Document Detail

Influence of reduced air pressure methods on dye penetration in standardized voids.
MedLine Citation:
PMID:  17234550     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The objective of this study was to evaluate the influence of the moment when reduced pressure is applied on dye penetration patterns. STUDY DESIGN: Nine hundred and sixty glass capillary tubes of different inner diameter (0.3 mm and 0.8 mm), divided into 48 groups, were submerged into dye in 3 different positions (horizontally, opening upwards, and opening downwards) under different vacuum conditions (passive, 5 kPa, 35 kPa, 70 kPa reduced pressure). When reduced pressure was applied half of the groups were submerged into dye before and half of the groups after the application of reduced pressure. Linear dye penetration was measured. Univariate analysis was performed with Mann-Whitney U test and Kruskal-Wallis test to select variables to be included in the regression model. A multiple logistic regression analysis with backward elimination was performed to assess the influence of different covariates on linear dye penetration. RESULTS: The multivariate linear regression showed that the moment of vacuuming had the greatest positive effect on linear dye penetration value (beta = 10.6, P < .0001). Also the level of pressure reduction had a positive effect on the outcome variable (beta = 0.2, P < .0001) while the vertical positioning of the tubes has negatively affected the outcome variable both for the open end upside (beta = -1.01, P = .024) and the open end downside (beta = -1.05, P = .019). Diameter of the tubes (P = .442) and immersion time (P = .727) had no effect on the outcome of linear dye penetration. CONCLUSIONS: Even minimum air pressure reduction applied before immersion of the specimens allowed the dye to extensively penetrate the voids.
Gianluca Plotino; Nicola M Grande; Nicola Manzulli; Giacomina Chiaradia; Giuseppe La Torre; Francesco Somma
Publication Detail:
Type:  Journal Article; Validation Studies     Date:  2006-09-26
Journal Detail:
Title:  Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics     Volume:  103     ISSN:  1528-395X     ISO Abbreviation:  Oral Surg Oral Med Oral Pathol Oral Radiol Endod     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-19     Completed Date:  2007-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9508562     Medline TA:  Oral Surg Oral Med Oral Pathol Oral Radiol Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  289-94     Citation Subset:  D; IM    
Department of Endodontics, Catholic University of Sacred Heart, Rome, Italy.
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MeSH Terms
Air Pressure
Coloring Agents / diagnostic use*
Dental Leakage / diagnosis*
Regression Analysis
Statistics, Nonparametric
Reg. No./Substance:
0/Coloring Agents

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