ABSTRACT
The study was conducted to investigate the effect of low frequency noise on histomorphology of periodontal ligament of mouse. The study was randomized control trial of three month duration. Thirty adult BALB/c mice, half male and half female, were randomly divided into three groups. Control group A was kept in normal environment of animal house. Experimental group B was kept in silent condition while experimental group C was exposed to low frequency noise of 200 Hz continuously. At the end of three months, mice were euthanized, mandible removed and sections were taken for light microscopic study Overall there was significant difference when comparing groups A [normal environment], B [silent group], and C [low frequency noise exposed] regarding arrangement of Periodontal ligament fibers, thickness of the ligament, thickness of wall of blood vessels and destruction of alveolar bone. In most of the specimens, distortion of the normal periodontal fiber arrangement was encountered. It was concluded that exposure to low frequency noise significantly distorts the normal architecture of the periodontal ligament thus causing compromised function of the ligament