Longitudinal evaluation of jaw muscle activity and mandibular kinematics in young patients with Class II malocclusion treated with the Teuscher activator

  1. Maria José Cuevas
  2. Alberto Cacho Casado
  3. Jose Antonio Alarcón
  4. Conchita Martín
Revista:
Medicina oral, patología oral y cirugía bucal. Ed. inglesa

ISSN: 1698-6946

Año de publicación: 2013

Volumen: 18

Número: 3

Páginas: 497-504

Tipo: Artículo

DOI: 10.4317/MEDORAL.18610 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Medicina oral, patología oral y cirugía bucal. Ed. inglesa

Objetivos de desarrollo sostenible

Resumen

Objectives: A longitudinal study was performed to evaluate the jaw muscle activity and mandibular kinematics after Teuscher activator treatment and at 2 years after orthodontic treatment completion. Material and Methods: Twenty-seven children with Class II division 1 malocclusion were evaluated before treatment (T0; mean: 11.6 years), after functional treatment (T1; mean: 12.8 years), and 2 years after orthodontic treatment (T2; mean: 18 years). Bilateral surface electromyographic activities of the anterior temporalis, posterior temporalis, masseter, and suprahyoid muscle areas were analyzed at rest and during clenching, swallowing, and mastication. Kinematic recordings of the mandibular maximum opening, lateral shift, right and left lateral excursions, and protrusion were evaluated. Results: Compared to T0, the left masseter activity during clenching was decreased at T1 but increased at T2, similar to the other evaluated muscles. The suprahyoid activity during swallowing was increased at T1 but decreased at T2. The masseter activity during mastication was increased at T1 and further increased at T2. The left and right lateral excursions and protrusion did not show significant changes throughout the experiment. Conclusions: Teuscher activator and subsequent fixed orthodontic treatment improved jaw muscle function; however, a long period was needed to attain complete neuromuscular adaptation.