Twin blocks appliances treatment in patients with Moyers class III syndrome

Abstract

Introduction: Moyers class III syndrome is characterized by discrepancy in arch length, skeletal problems, muscle dysfunction, dental problems, and the patient's facial profile. In the national and international literature there is no evidence of the efficacy of treatment with twin blocks of Moyers class III syndrome.Objective: to evaluate treatment with twin blocks in patients with Moyers class III syndrome.Method: a quasi-experimental intervention study was carried out before and after without a control group, at the Manuel Cedeño University Clinic of Stomatological Specialties, in the period from January 2018 to March 2021. The sample was 93 patients. The variables studied were the occlusion relationship, the skull-mandibular skeletal relationship and the temporomandibular joint dysfunction. Class III twin blocks were placed in all patients.Results: with the use of twin blocks, significant changes were obtained in the molar ratio (-7,030 ± 0,7287 mm) and the overhang (2,213 ± 1,6074 mm); the skull-mandibular skeletal relationship was improved (2,659° ± 1,8696°); the function of the temporomandibular joint was found to be without symptoms and mild in 64,86 % and 57,14 % respectively, after treatment.Conclusions: with the use of twin blocks, the relationship between dental occlusion and cranio-mandibular skeletal class III is corrected, in addition to being an orthopedic-functional option that improves temporomandibular joint dysfunction in patients with Moyers class III syndrome.

Keywords

• bloques gemelos
• aparatos ortodóncicos funcionales
• prognatismo
• retrognatismo
• articulación temporomandibular
• oclusión dental.