Physical and Chemical Injuries to teeth
[Shafer 7th ed 573-74/ 6th ed 571]
Loss of both enamel and dentin at the cervical area of teeth caused by mechanical loading forces such as swallowing and chewing, etc. The abfractive lesions were caused by flexure and ultimate fatigue of susceptible teeth at locations away from point of loading.
It is the physiologic wearing away of a tooth as a result of tooth-to-tooth contact as in mastication. This phenomenon is physiologic rather that pathologic .
It is the pathologic wearing away of tooth substance through some abnormal mechanical process. The most common cause of abrasion of root surfaces is the use of an abrasive dentrifice. It is usually manifested as V-shaped or wedge shaped ditch on the root side of the CEJ in teeth with gingival recession .
It is irreversible loss of dental hard tissue by a chemical process that does not involve bacteria. It is dissolution of mineralized tooth surface by acids that are introduced into oral cavity through vomiting, acidic beverages and citrus fruits, etc.