Macarena Rodríguez-Luengo; Francisca Alvarado-Bustamante; Paula Morales-Guzmán; María Fernanda Villalobos- Dellafiori; Sven Niklander-Ebensperger; Juan José Valenzuela-Fuenzalida & Patricio Meléndez-Rojas

A bony tissue variation called Ponticulus posticus (PP) is described in the posterior arch of the atlas, which has been associated with the development of cervical pain. The aim of this study was to determine the frequency of PP in digital lateral cephalograms. This study was an observational descriptive study, in which 450 digital lateral cephalograms obtained from the database of the Oral and Maxillofacial Imaging Service of the Faculty of Dentistry of the Andrés Bello University, Viña del Mar, Chile, were analyzed. The presence of PP was analyzed in each cephalogram, and the Cederberg and Stubbs classification was used to determine the degrees of ossification. The Chi-square test was applied to establish an association between the presence of PP with gender and age. Of the 450 lateral cephalograms, 42.4 % presented PP, with a higher prevalence in the 21-40 year range. In terms of the degree of ossification, grade 2 was the most prevalent type (25 %), followed by grade 4 (9.5 %), and grade 3 (8 %). No association was found between the presence of PP with age and gender (P > 0.05). PP is common in the population and is observed at different ages without a sex preference.

KEY WORDS: Ponticulus posticus; Cervical atlas; Lateral skull cephalogram; Anatomy.

RODRÍGUEZ-LUENGO, M.; ALVARADO-BUSTAMANTE, F.; MORALES-GUZMÁN, P.; VILLALOBOS-DELLAFIORI, M. F.; NIKLANDER-EBENSPERGER, S.; VALENZUELA- FUENZALIDA, J. J. & MELÉNDEZ-ROJAS, P. Frequency of Ponticulus posticus in digital lateral cephalograms. Int. J. Morphol., 42(1):65-70, 2024.