Thermafil retreatment with and without chloroform solvent

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Previous research indicated Thermafil retreatment leaves more gutta-percha than lateral condensation.
• Effective retreatment is crucial for endodontic success.

Purpose of the Study:

• To evaluate two retreatment methods for Thermafil-obturated root canals.
• To assess the impact of solvent use and carrier removal ease on retreatment efficacy.

Main Methods:

• Thirty root canals were obturated with Thermafil. Group 1 was retreated with chloroform; Group 2 was retreated without.
• Ease of metal carrier removal was recorded.
• Teeth were split, and remaining gutta-percha was quantified in coronal, middle, and apical thirds.

Main Results:

• No significant difference in gutta-percha removal between groups when solvent use was the primary factor.
• Ease of carrier removal significantly influenced gutta-percha presence, particularly in the apical third.
• Easily removed carriers in Group 2 (no solvent) resulted in significantly less apical gutta-percha (5.9%) compared to difficult removals (54.2%).

Conclusions:

• The ease of Thermafil metal carrier removal is a more critical factor in retreatment success than the use of solvents like chloroform.
• Techniques facilitating easier carrier removal may lead to more adequate cleaning of Thermafil-obturated canals.