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Standardized technique for linear dye leakage studies: immediate versus delayed immersion times
B K Pollard1, R N Weller, J C Kulild
1United States Army Dental Activity, Fort Gordon, Georgia.
International Endodontic Journal
|September 1, 1990
Summary
This study found no significant difference in dye leakage into root canals obturated with gutta-percha, regardless of whether immersion in Indian ink occurred immediately or was delayed. This suggests timing does not impact the seal quality of gutta-percha root canal fillings.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Root canal obturation aims to create a hermetic seal to prevent bacterial ingress.
- Gutta-percha is a common root canal filling material, but its sealing ability can be influenced by various factors.
- Understanding the impact of obturation timing on leakage is crucial for clinical success.
Purpose of the Study:
- To compare the in vitro dye leakage into root canals obturated with gutta-percha.
- To evaluate the effect of immediate versus delayed immersion in Indian ink on leakage.
Main Methods:
- Sixty extracted human teeth with single canals were instrumented and obturated with gutta-percha and sealer.
- Teeth were divided into three groups and immersed in Indian ink immediately, 1 day, or 7 days post-obturation.
- Leakage was quantified after 7 days by rendering teeth transparent and measuring ink penetration using a stereomicroscope.
Main Results:
- Positive controls showed complete leakage, while negative controls exhibited no leakage.
- No statistically significant difference in linear ink penetration was found between the immediate, 1-day delayed, and 7-day delayed immersion groups.
- The timing of immersion did not affect the extent of dye leakage into the obturated root canals.
Conclusions:
- The timing of immersion in Indian ink does not significantly influence the extent of leakage into gutta-percha obturated root canals.
- This in vitro study suggests that the seal provided by gutta-percha obturation is not significantly compromised by delays in exposure to potential contaminants.