Three-dimensional analysis of impacted maxillary third molars: A cone-beam computed tomographic study of the position and depth of impaction
de Andrade Priscila Ferreira, Silva Jesca Neftali Nogueira, Sotto-Maior Bruno Salles, Ribeiro Cleide Gisele, Devito Karina Lopes, Assis Neuza Maria Souza Picorelli,
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( de Andrade Priscila Ferreira ) - Federal University of Juiz de Fora Faculty of Dentistry Master′s Program in Dental Clinic
( Silva Jesca Neftali Nogueira ) - Federal University of Juiz de Fora Faculty of Dentistry Master′s Program in Dental Clinic
( Sotto-Maior Bruno Salles ) - Federal University of Juiz de Fora Faculty of Dentistry Department of Restorative Dentistry
( Ribeiro Cleide Gisele ) - Federal University of Juiz de Fora Faculty of Medical and Health Sciences - SUPREMA
( Devito Karina Lopes ) - Federal University of Juiz de Fora Faculty of Dentistry Department of Dental Clinic
( Assis Neuza Maria Souza Picorelli ) - Federal University of Juiz de Fora Faculty of Dentistry Department of Dental Clinic
Abstract
Purpose: The classification of impacted maxillary third molars (IMTMs) facilitates interdisciplinary communication and helps estimate the degree of surgical difficulty. Thus, this study aimed to develop a 3-dimensional classification of the position and depth of impaction of IMTMs and to estimate their prevalence with respect to gender and age.
Materials and Methods: This cross-sectional retrospective study analyzed images in sagittal and coronal cone-beam computed tomography (CBCT) sections of 300 maxillary third molars. The proposed classification was based on 3 criteria: buccolingual position (buccal, lingual, or central), mesial-distal position (mesioangular, vertical, or distoangular), and depth of impaction (low, medium, or high). CBCT images of IMTMs were classified, and the associations of the classifications with gender and age were examined using analysis of variance with the Scheffe post-hoc test. To determine the associations among the 3 classifications, the chi-square test was used (P<.05).
Results: No significant association of the classifications with gender was observed. Age showed a significant relationship with depth of impaction (P=.0001) and mesial-distal position (P=.005). The most common positions were buccal (n=222), vertical (n=184), and low (n=124). Significant associations among the 3 tested classifications were observed.
Conclusion: CBCT enabled the evaluation of IMTMs in a 3-dimensional format, and we developed a proposal for a new classification of the position and depth of impaction of IMTMs.
키워드
Molar; Third; Tooth; Impacted; Cone-Beam Computed Tomography
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