Evaluation of condylar position and temporomandibular dysfunction in Class II patients treated with mandibular orthopedic advancement

Ana Cláudia de Castro Ferreira CONTI, Marcos Roberto de FREITAS, Paulo César Rodrigues CONTI

Objective: to evaluate the possible effects of orthopedic mandibular protrusion and condyle position in the prevalence and severity of Temporomandibular Disorders (TMD). Methodology: the sample was composed of 60 individuals with Angle Class II malocclusion divided into three groups depending upon the accomplishment of functional orthopedic treatment (prior, during and after therapy with the Bionator appliance). An anamnestic questionnaire, composed of questions regarding most frequent symptoms was used to classify the sample according to the TMD presence and severity. A clinical examination, including temporomandibular joint (TMJ) and muscle palpation, mandibular range of motion and joint noises analysis was also performed. Serial standard right and left TMJ transcranial images were taken with the teeth in intercuspal position, digitalized and condyle concentricity was determined. Results: one-way ANOVA, Kruskal-Wallis and Chi- square accounted for data analysis. Based on the anamnestic questionnaire, 30% was considered as having mild TMD, while 3.33% had moderate TMD, with no difference between groups (p > 0.05). Group II (during therapy) has shown significant anterior condyle positioning (p < 0.05) when compared to group I, although no association was found between this variable and TMD presence or severity (p > 0.05). Conclusion: mandibular orthopedic protrusion was not a risk factor for TMD in the sample studied.

Keywords: Orthopedics. Temporomandibular dysfunction. Condyle position.

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