Periapical Microsurgery: Do Root Canal-retreated Teeth Have More Dentinal Defects?

Area of Science:

• Endodontics
• Microsurgery
• Dental Anatomy

Background:

• Assessing dentinal defects in endodontically treated teeth is crucial for understanding treatment outcomes.
• Previous studies have not definitively compared dentinal defect prevalence between primary root canal treatments and retreatments.

Purpose of the Study:

• To evaluate the association between endodontic retreatment and the presence of dentinal defects.
• To compare the incidence of dentinal defects in teeth undergoing primary root canal treatment versus retreatment.

Main Methods:

• A microsurgical clinical study involving 155 patients undergoing periapical microsurgery.
• Root ends were inspected for dentinal defects using a surgical operating microscope, probe light, and methylene blue dye.
• Root canal treatment history (primary vs. retreatment) was documented and analyzed using chi-square and logistic regression.

Main Results:

• Of 122 included teeth, 73 had primary root canal treatment and 49 had retreatment.
• Dentinal defects were found in 22.5% of primary treatment teeth versus 64.7% of retreatment teeth.
• The higher proportion of defects in retreated teeth was statistically significant (P < .001), with treatment type being the only significant factor in multivariate analysis.

Conclusions:

• Teeth that have undergone endodontic retreatment exhibit a significantly higher prevalence of dentinal defects.
• The findings indicate a strong association between root canal retreatment and increased dentinal defects, independent of patient age, sex, or tooth location.