Introduction:

the Klammt open elastic activator is a functional device that allows the correction of mandibular position anomalies by taking advantage of the force generated by the musculature.

Objective:

the objective of the investigation was to evaluate the results of treatment of class II division 1 with the elastic open activator of Klammt.

Method:

we performed a quasi-experimental modality before and after without a control group in 15 patients who were admitted to the orthodontic clinic of the University Clinic of Stomatological Specialties "Manuel Cedeño", and attended in the period from February 2016 to February 2018.

Results:

the study population was represented by 73.33% of the ages between seven to nine years and the female sex was the most representative with 60.00%. Class II division 1 was corrected in 80.00% of patients as well as the molar ratio, and aesthetics improved after treatment in 73.33% of patients.

Conclusions:

with the use of Klammt elastic open activator favorable results are achieved in the treatment of class II division 1 which favors a functional and aesthetic balance of the stomatognathic system.

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