Influence of root dentin treatment on the push-out bond strength of fibre-reinforced posts
Braz. oral res. (Online)
;
31: e29, 2017. tab, graf
Article
in English
| LILACS
| ID: biblio-839514
ABSTRACT
Abstract This study evaluates the influence of root dentin treatment with NaOCl alone and combined with EDTA, with and without ultrasound activation, on the push-out bond strength (BS) of fiber-reinforced posts in weakened roots, cemented with RelyX or Panavia. The root canals of 42 maxillary canines were instrumented with Reciproc and 2.5% NaOCl. In the coronal 12mm of all canals, experimental weakening of the roots was produced by reducing dentin thickness with 2.44mm diameter diamond burs. The roots were assigned to 3 groups (n = 14) according to root dentin treatment 2.5% NaOCl; 2.5% NaOCl + 17% EDTA; and 2.5% NaOCl + 17% EDTA, with solutions agitated using passive ultrasonic irrigation. After cementation of the fiber-reinforced posts the roots were divided in thirds. The first slice of each third was used for the push-out BS test, the second slice for confocal laser scanning microscopy and dentin microhardness (Knoop) analysis. Data were analysed by a two-way ANOVA and Tukey test (a = 0.05). NaOCl + EDTA provided highest BS values than NaOCl (p < 0.0001). Specimens cemented with Panavia presented significantly higher BS than those with RelyX in the three root thirds (p < 0.0001). The highest BS values occurred in the cervical third (p < 0.001). Ultrasound-activated NaOCl + EDTA promoted the greatest reduction in dentin microhardness, followed by NaOCl/EDTA and NaOCl. Ultrasonic activation of NaOCl and EDTA reduced root dentin microhardness, but did not improve the push-out BS of resin-based cements. Panavia presented higher BS than RelyX. RelyX was not influenced by the root dentin treatment protocols.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Sodium Hypochlorite
/
Tooth Root
/
Dental Bonding
/
Edetic Acid
/
Resin Cements
/
Dentin
Type of study:
Controlled clinical trial
/
Evaluation studies
/
Practice guideline
Limits:
Humans
Language:
English
Journal:
Braz. oral res. (Online)
Journal subject:
Dentistry
Year:
2017
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual de Montes Claros/BR
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