3. The preparation of an access cavity requires which of the following equipments? . Burs I. Magnification and illumination I. Endodontic explorers A. I and II B. Only I C. I and III D. All of the above

The correct answer is D. All of the above.<br /><br />The preparation of an access cavity, which is a crucial step in endodontic treatment, requires the use of several pieces of equipment:<br /><br />1. Burs: Burs are cutting instruments used to remove tooth structure and create the access opening. They come in various shapes and sizes to accommodate different aspects of the tooth structure.<br /><br />2. Magnification and illumination: Magnification and illumination are essential for precise and accurate access cavity preparation. They help the dentist visualize the tooth structure and identify any anatomical variations or obstructions.<br /><br />3. Endodontic explorers: Endodontic explorers are hand instruments used to explore the tooth structure and assess the condition of the pulp chamber and root canals. They are helpful in determining the extent of decay or infection and in locating the root canals during the access cavity preparation.<br /><br />Therefore, all of the mentioned equipment (burs, magnification and illumination, and endodontic explorers) are necessary for the preparation of an access cavity.