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Abstracts presented at the Joint Meeting of the British Association of Clinical Anatomists, the 12 th Congress of the European Association of Clinical Anatomy and the Portuguese Anatomical Society, 26 th – 29 th June 2013 at the Faculty of Medicine, University of Lisbon, Portugal
Author(s) -
Alzira CAVACAS MARIA,
Tavares Vitor,
Oliveira MARIA JOAO,
Brito JOSE,
Sezinando Ana,
Gobbi Pietro,
Breschi Lorenzo,
AGUAS Artur,
Perdigao Jorge,
Santos JOSE MARTINS DOS
Publication year - 2014
Publication title -
clinical anatomy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 71
eISSN - 1098-2353
pISSN - 0897-3806
DOI - 10.1002/ca.22406
Subject(s) - medicine , portuguese , citation , association (psychology) , library science , classics , history , psychology , computer science , philosophy , linguistics , psychotherapist
Continuous exposure to industrial noise, rich in low-frequency noise\ud(LFN) components, can cause the abnormal proliferation of extracellular\udmatrices. Studies have shown alterations in oral tissues. Noise\udis a powerful stressor. Parafunctional habits are a self-destructive\udprocess caused by stress that induces hyperactivity of masticatory\udmuscles, teeth grinding, leading to progressive dental wear. Teeth\udusually respond to injuries by forming tertiary dentine. The aim of\udthis study was to ascertain the effects of industrial noise on teeth,\udnamely tooth wear and tertiary dentine formation. Thirty adult Wistar\udrats were divided into 3 experimental groups of 10 animals, and\udexposed to industrial noise for 1, 3 and 7 months, with a weekly\udaverage of 40 h of exposure. A further 10 animals served as controls.\udWe extracted the molars and 126 teeth were processed for\udlight microscopy. The area of the cusps was measured. A further 44\udteeth were processed for electron microscopy, analyzed using fieldemission\udscanning electron microscopy (FESEM) and energy dispersive\udspectroscopy (EDS). Eight teeth were prepared for immunogold\udand field-emission in-lens scanning electron microscopy (FEI-SEM)\udand observed for collagen I. The average area of the molar cusps\uddiffered significantly between exposed and controls animals. The\udmost striking differences occurred between month 1 and 3. FESEM\udresults showed a 2.0 to 6.0 mm-wide mineral band in the roof of\udthe pulp chamber of the animals exposed. EDS showed that the\udband is hydroxyapatite, tertiary dentine. Study of collagen fibers\udshowed proliferation and disorganization on the exposed animals’\udcircumpulpar dentine. Significant tooth wear correlated with exposure\udtime and was significantly higher in the first 3 months. With\udLFN exposure there is formation of tertiary dentine and our results\udstrongly suggest that this stimulus is important in the pathogenesis\udof tooth wear