6533b828fe1ef96bd1287b2e

RESEARCH PRODUCT

Bond strength of cemented fiber posts to teeth with simulated internal root resorption

subject

description

Made available in DSpace on 2021-06-25T10:58:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-03-01 Background: Teeth with internal root resorption (IRR) have guarded prognosis, considering that IRR defect could influence on the post bond strength. The aim of this study was to evaluate the bond strength and the bond interface between different glass fiber-reinforced posts (FRP) after cementation in teeth with simulated internal root resorption (IRR). Material and Methods: Forty-five (45) human premolar roots with simulated IRR were embedded in acrylic resin blocks and cross-sectioned into two segments, enabling them to be re-approximated by screws. Intracanal medication was inserted for 15-days, removed by passive ultrasonic irrigation (PUI) and examined by stereomicroscopy. The push-out bond strength of two fiber reinforced composite posts (Rebilda Post - RP) and Rebilda Post GT - GT, (VOCO) were evaluated at the cervical and IRR regions (n = 20). And, the bonded interface between resin cement and root dentine was analysed by scanning electron microscopy (SEM). Results: 62.5% of IRR were not completely cleaned by PUI. Bond strength values at the cervical region (9.8 and 14.6 MPa) were higher than the IRR region (6.3 and 4.2 MPa). Micrographies showed bubbles in the cement and spaces in the bonded interface. Conclusions: RP post showed better bond strength at the cervical region while GT had better bond strength at the IRR region. São Paulo State University (Unesp) Department of Dental Materials and Prosthodontics Department of Restorative Dentistry, 777 Eng. Francisco José Longo Avenue. São José dos Campos São Paulo State University (Unesp) Department of Dental Materials and Prosthodontics Department of Restorative Dentistry, 777 Eng. Francisco José Longo Avenue. São José dos Campos