Int Endod J JUNE 2011 - Efficacy of several techniques for the removal of calcium hydroxide medicament from root canals

Efficacy of several techniques for the removal of calcium hydroxide medicament from root canals

T. Tas ̧demir1, D. C ̧ elik1, K. Er1, T. Yildirim2, K. T. Ceyhanli1 & C. Yes ̧ ilyurt2

1Departments of Endodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey; and 2Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey

Abstract

Aim

To compare the efficacy of several techniques for the removal of calcium hydroxide (Ca(OH)2) from root canals. 

Methodology 

The root canals of 24 freshly extracted human mandibular premolars were prepared with ProTaper rotary instruments. The teeth were sectioned longitudinally along the length of the instru- mented canals. The roots were subsequently reassem- bled with wires. After Ca(OH)2 was placed into the canals, four techniques were used for its removal. In Group I, the teeth were irrigated with 5 mL of 2.5% NaOCl. Group II was treated in the same manner as Group I, but 5 mL of 17% EDTA was used in addition to NaOCl. In Group III, the teeth were irrigated with 5 mL of 2.5% NaOCl and agitated by an ultrasonic unit. In Group IV, the teeth were irrigated with 5 mL of 2.5% NaOCl and a CanalBrush was used to remove the Ca(OH)2. The roots were disassembled and digital photographs were taken. Measurements of residual Ca(OH)2 were performed as percentages of the overall canal surface area. The data was analysed with one- way ANOVA with post hoc Tukey test.

Results 

Significantly less residual material was obtained with a CanalBrush and passive ultrasonic agitation of NaOCl than the other groups (P < 0.05). There was no significant difference between syringe delivery of NaOCl and NaOCl + EDTA (P > 0.05). 

Conclusions 

None of the techniques removed the Ca(OH)2 dressing completely. CanalBrush and ultra- sonic agitation of NaOCl were significantly more effective than irrigant-only techniques.

Keywords: calcium hydroxide removal, CanalBrush, passive ultrasonic agitation, root canal.

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