4 research outputs found
The effect of industrial noise on teeth.
Continuous exposure to industrial noise, rich in low-frequency noise
(LFN) components, can cause the abnormal proliferation of extracellular
matrices. Studies have shown alterations in oral tissues. Noise
is a powerful stressor. Parafunctional habits are a self-destructive
process caused by stress that induces hyperactivity of masticatory
muscles, teeth grinding, leading to progressive dental wear. Teeth
usually respond to injuries by forming tertiary dentine. The aim of
this study was to ascertain the effects of industrial noise on teeth,
namely tooth wear and tertiary dentine formation. Thirty adult Wistar
rats were divided into 3 experimental groups of 10 animals, and
exposed to industrial noise for 1, 3 and 7 months, with a weekly
average of 40 h of exposure. A further 10 animals served as controls.
We extracted the molars and 126 teeth were processed for
light microscopy. The area of the cusps was measured. A further 44
teeth were processed for electron microscopy, analyzed using fieldemission
scanning electron microscopy (FESEM) and energy dispersive
spectroscopy (EDS). Eight teeth were prepared for immunogold
and field-emission in-lens scanning electron microscopy (FEI-SEM)
and observed for collagen I. The average area of the molar cusps
differed significantly between exposed and controls animals. The
most striking differences occurred between month 1 and 3. FESEM
results showed a 2.0 to 6.0 mm-wide mineral band in the roof of
the pulp chamber of the animals exposed. EDS showed that the
band is hydroxyapatite, tertiary dentine. Study of collagen fibers
showed proliferation and disorganization on the exposed animals’
circumpulpar dentine. Significant tooth wear correlated with exposure
time and was significantly higher in the first 3 months. With
LFN exposure there is formation of tertiary dentine and our results
strongly suggest that this stimulus is important in the pathogenesis
of tooth wear