Non-Carious Lesions Lecture Notes PDF

Non carious lesions Attrition: the wear of teeth at sites of direct contact between teeth in occlusal function and parafunctional activities Abrasion pathologic surface loss of teeth resulted from direct frictional forces between teeth and external objects Example: teeth brush abrasion, pipe smoking...

Non carious lesions Attrition: the wear of teeth at sites of direct contact between teeth in occlusal function and parafunctional activities Abrasion pathologic surface loss of teeth resulted from direct frictional forces between teeth and external objects Example: teeth brush abrasion, pipe smoking depression   Proximal abrasion resulted from excessive use of toothpicks The teeth brush abrasion is characterized by being?????  Iatrogenic abrasion: -Caused by faulty dental treatment. -Such as abrasion of opposing natural teeth with porcelain. -Recently, dental materials put into consideration simulation of natural tooth hardness to avoid excessive wear of opposing teeth. Erosion: The dissolution of teeth by acids which are NOT bacterial in origin    It is pathological loss of tooth structure resulting from chemico-mechanical actions, mainly due to acids, lesions are smooth, wide and shiny. Exogenous acids: ( lemon suction/excessive use of acidic drinks/acidic fumes/chlorinated pools) causes smooth lesions on labial surface of teeth. Endogenous acids:  generalized erosion of palatal and occlusal surface of upper teeth. Mandibular teeth are less affected as they are partially protected by the tongue    Cervical part of the tooth is subjected to compressive stresses at centric occlusion and tensile stresses at eccentric occlusion Faulty occlusion  excessive compressive and tensile forces micro-fractures at the thin enamel in cervical area The lesion has wedge shape Can involve one rotated or malaigned toot or multiple teeth with parafunctional occlusion.  Premolars are the most affected teeth   Natural defense mechanism including??? It is developmental defect in enamel due to improper enamel matrix formation As a result of injury of ameloblasts during enamel formation. Usually seen in anterior teeth and first molars In form of missing/ pitted/ grooved enamel or white and opaque areas It is developmental defect in enamel due to improper mineralization of enamel due to injury of ameloblasts. The affected area will not be defective, but chalky white/ opaque. Excessive fluoride exposure >10 ppm (when the child is born up to 6 yrs old) Leading to hypomineralization. Initially the lesion is white, but later becomes brownish causing mottled enamel. It may be very mild (