(BQ) Part 2 book "Shafer's textbook of oral pathology" presentation of content: Physical and chemical injuries of the oral cavity, regressive alterations of the teeth, healing of oral wounds, oral aspects of metabolic diseases, allergic and immunologic diseases of the oral cavity, diseases of specific systems, forensic odontology,. and other contents. | Section III Injuries and Repair 2082 Chapter 12 Physical and Chemical Injuries of the Oral Cavity B. Sivapathasundharam Chapter Outline . Injuries of Teeth Associated with Tooth Preparation . Effect of Tooth Preparation . Reaction To Rotary Instrumentation . Effect of Heat . Effect of Restorative Materials . Physical Injuries of the Teeth . Physical Injuries of the Bone . Physical Injuries of Soft Tissues . Nonallergic Reactions to Drugs and Chemicals used Systemically . Occupational Injuries of the Oral Cavity . Occlusal Trauma 2083 Injuries of the oral cavity may be caused by physical or chemical causes. Physical injuries may be iatrogenic, self-inflicted, traumatic, or occupational. The most important iatrogenic cause is the repair of tooth affected by dental caries or other developmental defects and restoration of missing tooth. Iatrogenic cause also includes X radiation and laser radiation. Self-induced or factitious injuries are due to overzealous oral hygiene practices, caused by psychotic or neurotic condition, or habitual. Traumatic causes include a fall, fight, road traffic accidents, and sports injuries. Although chemical injuries are caused by environmental elements such as toxic levels of chemicals in the water, air, or consumables, the restorative and endodontic materials used in the routine dental practice play an important role. Injuries of Teeth Associated with Tooth Preparation The teeth, particularly the dentin and pulp, may be injured not only by dental caries, but also from those procedures necessary for the repair of lesions involving dental hard tissues. Preparation of the teeth for receiving the restorations include cutting, grinding, and etching with acids etc. These physical and chemical methods of tooth preparation as well as the various medicaments and filling materials which are inserted into the prepared tooth, have their own effects. Effect of Tooth Preparation 2084 The effect upon the dental pulp of restorative procedure
