Cephalometric modifications in patients with mandibular retrognathism treated with the modified Nance Button
Keywords:
Mandibular retrognathism/therapy; functional appliances; class II syndrome; Nance button; cephalometry; malocclusion angle class II/therapy; orthodontic appliances functionalAbstract
Background: Functional appliances can modify the dental, skeletal and soft tissue relationships of persons.
Objective: To describe the cephalometric changes in patients with mandibular retrognathism treated with the modified Nance button appliance.
Methodology: An experimental, open, study with historical control was conducted at the Orthodontics service of the Provincial Teaching Stomatology Clinic Dr. Justo Ortelio Pestana Lorenzo of Sancti Spíritus, between January 2022 and March 2024. Twenty patients who met the selection criteria were included, by intentional assignment, which formed the study group. Methods from the theoretical, empirical and statistical levels were used. Cephalometric variables, age and sex were measured.
Results: At one year of treatment, in the study group the maxillomandibular relationship decreased by 2.4°, the mandibular position increased to 78.3 mm, the facial depth to 83.6 mm, the mandibular length experienced a mean growth of 4.1 mm, the soft facial angle a variation of 5.5° and the Ricketts area of 3.1°; discrete changes were verified, with 0.5° of variation in the mandibular incisor angle. Similar changes occurred in the control group, but more marked with statistically significant differences in the maxillomandibular relationship, with a decrease of 3.4 mm and the facial depth, with an increase of 4.6 mm.
Conclusions: The demographic and cephalometric variables were similar in both groups; after one year of treatment, cephalometric variables in these patients evolved toward normal values in a manner similar to the Neville Bass appliance, suggesting that this approach should be considered as an alternative for treating patients with mandibular retrognathism.
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Copyright (c) 2026 Loretta de los Milagros López Hernández, Lizandro Michel Pérez García, Yenelis de la Rosa Cabrera, Iralys María Benítez Guzmán, Dayanis Marín Herrera, Eduardo José Reytor Saavedra
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