Resistance to obturation removal carried out with two fillings techniques, reviewed by push-out test

• Grant number: 11/22783-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2012
• End date: May 31, 2013
• Field of knowledge: Health Sciences - Dentistry - Endodontics
• Principal Investigator: Idomeo Bonetti Filho
• Grantee: Priscila Amanda Francisco
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

The aim of this study will be to compare the resistance to filling removal carried out with single cone (simple) and lateral condensation (complex) obscuration techniques by push-out test, of the apical, middle and cervical canal radicular thirds, checking whether the modification of the obscuration technique may alter the adhesiveness of the sealer. Will be used single-rooted human teeth, which will be instrumented by ProTaper Universal system, until the instrument F5, as memory, being fifteen filled by the single cone technique and fifteen by lateral condensation technique. In both techniques, the AH Plus cement will be used. For single cone filling, will be used gutta-percha F5 cone encased in cement and condensed vertically. For the lateral condensation technique will be used a gutta-percha # 50 cone encased in cement, with the aid of digital spacers B e C will be placed auxiliary gutta-percha FF and FM, respectively, and condensed vertically. Then will be made 2 mm thickness discs, in the apical, middle and cervical portions. Each disc will be placed in a mechanical testing machine to obtain the test results of push-out. The limit of resistance will be shown by the displacement or extrusion of the obscuration of the root portion. Data will be stored and submitted to statistical analysis by ANOVA parametric test and complemented by the Tukey test, with significance level of 5%. After the mechanical test, the discs will be examined under a stereomicroscope, with an increase of 20X, to evaluate the fracture pattern. In the analysis of fracture pattern will be used the Kruskal-Wallis test complemented by Dunn test. (p = 0.05).(AU)