Comparative Three-Dimensional Analysis of Three Different Root Canal Obturation Techniques: An In Vitro Study

Area of Science:

• Endodontics
• Dental Materials Science
• Radiology

Background:

• Successful root canal treatment relies on effective debridement, shaping, and obturation for a hermetic seal against microbial re-infection.
• Popular obturation techniques include single-cone, warm vertical compaction, and thermoplasticized gutta-percha.
• Traditional 2D radiography for assessing obturation has limitations like image distortion and superimposition.

Purpose of the Study:

• To compare the efficacy of three root canal obturation techniques: single-cone, warm vertical compaction, and thermoplasticized gutta-percha.
• To evaluate adaptation, voids, and density using cone beam computed tomography (CBCT) in different root canal thirds.
• To provide data aiding clinicians in achieving long-term success in root canal therapies.

Main Methods:

• An in vitro study using 72 extracted human premolars with single canals.
• Canals were instrumented and obturated using either single-cone, warm vertical compaction, or thermoplasticized gutta-percha (n=24 per group).
• Specimens were scanned using CBCT and analyzed by two blinded observers for voids, adaptation, and density in apical, middle, and coronal thirds. Data analyzed using ANOVA and Bonferroni tests.

Main Results:

• The thermoplasticized technique demonstrated superior performance with 100%, 75%, and 75% void-free cases in the apical, middle, and coronal thirds, respectively.
• Warm vertical compaction showed moderate results with 75% to 62.5% void-free cases.
• The single-cone technique exhibited the highest void formation, with 50% to 37.5% void-free cases. Significant differences were found between techniques (p=0.00).

Conclusions:

• The thermoplasticized gutta-percha technique yielded the most consistent results with minimal voids, proving most effective.
• This technique is superior to single-cone and warm vertical compaction for root canal obturation.
• CBCT is a valuable tool for assessing the efficacy of endodontic obturation techniques.