What is the number of Gate Glidden drill used in mid canal region?

**Core Concept**
The Gate Glidden drill is a type of reamer used in endodontics for enlarging root canals. The correct size of the drill used in the mid-canal region is crucial for effective canal preparation and to prevent potential complications.

**Why the Correct Answer is Right**
The mid-canal region is typically the area between the coronal third and the apical third of the root canal. The correct size of the drill used in this region is determined by the specific Gate Glidden drill size chart. A #40 or #50 Gate Glidden drill is commonly used in the mid-canal region to further enlarge the canal and prepare it for obturation.

**Why Each Wrong Option is Incorrect**
**Option A:** #10 - This size is too small for the mid-canal region and may not effectively enlarge the canal.
**Option B:** #60 - This size is too large for the mid-canal region and may lead to over-preparation of the canal.
**Option C:** #30 - This size may be too small for effective canal preparation in the mid-canal region.

**Clinical Pearl / High-Yield Fact**
Remember that the correct size of the Gate Glidden drill used in the mid-canal region may vary depending on the specific root canal anatomy and the clinician's preference. It is essential to consult the Gate Glidden drill size chart and use the correct size to prevent potential complications.

**Correct Answer:** C. #30