Cephalometric changes in patients with mandibular retrognathism treated with the modified Quirós-Crespo active mandibular positioner

Authors

Keywords:

Orthodontics; mandibular retrognathism; prognathism; activator appliances; orthodontic appliances; malocclusion; cephalometry; cephalometric changes; functional jaw orthopedics.

Abstract

Background: Functional appliances consist of devices that guide the mandible into a more anterior position.

Objective: To evaluate the cephalometric changes in patients with mandibular retrognathism treated with the modified Quirós-Crespo active mandibular positioner.

Methodology: An open experimental design with historical control was used in the Sancti Spíritus Provincial Stomatological Clinic Orthodontics service, between September 2018 and April 2021. Twenty patients with mandibular retrognathism who fulfilled the inclusion criteria were included in the study group (treatment with the Quirós-Crespo active mandibular positioner) and twenty patients in the historical control group (previous treatment with the Neville Bass). Empirical and statistical methods were used.

Results: At the beginning of the study, the patients had a mean age of 9 years, 52.5% were male, and there were no statistically significant differences between the two groups, as well as two of the cephalometric variables. After one year of treatment, 90% of the patients experienced favorable changes in the cephalometric variables with significant differences between both groups in mandibular length, in favor of the control group.

Conclusions: The skeletal cephalometric variables show favorable modifications in patients with mandibular retrognathism treated with the modified Quirós-Crespo active mandibular positioner.

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References

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Published

2026-02-28

How to Cite

1.
Verano Luis L, de la Rosa Cabrera Y, Pérez García LM,  Benitez Guzmán IM,  Jiménez Marín O. Cephalometric changes in patients with mandibular retrognathism treated with the modified Quirós-Crespo active mandibular positioner. Gac méd espirit [Internet]. 2026 Feb. 28 [cited 2026 Mar. 11];28. Available from: https://revgmespirituana.sld.cu/index.php/gme/article/view/2551

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Section

RESEARCH ARTICLES (Original)