Cause that master G.P not reach working length although it is the same size of last file:
- a. Dentin debris.
- b. Ledge formation.
- c. A & b.
- d. None of the above.
The most likely reason why the master gutta-percha cone doesn't reach working length even though it has the same size as the last file is: (c. A & b) Dentin debris and ledge formation.
Here's why:
a. Dentin debris:
During canal preparation, microscopic dentin particles can accumulate at the apical portion of the canal. These debris might not be completely removed by irrigation and can act as a physical barrier, preventing the master cone from reaching its intended position.
b. Ledge formation:
During instrumentation, unintentional filing can create ledges or "steps" within the canal. These ledges can trap the master cone before it reaches the true working length, leading to inaccurate obturation and potential complications.
While d. None of the above might be tempting if none of the options seem individually definitive, the combination of dentin debris and ledge formation is a very common reason for this particular issue.
Other Possibilities:
Other possibilities, though less likely, include:
- Canal taper mismatch:
If the master cone taper doesn't match the prepared canal taper, it may not fit snugly and could get stuck short of the working length.
- Improper Gutta-percha consistency:
Gutta-percha that is too warm or too cold could have altered flow properties, potentially hindering its placement at the desired depth.
- Mismeasurement of working length:
It's important to ensure accurate working length determination using reliable methods to avoid potential discrepancies.
Therefore, in most cases, a combination of dentin debris and ledge formation (c) is the most likely culprit when the master cone fails to reach working length despite sharing the same size as the last file. Addressing these issues through thorough cleaning and careful canal preparation can help ensure proper gutta-percha placement and a successful endodontic treatment.
