18. Which one of the following is true about benefits of using a combination of instruments for endodontic therapy. I. Instruments can be used in a manner that promotes their individual strenghts and avoids their weaknesses. II. Hand instruments secure a patent glide path Tapered rotary instruments efficiently enlarge coronal canal areas IV. Less tapered instruments allow additional apical enlargement. a. Only I b. Only II c. I and IV d. I,II and IV e. I,II,III and IV

Question

18. Which one of the following is true about benefits of using a combination of instruments for endodontic therapy. I. Instruments can be used in a manner that promotes their individual strenghts and avoids their weaknesses. II. Hand instruments secure a patent glide path Tapered rotary instruments efficiently enlarge coronal canal areas IV. Less tapered instruments allow additional apical enlargement. a. Only I b. Only II c. I and IV d. I,II and IV e. I,II,III and IV

Answer 1

The correct answer is:d. I, II, and IVExplanation:I. Instruments can be used in a manner that promotes their individual strengths and avoids their weaknesses.This statement is true. Using a combination of instruments allows for the strengths of each instrument to be utilized while minimizing their weaknesses. For example, hand instruments are often used for initial shaping and cleaning, while rotary instruments are used for more precise and efficient enlargement of the canal.II instruments secure a patent glide path.This statement is true. Hand instruments are often used to establish a glide path, which is a pathway that allows for smooth and efficient navigation through the root canal system. This helps to ensure that the canal is properly cleaned and shaped.IV. Less tapered instruments allow additional apical enlargement.This statement is true. Less tapered instruments are designed to allow for more apical enlargement, which is important for accessing and cleaning the apical portion of the root canal. This can be particularly useful in cases where there is a need for additional apical preparation.Statement III, "Tapered rotary instruments efficiently enlarge coronal canal areas," is not necessarily true. Tapered rotary instruments are typically used for coronal enlargement, but they are not specifically designed to enlarge coronal canal areas. Therefore, statement III is not included in the correct answer.

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