Skeletal Class II correction and neuromuscular adaptation with twin-block: A cephalometric and electromyography study in adults

Abstract

Introduction: It is believed that significant changes in electromyography (EMG) activity are observed at the end of the treatment, which are concomitant with a clinical improvement seen in sagittal jaw relationship during skeletal Class II correction by functional appliances. It is thought that similar interaction occurs between bone shape and muscle activity in the maxillofacial complex this study aims at evaluating the effects of twin-block on correction of skeletal Class II by lateral cephalogram and neuromuscular adaptation by EMG in adult patients. Materials and Methodology: The lateral cephalogram were taken with teeth in occlusion, and neuromuscular adaptation was observed on the basis of EMG recording of the anterior fiber of temporalis and masseter muscles using bipolar electrodes in rest and maximum clenching. All records were collected at pretreatment and after completion of 9 months of the active phase. Results: The amount of skeletal changes contributing to overjet reduction was 33.7%, and dental changes contributing to overjet reduction was 66.3%. Conclusion: The correction of Class II malocclusion for skeletal changes contributing to overjet reduction was 33.7%, and dental changes contributing to overjet reduction was 66.3%.