PDF icon Download PDF
Open Access
CC BY-NC-ND 4.0 · Eur J Dent 2019; 13(03): 335-342
DOI: 10.1055/s-0039-1697557
Original Article
Dental Investigation Society

Effect of Bleaching and Ca(OH)2 Dressing on the Bond Strength of Fiberglass Posts to Root Dentine

Iane Souza Nery-Silva
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
,
Gabriela Rover
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
,
Maybell Tedesco
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
,
Lucas da Fonseca Roberti Garcia
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
,
Eduardo Antunes Bortoluzzi
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
,
Ana Maria Hecke Alves
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
,
Cleonice Silveira Teixeira
1   Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
› Author Affiliations
Funding The present study was supported in part by the Coordination of Training of Higher Education Graduates (CAPES).
Further Information

Publication History

Publication Date:
16 October 2019 (online)

Also available ateRef
  Permissions and Reprints
Preview

Abstract

Objective The purpose of this study was to evaluate the effect of the intracoronary bleaching and calcium hydroxide (Ca(OH)2) dressing use, on the bond strength (BS) of fiberglass posts to root dentine.

Materials and Methods After root canal filling of 40 bovine incisors, a 2-mm thick cervical plug was fabricated 2 mm below the cementum–enamel junction. Seven days later, teeth were randomly distributed into four groups (n = 10), as follows: G1 no bleaching, followed by immediate post cementation; G2 bleaching and immediate post cementation; G3 bleaching, dressing with Ca(OH)2 for 7 days, and post cementation; and G4 bleaching, no dressing, and post cementation after 7 days. The roots were transversally cut into 1-mm thick slices to perform the push-out test (0.5 mm/min). Failure modes were assessed under scanning electron microscopy.

Statistical Analysis The analysis of variance (two-way ANOVA) was performed, followed by the supplementary Tukey multiple comparison test (a = 5%).

Results No significant difference for BS was observed among groups. Considering the different root thirds, G1 had higher BS values for the cervical third in comparison with the apical one (p < 0.05). The most frequent failure modes were adhesive between cement/dentine (G1); cohesive at the post (G2 and G3), and mixed (G4).

Conclusions The BS of the fiberglass posts to root dentine was not affected by the intracoronary bleaching and the use of Ca(OH)2 dressing.

Keywords

bond strength - calcium hydroxide - fiberglass posts - intracoronary bleaching