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Quality analysis of the preparation and retreatment of different instruments associated or not to different protocols agitation irrigant

Grant number: 16/19956-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2017
Effective date (End): April 30, 2019
Field of knowledge:Health Sciences - Dentistry - Endodontics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Clovis Monteiro Bramante
Grantee:Jussaro Alves Duque
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil


The chemical-mechanical preparation of the root canal is an important steps of endodontic treatment and it becomes challenging in cases of teeth with curvature. Therefore, it is important that the instrument used at this stage is able to perform an adequate preparation while maintaining the original trajectory of the root canal. However, even before an adequate chemical-mechanical preparation and a correct filling, failures may occur and the endodontic retreatment can be necessary. However, after the removal filling procedure, material still remains in the canal. Therefore, irrigation protocols are used after the root canal filling removal for additional cleaning. Thus, the aim of this study will be to evaluate by means of computed microtomography (microCT), the quality of preparation and retreatment in curved canals, carried out with recently introduced instruments: Reciproc Blue, Wave One Gold, Prodesign R and BT-Race. Also, evaluate, using computed microtomography and scanning electron microscopy (SEM), the efficiency in removing residual filling material and cleanless of the dentinal wall promoted by different irrigating agitation protocols: ultrasound, Easy Clean alternating rotation and Easy Clean in continuous rotation. For this, 48 premolars showing curvature between 15 and 30 ° will be selected for microCT and scanned with predefined parameters. Then the teeth will be divided into 4 groups (n = 12) and instrumented canals with the following instruments: G1 - Reciproc Blue 40.06, G2 - Wave One Gold 35.07, G3 - BT-Race and G4 - Prodesign R 35.05. A new scan with the same initials parameters will be carried out and so, the transport of the canal, volume and areas not touched by the instrument will be evaluated. Once this is done, the canals will be obturated with the thermoplastic technique System B and Obtura II and AH Plus cement and then performed a new scan. After this procedure, canals will be submitted to endodontic retreatment with the same systems used in chemical-mechanical preparation. After the retreatment, a new scan will be performed to then carry out a new retreatment procedure, however, with an additional instrument of higher caliber of each system, that are: G1 - Reciproc Blue 50.05, G2 - Wave One Gold 45.05, G3 - BT-Race 50.04 e G4 - Prodesgin Logic 50.01. After that, it will be evaluated the filling material removal capacity, effective time of removal procedure and volume of filling material extruded through the apical foramen. After this, the canals will be divided into 4 groups (n = 12) and the following final irrigation protocols will be applied: conventional irrigation, Easy Clean alternating rotation, Easy Clean in continuous rotation and passive ultrasonic irrigation. After this procedure, there will be a scan of the teeth and will be evaluated for filling material removal capacity. Next, the teeth will be sectioned londitudinally and the hemisections will be evaluated by SEM, where the cleanless of the dentinal tubules will be observed. To determine the appropriate statistical test, the data obtained in each analysis will be submitted to D'Agostino normality test and Pearson, with the significance level of 5%. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RODRIGO RICCI VIVAN; VANESSA ABREU SANCHES MARQUES COSTA; LETICIA CITELLI CONTI; JUSSARO ALVES DUQUE; CLOVIS MONTEIRO BRAMANTE; MARCUS VINICIUS REIS SÓ; MURILO PRIORI ALCALDE; MARCO ANTONIO HUNGARO DUARTE. Effect of nickel-titanium alloys on root canal preparation and on mechanical properties of rotary instruments. Brazilian Oral Research, v. 36, . (16/19956-5)
DUQUE, J. A.; VIVAN, R. R.; DUARTE, M. A. H.; ALCALDE, M. P.; CRUZ, V. M.; BORGES, M. M. B.; BRAMANTE, C. M.. Effect of larger apical size on the quality of preparation in curved canals using reciprocating instruments with different heat thermal treatments. International Endodontic Journal, v. 52, n. 11, p. 1652-1659, . (16/19956-5)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
DUQUE, Jussaro Alves. Analysis of the quality of root canal preparation and retreatment using different instruments associated or not with different irrigant agitation protocols. 2019. Doctoral Thesis - Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB) Bauru.

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