Access cavity

Which of the following statements is incorrect

• the pulp chamber occupies a central position in the crown of the tooth

• in the mesiodistal direction

  root canal entrances are always located at the junction of the walls and bottom of the pulp chamber

• the entrances to the root canals are always equidistant from the line drawn through the center of the bottom of the pulp chamber

• the pulp chamber is at the level of the enamel-cement joint equidistant from the outer contours of the teeth

Properly made access cavity allows us to

• find all root canals

   

• clean and shape root canals

• irrigate root canal

• everything is correct

Preoperative radiograph for endodontic procedures is most often

• orthopantomograph

• retroalveolar radiograph

• segmental cone-beam CT

• bite-wing radiograph

The roof of the pulp chamber of most molars is located

• 2 mm from the tip of the cusp

• 2 mm coronary from the enamel-cement junction of the tooth

• at the level of the enamel-cement junction

• 1 mm below the enamel-cement junction

The three-dimensional position of the tooth in the jaw is determined by

• studying radiograms

• palpation of the alveolar ridge

• knowing the usual inclinations of the teeth

• all of the above is correct

Before you start access cavity preparation, you always need to

• anesthetize the patient

• remove caries

• remove all fillings

• all of the above is correct

When making access cavity, we know that we are in the pulp chamber by

• bleeding

• feeling of “falling through” with the bur

• by visualizing the bottom of the pulp chamber which is darker in color

• all of the above is correct

Access cavity of the upper incisors

• is triangular

• is oval

• is rectangular

• none of the above is true

Access cavity of the second upper molar

• is triangular

• is oval

• is rectangular

• all of the above is true

When preparing the access cavity of the first upper molar

• part of the dentin at the base of the pulp chamber should be removed to reveal the secondary mesiobuccal canal

• the mesial marginal ridge should be removed

• the access cavity should be wider distally

• the transverse ridge should be removed