ORIGINAL ARTICLE   

Minerva Stomatologica 2017 February;66(1):20-7

DOI: 10.23736/S0026-4970.17.03969-3

Copyright © 2016 EDIZIONI MINERVA MEDICA

lingua: Inglese

Evaluation of in vitro push-out bond strengths of different post-luting systems after artificial aging

Luca MARIGO ¹, Camillo D’ARCANGELO ², Francesco DE ANGELIS ², Massimo CORDARO ³, Mirco VADINI ², Carlo LAJOLO ⁴ ✉

¹ Department of Operative Dentistry, School of Dentistry, “Sacro Cuore” Catholic University, Rome, Italy; ² Department of Operative Dentistry, University of Chieti, School of Dentistry, Chieti, Italy; ³ Department of Pediatric Dentistry, School of Dentistry, “Sacro Cuore” Catholic University, Rome, Italy; ⁴ Department of Oral Pathology, School of Dentistry, “Sacro Cuore” Catholic University, Rome, Italy

BACKGROUND: The purpose of this study was to evaluate the push-out bond strengths of four commercially available adhesive luting systems (two self-adhesive and two etch-and-rinse systems) after mechanical aging.
METHODS: Forty single-rooted anterior teeth were divided into four groups according to the luting cement system used: Cement-One (Group 1); One-Q-adhesive Bond + Axia Core Dual (Group 2); SmartCem® 2 (Group 3); and XP Bond® + Core-X™ Flow (Group 4). Anatomical Post was cemented in groups 1 and 2, and D.T. Light-Post Illusion was cemented in groups 3 and 4. All samples were subjected to masticatory stress simulation consisting of 300,000 cycles applied with a computer-controlled chewing simulator. Push-out bond strength values (MPa) were calculated at cervical, middle, and apical each level, and the total bond strengths were calculated as the averages of the three levels. Statistical analysis was performed with data analysis software and significance was set at P<0.05.
RESULTS: Statistically significant differences in total bond strength were detected between the cements (Group 4: 3.28 MPa, Group 1: 2.77 MPa, Group 2: 2.36 MPa, Group 3: 1.13 MPa; P<0.05). Specifically, Group 1 exhibited a lower bond strength in the apical zone, Group 3 exhibited a higher strength in this zone, and groups 2 and 4 exhibited more homogeneous bonding strengths across the different anatomical zones.
CONCLUSIONS: After artificial aging, etch-and-rinse luting systems exhibited more homogeneous bond strengths; nevertheless, Cement-One exhibited a total bond strength second only to Core-X Flow.

KEY WORDS: Dental prosthesis - Adhesives - Dental cement