(PR011) A Prospective Randomized Controlled Trial on Orthograde MTA Obturation: Healing Outcomes Over 1 Year Follow-Up

Objective: This randomized clinical trial investigated the clinical outcomes of endodontically treated tooth with root canals obturated with orthograde MTA obturation or continuous wave of condensation technique and the related prognostic factors.

Methods: Single or 2-rooted teeth (n=120) that required primary or secondary/persistent endodontic treatment (PAI scores: 3-5) were enrolled and randomly allocated to the two obturation groups: Group M (n=60), root canals were obturated with OrthoMTA III (BioMTA, Seoul, Korea) in orthograde manner; Group C (n=60), continuous wave of condensation technique using gutta-percha and AH Plus sealer. Treatment outcome over 1-year was assessed based on the clinical and radiographic records as healed/healing (success) or non-healed (failure), and associated with potential prognostic factors by Pearson chi-squared test and logistic regression (p < 0.05).

Results: A total of 84 teeth were followed up for at least 1 year (12~24 months, age: 55.5±17.6 yrs) and included for analysis. There were no significant differences in treatment outcomes between the two groups (group M, 86.1%; group C, 85.4%) (p>0.05). Teeth presented preoperative swelling and large periapical lesion (>7 mm) showed a significantly higher chance of failure (p < 0.05). An unfavorable treatment outcome of teeth in group M was significantly associated with the master apical size of the root canal smaller than ISO #45 (p < 0.05).

Conclusions: There were no significant differences in the clinical and radiographic outcomes between the 2 obturation techniques. Further studies are needed to establish the attributing factors for successful treatment outcomes in long-term perspectives.