Concordance in the estimation of space requirements in orthodontics: Tanaka Index vs Cone Beam
DOI:
https://doi.org/10.59334/ROV.v1i44.676Keywords:
Analysis of Tanaka and Johnston, CBCT, mixed dentition, unerupted teeth, spaceAbstract
Introduction: in orthodontics, the initial diagnosis is essential for proper planning, with model analysis being one of the key components. Among the important measurements evaluated is the required space, defined as the area needed in the maxilla for the eruption of permanent teeth. Objective: This study aimed to determine the agreement between the Tanaka Índex and Cone Beam Computed Tomography (CBCT) in estimating the required space for the eruption of canines and premolars in the upper maxilla, in patients from the Orthodontics and Dentomaxillary Orthopedics postgraduate program at Universidad Andrés Bello. Methodology: a total of 22 patients treated between 2020 and 2024 were evaluated, revealing differences between the two methods. Results: The Tanaka Índex showed a tendency to overestimate the required space, providing more homogeneous results that were less tailored to the individual characteristics of each patient. In contrast, CBCT exhibited greater variability, suggesting it to be a more accurate and personalized method for orthodontic planning. The agreement between the methods was low, with values of 0.29 on the right side and 0.33 on the left side. Conclusion: the CBCT proved to be a more reliable tool in cases requiring greater precision to avoid unnecessary interventions. However, its higher cost and radiation exposure warrant careful consideration based on the specific needs of each patient.
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Copyright (c) 2026 Natasha Abdala, Alejandro Negrete, Julieta Correa, Francisca Rapu, Monserrat Navarro
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