Relationship between abnormal horizontal or vertical dental overlap and temporomandibular disorders / Relação de trespasse vertical e horizontal com desordens temporomandibulares

ABSTRACT

Purpose: This study investigated if abnormal vertical (overbite) and/or horizontal (overjet) dental overlap are more prevalent in adult subjects with clinical signs of temporomandibular disorders (TMD). Methods: Case-control design. The sample comprised 103 subjects, males and females from 19 to 54 year-old, which were divided into two groups: Group 1 (control) without TMD (n=52) and Group 2 (cases) with TMD (n=51). Inclusion criteria for Group 2 were based on axis I of the RDC/TMD protocol. Two calibrated examiners (Cohen kappa = 0.85) performed the clinical examination to collect data on occlusion and TMD. Data were analyzed by Chi-square tests. Results: Overbite mean values were 3.4 mm (control group) and 2.5 mm (cases group). Abnormal overbite was found in 26 subjects (50%) of the control group and 16 (31%) in the cases group (P=0.054). Overjet mean values were 2.4 mm and 2.0 mm for the control and cases groups, respectively. Abnormal overjet was found in 44 (85%) subjects of the control group and 44 (86%) of the cases group (P=0.811). No significant overall association was found between the tested occlusal variables and TMD (P=0.585). Conclusion: Overbite and overjet were not associated with TMD in this sample.

RESUMO

Objetivo: Este estudo investigou se anormalidades de trespasse vertical (overbite) e/ou horizontal (overjet) são mais prevalentes em sujeitos adultos com manifestações clínicas de desordens temporomandibulares (DTM). Metodologia: Desenho de caso-controle. A amostra consistiu de 103 sujeitos, com idades de 19 a 54 anos, que foram divididos em dois grupos: Grupo 1 (controle) sem DTM (n=52) e Grupo 2 (casos) com DTM (n=51). Os critérios de inclusão para o Grupo 2 basearam-se no eixo I do protocolo RDC/TMD. Dois examinadores calibrados (Cohen kappa = 0.85) realizaram o exame clínico para coleta dos dados de oclusão e de DTM. Data were analyzed by Chi-square tests.Resultados: Os valores médios de overbite foram 3,4 mm (controle) e 2,5 mm (casos). Overbite anormal foi mensurado em 26 sujeitos (50%) do grupo controle e 16 (31%) no grupo casos (P=0,054). Os valores médios de overjet foram de 2,4 mm e 2,0 mm para os grupos controle e casos, respectivamente. Observou-se overjet anormal em 44 (85%) sujeitos do grupo controle e 44 (86%) dos casos (P=0,811). Nenhuma associação significativa foi observada entre as variáveis oclusais testadas e DTM (P=0,585).Conclusão: Overbite e overjet não foram associadas a DTM nesta amostra.