11. Which one of the following is not clinical objectives of root canal praparation? a. Removal of overlying dentine cause smooth internal walls provide straight line access to root canal. b. Instruments and irrigation must go deeper into the canal. c. After obturation there should be complete sealing of the pulp chamber and access cavity as a to prevent microleakage. d. All infected pulp tissue, bacteria and their by-products should be removed from the root canal. e. Tooth should be restored with permanent restoration to maintain it's form, functions and esthetics.

The correct answer is:<br /><br />c. After obturation there should be complete sealing of the pulp chamber and access cavity as a to prevent microleakage.<br /><br />Explanation:<br /><br />The clinical objectives of root canal preparation include:<br /><br />a. Removal of overlying dentine to cause smooth internal walls that provide straight-line access to the root canal.<br />b. Ensuring that instruments and irrigation go deeper into the canal to facilitate thorough cleaning and shaping.<br />d. Removing all infected pulp tissue, bacteria, and their by-products from the root canal to achieve asepsis.<br />e. Restoring the tooth with permanent restoration to maintain its form, functions, and esthetics.<br /><br />However, option c is not a clinical objective of root canal preparation. The sealing of the pulp chamber and access cavity after obturation is important, but it is not specifically an objective of the root canal preparation itself. Instead, it is more related to the final obturation and restoration phases of the root canal treatment.