Mixed-dentition analysis: Tomography versus radiographic prediction and measurement

Admin Dental Press

Edition V15N05 | Year 2010 | Editorial Article | Pages 159 to 165

Letícia Guilherme Felício , Antônio Carlos De Oliveira Ruellas , Ana Maria Bolognese , Eduardo Franzotti Sant’anna , Mônica Tirre De Souza Araújo

Objective: The aim of this study was to evaluate the method for mixed-dentition analysis using Cone-Beam Computed Tomography for assessing the diameter of intra-osseous teeth and compare the results with those obtained by Moyers, Tanaka-Johnston, and 45-degree oblique radiographs. Methods: Measurements of mesial-distal diameters of erupted lower permanent incisors were made on plaster cast models by using a digital calliper, whereas assessment of the size of non-erupted permanent pre-molars and canines was performed by using Moyer’s table and Tanaka-Johnston’s prediction formula. For 45-degree oblique radiographs, both canines and pre-molars were measured by using the same instrument. For tomographs, the same dental units were gauged by means of Dolphin software resources. Results: Statistic analysis revealed high agreement between tomographic and radiographic methods, and low agreement between tomographs and other methods being evaluated. Conclusion: Cone-Beam Computed Tomography was accurate for mixed-dentition analysis in addition to presenting some advantages over compared measurement methods: observation and measurement of intra-osseous teeth individually with the possibility, however, to view them from different prospects and without superimposition of anatomical structures.

Mixed dentition, Cone-Beam Computed Tomography, 45-degree oblique radiograph, Plaster cast,

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