Removal of Debris and Smear Layer in Curved Root Canals Using Self-Adjusting File with Different Operation Times – A Scanning Electron Microscope Study

S. Yiğit-Özer, Ö. Adigüzel, and S. Kaya

International Dental Research. 2011 February; 1:1-6.


INTRODUCTION: Debridement during root canal treatment is mandatory and it is provided by means of chemo-mechanical instrumentation and irrigation methods. This article analysis the debridement capacity of a novel system, SAF and its special irrigation device when used with different operation times in curved root canals.

METHODS: 30 mesiobuccal root canals of maxillary molars were instrumented using SAF. Teeth were divided into three groups. In Group 1, 10 new SAF files were used for operation for 4 minutes. In Group 2, the 4-min previously used SAF files were operated in the same manner. In Group 3, the 8-min previously used SAF files were operated. During SAF operation 2.6 % NaOCl and 17 % EDTA were used alternately in all groups. Debris and smear layer removal were evaluated for the apical thirds under scanning electron microscope.

RESULTS: Non-used, 4-min pre-used and 8-min pre-used SAF efficiently removed debris and smear layer in the apical thirds. There were no significant differences among the groups in terms of debridement.

CONCLUSIONS: When SAF is operated in curved root canals with continuous flow of irrigation it results in debris and smear-free canal walls in the critical apical thirds within 12 minutes.


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yigit ozer saf debris


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