Reciprocating Root Canal Technique Induces Greater Debris Accumulation Than a Continuous Rotary Technique as Assessed by 3-Dimensional Micro-Computed Tomography

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• 作者：Jonathan P. Robinson ; BSc (Hons) ; MSc^&lowast ; ; ^{j.p.robinson@pgr.bham.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; Philip J. Lumley ; BDS ; MDentSci ; PhD ; FDSRCPS^&Dagger ; ; Paul R. Cooper ; BSc ; PhD^&Dagger ; ; Liam M. Grover ; BMedSc (Hons) ; PhD^&dagger ; ; A. Damien Walmsley ; BDS ; MSc ; PhD ; FDSRCPS^&Dagger ;
• 关键词：Debris ; micro&ndash ; computed tomography ; reciprocate movement ; root canal preparation
• 刊名：Journal of Endodontics
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：39
• 期：8
• 页码：1067-1070
• 全文大小：278 K

文摘

The ability of single-file, reciprocating instruments to remove inorganic debris is uncertain. By using micro–computed tomography (microCT), this study compared the 3-dimensional distribution, quantity, and density of remaining inorganic debris in the mesial root of mandibular molars after instrumentation. A single reciprocating file was compared with a multifile rotary instrumentation technique.

Methods

Teeth were selected for instrumentation using reciprocating or rotary instruments (n = 19). Teeth were scanned using microCT before and after instrumentation. Through shape recognition and superimposition image analysis techniques, remaining inorganic tissue debris was identified, quantified, and visualized 3-dimensionally, mapping debris to its location. The use of a density phantom enabled the debris density to be calculated, giving a measure of compactness.

Results

After single-file instrumentation, an average of 19.5% debris remained in the canal compared with 10.6% with the multifile technique (P = .01) and at an average density of 1.60 g/m³ compared with 1.55 g/m³ for the multifile system (P > .05). Isthmuses, protrusions, and irregularities in the canal wall were repeatedly seen at the locations of debris accumulation.

Conclusions

In canals with a high prevalence of isthmuses and protrusions, using multifile rotary systems may be preferred over reciprocating files because it can yield cleaner canals with less debris accumulation.