Analysis of forces developed during obturations. Wedging effect: Part II

Area of Science:

• Endodontics
• Dental Materials Science
• Biomechanical Engineering

Background:

• Root canal obturation is crucial for endodontic success.
• Understanding the forces and wedging effects of different obturation techniques is essential for preventing root fractures.

Purpose of the Study:

• To compare the forces and wedging effects of four root canal obturation techniques: warm vertical compaction, lateral condensation, thermomechanical compaction, and Thermafil condensation.
• To analyze the impact of instrumentation, duration, and compaction load on these forces.
• To evaluate the influence of technique modifications and induced failures on wedging effects.

Main Methods:

• Utilized a modified Endographe force analyzer with a new cupule.
• Recorded force application sequences using graphs for each technique.
• Studied variations in technique, including spreader/plugger size and master cone size.
• Quantified mean wedging effects for each of the four obturation techniques.

Main Results:

• Mean wedging effects: Warm vertical compaction (0.65 ± 0.07 kg), Lateral condensation (0.8 ± 0.1 kg), Thermomechanical compaction (0.6 ± 0.08 kg), Thermafil condensation (0.03 ± 0.01 kg).
• Thermafil condensation exhibited a substantially lower wedging effect compared to the other techniques.
• Graphs provided a novel method for analyzing obturation technique forces.

Conclusions:

• Thermafil condensation appears to generate minimal wedging forces in the root canal.
• The force analyzer and graphical analysis offer a valuable new approach for evaluating endodontic obturation techniques.
• Further research may explore clinical implications of these findings on root integrity.