期刊
JOURNAL OF ENDODONTICS
卷 36, 期 4, 页码 745-750出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.joen.2009.11.022
关键词
Debris; irrigation; root canal; side-venting syringe delivery; smear layer; vapor lock
资金
- NIDCR NIH HHS [R21 DE019213-01A1, R21 DE019213-01, R21 DE019213] Funding Source: Medline
- NATIONAL INSTITUTE OF DENTAL &CRANIOFACIAL RESEARCH [R21DE019213] Funding Source: NIH RePORTER
Introduction: This study examined the effect of vapor lock on canal debridement efficacy by testing the null hypothesis that there is no difference between a closed and an open system design in smear layer and debris removal by using a side-vented needle for irrigant delivery. Methods: Roots in the closed system were sealed with hot glue and embedded in polyvinylsiloxane to restrict fluid flow through the apical foramen during cleaning and shaping. For the open system, the apical foramen was enlarged and connected to the external environment via a channel within the polyvinylsiloxane to permit unrestricted fluid flow. Smear and debris scores were evaluated by using scanning electron microscopy and analyzed by using Cochran-Mantel-Haenszel statistic. Results: No difference in smear scores was detected between the 2 systems at all canal levels. Significant differences in debris scores between the 2 systems were found at each canal level: coronal (P < .001), middle (P < .001), and apical (P < .001). Conclusions: The null hypothesis was rejected; presence of an apical vapor lock effect adversely affects debridement efficacy. Thus, studies with unspecified or questionable mechanisms to restrict fluid flow through the apical foramen have to be interpreted with caution. (J Endod 2010;36:745-750)
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