Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effects of canal enlargement and irrigation needle depth on the cleaning of the root canal system at 3 mm from the apex

근관확대 및 세척 주사바늘의 근관 내 위치가 치근단 3 mm 부위의 근관 세정에 미치는 영향

  • Moon, Ho-Jin (Biomaterials & Tissue Engineering Lab., Dankook University) ;
  • Hong, Chan-Ui (Department of Conservative Dentistry, Plant Dental Hospital)
  • 문호진 (단국대학교 조직재생공학 연구소) ;
  • 홍찬의 (플란트치과병원 치과보존과)
  • Received : 2011.12.09
  • Accepted : 2011.01.19
  • Published : 2012.03.01
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Abstract

Objectives: The aim of this study was to test the hypothesis, that the effectiveness of irrigation in removing smear layer in the apical third of root canal system is dependent on the depth of placement of the irrigation needle into the root canal and the enlargement size of the canal. Materials and Methods: Eighty sound human lower incisors were divided into eight groups according to the enlargement size (#25, #30, #35 and #40) and the needle penetration depth (3 mm from working length, WL-3 mm and 9 mm from working length, WL-9 mm). Each canal was enlarged to working length with Profile.06 Rotary Ni-Ti files and irrigated with 5.25% NaOCl. Then, each canal received a final irrigation with 3 mL of 3% EDTA for 4 min, followed by 5 mL of 5.25% NaOCl at different level (WL-3 mm and WL-9 mm) from working length. Each specimen was prepared for the scanning electron microscope (SEM). Photographs of the 3mm area from the apical constriction of each canal with a magnification of ${\times}250$, ${\times}500$, ${\times}1,000$, ${\times}2,500$ were taken for the final evaluation. Results: Removal of smear layer in WL-3 mm group showed a significantly different effect when the canal was enlarged to larger than #30. There was a significant difference in removing apical smear layer between the needle penetration depth of WL-3 mm and WL-9 mm. Conclusions: Removal of smear layer from the apical portion of root canals was effectively accomplished with apical instrumentation to #35/40 06 taper file and 3 mm needle penetration from the working length.

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References

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