                Product

                SciELO Brazil

                Categories
                Radiology

                X-Rays,Tooth,Cattle,Humans,Radiography, dental
                X-Rays, Tooth, Cattle, Humans, Radiography, dental

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