261 Removal efficacy of intracanal medication by different techniques and chemicals

Thursday, March 22, 2012: 2 p.m. - 3:15 p.m.
Presentation Type: Poster Session
C.H.R. CAMARGO1, P.G. MADUREIRA2, T.R. OLIVEIRA3, G.O. SILVA4, S.E.A. CAMARGO5, and M.C. VALERA2, 1Operative Dentistry and Endodontics, Universidade Est. Paulista Julio Mesquita, São José dos Campos, Brazil, 2UNESP, São José dos Campos, Brazil, 3Department of Endodontics, São Paulo State University, São José dos Campos, Brazil, 4Sao Paulo State University, São José dos Campos, Brazil, 5Bioscience and Buccal Diagnosis, Universidade Est. Paulista Julio Mesquita, São Jose dos Campos, Brazil
Objective: Efficacy removal of intracanal medication (IM) is always a challenge in Endodontics, for this reason the present study compared removal ability of calcium hydroxide in combination with 2% chlorhexidine gel using different techniques.

Method: Fifty human single-rooted teeth were prepared with rotary files to a master apical file #35 and the canals were completely filled with the IM. The samples were stored at 37 °C and 100% relative humidity for 15 days and the specimens were divided according to the intracanal medication removal: C control - saline solution (SS) + apical debridement (AD); NT - SS + EDTA 17% + AD + NavTip; US – ultrasound with distilled water + AD; FX - SS + EDTA 17% + AD + NavTipFX; CA - citric acid + AD. The roots were sectioned and the apical third was quantitatively evaluated in stereomicroscope and scanning electron microscope by percentage of calcium hydroxide residue.

Result: The removal of the IM was similar among the different groups and control; it was possible to observe, by stereomicroscope, small amounts of IM in all groups. However there was significant difference between FX and CA groups (p<0.05). Summarizing the results the percentiles of open tubules can be ranked in the following order from the least to the most: CA (15.49%) < US (31.93%) < C (34.73%) < NT (40.66 %) < FX (46.61%).

Conclusion: Concluding EDTA17% using NavTipFX was the best technique, however IM removal still needs more efforts to achieve a better root dentin cleaning.

This abstract is based on research that was funded entirely or partially by an outside source: FAPESP BRAZIL (PROCESS: 2009/54108-1)

Keywords: Calcium Hydroxide and Root canal fillings